CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

Transcription

1 CHMOS PROGRMMLE PERIPHERL INTERFCE TECHNICL DT IN2C55 The Integral IN2C55N is a high-performance, CHMOS version of the industry standard IN2C55N general purpose programmable I/O device which is designed for use with all Intel and most other microprocessors. It provides 2 I/O pins which may be individually programmed in 2 groups of 12 and used in 3 major modes of operation. In MODE 0, each group of 12 I/O pins may be programmed in sets of and to be inputs or outputs. In MODE 1, each group may be programmed to have lines of input or output. 3 of the remaining pins are used for handshaking and interrupt control signals. MODE 2 is a strobed bidirectional bus configuration. FETURES Compatible with all Intel and Most Other Microprocessors High Speed, «Zero Wait State» Operation with MHz 06/ and 016/1 2 Programmable I/O Pins Low Power CHMOS Completely TTL Compatible Control Word Read-ack Capability Direct it Set/Reset Capability 2.5m DC Drive Capability on all I/O Port Outputs vailable in 0-Pin DIP vailable in EXPRESS Standard Temperature Range Extended Temperature Range D 7-D 0 Reset 1 0 CS DT US UFFER RED/ ITE CONTROL LOGIC CONTROL CONTROL IT INTERNL DT US PORT () PORT C UPPER () PORT C LOWER () PORT () P 7-P 0 PC 7-PC PC3-PC0 P 7-P 0 P 3 P 2 P 1 P 0 CS V SS 1 0 PC 7 PC 6 PC 5 PC PC 0 PC 1 PC 2 PC 3 P 0 P 1 P P P 5 P 6 P 7 Reset D 0 D 1 D 2 D 3 D D 5 D 6 D 7 V CC P 7 P 6 P 5 P P 3 Figure 1 Figure 2

2 IN2C55 Symbol Pin Type Name and Function number P I/O PORT, PINS 0-3: Lower nibble of an -bit data output latch buffer and an -bit data input latch. 5 I RED CONTROL: This input is low during CPU read operations. CS 6 I CHIP SELECT: low on this input enables the 2C55 to respond to and signals and are ignored otherwise. GND 7 System Ground I DDRESS: These input signals in conjunction and control the selection of one of the three ports or the control word registers. 1 0 CS Input Operation (Read) Port - Data us Port - Data us Port C - Data us Control Word - Data us Output Operation (Write) Data us - Port Data us - Port Data us - Port C Data us Control Disable Function x x x x 1 Data us-3-state x x Data us-3-state PC I/O PORT C, PINS -7: Upper nibble of an -bit data output latch/buffer and an -bit data input buffer (no latch for input). This port can be divided into two -bit ports under the mode control. Each -bit port contains a -bit latch and it can be used for the control signal outputs and status signal inputs in conjunction with ports and. PC I/O PORT C, PINS 0-3: Lower nibble of Port C. P I/O PORT, PINS 0-7: n -bit data output latch/buffer and an -bit data input buffer VCC 26 SYSTEM POWER: +5V Power Supply D I/O DT US: i-directional, tri-state data bus lines, connected to system data bus RESET 35 I RESET: high on this input clears the control register and all ports are set to the input mode 36 I ITE CONTROL: This input is low during CPU write operations P I/O PORT PINS -7: Upper nibble of an -bit data output latch/buffer and an -bit data input latch

3 IN2C55 IN2C55N FUNCTIONL DESCRIPTION General The IN2C55N is a programmable peripheral interface device designed for use in Intel microcomputer systems. Its function is that of a general purpose I/O component to interface peripheral equipment to the microcomputer system bus. The functional configuration of the IN2C55N is programmed by the system software so that normally no external logic is necessary to interface peripheral devices or structures. Data us uffer This 3-state bidirectional -bit buffer is used to interface the IN2C55N to the system data bus. Data is transmitted or received by the buffer upon execution of input or output instructions by the CPU. Control words and status information are also transferred through the data bus buffer. Read/Write and Control Logic The function of this block is to manage all of the internal and external transfers of both Data and Control or Status words. It accepts inputs from the CPU ddress and Control busses and in turn, issues commands to both of the Control Groups. Group and Group Controls The functional configuration of each port is programmed by the systems software. In essence, the CPU outputs a control word to the IN2C55N. The control word contains information such as mode, bit set, bit reset, etc., that initializes the functional configuration of the 2C55. Each of the Control blocks (Group and Group ) accepts commands from the Read/Write Control Logic, receives control words from the internal data bus and issues the proper commands to its associated ports. Control Group - Port and Port C upper (C7 - C) Control Group - Port and Port C lower (C3 - C0) The control word register can be both written and read as shown in the address decode table in the pin descriptions. Figure 6 shows the control word format for both Read and Write operations. When the control word is read, bit D7 will always be a logic 1, as this implies control word mode information. Ports,, and C The IN2C55N contains three -bit ports (,, and C). ll can be configured in a wide variety of functional characteristics by the system software but each has its own special features or personality to further enhance the power and flexibility of the IN2C55N. Port. One -bit data output latch/buffer and one -bit input latch/buffer. oth pull-up and pull-down bus hold devices are present on Port. Port. One -bit data input/output latch/buffer. Only pull-up bus hold devices are present on Port. Port C. One -bit data output latch/buffer and one -bit data input buffer (no latch for input). This port can be divided into two -bit ports under the mode control. Each -bit port contains a -bit latch and it can be used for the control signal outputs and status signal inputs in conjunction with ports and. Only pull-up bus hold devices are present on Port C. See Figure for the bus-hold circuit configuration for Port,, and C.

4 IN2C55 CONTROL PORT () P 7-P 0 DT US UFFER IT INTERNL DT US PORT C UPPER () PORT C LOWER () PC 7-PC PC 3-PC 0 1 RED/ ITE CONTROL LOGIC CONTROL PORT () P 7-P 0 0 Reset CS Figure 3. IN2C55N lock Diagram Showing Data us uffer and Read Write Control Logic Functions RESET * INTERNL DT IN EXTERNL INTERNL PORT DT OUT PIN INTERNL DT OUT RESET P* VCC EXTERNL PORT,C PIN INTERNL DT OUT *NOTE: Port pins loaded with more than 20pF capacitance may not have their logic level guaranteed following a hardware reset. Figure. Port,, C, us-hold Configuration

5 IN2C55 IN2C55N OPERTIONL DESCRIPTION Mode Selection There are three basic modes of operation that can be selected by the system software: Mode 0 - asic input/output Mode 1 - Strobed Input/output Mode 2 - i-directional us When the reset input goes high all ports will be set to the input mode with all 2 port lines held at a logic one level by the internal bus hold devices (see Figure Note). fter the reset is removed the IN2C55N can remain in the input mode with no additional initialization required. This eliminates the need for pullup or pulldown devices in all CMOS designs. During the execution of the system program, any of the other modes may be selected by using a single output instruction. This allows a single IN2C55N to service a variety of peripheral devices with a simple software maintenance routine. The modes for Port and Port can be separately defined, while Port C is divided into two portions as required by the Port and Port definitions. ll of the output registers, including the status flip-flops, will be reset whenever the mode is changed. Modes may be combined so that their functional definition can be tailored to almost any I/O structure. For instance; Group can be programmed in Mode 0 to monitor simple switch closings or display computational results, Group could be programmed in Mode 1 to monitor a keyboard or tape reader on an interruptdriven basis. DRESS US CONTROL US DT US, D7-D0 0, 1 MODE 0 C P 7 -P 0 PC 7 -PC P 7 -P 0 MODE 1 C P 7 -P 0 CONTROL OR I/O CONTROL OR I/O P 7 -P 0 MODE 2 C P 7 -P 0 I/O CONTROL P 7 -P 0 Figure 5. asic Mode Definitions and us Interface

6 IN2C55 D 7 D 6 D 5 D D 3 D 2 D 1 D 0 PORT C (LOWER) 1 = INPUT 0 = OUTPUT PORT 1 = INPUT 0 = OUTPUT MODE SELECTION 0 = MODE 0 1 = MODE 1 PORT C (LOWER) 1 = INPUT 0 = OUTPUT PORT 1 = INPUT 0 = OUTPUT MODE SELECTION 00 = MODE 0 01 = MODE 1 1X = MODE 2 MODE SET FLG 1 = CTIVE Figure 6. Mode Definition Format The mode definitions and possible mode combinations may seem confusing at first but after a cursory review of the complete device operation a simple, logical I/O approach will surface. The design of the 2C55 has taken into account things such as efficient PC board layout, control signal definition vs PC layout and complete functional flexibility to support almost any peripheral device with no external logic. Such design represents the maximum use of the available pins. Single it Set/Reset Feature ny of the eight bits of Port C can be Set or Reset using a single OUTput instruction. This feature reduces software requirements in Control-based applications. When Port C is being used as status/control for Port or, these bits can be set or reset by using the it Set/Reset operation just as if they were data output ports. D 7 D 6 D 5 D D 3 D 2 D 1 D 0 DON T CRE IT SET/RESET 1 = SET 0 =RESET IT SELECT IT SET/RESET FLG 0 = CTIVE Figure 7. it Set/Reset Format

7 IN2C55 Interrupt Control Functions When the IN2C55N is programmed to operate in mode 1 or mode 2, control signals are provided that can be used as interrupt request inputs to the CPU. The interrupt request signals, generated from port C, can be inhibited or enabled by setting or resetting the associated INTE flip-flop, using the bit set/reset function of port C. This function allows the Programmer to disallow or allow a specific I/O device to interrupt the CPU without affecting any other device in the interrupt structure. INTE flip-flop definition: (IT-SET) - INTE is SET - Interrupt enable (IT-RESET) INTE is RESET - Interrupt disable Note: ll Mask flip-flops are automatically reset during mode selection and device Reset. Operating Modes Mode 0 (asic Input/Output). This functional configuration provides simple input and output operations for each of the three ports. No handshaking is required, data is simply written to or read from a specified port. Mode 0 asic Functional Definitions: Two -bit ports and two -bit ports. ny port can be input or output. Outputs are latched. Inputs are not latched. 16 different Input/Output configurations are possible in this Mode. MODE 0 (SIC INPUT) t RR t IR t HR INPUT t R t R CS, 1, 0 t t DF

8 IN2C55 MODE 0 (SIC OUTPUT) t WW t DW t WD t W t W CS,1,0 OUTPUT t W MODE 0 Port Definition D D3 D1 D0 PORT PORT C (UPPER) # PORT PORT C (LOWER) OUTPUT OUTPUT 0 OUTPUT OUTPUT OUTPUT OUTPUT 1 OUTPUT INPUT OUTPUT OUTPUT 2 INPUT OUTPUT OUTPUT OUTPUT 3 INPUT INPUT OUTPUT INPUT OUTPUT OUTPUT OUTPUT INPUT 5 OUTPUT INPUT OUTPUT INPUT 6 INPUT OUTPUT OUTPUT INPUT 7 INPUT INPUT INPUT OUTPUT OUTPUT OUTPUT INPUT OUTPUT 9 OUTPUT INPUT INPUT OUTPUT 10 INPUT OUTPUT INPUT OUTPUT 11 INPUT INPUT INPUT INPUT 12 OUTPUT OUTPUT INPUT INPUT 13 OUTPUT INPUT INPUT INPUT 1 INPUT OUTPUT INPUT INPUT 15 INPUT INPUT MODE 0 Configurations CONTROL WO #0 D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #1 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0

9 IN2C55 CONTROL WO #2 D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #3 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0 CONTROL WO # D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #5 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0 CONTROL WO #6 D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #7 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0 CONTROL WO # D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #9 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0

10 IN2C55 CONTROL WO #10 D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #11 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0 CONTROL WO #12 D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #13 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0 CONTROL WO #1 D 7 D 6 D 5 D D 3 D 2 D 1 D CONTROL WO #15 D 7 D 6 D 5 D D 3 D 2 D 1 D P 7 -P 0 P 7 -P 0 PC 7 -PC PC 7 -PC P 7 -P 0 P 7 -P 0 Operating Modes MODE 1 (Strobed Input/Output). This functional configuration provides a means for transferring I/O data to or from a specified port in conjunction with strobes or handshaking signals. In mode 1, Port and Port use the lines on Port C to generate or accept these handshaking signals. Mode 1 asic functional Definitions: Two Groups (Group and Group ). Each group contains one -bit data port and one -bit control/data port. The -bit data port can be either input or output oth inputs and outputs are latched. The -bit port is used for control and status of the

11 IN2C55 -bit data port. Input Control Signal Definition ST (Strobe Input). low on this input loads data into the input latch. IF (Input uffer Full F/F) high on this output indicates that the data has been loaded into the input latch; in essence, an acknowledgement. IF is set by ST input being low and is reset by the rising edge of the input. INTR (Interrupt Request) high on this output can be used to interrupt the CPU when an input device is requesting service. INTR is set by the ST is a one, IF is a one and INTE is a one. It is reset by the falling edge of. This procedure allows an input device to request service from the CPU by simply strobing its data into the port. INTE Controlled by bit set/reset of PC. INTE Controlled by bit set/reset of PC 2 MODE 1 (PORT ) P 7-P 0 CONTROL WO D 7 D 6 D 5 D D 3 D 2 D 1 D /0 X X X INTE PC ST PC 5 IF PC 6,7 1 = INPUT 0 = OUTPUT PC 3 INTR PC 6,7 2 MODE 1 (PORT ) P 7-P 0 CONTROL WO D 7 D 6 D 5 D D 3 D 2 D 1 D 0 1 X X X X 1 1 X INTE PC 2 ST PC 1 IF PC 0 INTR Figure. MODE 1 Input

12 IN2C55 t ST ST t SI IF t SIT t RI INTR t RIT t PH INPUT FROM PERIPHERL t PS Output Control Signal Definition Figure 9. MODE 1 (Strobed Input) OF (Output uffer Full F/F). The OF output will go low to indicate that the CPU has written data out to the specified port. The OF F/F will be set by the rising edge of the input and reset by CK Input being low. CK (cknowledge Input). low on this input informs the IN2C55N that the data from Port or Port has been accepted. In essence, a response from the peripheral device indicating that it has received the data output by the CPU. INTR (Interrupt Request). high on this output can be used to interrupt the CPU when an output device has accepted data transmitted by the CPU. INTR is set when CK is a one, OF is a one and INTE is a one. It is reset by the falling edge of. INTE Controlled by bit set/reset of PC 6. INTE Controlled by bit set/reset of PC 2. MODE 1 (PORT ) P7-P0 CONTROL WO D7 D6 D5 D D3 D2 D1 D /0 X X X INTE PC6 PC7 CK OF PC6,7 1 = INPUT 0 = OUTPUT PC3 INTR PC,5 2 MODE 1 (PORT ) P7-P0 CONTROL WO D7 D6 D5 D D3 D2 D1 D0 1 X X X X 1 0 X INTE PC2 PC1 CK OF PC0 INTR Figure 10. MODE 1 Output

13 IN2C55 OF to t WO INTR t WIT CK t K t IT OUTPUT t W Combinations of MODE 1 Figure 11. MODE 1 (Strobed Output) Port and Port can be individually defined as input or output in Mode 1 to support a wide variety of strobed I/O applications. CONTROL WO D7 D6 D5 D D3 D2 D1 D /0 1 0 X PC6,7 1 = INPUT 0 = OUTPUT P7-P0 PC PC5 PC3 PC6,7 2 ST IF INTR CONTROL WO D7 D6 D5 D D3 D2 D1 D /0 1 1 X PC,5 1 = INPUT 0 = OUTPUT P7-P0 PC7 PC6 PC3 PC,5 2 OF CK INTR P7-P0 PC1 OF P7-P0 PC2 ST PORT STROED INPUT PORT STROED OUTPUT PC2 PC0 CK INTR PORT STROED OUTPUT PORT STROED INPUT PC1 PC0 IF INTR Operating Modes Figure 12. Combinations of MODE 1 MODE 2 (Strobed idirectional us I/O).This functional configuration provides a means for communicating with a peripheral device or structure on a single -bit bus for both transmitting and receiving data (bidirectional bus I/O). Handshaking signals are provided to maintain proper bus flow discipline in a similar manner to MODE 1. Interrupt generation and enable/disable functions are also available. MODE 2 asic Functional Definitions: Used in Group only. One -bit, bi-directional bus port (Port ) and a 5- bit control port (Port C). oth inputs and outputs are latched. The 5-bit control port (Port C) is used for control and status for the -bit, bi-directional bus port (Port ).

14 IN2C55 idirectional us I/O Control Signal Definition INTR (Interrupt Request). high on this output can be used to interrupt the CPU for input or output operations. Output Operations OF (Output uffer Full). The OF output will go low to indicate that the CPU has written data out to port. CK (cknowledge). low on this input enables the tri-state output buffer of Port to send out the data. Otherwise, the output buffer will be in the high impedance state. INTE 1 (The INTE Flip-Flop ssociated with OF ). Controlled by bit set/reset of PC6. Input Operations ST (Strobe Input). low on this input loads data into the input latch. IF (Input uffer Full F/F). high on this output indicates that data has been loaded into the input latch. INTE 2 (The INTE Flip-Flop ssociated with IF). Controlled by bit set/reset of PC. CONTROL WO D 7 D 6 D 5 D D 3 D 2 D 1 D X X X 1/0 1/0 1/0 PC 3 P 7 -P 0 INTR PC INPUT 0 OUTPUT PORT 1 INPUT 0 OUTPUT INTE 1 PC 7 PC 6 OF CK 1 INPUT 0 OUTPUT INTE 2 PC PC 5 3 PC 2-0 ST IF Figure 13. MODE Control Word Figure 1. MODE 2

15 IN2C55 DT FROM CPU TO IN2C55N OF t O t WO INTR t K CK t ST ST t SI IF PERIPHERL US t PS t D t KD t PH t RI DT FROM PERIPHERL TO IN2C55N DT FROM IN2C55N TO PERIPHERL DT FROM IN2C55N TO 00 Figure 15. MODE 2 (idirectional) NOTE: ny sequence where occurs before CK, and ST occurs before is permissible. ( INTR = IF MSK ST + OF MSK CK )

16 IN2C55 PC3 INTR PC3 INTR CONTROL WO D7 D6 D5 D D3 D2 D1 D0 1 1 X X X 0 1 1/0 P7-P0 PC7 OF CONTROL WO D7 D6 D5 D D3 D2 D1 D0 1 1 X X X 0 0 1/0 P7-P0 PC7 OF PC6 CK PC6 CK MODE 2 ND MODE 0 (INPUT) PC2-0 1 = INPUT 0 = OUTPUT PC PC5 PC2-0 3 ST IF MODE 2 ND MODE 0 (OUTPUT) PC2-0 1 = INPUT 0 = OUTPUT PC PC5 PC2-0 3 ST IF P7-P0 P7-P0 PC3 INTR PC3 INTR CONTROL WO D7 D6 D5 D D3 D2 D1 D0 1 1 X X X 1 0 X P7-P0 PC7 OF CONTROL WO D7 D6 D5 D D3 D2 D1 D0 1 1 X X X 1 1 X P7-P0 PC7 OF PC6 CK PC6 CK PC ST PC ST PC5 IF PC5 IF MODE 2 ND MODE 1 (OUTPUT) P7-P0 PC1 OF MODE 2 ND MODE 1 (INPUT) P7-P0 PC1 ST PC2 CK PC2 IF PC0 INTR PC0 INTR Figure 16. MODE 1/ Combinations Mode Definition Summary MODE0 MODE1 MODE2 IN OUT IN OUT ONLY P 0 IN OUT IN OUT P 1 IN OUT IN OUT P 2 IN OUT IN OUT P 3 IN OUT IN OUT P IN OUT IN OUT P 5 IN OUT IN OUT P 6 IN OUT IN OUT P 7 IN OUT IN OUT P 0 IN OUT IN OUT - P 1 IN OUT IN OUT - P 2 IN OUT IN OUT - MODE 0 P 3 IN OUT IN OUT - OR P IN OUT IN OUT - MODE1 P 5 IN OUT IN OUT - ONLY P 6 IN OUT IN OUT - P 7 IN OUT IN OUT - INTR OF PC 0 IN OUT INTR PC 1 IN OUT IF I/0 I/O PC 2 IN OUT ST CK I/O PC 3 IN OUT INTR INTR INTR PC IN OUT ST I/O ST PC 5 IN OUT IF I/O IF PC 6 IN OUT I/O CK CK PC 7 IN OUT I/O OF OF

17 IN2C55 Special Mode Combination Considerations There are several combinations of modes possible. For any combination, some or all of the Port C lines are used for control or status. The remaining bits are either inputs or outputs as defined by a Set Mode command. During a read of Port C, the state of all the Port C lines, except the CK and ST lines, will be placed on the data bus. In place of the CK and ST line states, flag status will appear on the data bus in the PC2, PC, and PC 6 bit positions as illustrated by Figure 1. Through a Write Port C command, only the Port C pins programmed as outputs in a Mode 0 group can be written. No other pins can be affected by a Write Port C command, nor can the interrupt enable flags be accessed. To write to any Port C output programmed as an output in a Mode 1 group or to change an interrupt enable flag, the Set/Reset Port C it command must be used. With a Set/Reset Port C it command, any Port C line programmed as an output (including INTR, IF and OF ) can be written, or an interrupt enable flag can be either set or reset. Port C lines programmed as inputs, including CK and ST lines, associated with Port C are not affected by a Set/Reset Port C it command. Writing to the corresponding Port C bit positions of the CK and ST lines with the Set/Reset Port C it command will affect the Group and Group interrupt enable flags, as illustrated in Figure 1. Current Drive Capability ny output on Port, or C can sink or source 2.5m. This feature allows the IN2C55N to directly drive Darlington type drivers and high-voltage displays that require such sink or source current. Reading Port C Status In Mode 0, Port C transfers data to or from the peripheral device. When the IN2C55N is programmed to function in Modes 1 or 2, Port C generates or accepts hand-shaking signals with the peripheral device. Reading the contents of Port C allows the programmer to test or verify the status of each peripheral device and change the program flow accordingly. There is no special instruction to read the status information from Port C. normal read operation of Port C is executed to perform this function. INPUT CONFIGURTION D 7 D 6 D 5 D D 3 D 2 D 1 D 0 I/O I/O IF INTE INTR INTE IF INTR OUTPUT CONFIGURTION D 7 D 6 D 5 D D 3 D 2 D 1 D 0 OF INTE I/O I/O INTR INTE OF INTR Figure 17a. MODE 1 Status Word Format D 7 D 6 D 5 D D 3 D 2 D 1 D 0 OF INTE 1 IF INTE 2 INTR (Defined by mode 0 or mode 1 selektion) Figure 17b. MODE 2 Status Word Format

18 IN2C55 Interrupt Enable Flag Position lternate INTE PC 2 CK (Output Mode 1) or ST (Input Mode 1) INTE 2 PC ST (Input Mode 1 or Mode 2) INTE 1 PC 6 CK (Output Mode 1 or Mode 2) Figure 1. Interrupt Enable Flags in Modes 1 and 2 SOLUTE MXIMUM RTINGS* mbient Temperature Under ias 0 C to + 70 C Storage Temperature - 65 O C to O C Supply Voltage to +.0V Operating Voltage + V to + 7V Voltage on any Input GND-2V to + 6.5V Voltage on any Output GND-0.5V to V CC + 0.5V Power Dissipation 1Watt NOTICE: This is a production data sheet. The specifications are subject to change without notice. O *NING: Stressing the device beyond the bsolute Maximum Ratings may cause permanent damage. These are stress ratings only. Operation beyond the Operating Conditions is not recommended and extended exposure beyond the Operating Conditions may affect device reliability. D.C. CHRCTERISTICS O O T = 0 Cto70 C, V CC =+5V ±10%, GND = 0V (T =-0 O C to +5 O C for Extended Temperature) Symbol Parameter Min Max Units Test Conditions V IL Input Low Voltage V VIH Input High Voltage 2.0 VCC V V OL Output Low Voltage 0. V I OL = 2.5m V OH Output High Voltage 3.0 V I OH =-2.5m O V CC - 0. V I OH =-100μ I IL Input Leakage Current ±1 μ VIN = V CC to 0V (Note 1) IOFL Output Float Leakage ±10 μ IN = V CC to 0V (Note 2) Current IDR Darlington Drive Current ±2.5 (Note m Ports,,C ) Rext = 500Ω V ext = 1.7V IPHL Port Hold Low Leakage μ VOUT = 1.0V Current Port only IPHH Port Hold High Leakage μ VOUT = 3.0V Current Ports,,C IPHLO Port Hold Low Overdrive -350 μ V OUT = 0.V Current I PHHO Port Hold High Overdrive +350 μ V OUT = 3.0V Current I CC V CC Supply Current 10 m (Note 3) I V Supply Current-Standby 10 μ V = 5.5V CCS CC CC V IN = V or GND CC Port Conditions If I/P = Open/High O/P = Open Only With Data us = High/Low CS = High Reset = Low Pure Inputs = Low/High

19 IN2C55 NOTES: 1. Pins 1, 0, CS,,, Reset 2. Data us; Ports, C 3. Outputs open.. Limit output current to.0m. CPCITNCE O T = 25 C, V CC = GND = 0V Symbol Parameter Min Max Units TestConditions CIN Input Capacitance 10 pf Unmeasured pins C I/O Capacitance 20 pf returned to GND f 1MHz(5) NOTE: 5. Sampled not 100% tested. I/O C =.C. CHRCTERISTICS O O T = 0 to 70 C, V CC = +5V ±10%, GND = 0V O O T = -0 C to +5 C for Extended Temperature US PRMETERS RED CYCLE Symbol Parameter Min Max Units Test Conditions tr ddress Stable efore _ 0 ns tr ddress Hold Time fter _ 0 ns trr Pulse Width 150 ns t Data Delay from _ 120 ns tdf _ to Data Floating ns t Recovery Time between / 200 ns RV ITE CYCLE Symbol Parameter Min Max Units Test Conditions tw ddress Stable efore _ 0 ns tw ddress Hold Time fter _ 20 ns Ports 20 ns PortC t Pulse Width 100 ns WW t Data Setup Time efore _ 100 ns DW twd Data Hold Time fter _ 30 ns Ports 30 ns PortC

20 IN2C55 OTHER TIMINGS Symbol Parameter Min Max Units Test Conditions t W = 1 to Output 350 ns tlr Peripheral Data efore 0 ns thr Peripheral Data fter 0 ns t K CK Pulse Width 200 ns t ST ST Pulse Width 100 ns tps Per. Data efore ST High 20 ns tph Per. Data fter ST High 50 ns t D CK = 0 to Output 175 ns t KD CK = 1 to Output Float ns t WO = 1 to OF = ns t O CK = 0 to OF = ns t SI ST = 0 to IF = ns t RI = 1 to IF = ns t RIT = 0 to INTR = ns t SIT ST = 1 to INTR = ns t IT CK = 1 to INTR = ns t WIT = 0 to INTR = ns see note1 tres Reset Pulse Width 500 ns see note2 NOTE 1. INTR_ may occur as early as _. 2. Pulse width of initial Reset pulse after power on must be at least 50μSec. Subsequent Reset pulses may be 500ns minimum. The output Ports or C may glitch low during the reset pulse but all port pins will be held at a logic one level after the reset pulse. ITE TIMING 0-1,CS t W t W DT US t DW t WD t WW

21 IN2C55 RED TIMING 0-1,CS t R t R DT US HIGH IMPEDNCE VLID HIGH IMPEDNCE t t DR t RR.C. TESTING INPUT, OUTPUT WVEFORM.C. TESTING LOD CIRCUIT TEST POINTS C L =150pF.C. Testing Inputs re Driven t 2.V For Logic 1 nd 0.5V For Logic 0 Timing Measurements re Made t 2.0V For Logic 1 nd 0. For Logic 0..C. TESTING LOD CIRCUIT DEVICE UNDER TEST C L =150pF V EXT * *V EXT Is Set t Various Voltages During Testing To Guarantee The Specification. C L Includes Jig Capacitance.

22 IN2C55 0-Pin Plastic Dual-in-Line Dimension, mm max 6.35 ı min C D E E1 min 3.1 max.95 min 0.36 max 0.56 min 0.77 max 1.7 min 0.20 max 0.3 min max min 15.2 max 15.7 min max 1.73 e nom 2.5 e2 nom 15.2 L α min min º max max º