DS1210 Nonvolatile Controller Chip
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- Norman Cummings
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1 Nonvolatile Controller Chip FEATURES Converts CMOS RAMs into nonvolatile memories Unconditionally write protects when V CC is out of tolerance Automatically switches to battery when power-fail occurs Space saving 8-pin DIP Consumes less than 100 na of battery current Tests battery condition on power up Provides for redundant batteries Optional 5% or 10% power-fail detection Low forward voltage drop on the V CC switch Optional 16-pin SOIC surface mount package Optional industrial temperature range of -40 C to +85 C PIN ASSIGNMENT VCCO VBAT1 TOL GND PIN DESCRIPTION VCCO VBAT1 TOL GND VCCI VBAT2 CEO CE 8-pin DIP (300-mil) See Mech. Drawings Section S 16-pin SOIC (300-mil) See Mech. Drawings Section VCCI VBAT2 CEO CE V CCO - RAM Supply V BAT1 - + Battery 1 TOL - Power Supply Tolerance GND - Ground CE - Chip Enable Input CEO - Chip Enable Output V BAT2 - + Battery 2 V CCI - + Supply - No Connect DESCRIPTION The Nonvolatile Controller Chip is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry uses a lowleakage CMOS process which affords precise voltage detection at extremely low battery consumption. The 8-pin DIP package keeps PC board real estate requirements to a minimum. By combining the Nonvolatile Controller Chip with a CMOS memory and batteries, nonvolatile RAM operation can be achieved. 1 of
2 OPERATION The nonvolatile controller performs five circuit functions required to battery back up a RAM. First, a switch is provided to direct power from the battery or the incoming supply (V CCI ) depending on which is greater. This switch has a voltage drop of less than 0.3V. The second function which the nonvolatile controller provides is power-fail detection. The constantly monitors the incoming supply. When the supply goes out of tolerance a precision comparator detects power-fail and inhibits chip enable ( CEO ). The third function of write protection is accomplished by holding the CEO output signal to within 0.2 volts of the V CCI or battery supply. If CE input is low at the time power-fail detection occurs, the CEO output is kept in its present state until CE is returned high. The delay of write protection until the current memory cycle is completed prevents the corruption of data. Power-fail detection occurs in the range of 4.75 volts to 4.5 volts with the tolerance Pin 3 grounded. If Pin 3 in connected to V CCO, then power-fail detection occurs in the range of 4.5 volts to 4.25 volts. During nominal supply conditions CEO will follow CE with a maximum propagation delay of 20ns. The fourth function the performs is a battery status warning so that potential data loss is avoided. Each time that the circuit is powered up the battery voltage is checked with a precision comparator. If the battery voltage is less than 2.0 volts, the second memory cycle is inhibited. Battery status can, therefore, be determined by performing a read cycle after power-up to any location in memory, verifying that memory location content. A subsequent write cycle can then be executed to the same memory location altering the data. If the next read cycle fails to verify the written data, then the batteries are less than 2.0V and data is in danger of being corrupted. The fifth function of the nonvolatile controller provides for battery redundancy. In many applications, data integrity is paramount. In these applications it is often desirable to use two batteries to ensure reliability. The controller provides an internal isolation switch which allows the connection of two batteries. During battery backup operation the battery with the highest voltage is selected for use. If one battery should fail, the other will take over the load. The switch to a redundant battery is transparent to circuit operation and to the user. A battery status warning will occur when the battery in use falls below 2.0 volts. A grounded V BAT2 pin will not activate a battery-fail warning. In applications where battery redundancy is not required, a single battery should be connected to the BAT1 pin. The BAT2 battery pin must be grounded. The nonvolatile controller contains circuitry to turn off the battery backup. This is to maintain the battery(s) at its highest capacity until the equipment is powered up and valid data is written to the SRAM. While in the freshness seal mode the CEO and V CCO will be forced to V OL. When the batteries are first attached to one or both of the V BAT pins, V CCO will not provide battery back-up until V CCI exceeds V CCTP, as set by the T OL pin, and then falls below V BAT. Figure 1 shows a typical application incorporating the in a microprocessor-based system. Section A shows the connections necessary to write protect the RAM when V CC is less than 4.75 volts and to back up the supply with batteries. Section B shows the use of the to halt the processor when V CC is less than 4.75 volts and to delay its restart on power-up to prevent spurious writes. 2 of 6
3 SECTION A - BATTERY BACKUP Figure 1 BATTERY BACKUP CURRENT DRAIN EXAMPLE CONSUMPTION I BAT 100 na RAM I CC02 10 µa Total Drain 10.1 µa SECTION B - PROCESSOR RESET 3 of 6
4 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground -0.3V to +7.0V Operating Temperature 0 C to 70 C Storage Temperature -55 C to +125 C Soldering Temperature 260 C for 10 seconds * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. RECOMMENDED DC OPERATING CONDITIONS (0 C to 70 C) Pin 3 = GND Supply Voltage V CCI V 1 Pin 3 = V CCO Supply Voltage V CCI V 1 Logic 1 Input V IH 2.2 V CC +0.3 V 1 Logic 0 Input V IL V 1 Battery Input V BAT1, V BAT V 1, 2 (0 C to 70 C; V CCI = 4.75 to 5.5V PIN 3 = GND) DC ELECTRICAL CHARACTERISTICS (V CCI = 4.5 to 5.5V, PIN 3 = V CCO ) Supply Current I CCI 5 ma 3 Supply Voltage V CCO V CC -0.2 V 1 Supply Current I CCO1 80 ma 4 Input Leakage I IL µa Output Leakage I LO µa CEO 2.4V I OH -1.0 ma 5 CEO 0.4V I OL 4.0 ma 5 V CC Trip Point (TOL=GND) V CCTP V 1 V CC Trip Point (TOL=V CCO ) V CCTP V 1 (0 C to 70 C; V CCI = < V BAT ) CEO Output V OHL V BAT -0.2 V 7 V BAT1 or V BAT2 Battery Current Battery Backup V CCO = V BAT 0.3V I BAT 100 na 2, 3 I CCO2 50 µa 6, 7 4 of 6
5 CAPACITAE (T A = 25 C) Input Capacitance C IN 5 pf Output Capacitance C OUT 7 pf (0 C to 70 C; V CCI = 4.75V to 5.5V, PIN 3 = GND) AC ELECTRICAL CHARACTERISTICS (V CCI = 4.75V to 5.5V, PIN 3 = GND) CE Propagation Delay t PD ns 5 CE High to Power-Fail t PF 0 ns (0 C to 70 C; V CCI = 4.75V, PIN 3 = GND; V CCI < 4.5, PIN 3 = V CCO ) Recovery at Power Up t REC ms V CC Slew Rate Power-Down t F 300 µs V CC Slew Rate Power-Down t FB 10 µs V CC Slew Rate Power-Down t R 0 µs CE Pulse Width t CE 1.5 µs 8 NOTES: 1. All voltages are referenced to ground. 2. Only one battery input is required. Unused battery inputs must be grounded. 3. Measured with V CCO and CEO open. 4. I CC01 is the maximum average load which the can supply to the memories. 5. Measured with a load as shown in Figure I CC02 is the maximum average load current which the can supply to the memories in the battery backup mode. 7. t CE max. must be met to ensure data integrity on power loss. 8. CEO can only sustain leakage current in the battery backup mode. 5 of 6
6 TIMING DIAGRAM: POWER-UP TIMING DIAGRAM: POWER-DOWN OUTPUT LOAD Figure 2 6 of 6
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DS21T09 Plug and Play SCSI Terminator www.dalsemi.com FEATURES Fully compliant with SCSI-1, Fast SCSI and Ultra SCSI Compatible with Plug and Play SCSI Profile Functional drop in replacement for the DS2109
Distributed by: www.jameco.com 1-800-831-4242 The content and copyrights of the attached material are the property of its owner. APPLICATION NOTE A V A I L A B L E AN61 16K X25160 2K x 8 Bit SPI Serial
S-2900A. Rev CMOS 512-bit SERIAL E 2 PROM
Rev.1.11 CMOS 512-bit SERIAL E 2 PROM S-29A The S-29A is a wide operating voltage range, low power consumption 512-bit E 2 PROM. The organization is 64-word 8-bit, and can be read or written serially.
DS2401 Silicon Serial Number
Silicon Serial Number www.maxim-ic.com FEATURES Upgrade and drop-in replacement for DS2400 Extended 2.8 to 6.0 voltage range Multiple s can reside on a common 1-Wire Net Unique, factory-lasered and tested
XC1700D Family of Serial Configuration PROMs. Features. Description. November 25, 1997 (Version 1.1) 0 5* Product Specification
0 XC1700D Family of Serial Configuration PROMs November 25, 1997 (Version 1.1) 0 5* Product Specification Features Extended family of one-time programmable (OTP) bit-serial read-only memories used for
XC95288 In-System Programmable CPLD
0 XC95288 In-System Programmable CPLD November 12, 1997 (Version 2.0) 0 3* Preliminary Product Specification Features 15 ns pin-to-pin logic delays on all pins f CNT to 95 MHz 288 macrocells with 6,400
ACE24AC02A1 Two-wire Serial EEPROM
Description The ACE24AC02A1 is 2048 bits of serial Electrical Erasable and Programmable Read Only Memory, commonly known as EEPROM. They are organized as 256 words of 8 bits (1 byte) each. The devices
CAT28C K-Bit Parallel EEPROM
256K-Bit Parallel EEPROM HALOGENFREE LEAD TM FREE FEATURES Fast read access times: 120/150ns Low power CMOS dissipation: Active: 25 ma max Standby: 150 µa max Simple write operation: On-chip address and
Am29F040B. Data Sheet
Am29F040B Data Sheet July 2003 The following document specifies Spansion memory products that are now offered by both Advanced Micro Devices and Fujitsu. Although the document is marked with the name of
Turning Ideas Into Reality ABCircuits POB 123 New Hill NC (919) C922-SO IC
ABCircuits www.abcircuits.com POB 123 New Hill 27562 (919) 290-7104 74C922-SO IC Keyboard / Keypad Encoder for up to 16 switches MM74C922 Replacement IC General Description The 74C922-SO is designed as
Distributed by: www.jameco.com 1-800-831-4242 The content and copyrights of the attached material are the property of its owner. DS12887 Real Time Clock www.dalsemi.com FEATURES Drop in replacement for
DS WIRE INTERFACE 11 DECOUPLING CAP GND
Rev ; 4/3 Hex Nonvolatile Potentiometer with General Description The contains six 256-position nonvolatile (NV) potentiometers, 64 bytes of NV user EEPROM memory, and four programmable NV I/O pins. The
Description. Features. Pin Configuration PI4IOE5V9539
16-bit I 2 C-bus and SMBus low power I/O port with interrupt and reset Features Operation power supply voltage from 2.3V to 5.5V 16-bit I 2 C-bus GPIO with interrupt and reset 5V tolerant I/Os Polarity
DS3065WP 3.3V, 8Mb, Nonvolatile SRAM with Clock
General Description The DS3065WP consists of a static RAM, a nonvolatile (NV) controller, and a real-time clock (RTC). These components are packaged on a surface-mount substrate and require post-assembly
DS232A Dual RS-232 Transmitter/Receiver
Dual RS-232 Transmitter/Receiver www.dalsemi.com FEATURES Compatible with LT1181A and MAX232A High data rate - 250 kbits/sec under load 16-pin DIP or SOIC package 20-pin TSSOP package for height restricted
DS1305. Serial Alarm Real Time Clock (RTC) FEATURES PIN ASSIGNMENT ORDERING INFORMATION
DS135 Serial Alarm Real Time Clock (RTC) FEATURES Real time clock counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap year compensation valid up to 21 96 byte
Features VCC MIC1810 RESET RESET
Microprocessor Reset Circuit General Description The is an inexpensive microprocessor supervisory circuit that monitors power supplies in microprocessor based systems. The function of these devices is
ICE27C Megabit(128KX8) OTP EPROM
1- Megabit(128KX8) OTP EPROM Description The is a low-power, high-performance 1M(1,048,576) bit one-time programmable read only memory (OTP EPROM) organized as 128K by 8 bits. It is single 5V power supply
DS Wire Digital Thermometer and Thermostat
www.maxim-ic.com FEATURES Temperature measurements require no external components with ±1 C accuracy Measures temperatures from -55 C to +125 C; Fahrenheit equivalent is -67 F to +257 F Temperature resolution
ACE24AC16B Two-wire Serial EEPROM
Description The ACE24AC16B is 16,384 bits of serial Electrical Erasable and Programmable Read Only Memory, commonly known as EEPROM. They are organized as 2,048 words of 8 bits (1 byte) each. The devices