PT8A /31-33/41-43 Universal Timer Controller
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1 Features Auto-shut off output once time-out Button to ON/OFF/RESET timer Available timer with high precision same as AC 50/60Hz Build-in RC oscillator Drive external SCR Support 50/60Hz by part Quick Test Mode (QTM) for manufacturer Available timer of 5/0/45/60/90/0/40/480min Low cost lead free package: TO-9 or DIP-8 or SOIC-8 Pin Configuration PT8A5//A-H PT8A5//A-H TO9- (Top View) Description Universal timer is a mixed signal CMOS IC designed for a fixed timer to drive external SCR to implement safety power control. It is applied to 0V/40V and 50/60Hz AC power supply. It can automatically shut-off load in order to prevent undesired conditions from the system. Internal timer can present several kinds of different time: 5mins, 0mins, 45mins, hr,.5hrs, hrs, 4hrs and 8hrs, which is decided by part number. Applications PT8A54// DIP-8 or SOIC-8 (Top View) TO9- Pin Description PT8A5//A-H, PT8A5//A-H Pin Name Pin No I/O Pin Description - Power supply SCR I/O SCR output and button input, high active GND - Ground PT8A54// Pin Name Pin No. I/O Pin Description TS I Timer selection pins(ts TS TS0 from 000~) TS I 000: 5m, 00: 0m, 00: 45m, 0: 60m, 00: 90m, 0: 0m,0: 40m,: 480m TS0 I Default 0 by TS internal pull down, TS&TS0 internal pull up. GND 4 - Ground. SCR 5 I/O SCR output and button input, high active. NC 6 I/O No connection. ACSEL 7 I 50/60Hz selection pin: default is 60Hz by internal pull down; connecting to is 50Hz. 8 - Power supply.
2 Maximum Ratings Storage Temperature o C to +5 o C Supply Voltage to Ground Potential (Input & V CC Only) V to V CC + 0.5V Supply Voltage to Ground Potential (Output s & D/O Only) V to V CC + 0.5V DC Input Voltage V to V CC + 0.5V DC Output Current... 0mA Power Dissipation mW Recommended operation conditions Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Symbol Parameter Min Typ Max Unit V CC Operating Voltage V T A Operating temperature Electrical Characteristics Sym Parameter V CC Test Conditions Conditions Min Typ Max Unit V CC Shunt Regulator output voltage - I CC =ma V V TH Input high threshold(scr) 5V V V TH Input low threshold(scr) 5V V I OH Output Source Current (SCR) 5V V OH=.5V ma I OL Output Sink Current (SCR) 5V V OL=0.5V 6 4 μa I CC Power supply current 4.0V ma F OSC Frequency of internal oscillator 5V KHz
3 Block Diagram Figure Function block diagram ACSEL Reference circuit Clock extracting circuit GND Shunt Regulator SCR driving circuit SCR Internal RC Oscillator PBO Button sampling circuit Timer Chain 5/0/45/60m/90m/h/4h/8h Functional Description (Note: In below description, RELAY presents a pin, while relay means a device.) Reference and Shunt Regulator Reference circuit generates.v -independent and temperature-independent voltage to provide reference voltage for the build-in shunt regulator. The regulator supplies all internal function blocks. Clock extracting circuit is not only the power supply pin but also clock source for internal precise timer. With the help of the external circuit, the AC 50/60Hz clock signal can be extracted to be used as timer clock source. Internal RC oscillator circuit It is employed to create pulse driving signal for RELAY, it is a completely internal RC oscillator with frequency of about 8KHZ. Timer chain Timer chain can be used to generate various timer including 5/0/45/60/90/0/40/480min. Button sampling circuit With external buttons, ON/OFF/RESET function can be realized. User can select one button with once ON, once OFF or two buttons to turn ON or OFF separately, also use one button to restart timer. Button sampling circuit senses button s operation times per 8ms.System will sample the button s operation during first 00ms after power on, if buttons are pressed during this period, then system will start s timer to check if the chip will enter into quick test mode (see test mode section). If the related button is pressed over s just after power on, chip will enter quick test mode as soon as the button is released. If buttons are not pressed during first 00ms, system will operate normally. SCR driving circuit System outputs high to drive high sensitive SCR. Quick Test Mode(QTM) In order to make the manufacturer s test convenient, quick test mode is designed to speed up the test. QTM can be accessed by pressing button (ON/RESET) over s (option s) once power on. It can exit automatically after quick test timer is expired, system needs to power on again to come back normal operation after quick test mode. Any button operations will be ignored in QTM. Fig 4 operation illustration of entering into and exitting Quick test mode Power on <00ms >s First PB ON sampling time Second PB ON *s for hrs will be ignored Quick test mode s warm up Normal mode Operation illustration of entering into and exiting Quick test mode Below table shows the timer in QTM corresponding to real timer. Table Real timer compared to the timer in QTM Real timer 5m 0m 45m 60m 90m 0m 40m 480m Timer in QTM s 4s 6s 8s 0s s 4s 6s
4 Application Circuit Note: SCR is high sensitive SCR which the gate trigger current is about 00uA. TO -9 Universal Timer to drive SCR with on e bu tton ACL D R IN4007 0V/40V 0V/0 V 4K */W 00K * /W C uf/6v C U SCR S RESET or ON/OFF R 5.6K LOAD Q ACN GND PT8A5/-PT8A5/ R K C *Note: For 0VAC power supply system, R value is 4K. For 40VAC power supply system, R value is 00K. Note: C value range is uf to 68uF. TO -9 Universal Timer to drive SCR with two bu ttons ACL D R PT8A5-PT8A5 IN4007 0V/40V 0V/0 V ACN 4K */W 00K * /W C uf/6v C U GND SCR S ON S OFF R 5.6K R K C LOAD Q *Note: For 0VAC power supply system, R value is 4K. For 40VAC power supply system, R value is 00K. Note: C value range is uf to 68uF. 4
5 DIP8 Universal Timer to drive SCR with one button ACL D IN4007 0V/40V ACN R 4K /W* 00K /W* C uf/6v C 4 U TS TS ACSEL TS0 NC GND SCR PT8A54/PE K S RESET or ON/OFF R 5.6K R K C LOAD Q *Note: For 0VAC/60Hz power supply system, R value is 4K, ACSEL is connected to GND or floating. For 40VAC/50Hz power supply system, R value is 00K, ACSEL is connected to. *Note: TS0, TS and TS are floating, the timer time out is 60 minutes. Note: C value range is uf to 68uF. DIP8 Universal Timer to drive SCR with two buttons ACL D IN4007 R 4K /W* 00K /W* U TS 8 LOAD 0V/40V ACN C uf/6v C 4 TS ACSEL TS0 NC GND SCR PT8A54PE K S ON R 5.6K S OFF R K C Q *Note: For 0VAC/60Hz power supply system, R value is 4K, ACSEL is connected to GND or floating. For 40VAC/50Hz power supply system, R value is 00K, ACSEL is connected to. *Note: TS0, TS and TS are floating, the timer time out is 60 minutes. Note: C value range is uf to 68uF. 5
6 Mechanical Information TO9-L 6
7 DIP-8L 7
8 SOIC-8L 8
9 Ordering Information Note: Ordering No. Package Code Package PT8A5xNBE* NB Lead free TO-9 PT8A5xNBE* NB Lead free TO-9 PT8A5xNBE* NB Lead free TO-9 PT8A5xNBE* NB Lead free TO-9 PT8A5xNBE* NB Lead free TO-9 PT8A5xNBE* NB Lead free TO-9 PT8A54PE* P Lead free DIP-8 PT8A54PE* P Lead free DIP-8 PT8A54PE* P Lead free DIP-8 PT8A54WE W Lead free and Green SOIC-8 PT8A54WE W Lead free and Green SOIC-8 PT8A54WE* W Lead free and Green SOIC-8 x shows A~H with different Internal Timer, see below Suffix x: Internal Timer table. E = Pb-free or Pb-free & Green Adding X Suffix= Tape/Reel *contact Pericom for availability. Function Comparison Table Part No One/Two 50/60 One/Two 50/60 Button Part No Button key Hz key Hz PT8A5x One Reset 50HZ PT8A5x One Reset 60HZ PT8A5x One On/Off 50HZ PT8A5x One On/Off 60HZ PT8A5x Two On, Off 50HZ PT8A5x Two On, Off 60HZ Part No One/Two key Button 50/60 Hz Timer(min) PT8A54 One Reset Optional Optional PT8A54 One On/Off Optional Optional PT8A54 Two On, Off Optional Optional Suffix x: Internal Timer Table Suffix A B C D E F G H Internal Timer(min) Pericom Semiconductor Corporation Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom. 9
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Description OUT0 1 OUTA1 OUTA1 2 OUTA2 3 OUTA3 OUTA4 OUTB1 6 OUTB2 7 OUTB2 OUTB3 OUTB4. All trademarks are property of their respective owners.
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