PT8A2521 PERICOM | Alldatasheet

Document overview

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Technical content

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 15/30/45/60/90/120/240/480min  Low cost lead free package: TO-92 or DIP-8 or SOIC-8

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 120V/240V and 50/60H z 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: 15mins, 30mins, 45mins, 1hr, 1.5hrs, 2hrs, 4hrs and 8hrs, which is decided by part number.

Applications

 Universal Timer Controller Pin Configuration Pin Description PT8A2521/2/3A-H, PT8A2531/2/3A-H Pin Name Pin No I/O Pin Description VCC 1 - Power supply SCR 2 I/O SCR output and button input, high active GND 3 - Ground PT8A2541/2/3 Pin Name Pin No. I/O Pin Description TS2 1 I Timer selection pins(TS2 TS1 TS0 from 000~111) 000: 15m, 001: 30m, 010: 45m, 011: 60m, 100: 90m, 101: 120m,110: 240m,111: 480m Default 011 by TS2 internal pull down, TS1&TS0 internal pull up. TS1 2 I TS0 3 I 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 VCC is 50Hz. VCC 8 - Power supply. PT8A2521/2/3A-H PT8A2531/2/3A-H TO92-3 (Top View) PT8A2541/2/3 DIP-8 or SOIC-8 (Top View) TO92-3

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller Maximum Ratings Recommended operation conditions Symbol Parameter Min Typ Max Unit VCC Operating Voltage 4.2 4.7 5.2 V TA Operating temperature 0 25 85 ℃

Electrical Characteristics

VCC Shunt Regulator output voltage - ICC =1mA 4.2 4.7 5.2 V VTH1 Input high threshold(SCR) 5V - 3.6 4 4.4 V VTH2 Input low threshold(SCR) 5V - 0.3 0.65 1.0 V IOH Output Source Current (SCR) 5V V OH1=2.5V -0.2 -0.3 -0.4 mA IOL Output Sink Current (SCR) 5V V OL1=0.5V 6 12 24 μA ICC Power supply current 4.0V - - - 0.5 mA FOSC Frequency of internal oscillator 5V - 96 128 160 KHz 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 condi - tions above those indicated in the oper ational sec - tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller Block Diagram VC C GND SC R Figure 2 Function block diagram Ref erence circuit Shunt Regulator Internal RC Oscillator Timer Chain SCR driving circuit Clock extracting circuit Button sampling circuit AC SE L PBO Functional Description (Note: In below description, “RELAY” presents a pin, while “relay” means a device.)

  • Reference and Shunt Regulator Reference circuit generates 1.2V VCC -independent and temperature-independent voltage to provide reference voltage for th e build -in shunt regulator. The regulator supplies all internal function blocks.
  • Clock extracting circuit VCC 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 si gnal 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 oscillato r with frequency of about 128KHZ.
  • Timer chain Timer chain can be used to generate various timer including 15/30/45/60/90/120/240/480min.
  • 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 3 times per 8ms .System will sample the button’s operation during first 100ms after power on, if buttons are pressed during this period, then system will start 3s timer to check if the chip will enter into quick test mode (see test mode section). If the related button is pressed over 3s just after power on, chip will enter quick test mode as soon as the button is released. If buttons are not pressed during first 100ms, 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 3s (option 2s) 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. First PB ON Second PB ON Power on >3s *12s for 2hrs 3s warm up Fig 4 operation illustration of entering into and exitting Quick test mode sampling time Normal modeQuick test mode will be ignored <100ms Below table shows the timer in QTM corresponding to real timer. Table Real timer compared to the timer in QTM Real timer 15m 30m 45m 60m 90m 120m 240m 480m Timer in QTM 2s 4s 6s 8s 10s 12s 14s 16s Operation illustration of entering into and exiting Quick test mode

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller Application Circuit Note: SCR is high sensitive SCR which the gate trigger current is about 200uA. 104 IN 4007 5.6K 24K *1/2W ACL ACN RESET or ON/O F F Q1 T O -92 Universal T imer to drive SC R with on e bu tton 110V/220V 104 LOAD 22uF /16V V CC G ND SCR PT8A2521/2-PT8A2531/2 100K * 1/2W *Note1: For 120VAC power supply system, R1 value is 24K. For 240VAC power supply system, R1 value is 100K. Note2: C1 value range is 22uF to 68uF. 104 IN 4007 5.6K 24K *1/2W ACL ACN ON Q1 T O -92 Universal T imer to drive SC R with two bu ttons 110V/220V 104 LOAD 22uF /16V V CC G ND SCR PT8A2523-PT8A2533 100K * 1/2W OF F *Note1: For 120VAC power supply system, R1 value is 24K. For 240VAC power supply system, R1 value is 100K. Note2: C1 value range is 22uF to 68uF. 120V/240V 120V/240V

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller 24K 1/2W* ACL ACN RESET or ON/OFF DIP8 Universal Timer to drive SCR with one button IN4007 22uF/16V 120V/240V 100K 1/2W* 104 VCC TS12 TS03 TS21 GND4 SCR 5 NC 6 ACSEL 7 VCC 8 PT8A2541/2PE 5.6K 104 LOAD *Note1: For 120VAC/60Hz power supply system, R1 value is 24K, ACSEL is connected to GND or floating. For 240VAC/50Hz power supply system, R1 value is 100K, ACSEL is connected to VCC. *Note2: TS0, TS1 and TS2 are floating, the timer time out is 60 minutes. Note3: C1 value range is 22uF to 68uF. 24K 1/2W* ACL ACN ON DIP8 Universal Timer to drive SCR with two buttons IN4007 22uF/16V OFF 120V/240V 100K 1/2W* 104 VCC TS12 TS03 TS21 GND4 SCR 5 NC 6 ACSEL 7 VCC 8 PT8A2543PE 5.6K 104 LOAD *Note1: For 120VAC/60Hz power supply system, R1 value is 24K, ACSEL is connected to GND or floating. For 240VAC/50Hz power supply system, R1 value is 100K, ACSEL is connected to VCC. *Note2: TS0, TS1 and TS2 are floating, the timer time out is 60 minutes. Note3: C1 value range is 22uF to 68uF.

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller Mechanical Information TO92-3L

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller DIP-8L

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller SOIC-8L

2013-12-0013 PT0246-4 01/03/14 PT8A2521-23/31-33/41-43 Universal Timer Controller

Ordering Information

Ordering No. Package Code Package PT8A2521xNBE* NB Lead free TO-92 PT8A2522xNBE* NB Lead free TO-92 PT8A2523xNBE* NB Lead free TO-92 PT8A2531xNBE* NB Lead free TO-92 PT8A2532xNBE* NB Lead free TO-92 PT8A2533xNBE* NB Lead free TO-92 PT8A2541PE* P Lead free DIP-8 PT8A2542PE* P Lead free DIP-8 PT8A2543PE* P Lead free DIP-8 PT8A2541WE W Lead free and Green SOIC-8 PT8A2542WE W Lead free and Green SOIC-8 PT8A2543WE* W Lead free and Green SOIC-8 Note:  “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 key Button 50/60 Hz Part No One/Two key Button 50/60 Hz PT8A2521x One Reset 50HZ PT8A2531x One Reset 60HZ PT8A2522x One On/Off 50HZ PT8A2532x One On/Off 60HZ PT8A2523x Two On, Off 50HZ PT8A2533x Two On, Off 60HZ Part No One/Two key Button 50/60 Hz Timer(min) PT8A2541 One Reset Optional Optional PT8A2542 One On/Off Optional Optional PT8A2543 Two On, Off Optional Optional Suffix x: Internal Timer Table Suffix A B C D E F G H Internal Timer(min) 15 30 45 60 90 120 240 480 Pericom Semiconductor Corporation  1-800-435-2336  www.pericom.com 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.