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| TECHNICAL DATA POWER SUPPLY CONTROL WITH BUILT-IN WATCHDOG TIMER IN1232 is designed to monitor power supply within the system of reset signal generation for microprocessors. It is used in monitor systems for controlling various processes and entities. Packaged in 8-pin SOP or DIP. IN1232 Features: * * * * Rated supply voltage 5.0 V Accurate 5% or 10% microprocessor power supply monitoring Programming of watchdog timer overflow time Generation of reset signals at power on for correct microproces sor start. ORDERING INFORMATION IL1232N Plastic IL1232D SOIC TA = -40 to 85 C for all packages. The chip contains reference voltage source, analog comparator, Watchdog timer, circuit for monitoring power supply deviation accuracy. . PBRST 01 08 Vcc 07 06 05 ST RST RST Functions: * * * Reset signal generation after power failure/ error Reset signal generation from external "RESET" pushbutton Reset signal generation from watchdog timer TD TOL 02 03 GND 04 Fig 1 - PIN ASSIGNMENT Table 1 - Absolute maximum ratings Symbol V VIH VIL A Tstg Parameter Supply voltage Input voltage, high level Input voltage, low level Operating temperature range Storage temperature Typical Min -1.0 -40 -60 Max 7.0 7.0 +85 +125 Units V V V 1 IN1232 Table 2 - Recommended operating conditions Symbol V VIH VIL A Parameter Supply voltage Input voltage, high level Input voltage, low level Operating temperature range Typical Min 4.5 2.0 -0.3 -20 Max 5.5 U+0.3 0.8 +70 Units V V V Table 3 DC electrical characteristics (TAmb = -40 to +85) Symbol ILIL1 ILIL2 ILIL3 ILIH1 ILIH2 IOH IOL VOH VOH1 VOL Parameter Input leakage current, low level, ST, TOL Input leakage current, low level, TD Input leakage current, low level, PBRST Input leakage current, high level, ST, TOL Input leakage current, high level, TD Output current, high level, RST Output current, low level, RST, RST Output voltage, high level, RST Output voltage, high level,- RST Output voltage, low level, RST Operating current VCC trip point VCC trip point Test conditions VCC=5 V10%, VIL=0 V VCC=5 V10%, VIL=0 V VCC=5 V10%, VIL=0 V VCC =5 V10%, VIH=VCC VCC =5 V10%, VIH=VCC VCC =5 V10%, VOH=2.4 V VCC =5 V10%, VOL=0.4 V VCC =5 V10%, IOH= -500 VCC =2 V, IOH= -500 VCC =2 V, IOL=1 m VCC =5 V10% Typical min max Units -8 8 V-0.5 V-0.5 4.5 4.25 -1 -300 -1000 1 300 0.4 2 4.74 4.49 m V V V m V V I VCC TP1 VCC TP2 TOL = GND TOL = VCC 2 IN1232 Table 4 - AC electrical characteristics (amb = from -40 to +85 ) Symbol tTD1 Parameter Watchdog timer overflow time Test conditions tST20 ns TD = GND TD disconnected TD = VCC tPB20 ms VCC =5.0 V10% tPB20 ms VCC =from 5.0 to 4.0 V tF10 s VCC = from 5.0 to 4.0 V tR1 s VCC =5.0 V10% VCC =5.0 V10% Typical min max Units 62.5 250 ms tTD2 tTD3 tPDLY tRST tRPD PBRST stable low to RST and RST Reset active time VCC fail detect to RST and RST VCC detect to RST and RST transition 250 500 250 - 1000 2000 20 1000 175 ms ms ms ms s tRPU 250 1000 ms Table 5 - Pin description Pin 01 02 03 04 05 06 07 08 Symbol PBRST TD TOL GND RST RST ST VCC Pushbutton reset input Time Delay Set Selects 5% or 10% VCC Detect Ground Reset output (Active High) Reset output (Active Low, open drain) Strobe Input Supply output from voltage source Description 3 IN1232 ______ PBRST VIL tPB tPDLY VIH tRST ____ RST RST tPB20 ms tPDLY20 ms 250 mstRST1000 ms Fig. 2 - Timing diagram of forming reset signal from external PBRST control button ___ ST Invalid strob Valid strob Indeterminate strob t ST MIN t TD1 - t TD3 MAX RST tST 20 62.5 ms tTD1 250 ms 250 ms tTD2 1000 ms 500 ms tTD3 2000 ms Fig. 3 - Timing diagram : Strobe input 4 IN1232 tF 4.75 V 4.5 V 4.25 V VCC ____ RST tRPD VOH RST s tF 10 V OL tRPD 175 s Fig. 4 - Timing diagram: power error / down to VCCTP tR 4.75 V VCCTP 4.25 V VCC tRPU RST VOH RST tR 1 s 250 ms tRPU 1000 ms VOL Fig. 5 - Timing diagram: Power-Up/ Stable 5 IN1232 ST TD VCC TOL Watchdog timer Vcc tolerance Bias Referance voltage source + RST RST PBRST GND Fig.6 Block diagram IN1232 Fig.7 Application Circuit : Watchdog Timer 6 IN1232 N SUFFIX PLASTIC DIP (MS - 001BA) A 8 5 B 1 4 Dimension, mm Symbol A B MIN 8.51 6.1 MAX 10.16 7.11 5.33 0.36 1.14 2.54 7.62 0 2.92 7.62 0.2 0.38 10 3.81 8.26 0.36 0.56 1.78 F L C D C -T- SEATING N G D 0.25 (0.010) M T K PLANE F G M H J H J K L M N NOTES: 1. Dimensions "A", "B" do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. D SUFFIX SOIC (MS - 012AA) Dimension, mm 5 A 8 Symbol A B P MIN 4.8 3.8 1.35 0.33 0.4 1.27 5.72 0 0.1 0.19 5.8 0.25 MAX 5 4 1.75 0.51 1.27 H B C 1 G 4 C R x 45 D F -TD 0.25 (0.010) M T C M K SEATING PLANE G J F M H J K M P R 8 0.25 0.25 6.2 0.5 NOTES: 1. Dimensions A and B do not include mold flash or protrusion. 2. Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B 0.25 mm (0.010) per side. 7 |
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