IL1232D

IN1232 IKSEMICON | Alldatasheet

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Technical content

WITH BUILT-IN WATCHDOG TIMER

ORDERING INFORMATION

TA = -40° to 85° C for all packages. 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. 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. IN1232 The chip contains reference voltage source, analog comparator, Watchdog timer, circuit for monitoring power supply deviation accuracy. Functions:
• Reset signal generation after power failure/ error
• Reset signal generation from external “RESET” pushbutton
• Reset signal generation from watchdog timer Fig 1 – PIN ASSIGNMENT

06 RST

05 RSTGND 04

08 Vcc

Table 1 – Absolute maximum ratings Typical Symbol Parameter Min Max Units VСС Supply voltage - 7.0 V VIH Input voltage, high level - 7.0 V VIL Input voltage, low level -1.0 - V ТA Operating temperature range -40 +85 °С Tstg Storage temperature -60 +125 °С

Table 2 – Recommended operating conditions Typical Symbol Parameter Min Max Units VСС Supply voltage 4.5 5.5 V VIH Input voltage, high level 2.0 UСС+0.3 V VIL Input voltage, low level -0.3 0.8 V ТA Operating temperature range -20 +70 °С Table 3 DC electrical characteristics (TAmb = -40° to +85°С) Typical Symbol Parameter Test conditions min max Units ILIL1 Input leakage current, low level, ST, TOL VCC=5 V±10%, VIL=0 V - -1 µА ILIL2 Input leakage current, low level, TD VCC=5 V±10%, VIL=0 V - -300 µА ILIL3 Input leakage current, low level, PBRST VCC=5 V±10%, VIL=0 V - -1000 µА ILIH1 Input leakage current, high level, ST, TOL VCC =5 V±10%, VIH=VCC - 1 µА ILIH2 Input leakage current, high level, TD VCC =5 V±10%, VIH=VCC - 300 µА IOH Output current, high level, RST VCC =5 V±10%, VOH=2.4 V -8 - µА IOL Output current, low level, RST, RST VCC =5 V±10%, VOL=0.4 V 8 - mА VOH Output voltage, high level, RST VCC =5 V±10%, IOH= -500 µА VСС-0.5 - V VOH1 Output voltage, high level,- RST VCC =2 V, IOH= -500 µА VСС-0.5 - V VOL Output voltage, low level, RST VCC =2 V, IOL=1 mА - 0.4 V IСС Operating current VCC =5 V±10% - 2 mА VCC TP1 VCC trip point TOL = GND 4.5 4.74 V VCC TP2 VCC trip point TOL = VCC 4.25 4.49 V

Table 4 – AC electrical characteristics (Тamb = from -40 to +85 °С) Typical Symbol Parameter Test conditions min max Units tTD1 Watchdog timer overflow time VCC =5.0 V±10% tST≥20 ns TD = GND 62.5 250 ms tTD2 TD disconnected 250 1000 ms tTD3 TD = VCC 500 2000 ms tPDLY PBRST stable low to RST and RST VCC =5.0 V±10% tPB≥20 ms - 20 ms tRST Reset active time VCC =5.0 V±10% tPB≥20 ms 250 1000 ms tRPD VCC fail detect to RST and RST VCC =from 5.0 to 4.0 V tF≥10 µs - 175 µs tRPU VCC detect to RST and RST transition VCC = from 5.0 to 4.0 V tR≥1 µs 250 1000 ms Table 5 – Pin description Pin Symbol Description

01 PBRST Pushbutton reset input

02 TD Time Delay Set

03 TOL Selects 5% or 10% VCC Detect

04 GND Ground

05 RST Reset output (Active High)

06 RST Reset output (Active Low, open drain)

07 ST Strobe Input

08 VCC Supply output from voltage source

tPB≥20 ms tPDLY≤20 ms 250 ms≤tRST≤1000 ms VIL VIH tRST tPB tPDLY PBRST ____ RST RST Fig. 2 – Timing diagram of forming reset signal from external PBRST control button t ST MAX MIN t TD1 - t TD3 RST ___ ST Indeterminate strob Valid strob Invalid strob tST ≥20 нс 62.5 ms≤ tTD1 ≤250 ms 250 ms≤ tTD2 ≤1000 ms 500 ms≤ tTD3 ≤2000 ms Fig. 3 – Timing diagram : Strobe input

tF ≥10 µs tRPD ≤175 µs Fig. 4 – Timing diagram: power error / down to VCCTP tR ≥1 µs 250 ms≤ tRPU ≤1000 ms ____ RST RST VOL VOH tRPD tR tRPU VOH VOL RST RST VCC VCCTP 4.75 V 4.25 V VCC 4.25 V 4.5 V 4.75 V tF Fig. 5 – Timing diagram: Power-Up/ Stable

Fig.6 Block diagram Referance voltage source Vcc tolerance Bias Watchdog timer RST RST GND PBRST TD ST TOL VCC IN1232 Fig.7 Application Circuit : Watchdog Timer

(MS – 001BA) Symbol MIN MAX A 8.51 10.16 B 6.1 7.11 C 5.33 D 0.36 0.56 F 1.14 1.78 G H J 0° 10° K 2.92 3.81 NOTES: L 7.62 8.26 1. Dimensions “A”, “B” do not include mold flash or protrusions. M 0.2 0.36 Maximum mold flash or protrusions 0.25 mm (0.010) per side. N 0.38 D SUFFIX SOIC (MS - 012AA) Symbol MIN MAX A 4.8 5 B 3.8 4 C 1.35 1.75 D 0.33 0.51 F 0.4 1.27 G H J 0° 8° NOTES: K 0.1 0.25 1. Dimensions A and B do not include mold flash or protrusion. M 0.19 0.25 1.27 5.72 Dimension, mm Dimension, mm 2.54 7.62 A BH C K C M J F M P G D R x 45 SEATING PLANE 0.25 (0.010) M T -T- L H M J A B F G D SEATING PLANE N K 0.25 (0.010) M T -T- C