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
T
A
= -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
СС
V
IH
V
IL
Т
A
T
stg
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
°С
°С
1
IN1232
Table 2 – Recommended operating conditions
Symbol
V
СС
V
IH
V
IL
Т
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
СС
+0.3
0.8
+70
Units
V
V
V
°С
Table 3 DC electrical characteristics (T
Amb
= -40° to +85°С)
Symbol
I
LIL1
I
LIL2
I
LIL3
I
LIH1
I
LIH2
I
OH
I
OL
V
OH
V
OH1
V
OL
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
V
CC
trip point
V
CC
trip point
Test conditions
V
CC
=5 V±10%,
V
IL
=0 V
V
CC
=5 V±10%,
V
IL
=0 V
V
CC
=5 V±10%,
V
IL
=0 V
V
CC
=5 V±10%,
V
IH
=V
CC
V
CC
=5 V±10%,
V
IH
=V
CC
V
CC
=5 V±10%,
V
OH
=2.4 V
V
CC
=5 V±10%,
V
OL
=0.4 V
Typical
min
max
Units
-
-
-
-
-
-8
8
V
СС
-0.5
V
СС
-0.5
-
-
4.5
4.25
-1
-300
-1000
1
300
-
-
-
-
0.4
2
4.74
4.49
µА
µА
µА
µА
µА
µА
mА
V
V
V
mА
V
V
I
OH
= -500
µА
I
OH
= -500
µА
I
OL
=1 mА
V
CC
=2 V,
V
CC
=2 V,
V
CC
=5 V±10%,
I
СС
V
CC TP1
V
CC TP2
V
CC
=5 V±10%
TOL = GND
TOL =
V
CC
2
IN1232
Table 4 – AC electrical characteristics
(Тamb = from -40 to +85
°С)
Symbol
t
TD1
Parameter
Watchdog timer overflow
time
Test conditions
t
ST
≥20
ns
TD = GND
TD disconnected
TD =
V
CC
t
PB
≥20
ms
V
CC
=5.0 V±10%
t
PB
≥20
ms
V
CC
=from 5.0 to
4.0 V
t
F
≥10 µs
V
CC
= from 5.0 to
4.0 V
t
R
≥1 µs
V
CC
=5.0 V±10%
V
CC
=5.0 V±10%
Typical
min
max
Units
62.5
250
ms
t
TD2
t
TD3
t
PDLY
t
RST
t
RPD
PBRST stable low to RST
and RST
Reset active time
V
CC
fail detect to RST and
250
500
-
250
-
1000
2000
20
1000
175
ms
ms
ms
ms
µs
RST
t
RPU
transition
V
CC
detect to RST and RST
250
1000
ms
Table 5 – Pin description
Pin
01
02
03
04
05
06
07
08
Symbol
PBRST
TD
TOL
GND
RST
RST
ST
V
CC
Pushbutton reset input
Time Delay Set
Selects 5% or 10% V
CC
Detect
Ground
Reset output (Active High)
Reset output (Active Low, open drain)
Strobe Input
Supply output from voltage source
Description
3
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