IKSEMICON IN1232_11

TECHNICAL DATA
POWER SUPPLY CONTROL
WITH BUILT-IN WATCHDOG TIMER
IN1232
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.
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
Functions:
•
•
•
Reset signal generation after power failure/ error
Reset signal generation from external “RESET” pushbutton
Reset signal generation from watchdog timer
08 Vcc
TD
02
07
ST
TOL
03
06
RST
GND 04
05
RST
Fig 1 – PIN ASSIGNMENT
Table 1 – Absolute maximum
Symbol
ratings
Parameter
Typical
Units
Min
Max
-
7.0
V
V
V
VСС
Supply voltage
VIH
VIL
ТA
Input voltage, high level
Input voltage, low level
Operating temperature range
-1.0
-40
7.0
+85
°С
Tstg
Storage temperature
-60
+125
°С
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2011, February, Rev. 01
I N1232
Table 2 – Recommended operating conditions
Symbol
Typical
Parameter
Min
Max
Units
VСС
Supply voltage
4.5
5.5
V
VIH
VIL
ТA
Input voltage, high level
Input voltage, low level
Operating temperature range
2.0
-0.3
-20
UСС+0.3
0.8
+70
V
V
°С
Table 3 DC electrical characteristics (TAmb = -40° to +85°С)
Symbol
Parameter
ILIL1
Input leakage current,
low level, ST, TOL
VCC=5 V±10%,
Input leakage current,
low level, TD
VCC=5 V±10%,
Input leakage current,
low level, PBRST
VCC=5 V±10%,
Input leakage current,
high level, ST, TOL
VCC =5 V±10%,
Input leakage current,
high level, TD
VCC =5 V±10%,
Output current, high
level, RST
VCC =5 V±10%,
Output current, low
level, RST, RST
VCC =5 V±10%,
Output voltage, high
level, RST
ILIL2
ILIL3
ILIH1
ILIH2
IOH
IOL
VOH
Test conditions
Typical
Units
min
max
-
-1
µА
-
-300
µА
-
-1000
µА
-
1
µА
-
300
µА
-8
-
µА
8
-
mА
VCC =5 V±10%,
VСС-0.5
-
V
VIL=0 V
VIL=0 V
VIL=0 V
VIH=VCC
VIH=VCC
VOH=2.4 V
VOL=0.4 V
IOH= -500 µА
VOH1
Output voltage, high
level,- RST
VCC =2 V,
VСС-0.5
-
V
VOL
Output voltage, low level,
RST
Operating current
VCC =2 V,
-
0.4
V
VCC =5 V±10%
-
2
mА
VCC TP1
VCC trip point
VCC TP2
VCC trip point
TOL = GND
TOL = VCC
4.5
4.25
4.74
4.49
V
V
IСС
IOH= -500 µА
IOL=1 mА
2011, February, Rev. 01
I N1232
Table 4 – AC electrical characteristics (Тamb = from -40 to +85 °С)
Symbol
tTD1
Parameter
Watchdog timer overflow
time
tTD2
tTD3
tPDLY
PBRST stable low to RST
and RST
tRST
Reset active time
tRPD
VCC fail detect to RST and
tRPU
VCC detect to RST and RST
RST
transition
Typical
Test conditions
min
max
VCC =5.0 V±10%
62.5
250
tST≥20 ns
TD = GND
TD disconnected
TD = VCC
ms
250
500
1000
2000
VCC =5.0 V±10%
-
20
ms
ms
ms
250
1000
ms
-
175
µs
250
1000
ms
tPB≥20 ms
VCC =5.0 V±10%
tPB≥20 ms
VCC =from 5.0 to
4.0 V
tF≥10 µs
VCC = from 5.0 to
4.0 V
tR≥1 µs
Units
Table 5 – Pin description
Pin
Symbol
Description
01
PBRST
02
TD
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
Pushbutton reset input
Time Delay Set
2011, February, Rev. 01
I N1232
tPB
______
PBRST
tPDLY
VIH
VIL
tRST
____
RST
RST
tPB≥20 ms
tPDLY≤20 ms
250 ms≤tRST≤1000 ms
Fig. 2 – Timing diagram of forming reset signal from external PBRST control button
___
ST
Invalid strob
t
Indeterminate strob
Valid strob
MAX
MIN
ST
t
TD1
-t
TD3
RST
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
2011, February, Rev. 01
I N1232
tF
VCC
4.75 V
4.5 V
4.25 V
____
RST
tRPD
VOH
RST
μs
tF ≥10 V
tRPD ≤175 μs
OL
Fig. 4 – Timing diagram: power error / down to VCCTP
tR
4.75 V
VCCTP
4.25 V
tRPU
VCC
RST
RST
VOH
tR ≥1 μs
250 ms≤ tRPU ≤1000 ms
VOL
Fig. 5 – Timing diagram: Power-Up/ Stable
2011, February, Rev. 01
I N1232
ST
Watchdog timer
TD
VCC
Vcc tolerance Bias
TOL
Referance voltage
source
+
-
RST
RST
PBRST
GND
Fig.6 Block diagram
IN1232
Fig.7 Application Circuit : Watchdog Timer
2011, February, Rev. 01
I N1232
N SUFFIX PLASTIC DIP
(MS – 001BA)
A
Dimension, mm
5
8
B
1
4
MIN
MAX
A
8.51
10.16
B
6.1
7.11
C
L
F
Symbol
C
5.33
D
0.36
0.56
F
1.14
1.78
-T- SEATING
PLANE
N
G
M
K
0.25 (0.010) M
J
H
D
T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
G
2.54
H
7.62
J
0°
10°
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
D SUFFIX SOIC
(MS - 012AA)
Dimension, mm
A
8
5
B
H
1
G
P
4
D
K
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
R x 45
C
-T-
Symbol
SEATING
PLANE
J
F
0.25 (0.010) M T C M
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.
M
G
1.27
H
5.72
J
0°
8°
K
0.1
0.25
M
0.19
0.25
P
5.8
6.2
R
0.25
0.5
2011, February, Rev. 01