IL1232D [IKSEMICON]
POWER SUPPLY CONTROL WITH BUILT-IN WATCHDOG TIMER; 借助内置的看门狗定时器电源控制
| 型号： | IL1232D |
| 厂家： | 
IK SEMICON CO., LTD |
| 描述： | POWER SUPPLY CONTROL WITH BUILT-IN WATCHDOG TIMER |
| 文件： | 总7页 (文件大小：309K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
ORDERING INFORMATION
• 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.
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 ST
Functions:
TD 02
TOL 03
GND 04
• Reset signal generation after power failure/ error
• Reset signal generation from external “RESET” pushbutton
• Reset signal generation from watchdog timer
06 RST
05 RST
Fig 1 – PIN ASSIGNMENT
Table 1 – Absolute maximum ratings
Typical
Symbol
VСС
Parameter
Supply voltage
Units
Max
Min
-
7.0
V
VIH
VIL
ТA
Input voltage, high level
Input voltage, low level
Operating temperature range
-
7.0
-
V
V
-1.0
-40
+85
°С
Tstg
Storage temperature
-60
+125
°С
1
IN1232
Table 2 – Recommended operating conditions
Typical
Symbol
VСС
Parameter
Supply voltage
Units
Min
4.5
Max
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
V
V
+70
°С
Table 3 DC electrical characteristics (TAmb = -40° to +85°С)
Typical
Units
Symbol
ILIL1
Parameter
Test conditions
min
-
max
-1
VCC=5 V±10%,
VIL=0 V
µА
Input leakage current,
low level, ST, TOL
ILIL2
ILIL3
ILIH1
ILIH2
IOH
-
-300
VCC=5 V±10%,
VIL=0 V
µА
µА
µА
µА
µА
mА
V
Input leakage current,
low level, TD
-
-1000
VCC=5 V±10%,
VIL=0 V
Input leakage current,
low level, PBRST
-
1
VCC =5 V±10%,
VIH=VCC
Input leakage current,
high level, ST, TOL
-
300
VCC =5 V±10%,
VIH=VCC
Input leakage current,
high level, TD
-8
-
-
VCC =5 V±10%,
VOH=2.4 V
Output current, high
level, RST
IOL
8
VCC =5 V±10%,
VOL=0.4 V
Output current, low
level, RST, RST
VOH
VOH1
VOL
VСС-0.5
VСС-0.5
-
-
VCC =5 V±10%,
IOH= -500 µА
Output voltage, high
level, RST
VCC =2 V,
IOH= -500 µА
-
V
Output voltage, high
level,- RST
VCC =2 V,
IOL=1 mА
0.4
V
Output voltage, low level,
RST
Operating current
IСС
-
2
mА
V
VCC =5 V±10%
TOL = GND
TOL = VCC
VCC TP1
VCC TP2
VCC trip point
VCC trip point
4.5
4.25
4.74
4.49
V
2
IN1232
Table 4 – AC electrical characteristics (Тamb = from -40 to +85 °С)
Typical
Units
Symbol
tTD1
Parameter
Test conditions
min
max
250
Watchdog timer overflow
time
62.5
VCC =5.0 V±10%
tST≥20 ns
ms
TD = GND
tTD2
tTD3
tPDLY
TD disconnected
250
500
1000
2000
ms
ms
ms
TD = VCC
PBRST stable low to RST
and RST
VCC =5.0 V±10%
tPB≥20 ms
-
250
-
20
Reset active time
ms
VCC =5.0 V±10%
tPB≥20 ms
VCC =from 5.0 to
4.0 V
tRST
1000
175
VCC fail detect to RST and
RST
µs
tRPD
tF≥10 µs
VCC detect to RST and RST
transition
VCC = from 5.0 to
4.0 V
ms
tRPU
250
1000
tR≥1 µs
Table 5 – Pin description
Pin
01
Symbol
PBRST
Description
Pushbutton reset input
02
03
04
05
06
07
08
TD
TOL
GND
RST
RST
ST
Time Delay Set
Selects 5% or 10% VCC Detect
Ground
Reset output (Active High)
Reset output (Active Low, open drain)
Strobe Input
VCC
Supply output from voltage source
3
IN1232
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
Invalid strob
Valid strob
Indeterminate strob
___
ST
MAX
MIN
t 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
4
IN1232
tF
4.75 V
4.5 V
VCC
4.25 V
____
RST
tRPD
VOH
tF ≥10 µs
VOL
tRPD ≤175 µs
RST
Fig. 4 – Timing diagram: power error / down to VCCTP
tR
4.75 V
VCCTP
4.25 V
tRPU
VCC
RST
RST
VOH
VOL
tR ≥1 µs
250 ms≤ tRPU ≤1000 ms
Fig. 5 – Timing diagram: Power-Up/ Stable
5
IN1232
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
6
IN1232
N SUFFIX PLASTIC DIP
(MS – 001BA)
A
Dimension, mm
5
4
8
1
Symbol
MIN
8.51
6.1
MAX
10.16
7.11
B
A
B
C
D
F
5.33
F
L
0.36
1.14
0.56
C
1.78
SEATING
PLANE
-T-
K
2.54
7.62
G
H
J
N
M
J
G
H
D
0°
10°
3.81
8.26
0.36
0.25 (0.010) M
T
2.92
7.62
0.2
K
L
M
N
NOTES:
1. Dimensions “A”, “B” do not include mold flash or
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
0.38
D SUFFIX SOIC
(MS - 012AA)
Dimension, mm
A
8
5
Symbol
MIN
4.8
MAX
5
A
B
C
D
F
B
H
P
3.8
4
1.35
0.33
0.4
1.75
0.51
1.27
1
4
G
R x 45
C
-T-
SEATING
PLANE
1.27
5.72
G
H
J
K
M
D
J
F
M
0.25 (0.010) M T C
0°
8°
0.1
0.25
0.25
6.2
K
M
P
NOTES:
0.19
5.8
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
0.25
0.5
R
for A; for B 0.25 mm (0.010) per side.
‑
7
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