cat1232 Catalyst Semiconductor, cat1232 Datasheet - Page 3

• Manufacturer Part Number: cat1232
• Description: 5v And 3.3v Supply Monitor, Watchdog Timer, Manual Reset, With Active High & Low Resets
• Manufacturer: Catalyst Semiconductor

ELECTRICAL CHARACTERISTICS
Unless otherwise stated, 1.0V - V
voltages are referenced to ground.
Notes:
(1) PBRST
(2) RESET
(3) RESET remains within 0.5V of V
(4) Must not exceed the minimum watchdog time-out period (t
(5) Measured with V
(6) Measured with V
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Symbol Parameter
V
V
V
V
C
t
¯¯¯¯¯¯ is internally pulled HIGH to V
¯¯¯¯¯¯ is an open drain output on the CAT1232LP.
V
strobed.
R
t
t
V
I
t
V
PDLY
V
t
I
C
CC1
V
I
RST
RPD
RPU
CCTP
CCTP
CCTP
CCTP
t
t
t
t
I
CC
TD
OL
t
TD
TD
OH
OUT
PB
t
ST
CC
IL
PU
OH
F
R
IH
IL
IN
falls below 2.0V.
Supply Voltage
Supply Current
ST and PBRST
Level
ST and PBRST
Level
V
V
V
V
Watchdog Time-Out Period
Watchdog Time-Out Period
Watchdog Time-Out Period
Output Voltage
Output Current
Output Current
Input Leakage
Internal Pull-Up Resistor
Input Capacitance
Output Capacitance
¯¯¯¯¯¯ Manual Reset
PBRST
Minimum Low Time
Reset Active Time
ST
V
¯¯¯¯¯¯
RESET
V
¯¯¯¯¯¯ Stable LOW to RESET
PBRST
and RESET
V
¯¯¯¯¯¯ Inactive
RESET
V
¯¯ Pulse Width
CC
CC
CC
CC
CC
CC
CC
CC
Trip Point (TOL = GND)
Trip Point (TOL = V
Trip Point (TOL = GND)
Trip Point (TOL = V
Fail Detect to RESET or
Slew Rate
Detect to RESET or
Slew Rate
¯¯¯¯¯¯ Active
CC
CC
• 2.7V.
< 2.7V.
¯¯¯¯¯¯ Input High
¯¯¯¯¯¯ Input Low
CC
on power-down until V
CC
through a nominal 40kŸ resistor (RPU).
CC
CC
CC
)
)
- 5.5V and over the operating temperature range of -40ºC to +85ºC. All
Conditions
V
V
(5)
(6)
V
V
CAT1232LP
CAT1232LP
CAT1832
CAT1832
Output = 2.4V
Output = 0.4V,
PBRST
(4)
t
4.25V to 4.75V
TD = GND
TD = V
TD floating
I = -500µA
(1)
(1)
¯¯¯¯¯¯ = V
RISE
CC
CC
CC
CC
= 5.5V, CAT1232LP
= 3.6V, CAT1832
= 5.5V, CAT1232LP
= 3.6V, CAT1832
= 5µs
CC
CC
TD
falls below 2V. RESET remains within 0.5V of ground on power-down until
). The watchdog circuit cannot be disabled. To avoid a reset, ST
(3)
IL
3
(2)
V
V
CC
CC
4.50
2.80
4.25
2.47
62.5
-0.3
-1.0
Min
500
250
250
250
1.0
32
20
20
10
20
- 0.4V
2
-0.5V
0
V
CC
1200
4.62
2.88
-350
4.37
2.55
Typ
150
600
600
600
40
35
20
-0.1V
5
CAT1232, CAT1832
V
CC
Doc. No. MD-3018 Rev. D
2000
1000
1000
1000
Max
4.74
4.49
2.97
2.64
250
5.5
0.8
0.5
1.0
50
35
55
20
+ 0.3V
5
7
8
¯¯ must be
Units
mA
ms
ms
ms
kŸ
ms
ms
ms
ms
µA
µA
µA
pF
pF
ns
µs
µs
ns
V
V
V
V
V
V
V
V