CAT1832 Datasheet PDF - Catalyst Semiconductor

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CAT1832
Catalyst Semiconductor

Part Number CAT1832
Description (CAT1232LP / CAT1832) 5V AND 3.3V SUPPLY VOLTAGE MONITOR AND RESET CIRCUIT
Page 12 Pages


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CAT1232LP/CAT1832
5V and 3.3V Supply Monitor, Watchdog Timer,
Manual Reset, with Active High & Low Resets
FEATURES
DESCRIPTION
s Selectable reset voltage tolerance
— CAT1232LP for 5V supply
— CAT1832 for 3.3V supply
s Selectable watchdog period:
150ms, 600ms or 1.2 sec
s Two reset outputs
The CAT1232LP and CAT1832 microprocessor
supervisors can halt and restart a “hung-up” or “stalled”
microprocessor, restart a microprocessor after a power
failure, and debounce a manual/push-button micro-
processor reset switch. The devices are drop in
replacements for the Maxim/Dallas Semiconductor
DS1232LP and DS1832 supervisors
— Active high, push-pull reset output
— Active low, open-drain reset output
(CAT1232LP)
— Active low, push-pull reset output (CAT1832)
Precision reference and comparator circuits monitor the
5V or 3.3V system power supply voltage, VCC. During
power-up or when the power supply falls outside
selectable tolerance limits, both the RESET and RESET
become active. After the power supply voltage rises
s Debounced manual push-button reset
s Compact SOIC and MSOP packages
above the RESET threshold voltage, the reset signals
remain active for a minimum of 250ms, allowing the
power supply and system processor to stabilize. The
trip-point tolerance input, TOL, selects the trip level
APPLICATIONS
tolerance to be either 5% or 10% for the CAT1232LP 5V
supply and 10% or 20% for the CAT1832 3.3V supply.
s Microprocessor Systems
s Portable Equipment
Each device has a push-pull, active HIGH reset output.
Thewww.DataSheet4U.com CAT1232LP also has an open drain, active LOW
s Controllers
s Single Board Computers
reset output while the CAT1832 also has a push-pull,
active LOW reset output.
s Instrumentations
s Telecommunications
A debounced manual reset input activates the reset
outputs and holds them active for a minimum period of
250ms after being released.
For Ordering Information details, see page 11.
Also included is a watchdog timer to reset a
microprocessor that has stopped due to a software or
hardware failure. Three watchdog time-out periods are
selectable: 150ms, 600ms and 1.2sec. If the ST input is
not strobed low before the watchdog time out period
expires, the reset signals become active for a minimum
of 250ms.
FUNCTIONAL DIAGRAM
VCC
TOL
PBRST
TD
ST
VCC
40k
Tolerance Selection
Reference
+
Push Button Debounce
Watchdog Timebase Selection
Watchdog Transition Detector
Reset &
Watchdog Timer
(CAT1232LP)
RESET
RESET
RESET
(CAT1832)
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 25089, Rev. 0C



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CAT1232LP/CAT1832
PIN CONFIGURATION
8-Lead SOIC/MSOP/DIP
PBRST 1
TD 2
TOL 3
GND 4
8 VCC
7 ST
6 RESET
5 RESET
PIN DESCRIPTION
16-Lead SOIC
NC 1
PBRST 2
NC 3
TD 4
NC 5
TOL 6
NC 7
GND 8
16 NC
15 VCC
14 NC
13 ST
12 NC
11 RESET
10 NC
9 RESET
Pin Number
Pin Number
8-Lead Package 16-Lead Package
12
24
36
48
59
6 11
7 13
8 15
1, 3. 5, 7, 10, 12,
14, 16
Name
PBRST
TD
TOL
GND
RESET
RESET
ST
VCC
NC
Function
Debounced manual pushbutton reset input
Watchdog typical time delay selection:
a) tTD = 150ms for TD = GND
b) tTD = 600ms for TD = Open
c) tTD = 1200ms for TD = VCC
CAT1232LP TOL selects 5% (TOL = GND) or 10% (TOL = VCC) trip
point tolerance. CAT1832 TOL selects 10% (TOL = GND) or 20% TOL =
VCC) trip point tolerance.
Ground
Active HIGH reset output. RESET is active
1. If VCC falls below the reset voltage trip point
2. If PBRST is low
3. If ST is not strobed low before the timeout period set by TD expires.
4. During power-up.
Active LOW reset output. (See RESET)
Strobe Input
Power Supply
No internal connection
Doc. No. 25089, Rev. 0C
2
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice



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CAT1232LP/CAT1832
ABSOLUTE MAXIMUM RATINGS*
Voltage on VCC ....................................... -0.5V to 7.0V
Voltage on ST and TD ................. -0.5V to VCC + 0.5V
Voltage on PBRST, RESET
and RESET ............................ -0.5V to VCC + 0.5V
ELECTRICAL CHARACTERISTICS
Maximum Junction Temperature ...................... 125°C
Storage Temperature Range ............ -65°C to +150°C
Lead Soldering Temperature (10 sec) .............. 300°C
Operating Temperature Range ........... -40°C to +85°C
Unless otherwise stated, 1.0V VCC 5.5V and over the operating temperature range of -40°C to +85°C. All
voltages are referenced to ground.
Symbol Parameter
Conditions
Min Typ Max Units
VCC
ICC1
VIH
VIL
VCCTP
VCCTP
Supply Voltage
Supply Current
ST and PBRST Input High Level
VCC = 5.5V, CAT1232LP
VCC = 3.6V, CAT1832
(5)
(6)
ST and PBRST Input Low Level
VCC Trip Point (TOL = GND)
VCC Trip Point (TOL = VCC)
VCC = 5.5V, CAT1232LP
VCC = 3.6V, CAT1832
CAT1232LP
CAT1232LP
1.0
2
VCC - 0.4V
0.3
4.50
4.25
35
20
4.62
4.37
5.5
50
35
VCC + 0.3V
0.8
0.5
4.74
4.49
V
µA
V
V
V
V
VCCTP VCC Trip Point (TOL = GND)
CAT1832
2.80 2.88 2.97 V
VCCTP
tTD
tTD
tTD
VOH
IOH
VCC Trip Point (TOL = VCC)
Watchdog Time-Out Period
Watchdog Time-Out Period
Watchdog Time-Out Period
Output Voltage
Output Current
CAT1832
TD = GND
TD = VCC
TD floating
I = 500µA(3)
Output = 2.4V(2)
2.47
62.5
500
250
VCC - 0.5V
2.55
150
1200
600
VCC - 0.1V
350
2.64
250
2000
1000
V
ms
ms
ms
V
µA
IOL Output Current
IIL Input Leakage
RPU Internal Pull-Up Resistor
CIN Input Capacitance
Output = 0.4V,
(1)
(1)
10
1.0
32
40
mA
1.0 µA
55 k
5 pF
COUT
tPB
Output Capacitance
PBRST Manual Reset
Minimum Low Time
PBRST = VIL
20
7 pF
ms
tRST
tST
tRPD
tF
tPDLY
tRPU
Reset Active Time
ST Pulse Width
VCC Fail Detect to
RESET or RESET
VCC Slew Rate
PBRST Stable LOW to
RESET and RESET Active
VCC Detect to RESET or
RESET Inactive
(4)
tRISE = 5µs
250
600
1000
ms
20
5
ns
8 µs
20 µs
20 ms
250
600
1000
ms
tR VCC Slew Rate
4.25V to 4.75V
Notes:
(1) PBRST is internally pulled HIGH to VCC through a nominal 40k
resistor (RPU).
(2) RESET is an open drain output on the CAT1232LP.
(3) RESET remains within 0.5V of VCC on power-down until VCC falls
below 2V. RESET remains within 0.5V of ground on power-down
until VCC falls below 2.0V.
0 ns
(4) Must not exceed the minimum watchdog time-out period (tTD).
The watchdog circuit cannot be disabled. To avoid a reset, ST
must be strobed.
(5) Measured with VCC 2.7V.
(6) Measured with VCC < 2.7V.
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. 25089, Rev. 0C



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CAT1232LP/CAT1832
TYPICAL CHARACTERISTICS
For the CAT1232LP, VCC = 5V and TAMB = 25°C unless otherwise stated.
Threshold Voltage vs. Temperature (10% TOL)
Threshold Voltage vs. Temperature (5% TOL)
4.450
4.630
4.445
4.440
TOL = Vcc (10%)
4.625
4.620
TOL = GND (5%)
4.435
4.615
4.430
-50
0 50
TEMPERATURE (°C)
100
Supply Current vs. Temperature
40
Vcc = 5.5V
30
20
Vcc = 4.5V
10
0
-50 0
50 100
TEMPERATURE (°C)
4.610
-50
0 50
TEMPERATURE (°C)
100
Reset Active Time vs. Temperature
800
700 TD = open
Vcc = 5.5V
600
500 Vcc = 4.5V
400
300
-50
0 50
TEMPERATURE (°C)
100
Reset Active Time Waveform
Transient Response
Doc. No. 25089, Rev. 0C
4
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice



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