CAT1832 Microprocessor Datasheet

CAT1832 Datasheet, PDF, Equivalent


Part Number

CAT1832

Description

Microprocessor

Manufacture

ON Semiconductor

Total Page 12 Pages
Datasheet
Download CAT1832 Datasheet


CAT1832
CAT1232LP, CAT1832
5 V and 3.3 V Supply Monitor, Watchdog Timer,
Manual Reset, with Active High & Low Resets
FEATURES
„ Selectable reset voltage tolerance
— CAT1232LP for 5 V supply
— CAT1832 for 3.3 V supply
„ Selectable watchdog period:
150 ms, 600 ms or 1.2 s
„ Two reset outputs
— Active high, push-pull reset output
— Active low, open-drain reset output
(CAT1232LP)
— Active low, push-pull reset output (CAT1832)
„ Debounced manual push-button reset
„ Compact SOIC and MSOP packages
For Ordering Information details, see page 11.
APPLICATIONS
„ Microprocessor Systems
„ Portable Equipment
„ Controllers
„ Single Board Computers
„ Instrumentations
„ Telecommunications
FUNCTIONAL DIAGRAM
VCC
TOL
PBRST
TD
ST
VCC
40k
Tolerance Selection
Reference
+
Push Button Debounce
Watchdog Timebase Selection
Watchdog Transition Detector
DESCRIPTION
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 microprocessor reset switch. The devices are
drop in replacements for the Maxim/Dallas
Semiconductor DS1232LP and DS1832 supervisors
Precision reference and comparator circuits monitor
the 5 V or 3.3 V system power supply voltage, VCC.
During power-up or when the power supply falls
outside selectable tolerance limits, both the RESET
and R¯¯E¯S¯E¯T¯ become active. After the power supply
voltage rises 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 tolerance to be either 5% or 10% for the
CAT1232LP 5 V supply and 10% or 20% for the
CAT1832 3.3 V supply.
Each device has a push-pull, active HIGH reset
output. The CAT1232LP also has an open drain,
active LOW reset output while the CAT1832 also has
a push-pull, active LOW reset output.
A debounced manual reset input activates the reset
outputs and holds them active for a minimum period of
250 ms after being released.
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: 150 ms, 600 ms and 1.2 s. If the S¯¯T input
is not strobed low before the watchdog time out period
expires, the reset signals become active for a
minimum of 250 ms.
RESET
(CAT1232LP)
Reset &
Watchdog Timer
RESET
RESET
(CAT1832)
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-3018 Rev. F

CAT1832
CAT1232LP, CAT1832
PIN CONFIGURATION
SOIC 8 Lead
MSOP 8 Lead
PDIP 8 Lead
P¯¯B¯R¯S¯T¯ 1
8 VCC
TD 2
7 S¯¯T
CAT
TOL 3
6 R¯¯E¯S¯E¯T¯
GND 4
5 RESET
PIN DESCRIPTION
SOIC 16 Lead
NC 1
16 NC
P¯¯B¯R¯S¯T¯ 2
15 VCC
NC 3
14 NC
TD 4
13 S¯¯T
CAT
NC 5
12 NC
TOL 6
11 R¯¯E¯S¯E¯T¯
NC 7
10 NC
GND 8
9 RESET
Pin Number
8-Lead
Package
1
2
3
4
5
6
7
8
Pin Number
16-Lead
Package
2
4
6
8
9
11
13
15
1, 3. 5, 7, 10,
12, 14, 16
Name
P¯¯B¯R¯S¯T¯
TD
TOL
GND
RESET
RESET
S¯¯T
VCC
NC
Function
Debounced manual pushbutton reset input
Watchdog typical time delay selection:
a) tTD = 150 ms for TD = GND
b) tTD = 600 ms for TD = Open
c) tTD = 1200 ms 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 P¯¯B¯R¯S¯T¯ is low
3. If S¯¯T 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
ABSOLUTE MAXIMUM RATINGS (*)
Parameters
Voltage on VCC
Voltage on S¯¯T and TD
Voltage on P¯¯B¯R¯S¯T¯,
R¯¯E¯S¯E¯T¯and RESET
Ratings
-0.5 to 7.0
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
Units
V
V
V
Parameters
Ratings Units
Maximum Junction Temperature 125 ºC
Storage Temperature Range
-65 to +150 ºC
Lead Soldering Temperature (10s) 300
ºC
Operating Temperature Range -40 to +85 ºC
Note:
* Stresses above 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 outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Doc. No. MD-3018 Rev. F
2 © 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice


Features CAT1232LP, CAT1832 5 V and 3.3 V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets FEATURES „ Selectable reset voltage tolerance — CAT1232LP for 5 V supply — CAT183 2 for 3.3 V supply „ Selectable watchd og period: 150 ms, 600 ms or 1.2 s „ T wo reset outputs — Active high, push- pull reset output — Active low, open- drain reset output (CAT1232LP) — Acti ve low, push-pull reset output (CAT1832 ) „ Debounced manual push-button reset „ Compact SOIC and MSOP packages For Ordering Information details, see page 11. APPLICATIONS „ Microprocessor Syst ems „ Portable Equipment „ Controller s „ Single Board Computers „ Instrume ntations „ Telecommunications FUNCTIO NAL DIAGRAM VCC TOL PBRST TD ST VCC 4 0kΩ Tolerance Selection Reference + – Push Button Debounce Watchdog Ti mebase Selection Watchdog Transition De tector DESCRIPTION The CAT1232LP and C AT1832 microprocessor supervisors can h alt and restart a “hung-up” or “stalled” microprocessor, restart a microprocessor after .
Keywords CAT1832, datasheet, pdf, ON Semiconductor, Microprocessor, AT1832, T1832, 1832, CAT183, CAT18, CAT1, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)