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PDF CAT1232LP Data sheet ( Hoja de datos )
| Número de pieza | CAT1232LP | |
| Descripción | (CAT1232LP / CAT1832) 5V AND 3.3V SUPPLY VOLTAGE MONITOR AND RESET CIRCUIT | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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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
40kΩ
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
1 page  
CAT1232LP/CAT1832
APPLICATION INFORMATION
SUPPLY VOLTAGE MONITOR
Reset Signal Polarity and Output Stage Structure
RESET is an active LOW signal. It is developed with an
open drain driver in the CAT1232LP. A pull-up resistor
is required, typical values are 10kΩ to 50kΩ. The
CAT1832 uses a CMOS push-pull output stage for the
RESET.
RESET is an active High signal developed by a CMOS
push-pull output stage and is the logical opposite to
RESET.
Trip Point Tolerance Selection
The TOL input is used to select the VCC trip point
threshold. This selection is made connecting the TOL
input to ground or VCC. Connecting TOL to Ground
makes the VCC trip threshold 4.62V for the CAT1232LP
and 2.88V for the CAT1832.
Connecting TOL to VCC makes the VCC trip threshold
4.37V for the CAT1232LP and 2.55V for the CAT1832.
After VCC has risen above the trip point set by TOL,
RESET and RESET remain active for a minimum time
period of 250ms.
On power-down, once VCC falls below the reset threshold
the RESET outputs will remain active and are guaranteed
valid down to a VCC level of 1.0V.
Tolerance
Select
Voltage
CAT1232LP
TOL = VCC
CAT1232LP
TOL = GND
CAT1832
TOL = VCC
CAT1832
TOL = GND
Trip Point
Tolerance
10 %
5%
20 %
10 %
Trip Point Voltage (V)
MIN NOMINAL MAX
4.25 4.37 4.49
4.50 4.62 4.74
2.47 2.55 2.64
2.80 2.88 2.97
VCC
VCCTP(MIN)
tR
VCVCCTCPTP(MAX)
tRPU
VCC
VCCTP(MAX)
VCCTP
tF
VCCTP(MIN)
RESET
VOH
RESET
tRPD
VOL RESET
Figure 1. Timing Diagram: Power Up
RESET
VOH
VOL
Figure 2. Timing Diagram: Power Down
Manual Reset Operation
Push-button input, PBRST, allows the user to issue
reset signals. The pushbutton input is debounced and is
pulled high through an internal 40kΩ resistor.
When PBRST is held low for the minimum time of 20 ms,
both resets become active and remain active for a
minimum time period of 250ms after PBRST returns
high.
No external pull-up resistor is required, since PBRST is
pulled high by an internal 40kΩ resistor.
PBRST can be driven from a TTL or CMOS logic line or
short-ed to ground with a mechanical switch.
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 25089, Rev. 0C
5 Page 
SAMPLE OF ORDERING INFORMATION
Prefix Device #
CAT
1232LP
Suffix
V
CAT1232LP/CAT1832
–G
T3
Company ID
Product Number
1232 LP
1832
T: Tape & Reel
2: 2000/Reel
3: 3000/Reel
Package
L: PDIP (Lead-free, Halogen-free)
V: SOIC 8-Lead (Lead-free, Halogen-free)
W: SOIC 16-Lead (Lead-free, Halogen-free)
Z: MSOP (Lead-free, Halogen-free)
Lead Finish
Blank: Matte-Tin
G: NiPdAu
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) The device used in the above example is a CAT1232LPV-GT3 (SOIC, NiPdAu, Tape & Reel).
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Green NiPdAu Lead Finish
Ordering Part Number
CAT1232LPL-G
CAT1232LPV-GT3
CAT1232LPZ-GT3
CAT1232LPW-GT2
CAT1832L-G
CAT1832V-GT3
CAT1832Z-GT3
Package
8-lead, DIP
8-lead, SOIC
MSOP
16-lead, SOIC
Parts per Tube
50
—
—
—
Parts Per Reel
—
3,000
3,000
2,000
Reel Size (inch)
—
13
13
13
8-lead, DIP
8-lead, SOIC
MSOP
50
—
—
—
3,000
3,000
—
13
13
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 25089, Rev. 0C
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAT1232LP.PDF ] | |
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