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CAT1232, CAT1832
5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets
FEATURES
Selectable reset voltage tolerance -- CAT1232LP for 5V supply -- CAT1832 for 3.3V supply Selectable watchdog period: 150ms, 600ms or 1.2s 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.
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/pushbutton 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 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 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 5V supply and 10% or 20% for the CAT1832 3.3V 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 250ms 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: 150ms, 600ms and 1.2s. 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.
APPLICATIONS
Microprocessor Systems Portable Equipment Controllers Single Board Computers Instrumentations Telecommunications
FUNCTIONAL DIAGRAM
VCC TOL VCC Reference 40k PBRST TD ST Push Button Debounce Watchdog Timebase Selection Watchdog Transition Detector - Tolerance Selection +
RESET (CAT1232LP)
RESET RESET (CAT1832)
Reset & Watchdog Timer
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
1
Doc. No. MD-3018 Rev. D
CAT1232, CAT1832
PIN CONFIGURATION
SOIC 8 Lead MSOP 8 Lead PDIP 8 Lead
PBRST TD TOL GND 1 2 3 4 8 VCC ST RESET RESET
SOIC 16 Lead
NC PBRST NC TD NC TOL NC GND 1 2 3 4 5 6 7 8 16 15 14 NC VCC NC ST NC RESET NC RESET
CAT
7 6 5
CAT
13 12 11 10 9
PIN DESCRIPTION
Pin Number 8-Lead Package 1 2 Pin Number 16-Lead Package 2 4
Name PBRST TD
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
3 4
6 8
TOL GND
5
9
RESET
6 7 8
11 13 15 1, 3. 5, 7, 10, 12, 14, 16
RESET ST VCC NC
ABSOLUTE MAXIMUM RATINGS (*)
Parameters Voltage on VCC Voltage on ST and TD Voltage on PBRST, RESETand RESET Ratings -0.5 to 7.0 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 Units V V V Parameters Maximum Junction Temperature Storage Temperature Range Lead Soldering Temperature (10s) Operating Temperature Range Ratings 125 -65 to +150 300 -40 to +85 Units C C C C
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. D
2
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT1232, CAT1832
ELECTRICAL CHARACTERISTICS Unless otherwise stated, 1.0V - VCC - 5.5V and over the operating temperature range of -40C to +85C. All voltages are referenced to ground. Symbol Parameter VCC ICC1 VIH VIL VCCTP VCCTP VCCTP VCCTP tTD tTD tTD VOH IOH IOL IIL RPU CIN COUT tPB tRST tST tRPD tF tPDLY tRPU tR Supply Voltage Supply Current ST and PBRST Input High Level ST and PBRST Input Low Level VCC Trip Point (TOL = GND) VCC Trip Point (TOL = VCC) VCC Trip Point (TOL = GND) VCC Trip Point (TOL = VCC) 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 PBRST Manual Reset Minimum Low Time Reset Active Time ST Pulse Width VCC Fail Detect to RESET or RESET VCC = 5.5V, CAT1232LP VCC = 3.6V, CAT1832 (5) (6) VCC = 5.5V, CAT1232LP VCC = 3.6V, CAT1832 CAT1232LP CAT1232LP CAT1832 CAT1832 TD = GND TD = VCC TD floating I = -500A
(3) (2)
Conditions
Min 1.0
Typ 35 20
Max 5.5 50 35 VCC + 0.3V 0.8 0.5
Units V A V V V V V V ms ms ms V A mA
2 VCC - 0.4V -0.3 4.50 4.25 2.80 2.47 62.5 500 250 VCC -0.5V 10 -1.0 32 40 4.62 4.37 2.88 2.55 150 1200 600 VCC -0.1V -350
4.74 4.49 2.97 2.64 250 2000 1000
Output = 2.4V Output = 0.4V, (1) (1)
1.0 55 5 7
A k pF pF ms
PBRST = VIL (4)
20 250 20 5 20 20 250 0 600 1000 8 600 1000
ms ns s s ms ms ns
VCC Slew Rate PBRST Stable LOW to RESET and RESET Active VCC Detect to RESET or tRISE = 5s RESET Inactive 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. (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.
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
3
Doc. No. MD-3018 Rev. D
CAT1232, CAT1832
TYPICAL CHARACTERISTICS
For the CAT1232LP, VCC = 5V and TAMB = 25C unless otherwise stated. Threshold Voltage vs. Temperature (10% TOL)
4.450
THRESHOLD VOLTAGE (V)
Threshold Voltage vs. Temperature (5% TOL)
4.630
THRESHOLD VOLTAGE (V)
4.445 TOL = Vcc (10%) 4.440
4.625 TOL = GND (5%) 4.620
4.435
4.615
4.430 -50
4.610
0
50
100
-50
0
50
100
TEMPERATURE (C)
TEMPERATURE (C)
Supply Current vs. Temperature
40
Reset Active Time vs. Temperature
800
RESET ACTIVE TIME (ms)
Vcc = 5.5V
SUPPLY CURRENT (mA)
30 Vcc = 4.5V 20
700 Vcc = 5.5V 600 Vcc = 4.5V
TD = open
500
10
400
0 -50
0
50
100
300 -50
0
50
100
TEMPERATURE (C)
TEMPERATURE (C)
Reset Active Time Waveform
Transient Response
Doc. No. MD-3018 Rev. D
4
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT1232, 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 10k to 50k. 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 RESETremain 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 4.25 4.50 2.47 2.80 NOMINAL 4.37 4.62 2.55 2.88 MAX 4.49 4.74 2.64 2.97
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 40k resistor. When PBRST is held low for the minimum time of 20ms, 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 40k resistor. PBRST can be driven from a TTL or CMOS logic line or short-ed to ground with a mechanical switch.
Figure 1. Timing Diagram: Power Up
Figure 2. Timing Diagram: Power Down
VCC tF VCCTP(MAX) VCCTP
tR VCCTP VCCTP(MAX)
VCCTP(MIN)
VCCTP(MIN)
VCC
tRPU VOH
RESET
RESET
tRPD
VOL
RESET
RESET
VOH VOL
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
5
Doc. No. MD-3018 Rev. D
CAT1232, CAT1832
WATCHDOG TIMER AND ST INPUT A watchdog timer stops and restarts a microprocessor that has stopped proper operation or become "hung". The watchdog performs this function by monitoring the ST input. After the reset outputs go inactive the ST input must be strobed with a high-to-low signal transition prior to the minimum watchdog timeout period. However if the ST input is not strobed with a high-to-low signal transition prior to a watchdog timeout the reset outputs will become active for TRST reseting and restarting the microprocessor. Once the resets return to the inactive state the watchdog timer restarts the process. The TD input allows the user to select from three predetermined watchdog timeout periods. Always use the minimum timeout period to determine the required frequency of ST high-to-low transitions and the maximum to determine the time prior to the reset outputs becoming active. ST pulse widths must be 20ns or greater. The watchdog timer cannot be disabled. It must be strobed with a high-to-low signal transition to avoid a watchdog timeout and subsequent reset.
CAT1232LP 1 2 3 4 PBRST TD TOL GND VCC ST RESET RESET 8 7 6 5 10k 5V MREQ P RESET Address Bus Decoder
TD Voltage Level GND Floating VCC
Watchdog Time-out Period (ms) MIN 62.5 250 500 NOMINAL 150 600 1200
3.3V CAT1832
MAX 250 1000 2000
1 2 3 4
PBRST TD TOL GND
VCC ST RESET RESET
8 7 6 5 I/O
P
RESET
Figure 4. CAT1832 Application Circuit: Pushbutton Reset
Figure 5. CAT1232LP Application Circuit: Watchdog Timer
PBRST VIL
tPB tPDLY VIH
ST
Valid Strobe tST
Valid Strobe
Invalid Strobe
tRST RESET RESET
RESET
tRST
tTD (Min)
tTD (Min)
VOH VOL
RESET Note: ST is ignored whenever a reset is active
Figure 6. Timing Diagram: Pushbutton Reset
Figure 7. Timing Diagram: Strobe Input
Doc. No. MD-3018 Rev. D
6
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT1232, CAT1832
PACKAGE OUTLINE DRAWINGS
SOIC 16-Lead 300mils (W) (1)(2)
D
SYMBOL
MIN
NOM
MAX
A A1 b c D
E1 E
2.36 0.10 0.33 0.18 10.08 10.01 7.39 0.25 0.38 0
2.49 0.41 0.23 10.31 10.31 7.49 1.27 BSC
2.64 0.30 0.51 0.28 10.49 10.64 7.59 0.75
E E1 e h L
0.81
1.27 8
PIN #1 IDENTIFICATION TOP VIEW
h A
c
L
b
e
A1
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf.
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-013.
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
7
Doc. No. MD-3018 Rev. D
CAT1232, CAT1832
PDIP 8-Lead 300mils (L) (1)(2)
SYMBOL MIN NOM MAX
A A1 A2 b
E1
5.33 0.38 2.92 0.36 1.14 0.20 9.02 7.62 6.10 7.87 2.92 3.30 3.30 0.46 1.52 0.25 9.27 7.87 2.54 BSC 6.35 7.11 10.92 3.80 4.95 0.56 1.78 0.36 10.16 8.25
b2 c D E e E1 eB
PIN # 1 IDENTIFICATION D
L
TOP VIEW
E
A
A2
A1 b2 L c
e SIDE VIEW
b
eB
END VIEW
For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf.
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MS-001.
Doc. No. MD-3018 Rev. D
8
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT1232, CAT1832
MSOP 8-Lead (Z)
(1)(2)
SYMBOL
MIN
NOM
MAX
A A1 A2 b c D
E E1
1.10 0.05 0.75 0.22 0.13 2.90 4.80 2.90 0.40 3.00 4.90 3.00 0.65 BSC 0.60 0.95 REF 0.25 BSC 0 6 0.80 0.10 0.85 0.15 0.95 0.38 0.23 3.10 5.00 3.10
E E1 e L L1 L2
TOP VIEW
D
A
A2
DETAIL A
A1
e SIDE VIEW
b
c END VIEW
L2 L L1 DETAIL A
For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf.
Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-187.
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
9
Doc. No. MD-3018 Rev. D
CAT1232, CAT1832
SOIC 8-Lead 150mils (W)
(1)(2)
SYMBOL
MIN
NOM
MAX
A A1 b c
E1 E
1.35 0.10 0.33 0.19 4.80 5.80 3.80 1.27 BSC 0.25 0.40 0
1.75 0.25 0.51 0.25 5.00 6.20 4.00 0.50 1.27 8
D E E1 e h L
PIN # 1 IDENTIFICATION TOP VIEW
D
h
A1
A
c
e
b
L END VIEW
SIDE VIEW
For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf.
Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012.
Doc. No. MD-3018 Rev. D
10
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT1232, CAT1832
EXAMPLE OF ORDERING INFORMATION (1)
Prefix
CAT
Device # Suffix
1232LP V -G T3
Company ID Product Number 1232LP 1832
Package L: PDIP V: SOIC 8-Lead W: SOIC 16-Lead (5) Z: MSOP
Lead Finish Blank: Matte-Tin G: NiPdAu
Tape & Reel T: Tape & Reel 3: 3000/Reel
ORDERING PART NUMBER CAT1232LPL-G CAT1232LPV-GT3 CAT1232LPZ-GT3 CAT1232LPW-T2 CAT1832L-G CAT1832V-GT3 CAT1832Z-GT3
Package 8-lead, DIP 8-lead, SOIC MSOP 16-lead, SOIC 8-lead, DIP 8-lead, SOIC MSOP
Parts per Tube 50 -- -- -- 50 -- --
Parts Per Reel -- 3,000 3,000 2,000 -- 3,000 3,000
Reel Size (inch) -- 13 13 13 -- 13 13
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 8-Lead, NiPdAu, Tape & Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. (5) The SOIC 16-Lead package is only available in Matte-Tin finish.
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
11
Doc. No. MD-3018 Rev. D
REVISION HISTORY
Date 06/13/2005 07/26/2005 03/27/2006 11/27/2006 Rev. 00 0A 0B 0C Comments Initial Issue Update Electrical Characteristics Add Typical Characteristics Update Document Title Update Ordering Information Add Ordering Information detail to page 1 Update Sample of Ordering Information Update Package Outline Drawings Update Example of Ordering Information Change document number from 25088, Rev. OC
11/13/2007
D
Copyrights, Trademarks and Patents (c) Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive AnalogTM, Beyond MemoryTM, DPPTM, EZDimTM, LDDTM, MiniPotTM, Quad-ModeTM and Quantum Charge ProgrammableTM Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com
Document No: MD-3018 Revision: D Issue date: 11/13/07

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