Microprocessor Supervisory Circuit ADM1232 APPLICATIONS FUNCTIONAL BLOCK DIAGRAM VCC TOLERANCE 5%/10% TOLERANCE SELECT VREF PB RESET DEBOUNCE TD WATCHDOG TIME-BASE SELECT RESET RESET WATCHDOG TIMER STROBE 07522-001 Pin-compatible with MAX1232 and Dallas DS1232 Adjustable precision voltage monitor with 4.5 V and 4.75 V options Adjustable strobe monitor with 150 ms, 600 ms, or 1.2 sec options No external components Specified from −40°C to +85°C RESET GENERATOR FEATURES ADM1232 GND Figure 1. Microprocessor systems Portable equipment Computers Controllers Intelligent instruments Automotive systems GENERAL DESCRIPTION 5V The ADM1232 is pin-compatible with the MAX1232, DS1232LP, and DS1232. The Analog Devices, Inc., ADM1232 is a microprocessor monitoring circuit that can monitor the following: Microprocessor supply voltage Whether a microprocessor has locked up External interrupts The ADM1232 is available in four packages: an 8-lead MSOP (RM-8), an 8-lead PDIP (N-8), a 16-lead wide SOIC (RW-16), and an 8-lead narrow SOIC (R-8). 10kΩ ADM1232 STROBE RESET GND MICROPROCESSOR I/O RESET TD TOLERANCE 07522-002 • • • 5V Figure 2. Typical Supply Monitoring Application Rev. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1997–2008 Analog Devices, Inc. All rights reserved. ADM1232 TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configurations and Function Descriptions ............................5 Applications ....................................................................................... 1 Circuit Information ...........................................................................6 Functional Block Diagram .............................................................. 1 PB RESET .......................................................................................6 General Description ......................................................................... 1 STROBE Timeout Selection.........................................................6 Revision History ............................................................................... 2 Tolerance ........................................................................................6 Specifications..................................................................................... 3 RESET and RESET Outputs .........................................................6 Absolute Maximum Ratings............................................................ 4 Outline Dimensions ..........................................................................7 Thermal Resistance ...................................................................... 4 Ordering Guide .............................................................................9 ESD Caution .................................................................................. 4 REVISION HISTORY 12/08—Rev. B to Rev. C Updated Format .................................................................. Universal Changes to Table 2 ............................................................................ 4 Added Thermal Resistance Section ............................................... 4 Updated Outline Dimensions ......................................................... 7 Changes to Ordering Guide ............................................................ 9 12/97—Rev. A to Rev. B Changes to Specifications Section .................................................. 2 x/97—Rev. 0 to Rev. A Changes to Specifications Section .................................................. 2 7/97—Revision 0: Initial Version Rev. C | Page 2 of 12 ADM1232 SPECIFICATIONS VCC = full operating range, TA = TMIN to TMAX, unless otherwise noted. Table 1. Parameter TEMPERATURE POWER SUPPLY Voltage Current Min −40 Typ Max +85 Unit °C Test Conditions/Comments TA = TMIN to TMAX. 4.5 5.0 20 200 5.5 50 500 V μA μA VIL, VIH = CMOS levels. VIL, VIH = TTL levels. VCC + 0.3 +0.8 V V +1.0 1.6 μA μA STROBE AND PB RESET INPUTS Input High Level Input Low Level INPUT LEAKAGE CURRENT (STROBE, TOLERANCE) TD OUTPUT CURRENT RESET RESET/RESET 8 −8 10 −12 mA mA VCC is at 4.5 V to 5.5 V. VCC is at 4.5 V to 5.5 V. OUTPUT VOLTAGE RESET/RESET VCC − 0.5 VCC − 0.1 V When sourcing less than 500 μA, RESET remains within 0.5 V of VCC on power-down until VCC drops below 2.0 V. When sinking less than 500 μA, RESET remains within 0.5 V of GND on power-down until VCC drops below 2.0 V. RESET/RESET High Level RESET/RESET Low Level 2.0 −0.3 −1.0 0.4 2.4 1 V OPERATION RESET Output Voltage RESET Output Voltage VCC TRIP POINT 5% 10% CAPACITANCE Input (STROBE, TOLERANCE) Output (RESET, RESET) VCC − 0.1 0.1 4.5 4.25 4.62 4.37 V V V V When sourcing less than 50 μA. When sinking less than 50 μA. 4.74 4.49 V V TOLERANCE = GND. TOLERANCE = VCC. 5 7 pF pF TA = 25°C. TA = 25°C. ms PB RESET must be held low for a minimum of 20 ms to guarantee a reset. PB RESET Time 20 Delay RESET ACTIVE TIME 1 250 4 610 20 1000 ms ms 70 62.5 250 500 150 600 1200 250 1000 2000 ns ms ms ms STROBE Pulse Width Timeout Period VCC Fall Time Rise Time VCC FAIL DETECT TO RESET OUTPUT DELAY 10 0 250 610 50 1000 TD = 0 V. TD = floating. TD = VCC. μs μs Guaranteed by design. Guaranteed by design. RESET and RESET are logically correct. μs ms After VCC falls below the set tolerance voltage (see Figure 9). After VCC rises above the set tolerance voltage. Rev. C | Page 3 of 12 ADM1232 ABSOLUTE MAXIMUM RATINGS TA = 25°C unless otherwise noted. THERMAL RESISTANCE Table 2. θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Parameter VCC Logic Inputs Storage Temperature Range Lead Temperature (Soldering, 10 sec) Vapor Phase (60 sec) Infrared (15 sec) Power Dissipation N-81 RW-16, RM-82 R-82 1 2 Rating 5.5 V −0.3 V to VCC + 0.3 V −65°C to +150°C 300°C 215°C 220°C 1000 mW 900 mW 900 μW Table 3. Thermal Resistance Package Type 8-Lead PDIP (N-8) 16-Lead SOIC_W (RW-16) 8-Lead MSOP (RM-8) 8-Lead SOIC_N (R-8) ESD CAUTION Derate by 13.5 mW/°C above 25°C. Derate by 12 mW/°C above 25°C. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Rev. C | Page 4 of 12 θJA 100 73 206 153 Unit °C/W °C/W °C/W °C/W ADM1232 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS NC 1 16 NC PB RESET 2 TD 4 NC 5 ADM1232 14 NC 13 STROBE TOP VIEW (Not to Scale) 12 NC TOLERANCE 6 11 RESET NC 7 10 NC GND 8 9 RESET NC = NO CONNECT 07522-003 NC 3 15 VCC PB RESET 1 TD 2 ADM1232 TOLERANCE 3 TOP VIEW (Not to Scale) GND 4 8 VCC 7 STROBE 6 RESET 5 RESET 07522-004 Figure 3. RW-16 Pin Configuration PB RESET 1 TD 2 ADM1232 TOLERANCE 3 TOP VIEW (Not to Scale) GND 4 8 VCC 7 STROBE 6 RESET 5 RESET 07522-005 Figure 4. RM-8 Pin Configuration Figure 5. N-8 and R-8 Pin Configuration Table 4. Pin Function Descriptions Pin No. N-8, R-8, RM-8 RW-16 1, 3, 5, 7, 10, 12, 14, 16 2 1 Mnemonic NC Description No Connection. PB RESET 4 2 TD 6 3 TOLERANCE 8 9 4 5 GND RESET 11 13 6 7 RESET STROBE 15 8 VCC Push-Button Reset Input. This debounced input ignores pulses of less than 1 ms and is guaranteed to respond to pulses greater than 20 ms. Time Delay Set. This input allows the user to select the maximum amount of time that the ADM1232 allows the STROBE input to remain inactive—that is, STROBE is not receiving any high-to-low transitions—without forcing the ADM1232 to generate a RESET pulse. See the Specifications section, Figure 8, and the STROBE Timeout Selection section. Tolerance Input. This input determines how much the supply voltage is allowed to decrease (as a percentage) before a RESET is asserted. Connect this pin to VCC for 10% and to GND for 5%. 0 V Ground Reference for All Signals. Active High Logic Output. This pin is asserted when any of the following events occurs: VCC decreases below the amount specified by the TOLERANCE input; when PB RESET is forced low; if there are no high-to-low transitions within the limits set by TD at STROBE; and during power-up. Inverse of RESET. This pin has an open-drain output. The STROBE input is used to monitor the activity of a microprocessor. If there are no high-to-low transitions within the time specified by TD, a reset is asserted. Power Supply Input, 5 V. Rev. C | Page 5 of 12 ADM1232 CIRCUIT INFORMATION PB RESET STROBE TIMEOUT SELECTION The PB RESET input makes it possible to manually reset a system using either a standard push-button switch or a logic low input. An internal debounce circuit provides glitch immunity when used with a switch, reducing the effects of glitches on the line. The debounce circuit is guaranteed to cause the ADM1232 to assert a reset if PB RESET is brought low for more than 20 ms and is guaranteed to ignore low inputs of less than 1 ms. TD (time delay) set is used to set the strobe timeout period. The strobe timeout period is the maximum time between high-tolow transitions that STROBE accepts before a reset is asserted (see Figure 8). The strobe timeout settings are listed in Table 5. VCC VCC Min 62.5 250 500 Typ 150 600 1200 Max 250 1000 2000 Unit ms ms ms STROBE PULSE WIDTH MICROPROCESSOR STROBE RESET I/O STROBE RESET STROBE TIMEOUT PERIOD Figure 8. STROBE Parameters Figure 6. Typical Push-Button Reset Application VCC PB RESET TIME VIL 5V 4.5V (5% TRIP POINT) 5V 4.25V (10% TRIP POINT) VIH RESET OUTPUT DELAY WHEN VCC IS RISING RESET OUTPUT DELAY WHEN VCC IS FALLING RESET ACTIVE TIME RESET RESET 07522-009 PB RESET DELAY PB RESET 07522-008 TOLERANCE 07522-006 GND Condition TD = 0 V TD = Floating TD = VCC TD ADM1232 PB RESET Table 5. Strobe Timeout Settings 07522-007 RESET RESET Figure 7. PB RESET Figure 9. Reset Output Delay TOLERANCE The TOLERANCE input is used to determine the level at which VCC can vary below 5 V without the ADM1232 asserting a reset. Connecting TOLERANCE to GND selects a −5% tolerance level and causes the ADM1232 to generate a reset if VCC falls below 4.75 V. If TOLERANCE is connected to VCC, a −10% tolerance level is selected, which causes the ADM1232 to generate a reset if VCC falls below 4.5 V. See the parameters for the VCC trip point in the Specifications section for more information. RESET AND RESET OUTPUTS RESET is capable of sourcing and sinking current, whereas RESET is an open-drain MOSFET that sinks current only. Therefore, it is necessary to pull this output high. Rev. C | Page 6 of 12 ADM1232 OUTLINE DIMENSIONS 10.50 (0.4134) 10.10 (0.3976) 9 16 7.60 (0.2992) 7.40 (0.2913) 10.65 (0.4193) 10.00 (0.3937) 8 1.27 (0.0500) BSC 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 0.75 (0.0295) 0.25 (0.0098) 2.65 (0.1043) 2.35 (0.0925) SEATING PLANE 0.51 (0.0201) 0.31 (0.0122) 8° 0° 1.27 (0.0500) 0.40 (0.0157) 0.33 (0.0130) 0.20 (0.0079) COMPLIANT TO JEDEC STANDARDS MS-013- AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 10. 16-Lead Standard Small Outline Package [SOIC_W] Wide Body (RW-16) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5 5.15 4.90 4.65 4 PIN 1 0.65 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 45° 0.23 0.08 8° 0° SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 11. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev. C | Page 7 of 12 0.80 0.60 0.40 032707-B 1 ADM1232 0.400 (10.16) 0.365 (9.27) 0.355 (9.02) 8 5 1 4 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.100 (2.54) BSC 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.060 (1.52) MAX 0.210 (5.33) MAX 0.015 (0.38) MIN 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) SEATING PLANE 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.015 (0.38) GAUGE PLANE 0.430 (10.92) MAX 0.005 (0.13) MIN 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 070606-A COMPLIANT TO JEDEC STANDARDS MS-001 CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. Figure 12. 8-Lead Plastic Dual In-Line Package [PDIP] Narrow Body (N-8) Dimensions shown in inches and (millimeters) 5.00 (0.1968) 4.80 (0.1890) 8 1 5 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-A A CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 13. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) Rev. C | Page 8 of 12 012407-A 4.00 (0.1574) 3.80 (0.1497) ADM1232 ORDERING GUIDE Model ADM1232ARM ADM1232ARM-REEL ADM1232ARM-REEL7 ADM1232ARMZ 1 ADM1232ARMZ-REEL1 ADM1232ARMZ-REEL71 ADM1232AN ADM1232ANZ1 ADM1232ARW ADM1232ARW-REEL ADM1232ARW-REEL7 ADM1232ARWZ1 ADM1232ARWZ-REEL1 ADM1232ARWZ-REEL71 ADM1232ARN ADM1232ARN-REEL ADM1232ARN-REEL7 ADM1232ARNZ1 ADM1232ARNZ-REEL1 ADM1232ARNZ-REEL71 1 Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C Package Description 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Plastic Dual In-Line Package [PDIP] 8-Lead Plastic Dual In-Line Package [PDIP] 16-Lead Standard Small Outline Package [SOIC_W], Wide Body 16-Lead Standard Small Outline Package [SOIC_W], Wide Body 16-Lead Standard Small Outline Package [SOIC_W], Wide Body 16-Lead Standard Small Outline Package [SOIC_W], Wide Body 16-Lead Standard Small Outline Package [SOIC_W], Wide Body 16-Lead Standard Small Outline Package [SOIC_W], Wide Body 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] 8-Lead Standard Small Outline Package [SOIC_N] Z = RoHS Compliant Part. Rev. C | Page 9 of 12 Package Options RM-8 RM-8 RM-8 RM-8 RM-8 RM-8 N-8 N-8 RW-16 RW-16 RW-16 RW-16 RW-16 RW-16 R-8 R-8 R-8 R-8 R-8 R-8 Branding M2A M2A M2A M4W M4W M4W ADM1232 NOTES Rev. C | Page 10 of 12 ADM1232 NOTES Rev. C | Page 11 of 12 ADM1232 NOTES ©1997–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07522-0-12/08(C) Rev. C | Page 12 of 12