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Part: MAX6323
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: P Supervisory Circuits With Windowed (Min/Max) Watchdog And Manual Reset
Company: Maxim Integrated Products
Datasheet: Download MAX6323 datasheet File size : 384 kB
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Datasheet text preview:
19-1838; Rev 2; 2/03
µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset
General Description
The MAX6323/MAX6324 microprocessor (µP) supervisory circuits monitor power supplies and µP activity in digital systems. A watchdog timer looks for activity outs i d e an expected window of operation. Six lasert r i m m e d reset thresholds are available with ±2.5% accuracy from +2.32V to +4.63V. Valid RESET output is guaranteed down to VCC = +1.2V. The RESET output is either push-pull (MAX6323) or open-drain (MAX6324). RESET is asserted low when VCC falls below the reset threshold, or when the manual reset input (MR) is asserted low. RESET remains asserted for at least 100ms after VCC rises above the reset threshold and MR is deasserted. The watchdog pulse output (WDPO) utilizes an opendrain configuration. It can be triggered either by a fast timeout fault (watchdog input pulses are too close to each other) or a slow timeout fault (no watchdog input p u l s e is observed within the timeout period). The w a t c h d o g timeout is measured from the last falling edge of watchdog input (WDI) with a minimum pulse width of 300ns. WDPO is asserted for 1ms when a fault is observed. Eight laser-trimmed timeout periods are available. The MAX6323/MAX6324 are offered in a 6-pin SOT23 package and operate over the extended temperature range (-40°C to +125°C). o Min/Max (Windowed) Watchdog, 8 Factory-Trimmed Timing Options o Pulsed Open-Drain, Active-Low Watchdog Output o Power-On Reset o Precision Monitoring of +2.5V, +3.0V, +3.3V, and +5.0V Power Supplies o Open-Drain or Push-Pull RESET Outputs o Low-Power Operation (23µA typ) o Debounced Manual Reset Input o Guaranteed Reset Valid to VCC = +1.2V
Features
MAX6323/MAX6324
Ordering Information
PART* TEMP RANGE PINPACKAGE RESET OUTPUT
Applications
Automotive Industrial Medical Embedded Control Systems
MAX6323_UT_ _-T -40°C to +125°C 6 SOT23-6 Push-Pull MAX6324_UT_ _-T -40°C to +125°C 6 SOT23-6 Open Drain *These devices are factory trimmed to one of eight watchdogtimeout windows and one of six reset voltage thresholds. Insert the letter corresponding to the desired watchdog-timeout window (A, B, C, D, E, F, G, or H) into the blank following the number 6323 or 6324 (see Watchdog Timeout table). Insert the two-digit code (46, 44, 31, 29, 26, or 23) after the letters UT for the desired nominal reset threshold (see Reset Threshold Range table at end of data sheet). Note: There are eight standard versions of each device available (see Standard Versions table). Sample stock is generally held on standard versions only. Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces. Contact factory for availability of nonstandard versions.
Pin Configuration
TOP VIEW
MR 1 6 RESET
Watchdog Timeout
SUFFIX A B C D E F G H WATCHDOG TIMEOUT* FAST SLOW MAX MIN UNITS UNITS 1.5 ms 10 15 ms 100 ms 15 ms 300 15 ms 10 s 15 ms 60 23 ms 47 ms 39 ms 82 719 ms 1.3 s
GND 2
MAX6323 MAX6324
5
WDPO
WDI 3
4
VCC
SOT23 Typical Operating Circuit appears at end of data sheet.
*See Figure 1 for operation. 1
________________________________________________________________ Maxim Integrated Products
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µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset MAX6323/MAX6324
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC .........-0.3V to +6.0V MR, RESET (MAX6323), WDI ....-0.3V to (VCC + +0.3V) WDPO, RESET (MAX6324) ......-0.3V to +6.0V Input Current, VCC, WDI, MR ....20mA Output Current, RESET, WDPO .........20mA Rate of Rise, VCC ...100V/µs Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW Operating Temperature Range .......-40°C to +125°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = full range, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = 3V, TA = +25°C.) (Note 1) PARAMETER Operating Voltage Range Supply Current SYMBOL VCC ICC No load, RESET deasserted MAX632_ _UT46 MAX632_ _UT44 Reset Threshold Voltage VTH MAX632_ _UT31 MAX632_ _UT29 MAX632_ _UT26 MAX632_ _UT23 Reset Timeout Delay VCC to RESET Delay tRP RESET deasserted 10mV/ms, VTH +100mV to VTH -100mV ISINK = 1.2mA, VCC = 2.25V (MAX632_ _UT23, MAX632_ _UT26, MAX632_ _UT29, MAX632_ _UT31) WDPO, RESET Output Voltage VOL ISINK = 3.2mA, VCC = 4.25V (MAX632_ _UT44, MAX632_ _UT46) ISINK = 100µA, VCC > 1.2V, RESET asserted ISOURCE = 500µA, VCC = 3.15V, RESET deasserted (MAX632_ _UT23, MAX632_ _UT26, 0.8 x VCC MAX632_ _UT29, MAX632_ _UT31) ISOURCE = 800µA, VCC = 4.75V, RESET V - 1.5 deasserted, (MAX632_ _UT44, MAX632_ _UT46) CC ILKG V RESET = V WDPO = +5.5V, RESET, WDPO deasserted 1 µA VCC = 2.5V or 3.3V VCC = 5.5V 4.50 4.25 3.00 2.85 2.55 2.25 100 CONDITIONS MIN 1.2 23 27 4.63 4.38 3.08 2.93 2.63 2.32 180 20 0.4 V 0.4 0.4 TYP MAX 5.5 45 57 4.75 4.50 3.15 3.00 2.70 2.38 280 ms µs V UNITS V µA
RESET Output Voltage (MAX6323)
VOH
V
WDPO, RESET Output Leakage
2
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µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset
ELECTRICAL CHARACTERISTICS (continued)
(VCC = full range, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = 3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MAX632_AUT_ _ MAX632_BUT_ _ MAX632_CUT_ _ Watchdog Timeout (Fast) (Notes 2, 3) tWD1 MAX632_DUT_ _ MAX632_EUT_ _ MAX632_FUT_ _ MAX632_GUT_ _ MAX632_HUT_ _ MAX632_AUT_ _ MAX632_BUT_ _ MAX632_CUT_ _ Watchdog Timeout (Slow) (Note 4) tWD2 MAX632_DUT_ _ MAX632_EUT_ _ MAX632_FUT_ _ MAX632_GUT_ _ MAX632_HUT_ _ Minimum Watchdog Input Pulse Width WDI Glitch Immunity WDI Input Voltage WDI Input Current WDPO Pulse Width MANUAL RESET INPUT MR Input Voltage MR Minimum Pulse Width MR Glitch Immunity MR to Reset Delay MR Pullup Resistance VCC = 2.5V VCC = 2.5V 50 VIH VIL 1 100 120 85 0.7 x VCC 0.3 x VCC V µs ns ns k VIH VIL WDI = 0 WDI = VCC VIL = 0.8V, VIH = 0.75V x VCC 0.5 -1.5 -1 1 1 1.5 3 VCC = 5.5V 0.75 x VCC 0.8 MIN 1 10 10 10 10 17 29 543 10 100 300 10 60 47 82 1.3 300 100 TYP MAX 1.5 15 15 15 15 23 39 719 15 150 450 15 90 63 108 1.8 s ms s ns ns V µA ms ms ms UNITS WATCHDOG INPUT AND OUTPUT
MAX6323/MAX6324
3
Note 1: Devices are tested at TA = +25°C and guaranteed by design for TA = TMIN to TMAX, as specified. Note 2: WDPO will pulse low if a falling edge is detected on WDI before this timeout period expires. Note 3: To avoid a potential fake fault, the first WDI pulse after the rising edge of RESET or WDPO will not create a fast watchdog timeout fault. Note 4: WDPO will pulse low if no falling edge is detected on WDI after this timeout period expires.
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