The ADM696/ADM697 supervisory circuits offer complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning.

The ADM696/ADM697 are available in 16-pin DIP and small outline packages and provide the following functions:

Power-On Reset output during power-up, power-down and brownout conditions. The RESET

voltage threshold is adjustable using an external voltage divider. The RESET output remains operational with V_CC as low as 1 V.

A Reset pulse if the optional watchdog timer has not been toggled within specified time.

Separate watchdog time-out and low line status outputs.

Adjustable reset and watchdog timeout periods.

A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than V_CC.

Battery backup switching for CMOS RAM, CMOS micro-processor or other low power logic (ADM696).

Write protection of CMOS RAM or EEPROM (ADM697).

The ADM696/ADM697 is fabricated using an advanced epitaxial CMOS process combining low power consumption (5 mW), extremely fast Chip Enable gating (5 ns) and high reliability. RESET assertion is guaranteed with V_CC as low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need for an external pass transistor.

Part#	Reset Threshold (V)	Min Reset Timeout (ms)	Reset Output-Stage	Backup-Battery Switch	Chip Enable Gating	Typ Watchdog Timeout (ms)	Package	Product Description	Price* (1000-4999)
ADM690	4.65	35	Active-Low/Push-Pull	Yes	---	100, 1,600	DIP	Supervisory Circuit w/ 4.65V Reset, Battery Switchover, Watchdog Timer, Power Fail Input	$2.39
ADM690A	4.65	140	Active-Low/Push-Pull	Yes	---	1,600	DIP, SOIC, SOP	µP Supervisor with Backup-Battery Switchover, Watchdog Feature, Power-Fail Warning, 4.65V Threshold	$1.50
ADM691	4.65	35 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC	Microprocessor Supervisor w/ Watchdog Timer, Reset Generator and Battery Steering	$2.70
ADM691A	4.65	140 (Adjustable)	Active-High/Open-Drain, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC, SOP	µP Supervisor with Battery Backup, Watchdog, Power Fail Indicator & Reset Generator	$1.66
ADM692	4.4	35	Active-Low/Push-Pull	Yes	---	100, 1,600, adj.	DIP	µP Supervisor with Backup Battery Switchover, Watchdog, Power Fail Warning, Reset Generator	$2.39
ADM692A	4.4	140	Active-Low/Push-Pull	Yes	---	1,600	DIP, SOIC	µP Supervisor w/ Battery Steering, Watchdog, Pwr Fail Warning, Active Low Reset, 250mA Iout	$1.66
ADM693	4.4	35 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC	µP Supervisor with Backup Battery Switchover, Watchdog, Pwr Fail Warning, 4.4V Threshold, 100mA	$2.70
ADM693A	4.4	140 (Adjustable)	Active-High/Open-Drain, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC	µP Supervisor w/ Backup Battery Switchover, Watchdog, Pwr Fail Warning, 4.4V Threshold, 250mA Iout	$1.83
ADM694	4.65	140	Active-Low/Push-Pull	Yes	---	100, 1,600, adj.	DIP	µP Supervisor w/ Backup Battery Switching, Watchdog, Power Fail Flag, 4.65V Vth, 100mA Iout	$2.50
ADM695	4.65	140 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC	µP Supv w/ Backup Batt Ckt, Adj RST Period, Adj Watchdog Period, CE Inputs, 4.65V Vth, 100 mA Iout	$2.70
ADM696	1.3, Adjustable	35	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	---	100, 1,600, adj.	DIP, SOIC	µP Supv w/ Backup Battery Switchover, Adj Low Line V Monitor, Adj Watchdog Timer, 100 mA Iout	$2.60
ADM697	1.3, Adjustable	35	Active-High/Push-Pull, Active-Low/Push-Pull	No	Yes	100, 1,600, adj.	DIP, SOIC	µP Supv with CE Inputs, Adj Low Line V Monitor, Adj W-dog Timer, Low Line, Pwr Fail & W-dog Status	$2.60
ADM800	4.3, 4.55	140 (Adjustable)	Active-High/Open-Drain, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC	µP Supv w/ Backup Battery Switchover, Adj Reset &Watchdog Periods, CE Inputs, 4.4V/4.65V Threshold	$2.30
ADM802	4.4, 4.65	140	Active-Low/Push-Pull	Yes	---	1,600	DIP, SOIC	µP Supv w/ Backup Battery Switchover, Power Fail Flag, 4.4V/4.65V Threshold, 250mA Output Current	$2.20
ADM805	4.4, 4.65	140	Active-High/Push-Pull	Yes	---	1,600	DIP, SOIC	µP Supv w/ Backup Battery Switchover, Watchdog, Power Fail Flag, 4.4V/4.65V Threshold, 250mA Iout	$2.20
ADM8690	4.65	35	Active-Low/Push-Pull	Yes	---	100, 1,600	DIP, SOIC	uP Supv Ckt, Watchdog Timer, Backup Battery Switching, 4.65V Reset Trip Voltage, 8-Pin DIP & SOIC	$2.49
ADM8691	4.65	35 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC, SOP	µP Supv w/ Backup Batt Switch, Adj Reset Period, Adj Watchdog Period, 4.65V Trip point, 100 mA Iout	$2.98
ADM8692	4.4	35	Active-Low/Push-Pull	Yes	---	100, 1,600	DIP, SOIC	µP Supv w/ Backup Battery Switch, Watchdog, Power Fail Flag, 4.4V Vth, Active Low Reset, 100mA Iout	$2.69
ADM8693	4.4	35 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC, SOP	µP Supervisor w/ Backup Battery Switching, Watchdog, Pwr Fail Flag, 4.4V Vth, 100mA Iout	$2.69
ADM8694	4.65	140	Active-Low/Push-Pull	Yes	---	100, 1,600	DIP, SOIC	µP Supervisor w/ Backup Battery Switch, Watchdog, Pwr Fail Flag, 4.65V Vth, 100mA Iout	$2.69
ADM8695	4.65	140 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	Yes	100, 1,600, adj.	DIP, SOIC	µP Supervisor w/ Backup Battery Switch, Adj Reset Period, Adj Watchdog Period, 4.65V Trip Voltage	$2.16
ADM8696	1.3, Adjustable	35 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	Yes	---	100, 1,600, adj.	DIP, SOIC, SOP	µP Supv w/ Backup Batt Switch, Adj Low Line V Monitor, Adj Watchdog Timer, Pwr Fail& Watchdog Status	$2.69
ADM8697	1.3, Adjustable	35 (Adjustable)	Active-High/Push-Pull, Active-Low/Push-Pull	No	Yes	100, 1,600, adj.	DIP, SOIC, SOP	µP Supv w/ CE Inputs, Adj Low Line V Monitor, Adj Watchdog Timer; Low Line, Pwr Fail&Watchdog Status	$2.69

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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