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ADM708

Analog Devices
Part Number ADM708
Manufacturer Analog Devices
Description Low Cost Microprocessor Supervisory Circuits
Published Jun 8, 2014
Detailed Description Data Sheet Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708 FEATURES Guaranteed RESET valid wi...
Datasheet PDF File ADM708 PDF File

ADM708
ADM708

Overview
Data Sheet Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708 FEATURES Guaranteed RESET valid with VCC = 1 V 190 μA quiescent current Precision supply voltage monitor 4.
65 V (ADM705/ADM707) 4.
40 V (ADM706/ADM708) 200 ms reset pulse width Debounced TTL/CMOS manual reset input (MR) Independent watchdog timer (ADM705/ADM706) 1.
60 sec timeout (ADM705/ADM706) Active high reset output (ADM707/ADM708) Voltage monitor for power fail or low battery warning Superior upgrade for MAX705 to MAX708 APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Critical microprocessor supply monitoring GENERAL DESCRIPTION The ADM705/ADM706/ADM707/ADM708 microprocessor supervisory circuits are suitable for monitoring 5 V power supplies/batteries and microprocessor activity.
The ADM705/ADM706 provide power-supply monitoring circuitry that generate a reset output during power-up, powerdown, and brownout conditions.
The reset output remains operational with VCC as low as 1 V.
Independent watchdog monitoring circuitry is also provided.
This is activated if the watchdog input has not been toggled within 1.
60 sec.
In addition, there is a 1.
25 V threshold detector to warn of power failures, to detect low battery conditions, or to monitor an additional power supply.
An active low, debounced manual reset input (MR) is also included.
00088-001 FUNCTIONAL BLOCK DIAGRAMS WATCHDOG INPUT (WDI) WATCHDOG TRANSITION DETECTOR WATCHDOG TIMER WATCHDOG OUTPUT (WDO) VCC MR VCC POWER-FAIL INPUT (PFI) 250μA 4.
65V* 1.
25V RESET AND WATCHDOG TIMEBASE RESET GENERATOR ADM705/ ADM706 RESET POWER-FAIL OUTPUT (PFO) *VOLTAGE REFERENCE = 4.
65V (ADM705), 4.
40V (ADM706) Figure 1.
ADM705/ADM706 MR VCC POWER-FAIL INPUT (PFI) VCC 250μA 4.
65V* 1.
25V RESET GENERATOR ADM707/ ADM708 RESET RESET POWER-FAIL OUTPUT (PFO) * VOLTAGE REFERENCE = 4.
65V (ADM707), 4.
40V (ADM708) Figure 2.
ADM707/ADM708 00088-002 The ADM705 and ADM706 are identical except for the reset thr...


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