MAX691 Microprocessor Supervisory Circuits Datasheet

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MAX691CPE - MAX691 Microprocessor Supervisory Circuits

Product Details

The MAX691 is a microprocessor monitor including a reset output for power up and down conditions, together with low voltage brownout reset. Battery backup switching is provided to switch to a back-up battery in power fail conditions. The MAX691 also includes a watchdog timer, to prevent program lockup. The device also provides status output signals for watchdog timeout, backup battery switchover and low voltage.

Features

Precision Voltage Monitor 4.65V
Power OK/Reset Time Delay
Watchdog Timer - 100ms, 1.6 sec, or Adjustable
Minimum Component Count
1µA Standby Current
Battery Backup Power Switching
Onboard Gating of Chip Enable Signals
Voltage Monitor for Power Fail or Low Battery Warning

Pin Layout

Pin Description

Pin Number	Description
1	Vbatt - Backup Battery Input
2	Vout - Vcc or Vbat Output, Depending on Voltage
3	Vcc - +5V Power Supply Input
4	GND - Ground
5	Batt On - Indicates Supply is from the Battery
6	Low Line - Indicates Power Supply Voltage is Low
7	OCS IN
8	OSC SEL
9	PFI - Power Fail Input
10	PFO - Power Fail Output
11	WDI - Watchdog Input
12	CE Out
13	CE In
14	WDO - Watchdog Output
15	RESET - Active High Reset
16	RESET - Active Low Reset

Dimensional Drawing

Technical Data

Datasheet

Analog Devices Website - Datasheet for MAX691

Application Notes