MAX808_EPA datasheet(7/12 Pages) MAXIM

Part #	MAX808_EPA

Description	8-Pin uP Supervisory Circuits with 짹1.5% Reset Accuracy

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Manufacturer	MAXIM [Maxim Integrated Products]

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8-Pin µP Supervisory Circuits

with ±1.5% Reset Accuracy

_______________________________________________________________________________________

7

_________________________________________________Pin Description (continued)

Active-High Reset Output. RESET is the inverse of RESET. It is a CMOS output that

sources and sinks current. RESET swings between VCC and GND.

—

5

Chip-Enable Output. Output to the chip-enable gating circuit. CE OUT is pulled up to

the higher of VCC or VBATT when the chip-enable gate is disabled.

5

—

Watchdog Input. If WDI remains high or low longer than the watchdog timeout period

(typically 1.6sec), RESET will be asserted for 200ms. Leave unconnected to disable the

watchdog function.

—

6

Chip-Enable Input

6

—

RESET

CE OUT

WDI

CE IN

BATT

OUT

Backup-Battery Input. When VCC falls below the reset threshold and VBATT, OUT switch-

es from VCC to BATT. VBATT may exceed VCC. The battery can be removed while the

MAX801/MAX808 is powered up, provided BATT is bypassed with a 0.1µF capacitor to

GND. If no battery is used, connect BATT to ground and VCC to OUT.

7

Output Supply Voltage to CMOS RAM. When VCC exceeds the reset threshold or VBATT,

OUT connects to VCC. When VCC falls below the reset threshold and VBATT, OUT con-

nects to BATT. Bypass OUT with a 0.1µF capacitor to GND.

8

NAME

MAX801

MAX808

FUNCTION

MAX801

MAX808

CE IN

GND

VCC

BATT

THE HIGHER

OF VCC

OR VBATT

MAX801 ONLY

MAX808 ONLY

BATTERY-BACKUP

COMPARATOR

RESET

COMPARATOR

LOW-LINE

COMPARATOR

2.275V

OUT

LOWLINE

WDI

RESET (MAX801 ONLY)

RESET

CE OUT

P

N

WATCHDOG

TRANSITION

DETECTOR

STATE

MACHINE

OSCILLATOR

Figure 1. Functional Diagram

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