MAX16020 datasheet(11/21 Pages) MAXIM

Part #	MAX16020

Description	Low-Power uP Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating

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Manufacturer	MAXIM [Maxim Integrated Products]

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Low-Power µP Supervisory Circuits with

Battery-Backup Circuit and Chip-Enable Gating

______________________________________________________________________________________

11

Pin Description—MAX16020/MAX16021 (continued)

MAX16020

MAX16021

NAME

FUNCTION

99

WDO

Active-Low Watchdog Output. WDO asserts when WDI remains high or low longer than the

watchdog timeout period. WDO returns high on the next WDI transition or when a reset is

asserted.

10

PFO

Active-Low Power-Fail Comparator Output. PFO goes low when VPFI falls below the internal

0.6V VPFT threshold and goes high when VPFI rises above VPFT + VPFT-HYS hysteresis.

11

GND

Ground

12

RESET

Active-Low Reset Output. RESET asserts when VCC falls below the reset threshold or MR is

pulled low. RESET remains low for the duration of the reset timeout period after VCC rises

above the reset threshold and MR goes high.

13

OUT

Switched Output. OUT is connected to VCC when the reset output is not asserted or when

VCC is greater than VBATT. OUT connects to BATT when RESET is asserted and VBATT is

greater than VCC. Bypass OUT to GND with a 0.1µF (min) capacitor.

14

CEOUT

Active-Low Chip-Enable Output. CEOUT goes low only when CEIN is low and reset is not

asserted. If CEIN is low when reset is asserted, CEOUT stays low for 12µs (typ) or until

CEIN goes high, whichever occurs first.

15

CEIN

Chip-Enable Input. The input to CE gating circuitry. Connect to GND or OUT if not used.

16

VCC

Supply Voltage Input. Bypass VCC to GND with a 0.1µF capacitor.

——

EP

Exposed Pad. Internally connected to GND. Connect EP to a large ground plane to aid

heat dissipation. Do not use EP as the only ground connection for the device.

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