MAX16021 Maxim Integrated Products, MAX16021 Datasheet - Page 11

• Manufacturer Part Number: MAX16021
• Description: (MAX160xx) Low-Power uP Supervisory Circuits
• Manufacturer: Maxim Integrated Products

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MAX16020 MAX16021
Battery-Backup Circuit and Chip-Enable Gating
10
11
12
13
14
15
16
—
9
PIN
10
11
12
13
14
15
16
—
9
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Low-Power µP Supervisory Circuits with
CEOUT
RESET
NAME
WDO
CEIN
GND
OUT
PFO
V
EP
CC
Pin Description—MAX16020/MAX16021 (continued)
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.
Active-Low Power-Fail Comparator Output. PFO goes low when V
0.6V threshold and goes high when V
Ground
Active-Low Reset Output. RESET asserts when V
pulled low. RESET remains low for the duration of the reset timeout period after V
above the reset threshold and MR goes high.
Switched Output. OUT is connected to V
V
greater than V
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.
Chip-Enable Input. The input to CE gating circuitry. Connect to GND or OUT if not used.
Supply Voltage Input. Bypass V
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.
CC
is greater than V
CC
. Bypass OUT to GND with a 0.1µF (min) capacitor.
BATT
. OUT connects to BATT when RESET is asserted and V
CC
to GND with a 0.1µF capacitor.
PFT
FUNCTION
CC
rises above V
when the reset output is not asserted or when
CC
falls below the reset threshold or MR is
PFT
+ V
PFT-HYS
PFI
falls below the internal
hysteresis.
CC
BATT
rises
is
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