MAX6365, MAX6365H, MAX6365L, MAX6365P, MAX6366, MAX6366H, MAX6366L, MAX6366P, MAX6367, MAX6367H, MAX6367L, MAX6367P, MAX6368, MAX6368H, MAX6368L, MAX6368P SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating

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The MAX6365–MAX6368 supervisory circuits simplify power-supply monitoring, battery-backup control functions, and memory write protection in microprocessor (µP) systems. The circuits significantly improve the size, accuracy, and reliability of modern systems with an ultra-small integrated solution.

These devices perform four basic system functions:

Provide a µP reset output during V_CC supply power-up, power-down, and brownout conditions.
Internally control V_CC to backup-battery switching to maintain data or low-power operation for CMOS RAM, CMOS µPs, real-time clocks, and other digital logic when the main supply fails.
Provide memory write protection through internal chip-enable gating during supply or processor faults.
Include one of the following options: a manual reset input (MAX6365), a watchdog timer function (MAX6366), a battery-on output (MAX6367), or an auxiliary user-adjustable reset input (MAX6368).

The MAX6365–MAX6368 operate from V_CC supply voltages as low as 1.2V. The factory preset reset threshold voltages range from 2.32V to 4.63V (see Ordering Information). In addition, each part is offered in three reset output versions: push-pull active low, open-drain active low, or open-drain active high (see Selector Guide). The MAX6365–MAX6368 are available in miniature 8-pin SOT23 packages.

Key Features

Applications/Uses

Low +1.2V Operating Supply Voltage (V_CC or V_BATT)
Precision Monitoring of +5.0, +3.3V, +3.0V, and
+2.5V Power-Supply Voltages
On-Board Gating of Chip-Enable Signals, 1.5ns Propagation Delay
Debounced Manual Reset Input (MAX6365)
Watchdog Timer, 1.6s Timeout (MAX6366)
Battery-On Output Indicator (MAX6367)
Auxiliary User-Adjustable RESET IN (MAX6368)
Low 10µA Quiescent Supply Current
Three Available Output Structures
- Push-Pull active-low RESET
- Open-Drain active-low RESET
- Open-Drain RESET
RESET/active-low RESET Valid Down to 1.2V Guaranteed
- (V_CC or V_BATT)
Power-Supply Transient Immunity
150ms min Reset Timeout Period
Miniature 8-Pin SOT23 Package

	Computers: Desktop, Workstation, Server
	Notebook Computers
	Palmtop Computers
	Pen Entry Palmtops
	Portable Patient Monitoring/Drug Delivery
	Portable Test Meters
	POS Terminals
	Printers and Faxes
	Programmable Logic Controllers

Key Specifications: Battery Backup Circuits

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Features

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6365H

2.5 to 3.3
3.3 to 5.5

Open Drain

•	Chip Enable Gate

•	Manual Reset

Yes

SOT-23/8

-40 to +85

$1.88 @ 1k

MAX6365L

2.5 to 3.3
3.3 to 5.5

Push-Pull

•	Chip Enable Gate

•	Manual Reset

$1.88 @ 1k

MAX6365P

2.5 to 3.3
3.3 to 5.5

Open Drain

•	Chip Enable Gate

•	Manual Reset

$1.88 @ 1k

MAX6366H

2.5 to 3.3
3.3 to 5.5

Open Drain

•	Chip Enable Gate

•

Watchdog

$1.88 @ 1k

MAX6366L

2.5 to 3.3
3.3 to 5.5

Push-Pull

•	Chip Enable Gate

•

Watchdog

$1.88 @ 1k

MAX6366P

2.5 to 3.3
3.3 to 5.5

Open Drain

•	Chip Enable Gate

•

Watchdog

$1.88 @ 1k

MAX6367H

2.5 to 3.3
3.3 to 5.5

Open Drain

•	Battery On

•	Chip Enable Gate

$1.88 @ 1k

MAX6367L

2.5 to 3.3
3.3 to 5.5

Push-Pull

•	Battery On

•	Chip Enable Gate

$1.88 @ 1k

MAX6367P

2.5 to 3.3
3.3 to 5.5

Open Drain

•	Battery On

•	Chip Enable Gate

$1.88 @ 1k

MAX6368H

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain

•	Adjustable Reset Input

•	Chip Enable Gate

$1.88 @ 1k

MAX6368L

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

•	Adjustable Reset Input

•	Chip Enable Gate

$1.88 @ 1k

MAX6368P

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain

•	Adjustable Reset Input

•	Chip Enable Gate

$1.88 @ 1k

See All Battery Backup Circuits (89)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.