MAX793, MAX793R, MAX793S, MAX793T, MAX794, MAX795, MAX795R, MAX795S, MAX795T 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits

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The MAX793/MAX794/MAX795 microprocessor (µP) supervisory circuits monitor and control the activities of +3.0V/+3.3V µPs by providing backup-battery switchover, among other features such as low-line indication, µP reset, write protection for CMOS RAM, and a watchdog (see the Selector Guide in the full datasheet). The backup-battery voltage can exceed V_CC, permitting the use of 3.6V lithium batteries in systems using 3.0V to 3.3V for V_CC.

The MAX793/MAX795 offer a choice of reset threshold voltage range (denoted by suffix letter): 3.00V to 3.15V (T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The MAX794’s reset threshold is set externally with a resistor divider. The MAX793/MAX794 are available in 16-pin DIP and narrow SO packages, and the MAX795 comes in 8-pin DIP and SO packages.

Key Features

Applications/Uses

MAX793/MAX794/MAX795

Precision Supply-Voltage Monitor:
- Fixed Reset Trip Voltage (MAX793/MAX795)
- Adjustable Reset Trip Voltage (MAX794)
Guaranteed Reset Assertion to V_CC = 1V
Backup-Battery Power Switching—Battery Voltage Can Exceed V_CC
On-Board Gating of Chip-Enable Signals—7ns Max Propagation Delay

MAX793/MAX794 Only

Battery Freshness Seal
Battery OK Output (MAX793)
Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning
Independent Watchdog Timer (1.6s timeout)
Manual Reset Input

	Battery-Powered Computers/Controllers
	Critical µP Power Monitoring
	Embedded Controllers
	Intelligent Controllers
	Portable Equipment

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^**

MAX793

2.5 to 3.3

Open Drain

Push-Pull

•	Adjustable Reset Input

•	Battery On

•	Chip Enable Gate

•

Low Line

•	Manual Reset

•	Power Fail Comparator

•

Watchdog

Yes

PDIP/16
SOIC/16

-40 to +85
0 to +70

$3.48 @ 1k

MAX794

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

•	Battery On

•	Chip Enable Gate

•

Low Line

•	Manual Reset

•	Power Fail Comparator

•

Watchdog

PDIP/16
SOIC/16

$3.48 @ 1k

MAX795

2.5 to 3.3

•	Battery On

•	Chip Enable Gate

PDIP/8
SOIC/8

$3.41 @ 1k

See All Battery Backup Circuits (84)

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.