MAX6394 High-Accuracy µP Reset Circuit

Description

The MAX6394 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It offers excellent circuit reliability by providing 1% accurate thresholds over temperature and by eliminating external components and adjustments. The MAX6394 also provides a debounced manual reset input.

This device performs a single function: it asserts a reset signal whenever the V_CC supply voltage falls below a preset threshold or whenever manual reset is asserted. Active-low RESET remains asserted for an internally programmed interval (reset timeout period) after V_CC has risen above the reset threshold or manual reset is deasserted. The MAX6394's open-drain active-low RESET output can be pulled up to a voltage higher than V_CC.

The MAX6394 comes with factory-trimmed reset threshold voltages from 2.4V to 4.8V. Preset timeout periods of 0.7ms, 14ms, 105ms, and 826ms are also available. The device comes in a SOT143 package.

Key Features

Applications/Uses

±0.6% Threshold Accuracy at T_A = +25°C
±1.0% Threshold Accuracy from -40°C to +125°C
Small SOT143 Package
Open-Drain Active-Low RESET Output Can Exceed V_CC
Precision, Factory-Set V_CC Reset Thresholds: Nine Options from 2.4V to 4.8V
Four Reset Timeout Periods Available: 0.7ms, 14ms, 105ms, and 826ms (minimum)
Immune to Short V_CC Transients
5µA Supply Current

	Computers
	Controllers
	Critical µP and µC Power Monitoring
	Intelligent Instruments
	Portable/Battery-Powered Equipment

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

Price^**

MAX6394

1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain

1ms to 15ms
85ms to 300ms
300ms to 1s
<1ms

No Watchdog

Manual Reset

0.6

$1.57 @ 1k

See All Supervisors (1 Monitored Voltage) (270)

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.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-72 of 72

MAX6394

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Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6394US480D4+T