MAX16016, MAX16020, MAX16021 - NEW! - Low-Power μP Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating

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Description

FULL DATA SHEET (PDF, 216kB)

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The MAX16016/MAX16020/MAX16021 supervisory circuits monitor power supplies, provide battery-backup control, and chip-enable (CE) gating to write protect memory in microprocessor (µP)-based systems. These low-power devices improve system reliability by providing several supervisory functions in a small, single integrated solution.

The MAX16016/MAX16020/MAX16021 perform four basic system functions:

Provide a µP reset output during V_CC supply powerup, power-down, and brownout conditions.
Control V_CC to battery-backup switching internally to maintain data or low-power operation for memories, real-time clocks (RTCs), and other digital logic when the main power is removed.
Provide memory write protection through internal chip-enable gating during brownout.
Provide a combination of additional supervisory functions listed in the Features section in the full data sheet.

The MAX16016/MAX16020/MAX16021 operate from a 1.53V to 5.5V supply voltage and offer fixed reset thresholds for monitoring 5V, 3.3V, 3V, 2.5V, and 1.8V systems. Each device is available with either a pushpull or open-drain reset output.

The MAX16016/MAX16020/MAX16021 are available in small TDFN/TQFN packages and are fully specified for an operating temperature range of -40°C to +85°C.

Key Features

Applications/Uses

System Monitoring for 5V, 3.3V, 3V, 2.5V, or 1.8V Power-Supply Voltages
1.53V to 5.5V Operating Voltage Range
Low 1.2µA Supply Current (0.25µA in Battery-Backup Mode)
145ms (min) Reset Timeout Period
Battery Freshness Seal
On-Board Gating of CE Signals, 1.5ns Propagation Delay (MAX16020/MAX16021)
Debounced Manual Reset Input
Watchdog Timer, 1.2s (typ) Timeout
Power-Fail Comparator and Low-Line Indicator for Monitoring Voltages Down to 0.6V
Battery-On, Battery-OK, and Battery Test Indicators
Small 10-Pin TDFN or 16-Pin TQFN Packages
UL®-Certified to Conform to IEC60950-1
Underwriters Laboratories (UL®) Recognized

	GPS Systems
	Industrial Control
	Main/Backup Power for RTCs, CMOS Memories
	Point-of-Sale Equipment
	Portable/Battery Equipment
	Set-Top Boxes

Key Specifications: Battery Backup Circuits

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Max. I_CC (µA)

Features

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX16016 NEW!

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

Open Drain
Push-Pull

•	Batt Freshness Seal

•	Battery On

•	Manual Reset

•	Power Fail Comparator

•

Watchdog

Yes

THIN QFN (Dual)/10

-40 to +85

$2.48 @ 1k

MAX16020 NEW!

•	Batt Freshness Seal

•	Battery On

•	Chip Enable Gate

•

Low Line

•	Manual Reset

•	Power Fail Comparator

•

Watchdog

THIN QFN/16

$3.05 @ 1k

MAX16021 NEW!

Open Drain
Push-Pull

•	Batt Freshness Seal

•	Battery On

•	Chip Enable Gate

•

Low Line

•	Manual Reset

•	Power Fail Comparator

•

Watchdog

THIN QFN/16

$2.97 @ 1k

See All Battery Backup Circuits (92)

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.