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Low-Power μP Supervisory Circuits with Battery-Backup Circuit and Chip-Enable Gating

Industry's Most Sophisticated Battery-Backup Supervisory Circuits with Chip-Enable Gating and Power-Supply Monitoring

Product Details

Key Features

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Out Active High
Active Low
Open Drain
Push-Pull
ICC (µA) (max) 5
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/16
Budgetary
Price (See Notes)
3.66
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Out Active High
Active Low
Open Drain
Push-Pull
ICC (µA) (max) 5
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/16
Budgetary
Price (See Notes)
3.66

Key Features

  • 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

Applications/Uses

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

Description

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:
  1. Provide a µP reset output during VCC supply power-up, power-down, and brownout conditions.
  2. Control VCC 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.
  3. Provide memory write protection through internal chip-enable gating during brownout.
  4. 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 push-pull 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.

Simplified Block Diagram

MAX16016, MAX16020, MAX16021: Typical Application Circuit MAX16016, MAX16020, MAX16021: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.