MAX16021: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

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 VCC supply power-up, power-down, and brownout conditions. 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. 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 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.

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
MAX16016, MAX16020, MAX16021: Typical Application Circuit
MAX16016, MAX16020, MAX16021: Typical Application Circuit
Applications/Uses
  • GPS Systems
  • Industrial Control
  • Main/Backup Power for RTCs, CMOS Memories
  • Point-of-Sale Equipment
  • Portable/Battery Equipment
  • Set-Top Boxes
DataSheet
titleDownload file
MAX16016-MAX16021 Data SheetMAX16016-MAX16021.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OutICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX160161.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
Push-Pull
5-40 to +85TDFN-EP/10$3.08 @1k
MAX16020Active Low
Open Drain
Push-Pull
TQFN/16$3.05 @1k
MAX16021Active High
Active Low
Open Drain
Push-Pull
TQFN/16$3.08 @1k
Quality and Environmental Data
Related Products
  • MAX16033:Low-Power Battery-Backup Circuits in Small µDFN Packages
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16021LTEL+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEL+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEM+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEM+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTER+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTER+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTES+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTES+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTET+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTET+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16021LTEV+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEV+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEW+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEW+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEY+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEY+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEZ+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021LTEZ+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEL+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEL+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16021PTEM+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEM+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTER+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTER+TActiveQFN;-40°C to +85°CSee data sheet
MAX16021PTES+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTES+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTET+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTET+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEV+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEV+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16021PTEW+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEW+TActiveQFN;-40°C to +85°CSee data sheet
MAX16021PTEY+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEY+TActiveQFN;-40°C to +85°CSee data sheet
MAX16021PTEZ+ActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16021PTEZ+TActiveTQFN,;16 pin;16.8 mm²-40°C to +85°CLead Free
MAX16016-MAX16021.pdf MAX16021
MAX16016-MAX16021_cn.pdf MAX16021
MAX16021.pdf MAX16021
MAX16016-MAX16021_cn.pdf MAX16021