TPS3610 Battery-Backup Supervisors for RAM Retention | TI.com

TPS3610 (ACTIVE) Battery-Backup Supervisors for RAM Retention

Battery-Backup Supervisors for RAM Retention - TPS3610
Datasheet
 

Description

The TPS3610 family of supervisory circuits monitors and controls processor activity by providing backup-battery switchover for data retention of CMOS RAM. Other features include an additional power-fail comparator, low-line indication, watchdog function, battery-status indicator, manual switchover, and write protection for CMOS RAM.

The TPS3610 family allow usage of 3-V or 3.6-V lithium batteries as the backup supply in systems with, e.g., VDD = 1.8 V. During power-on, RESET\ is asserted when the supply voltage (VDD or VBAT) becomes higher than 1.1 V. Thereafter, the supply-voltage supervisor monitors VDD and keeps RESET\ output active as long as VDD remains below the threshold voltage VIT. An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time starts after VDD has risen above the threshold voltage VIT . When the supply voltage drops below the threshold voltage VIT, the output becomes active (low) again.

The product spectrum is designed for supply voltages of 1.8 V and 5 V. The circuits are available in a 14-pin TSSOP package. TPS3610 devices are characterized for operation over a temperature range of –40°C to 85°C.

Features

  • Supply Current of 40 µA (Max)
  • Battery Supply Current of 100 nA (Max)
  • Precision Supply-Voltage Monitor, 1.8 V, 5 V; Other Options on Request
  • Watchdog Timer With 800-ms Time-Out
  • Backup-Battery Voltage Can Exceed VDD
  • Power-On Reset Generator With Fixed 100-ms Reset Delay Time
  • Battery-OK Output
  • Voltage Monitor for Power-Fail or Low-Battery Monitoring
  • Manual Switchover to Battery-Backup Mode
  • Chip-Enable Gating ... 3 ns (at VDD = 5 V) Max Propagation Delay
  • Battery-Freshness Seal
  • 14-pin TSSOP Package
  • Temperature Range ... –40°C to 85°C
  • typical applications
    • Fax Machines
    • Set-Top Boxes
    • Advanced Voice Mail Systems
    • Portable Battery-Powered Equipment
    • Computer Equipment
    • Advanced Modems
    • Automotive Systems
    • Portable Long-Time Monitoring Equipment
    • Point of Sale Equipment

Parametrics

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Part number Order Threshold voltage 1 (Typ) (V) Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Rating Operating temperature range (C) Watchdog timer WDI (sec)
TPS3610 Order now 1.77
4.55    
2     5.5     1.65     Active-low
Push-pull    
100     Active-low enable
Battery backup switchover
Chip enable gating
Manual reset
Watchdog timer    
Catalog     -40 to 85     0.8    
TPS3600 Order now 1.78
2.22
2.93
4.4    
1     5.5     1.65     Active-low
Push-pull    
100     Active-low enable
Battery backup switchover
Chip enable gating
Manual reset
Watchdog timer
PFI/PFO    
Catalog     -40 to 85     0.8    
TPS3606-33 Order now 2.93     1     5.5     1.65     Active-low
Push-pull    
100     Active-low enable
Battery backup switchover
Manual reset
Watchdog timer
PFI/PFO    
Catalog     -40 to 85     0.8    
TPS3613-01 Order now Adjustable     1     5.5     1.65     Active-low
Push-pull    
100     Battery backup switchover
Chip enable gating
Dual output    
Catalog     -40 to 85     None    
TPS3617-50 Samples not available 4.55     1     5.5     1.65     Active-low
Push-pull    
100     Battery backup switchover
Watchdog timer
PFI/PFO    
Catalog     -40 to 85     0.8    
TPS3618-50 Samples not available 4.55     1     5.5     1.65     Active-low
Push-pull    
100     Battery backup switchover
Watchdog timer
PFI/PFO    
Catalog     -40 to 125     0.8    
TPS3619 Order now 2.93
4.55    
1     5.5     1.65     Active-low
Push-pull    
100     Active-low enable
Battery backup switchover
Manual reset
PFI/PFO    
Catalog     -40 to 85     None    
TPS3620 Order now 2.93
4.55    
2     5.5     1.65     Active-low
Push-pull    
100     Active-low enable
Battery backup switchover
Manual reset
PFI/PFO    
Catalog     -40 to 85     None