DESCRIPTION

The SP791 is a microprocessor (µP) supervisory circuit that integrates a myriad of components involved in discrete solutions to monitor power-supply and battery-control functions in µP and digital systems. The SP791 offers complete µP monitoring and watchdog functions. The SP791 is ideal for a low-cost battery management solution and is well suited for portable, battery-powered applications with its supply current of 40µA. The 6ns chip-enable propagation delay, the 25mA current output in battery-backup mode, and the 250mA current output in standard operation also makes the SP791 suitable for larger scale, high-performance equipment.

■ Precision 4.65V Voltage Monitoring

■ 200ms Power-OK/Reset Time Delay

■ Independent Watchdog Time-Preset or Adjustable

■ 75µA Maximum Operating Supply Current

■ 1.0µA Maximum Battery Backup Current

■ 0.1µA Maximum Battery Standby Current

■ Power Switching

250mA Output in Vcc Mode (0.6Ω)

25mA Output in Battery Mode (5Ω)

■ On-Board Gating of Chip-Enable Signals Memory Write-Cycle Completion 6ns CE Gate Propagation Delay

■ Voltage Monitor for Power-Fail or Low Battery

■ Backup-Battery Monitor

■ RESET Valid to Vcc=1V

■ Pin Compatible Upgrade to MAX791