The ADM690-ADM695 family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning.
The ADM690‑ADM695 family provides single‑chip supervisory solutions for microprocessor systems, including power‑on reset, battery backup switching, watchdog timer, RAM write protection and power‑fail warning. The devices are offered in 8‑pin DIP (ADM690, ADM691, ADM694, ADM695) and 16‑pin DIP/SOIC packages (ADM692, ADM693, ADM695) with a range of functions.
Key features include low standby current (as low as 0.6 µA), fast chip‑enable gating (5 ns), up to 100 mA output drive on VOUT, and configurable watchdog timeout periods. Detailed pin descriptions, functional block diagrams, absolute‑maximum ratings and ordering information are provided.
| VCC Operating Voltage Range (ADM690/ADM691/ADM694/ADM695) | 4.75 V – 5.5 V |
|---|---|
| Supply Current (Excludes I_OUT) | 1.95 mA typical |
| Reset Voltage Threshold (ADM690/ADM691/ADM694/ADM695) | Typical 4.65 V (4.5 V – 4.73 V guaranteed) |
| Watchdog Timeout Period (Internal Oscillator, typical) | 1.6 s |
| Maximum VOUT Output Current | 100 mA |
The typical reset threshold is 4.65 V, with guaranteed limits of 4.5 V minimum and 4.73 V maximum.
VOUT can supply up to 100 mA to power CMOS RAM or other low‑power logic.
They can be configured for a short 100 ms period, a long 1.6 s period, or an adjustable timeout using external components.