Analog Devices MAX691ACWE+, Battery Backup Circuit supervisor, 1-channel voltage monitor, 4.65V threshold, 140ms minimum reset timeout, active high/active low push-pull outputs, 16-SOIC surface-mount package, 0°C to 70°C operating temperature.
| Parameter | Value |
|---|---|
| Type | Battery Backup Circuit |
| Mounting | Surface Mount |
| Voltage - threshold | 4.65V |
| Number of voltages monitored | 1 |
| Operating temperature | 0°C ~ 70°C (TA) |
| Reset | Active High/Active Low |
| Output | Push-Pull, Push-Pull |
| Package | Tube |
| Reset timeout | 140ms Minimum |
| Case | 16-SOIC (0.295\", 7.50mm Width) |
Both active-high and active-low reset outputs are available, each driven by a push-pull stage. That means no external pull-up resistors and the ability to interface with both reset-polarity conventions on the same board. For a 5V logic system, this part sits between the rail and the processor's reset input, with the backup battery connected to the VBAT pin.
The difference is the package. MAX691ACWE+ is the 16-pin SOIC (surface-mount, 7.50mm width) variant, while MAX691ACPE+ is the 16-pin DIP (through-hole) variant. The electrical specifications — battery-backup circuit, 4.65V threshold, 140ms timeout, active high/low outputs — are identical between the two. The choice is purely a board-assembly decision: surface-mount reflow versus through-hole wave solder or socket.
The base MAX691 (without the ACWE+ suffix) is the same die in an older package or temperature grade. The MAX691ACWE+ is the commercial-temperature, surface-mount version. Electrically it is a drop-in replacement for any MAX691 function: same battery-backup switchover, same 4.65V threshold, same reset outputs. Verify the package fit — if the original was a DIP, the SOIC footprint will not match without an adapter.
Its listed type is Battery Backup Circuit, meaning it combines a voltage supervisor with automatic battery-switchover logic. Reset outputs are both active high and active low, push-pull, so no external pull-ups are needed.