# MAX690AEPA+

**Maxim Integrated** · Monitors & Reset Circuits · PDIP-8

MAX690AEPA+ from Maxim Integrated, in a PDIP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VOUT | power_out | Supply output for CMOS RAM that connects to VCC through a P-channel MOSFET switch when VCC is above the reset threshold, and to the higher of VCC or VBATT when VCC is below it. |
| 2 | VCC | power_in | +5V supply input; the datasheet gives an operating voltage range of 1.2V to 5.5V for the MAX690AE/M and specifies VCC = 4.75V to 5.5V for the electrical characteristics of the MAX690A. |
| 3 | GND | power_in | Ground reference for the device. |
| 4 | PFI | input | Power-fail comparator input compared against an internal 1.25V reference, with an input current of ±25nA maximum, and it should be connected to GND or VCC when not used. |
| 5 | PFO | output | Power-fail output that goes low when PFI is less than 1.25V and otherwise stays high. |
| 6 | WDI | input | Watchdog input; if WDI remains high or low for 1.6s without toggling, a reset pulse is triggered, and leaving WDI floating or three-stated disables the watchdog timer. |
| 7 | RESET | output | Active-low reset output that pulses low for 200ms after a reset is triggered, stays low while VCC is below the 4.65V reset threshold, and remains low for 200ms after VCC rises above it. |
| 8 | VBATT | power_in | Backup-battery input that switches to VOUT when VCC falls below the reset threshold and VBATT is at least 20mV greater than VCC, with a maximum backup-battery voltage of 4.80V for the MAX690A; ground it when no backup battery is used. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Maxim Integrated |
| Package | PDIP-8 |
| Category | Power Management ICs |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Voltage Range, VCC, VBATT | VCC, VBATT | 1.2 |  | 5.5 | V | MAX69_AE/M | 2 |
| Supply Current (Excluding IOUT) | ISUPPLY |  | 200 | 500 | µA | MAX69_AE/M | 2 |
| ISUPPLY in Battery-Backup Mode (Excluding IOUT) | ISUPPLY |  | 0.05 | 1 | µA | VCC = 0V, VBATT = 2.8V, TA = +25°C | 2 |
| ISUPPLY in Battery-Backup Mode (Excluding IOUT) | ISUPPLY |  |  | 5 | µA | VCC = 0V, VBATT = 2.8V, TA = TMIN to TMAX | 2 |
| VBATT Standby Current |  | -0.1 | 0.02 |  | µA | 5.5V > VCC > VBATT +0.2V, TA = +25°C | 2 |
| VBATT Standby Current |  | -1 | 0.02 |  | µA | 5.5V > VCC > VBATT +0.2V, TA = TMIN to TMAX | 2 |
| Battery Switch Threshold, VCC to VBATT (Power-up) |  |  | 20 |  | mV | VCC < VRT | 2 |
| Battery Switch Threshold, VCC to VBATT (Power-down) |  |  | -20 |  | mV | VCC < VRT | 2 |
| Battery Switchover Hysteresis |  |  | 40 |  | mV |  | 2 |
| Reset Threshold | VRT | 4.5 | 4.65 | 4.75 | V | MAX690A | 2 |
| Reset Threshold Hysteresis |  |  | 40 |  | mV |  | 2 |
| Reset Pulse Width | tRS | 140 | 200 | 280 | ms |  | 2 |
| RESET Output Voltage (VOL) |  |  |  | 0.4 | V | ISINK = 3.2mA | 3 |
| RESET Output Voltage (VOL) |  |  |  | 0.3 | V | MAX69_AE/M, VCC = 1.2V, ISINK = 100µA | 3 |
| Watchdog Timeout | tWD | 1 | 1.6 | 2.25 | s |  | 3 |
| WDI Pulse Width | tWP | 50 |  |  | ns | VIL = 0.4V, VIH = 0.8 VCC | 3 |
| WDI Input Threshold, Logic Low |  |  |  | 0.8 | V | VCC = 5V | 3 |
| WDI Input Threshold, Logic High |  | 3.5 |  |  | V | VCC = 5V | 3 |
| WDI Input Current (WDI = VCC) |  | 50 |  | 150 | µA | WDI = VCC | 3 |
| WDI Input Current (WDI = 0V) |  | -150 |  | -50 | µA | WDI = 0V | 3 |
| PFI Input Threshold |  | 1.2 | 1.25 | 1.3 | V | MAX69_A, VCC = 5V | 3 |
| PFI Input Current |  | -25 | 0.01 | 25 | nA |  | 3 |
| PFO Output Voltage (VOL) |  |  |  | 0.4 | V | ISINK = 3.2mA | 3 |
| VCC Terminal Voltage (with respect to GND) | VCC | -0.3 |  | 6 | V |  | 2 |
| VBATT Terminal Voltage (with respect to GND) | VBATT | -0.3 |  | 6 | V |  | 2 |
| VCC Input Current | VCC |  |  | 200 | mA |  | 2 |
| VBATT Input Current | VBATT |  |  | 50 | mA |  | 2 |
| GND Input Current | GND |  |  | 20 | mA |  | 2 |
| All Other Outputs Output Current |  |  |  | 20 | mA |  | 2 |
| Rate of Rise, VCC, VBATT |  |  |  | 100 | V/µs |  | 2 |
| Storage Temperature Range |  | -65 |  | 160 | °C |  | 2 |
| Lead Temperature |  |  |  | 300 | °C | Soldering, 10s | 2 |
| Operating Temperature Range (MAX69_AE) |  | -40 |  | 85 | °C | MAX69_AE__ | 2 |
| Supply Voltage VCC (test range for MAX690A) | VCC | 4.75 |  | 5.5 | V | MAX690A/MAX802L/MAX805L electrical characteristics range | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | LCP |  | MAX802LCPA 0°C to +70°C 8 Plastic DIP | 12 |

## CAD (KiCad official)

- Symbol: `MAX690AEPA+`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `max690aepa-etched.step` / `max690aepa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max690aepa.step` / `max690aepa.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Maxim Integrated datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/max690a-max805l.pdf) (13 pp, sha256 `7dbca99620bf04f7`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/max690aepa-datasheet.pdf)