# ADM8690ARNZ

**Analog Devices** · Monitors & Reset Circuits · SOIC-8

ADM8690ARNZ from Analog Devices, in a SOIC-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 | Output voltage; VCC or VBATT is internally switched to VOUT depending on which is at the highest potential, supplies up to 100 mA to CMOS RAM, and should be connected to VCC if VOUT and VBATT are not used. |
| 2 | VCC | power_in | Power supply input, 5 V nominal; VCC or VBATT is internally switched to VOUT depending on which is at the highest potential. |
| 3 | GND | power_in | Ground, the 0 V reference for all signals. |
| 4 | PFI | input | Power-fail input, the noninverting input to the power-fail comparator; PFO goes low when PFI is less than 1.3 V, and PFI should be connected to GND or VOUT when not used. |
| 5 | PFO | output | Power-fail output of the comparator that goes low when PFI is less than 1.3 V, and the comparator is turned off with PFO low when VCC is below VBATT. |
| 6 | WDI | input | Three-level watchdog input; if it stays high or low longer than the watchdog timeout period RESET pulses low, the timer resets on each transition, and the watchdog is disabled if WDI is floating or driven to midsupply. |
| 7 | RESET | output | Active-low logic output that goes low if VCC falls below the reset threshold (typically 4.65 V) or the watchdog is not serviced, stays low for 50 ms after VCC returns above the threshold, and has an internal 3 μA pull-up. |
| 8 | VBATT | power_in | Backup battery input; VBATT or VCC is internally switched to VOUT depending on which is at the highest potential. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-8 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| VCC Operating Voltage Range | VCC | 4.75 |  | 5.5 | V |  | 4 |
| VBATT Operating Voltage Range | VBATT | 2 |  | 4.25 | V |  | 4 |
| Reset Voltage Threshold |  | 4.5 | 4.65 | 4.73 | V |  | 4 |
| Reset Timeout Delay (ADM8690) |  | 35 | 50 | 70 | ms | OSC SEL = high | 4 |
| Watchdog Timeout Period, Internal Oscillator, Long |  | 1 | 1.6 | 2.25 | Seconds | Long period | 4 |
| Watchdog Timeout Period, Internal Oscillator, Short |  | 70 | 100 | 140 | ms | Short period | 4 |
| PFI Input Threshold |  | 1.25 | 1.3 | 1.35 | V | VCC = 5 V | 4 |
| PFI Input Current |  | -25 | 0.01 | 25 | nA |  | 4 |
| Supply Current (Excludes IOUT) |  |  | 140 | 200 | μA | IOUT = 100 μA | 4 |
| Supply Current in Battery Backup Mode |  |  | 0.4 | 1 | μA | VCC = 0 V, VBATT = 2.8 V | 4 |
| Battery Standby Current |  | -0.1 |  | 0.02 | μA | 5.5 V > VCC > VBATT + 0.2 V, + = Discharge, − = Charge, TA = 25°C | 4 |
| BATT ON Output Voltage |  |  |  | 0.3 | V | ISINK = 3.2 mA | 4 |
| RESET Output Voltage at VCC = 1 V |  |  | 4 | 20 | mV | ISINK = 10 μA, VCC = 1 V | 4 |
| RESET Output Voltage (low) |  |  | 0.05 | 0.4 | V | ISINK = 1.6 mA, VCC = 4.25 V | 4 |
| WDI Input Threshold Logic Low |  |  |  | 0.8 | V |  | 4 |
| WDI Input Threshold Logic High |  | 3.5 |  |  | V |  | 4 |
| PFO Output Voltage low |  |  |  | 0.4 | V | ISINK = 3.2 mA | 4 |
| PFO Short-Circuit Source Current |  | 1 | 3 | 25 | μA | PFI = low, PFO = 0 V | 4 |
| VCC | VCC | -0.3 |  | 6 | V | TA = 25°C | 6 |
| VBATT | VBATT | -0.3 |  | 6 | V | TA = 25°C | 6 |
| Power Dissipation, 8-Lead SOIC |  |  |  | 400 | mW | TA = 25°C | 6 |
| θJA Thermal Impedance, 8-Lead SOIC | θJA |  | 120 |  | °C/W |  | 6 |
| Operating Temperature Range, Industrial (A Version) |  | -40 |  | 85 | °C |  | 6 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 6 |

## CAD (KiCad official)

- Symbol: `ADM8690ARNZ`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `adm8690arnz-etched.step` / `adm8690arnz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `adm8690arnz.step` / `adm8690arnz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/ADM8690_8691_8695.pdf) (24 pp, sha256 `d60a47100b28c768`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/adm8690arnz-datasheet.pdf)