# CN813L

**ShangHai Consonance Elec** · Supervisor And Reset ICs · SOP-8

CN813L from ShangHai Consonance Elec, in a SOP-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 | MR | input | Manual reset input: a low level triggers a reset pulse, the pin has an internal pull-up so it can be left floating, and it is compatible with TTL/CMOS levels. |
| 2 | VCC | power_in | Positive supply input; the datasheet gives an operating supply range of 1.15 V to 5.5 V (absolute maximum VCC is 6.0 V). |
| 3 | GND | power_in | Ground (power supply return) input for the device. |
| 4 | PFI | input | Power-fail detection input: PFO goes low when the voltage on PFI is below the 1.22 V threshold; it may be tied to VCC or GND if unused. |
| 5 | PFO | output | Power-fail output that is low when PFI is below 1.22 V and high otherwise. |
| 6 | WDI | input | Watchdog input: if WDI stays high or low for more than 1.6 s without a transition, WDO goes low; leaving WDI floating or at high impedance disables the watchdog. |
| 7 | RESET | output | Active-high reset output: it is held high while VCC is below the reset threshold and stays high for about 200 ms (140 to 280 ms) after VCC rises above the threshold, then goes low. |
| 8 | WDO | output | Watchdog output that goes low when the 1.6 s watchdog timer times out until it is reset, and also goes low while VCC is below the reset threshold, returning high immediately once VCC exceeds it. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ShangHai Consonance Elec |
| Package | SOP-8 |
| Category | Power Management (PMIC) |
| 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 supply voltage range | VCC | 1.15 |  | 5.5 | 伏特 |  | 6 |
| Reset threshold (CN705/707/813L) | VRES | 4.5 | 4.65 | 4.75 | 伏特 |  | 6 |
| Reset pulse width | tRES | 140 | 200 | 280 | 毫秒 |  | 6 |
| Watchdog timeout | tWD | 1 | 1.6 | 2.25 | 秒 |  | 6 |
| WDI pulse width (VCC=5V) | tWP | 50 |  |  | 纳秒 | VCC=5V | 6 |
| WDI pulse width (VCC<4.5V) | tWP | 120 |  |  | 纳秒 | VCC<4.5V | 6 |
| WDI input high threshold |  | 3.5 |  |  | 伏特 | VCC=5V | 6 |
| WDI pull-up resistance |  | 125 | 250 | 500 | K | VCC>VRES | 7 |
| WDI pull-down resistance |  | 88 | 175 | 350 | K | VCC>VRES | 7 |
| Supply current (CN705/706X/813X) | IVCC |  | 52 | 105 | 微安 |  | 6 |
| Reset output low voltage VOL1 (VCC=5V) | VOL1 |  |  | 0.3 | 伏特 | ISINK=3.2mA, VCC=5V | 6 |
| Reset output low voltage VOL1 (VCC=1.2V) | VOL1 |  |  | 0.3 | 伏特 | ISINK=150uA, VCC=1.2V | 6 |
| Reset output high voltage VOH1 (VCC=1.2V) | VOH1 | 1 |  |  | 伏特 | ISOURCE=8uA, VCC=1.2V | 6 |
| WDO output low voltage | VOL2 |  |  | 0.3 | 伏特 | ISINK=3.2mA | 7 |
| MR pull-up current (VCC=5V) |  | 100 | 250 | 600 | 微安 | MR=0V, VCC=5V | 7 |
| MR pull-up current (VCC=4V) |  | 60 | 152 | 360 | 微安 | MR=0V, VCC=4V | 7 |
| MR pull-up current (VCC=3V) |  | 32 | 75 | 180 | 微安 | MR=0V, VCC=3V | 7 |
| MR pull-up current (VCC=2.5V) |  | 20 | 44 | 105 | 微安 | MR=0V, VCC=2.5V | 7 |
| MR pulse width (VCC=5V) | TMR | 150 |  |  | 纳秒 | VCC=5V | 7 |
| MR pulse width (VCC<4.5V) | TMR | 500 |  |  | 纳秒 | VCC<4.5V | 7 |
| MR input low threshold |  |  |  | 0.8 | 伏特 | VCC=5V | 7 |
| MR input high threshold |  | 2 |  |  | 伏特 | VCC=5V | 7 |
| MR to reset output delay (VCC=5V) | tMD |  |  | 250 | 纳秒 | VCC=5V | 7 |
| MR to reset output delay (VCC<4.5V) | tMD |  |  | 750 | 纳秒 | VCC<4.5V | 7 |
| Power-fail input threshold | VPFI | 1.184 | 1.22 | 1.256 | 伏特 |  | 7 |
| PFO output low voltage | VOL3 |  |  | 0.3 | 伏特 | ISINK=3.2mA | 7 |
| VCC pin voltage (absolute maximum) | VCC | -0.3 |  | 6 | 伏特 |  | 6 |
| Other input pins voltage (absolute maximum) |  | -0.3 |  | 6 | 伏特 |  | 6 |
| VCC pin current (absolute maximum) |  |  |  | 20 | mA |  | 6 |
| GND pin current (absolute maximum) |  |  |  | 20 | mA |  | 6 |
| Input current (absolute maximum) |  |  |  | 20 | mA |  | 6 |
| Output current (absolute maximum) |  |  |  | 20 | mA |  | 6 |
| Operating temperature | TA | -40 |  | 85 | ℃ |  | 6 |
| Storage temperature |  | -65 |  | 150 | ℃ |  | 6 |
| Maximum junction temperature |  |  |  | 150 | ℃ |  | 6 |
| Soldering temperature |  |  |  | 300 | ℃ |  | 6 |
| ESD voltage (HBM) |  |  |  | 2 | KV | HBM | 6 |
| Thermal resistance, junction to ambient (SOP8) |  |  | 190 |  | /W |  | 6 |
| Power-fail input current | IPFI |  | 0 |  | 纳安 |  | 7 |

## CAD (KiCad official)

- Symbol: `CN813L`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `cn813l-etched.step` / `cn813l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cn813l.step` / `cn813l.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ShangHai Consonance Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588894367470006272) (14 pp, sha256 `fe7cca14ea02af6e`, retrieved 2026-10-19, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/cn813l-datasheet.pdf)