# HT4116ARMZ

**HTCSEMI** · Real Time Clocks · MSOP-8

HT4116ARMZ from HTCSEMI, in a MSOP-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 | OSCI | input | Oscillator input for the external 32.768 kHz crystal. |
| 2 | OSCO | output | Oscillator output for the external 32.768 kHz crystal. |
| 3 | VBAT | power_in | Battery supply voltage, 2.5 to 3.5 V (3 V typ.), used for backup when VCC falls below the switchover voltage VSO. |
| 4 | VSS | power_in | Ground. |
| 5 | SDA | bidirectional | Serial data address input/output of the I2C bus; requires an external pull-up resistor to a positive supply. |
| 6 | SCL | input | Serial clock input of the I2C bus (0 to 100 kHz); requires an external pull-up resistor to a positive supply. |
| 7 | FT/OUT | output | Frequency test (512 Hz) or output driver pin, open drain, requires an external pull-up resistor (pull-up supply up to 5.5 V). |
| 8 | VCC | power_in | Supply voltage, 2.0 to 5.5 V clock operating voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| Package | MSOP-8 |
| Category | Clock/Timing |
| 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 |
|---|---|---|---|---|---|---|---|
| Supply voltage (VCC) | VCC | 2 |  | 5.5 | V |  | 15 |
| Ambient operating temperature (TA) | TA | -40 |  | 85 | °C |  | 15 |
| Ambient operating temperature | TA | -40 |  | 85 | °C |  | 14 |
| Input voltage (VIO) | VIO | -0.3 |  | 7 | V |  | 14 |
| Supply voltage (VCC) | VCC | -0.3 |  | 7 | V |  | 14 |
| Output current (IO) | IO |  |  | 20 | mA |  | 14 |
| Power dissipation (PD) | PD |  |  | 0.25 | W |  | 14 |
| Lead solder temperature (TSLD) | TSLD |  |  | 260 | °C | for 10 seconds | 14 |
| Input leakage current (ILI) | ILI | -1 |  | 1 | µA | 0V ≤ VIN ≤ VCC | 16 |
| Output leakage current (ILO) | ILO | -1 |  | 1 | µA | 0V ≤ VOUT ≤ VCC | 16 |
| Supply current (ICC1) | ICC1 |  |  | 300 | µA | Switch frequency = 100 kHz | 16 |
| Supply current (standby) (ICC2) | ICC2 |  |  | 70 | µA | SCL, SDA = VCC, 0.3 V | 16 |
| Input low voltage | VIL | -0.3 |  | 0.3 | x VCC |  | 16 |
| Input high voltage | VIH | 0.7 |  |  | x VCC |  | 16 |
| Output low voltage | VOL |  |  | 0.4 | V | IOL = 3 mA | 16 |
| Pull-up supply voltage (open drain) FT/OUT |  |  |  | 5.5 | V | open drain FT/OUT | 16 |
| Battery supply voltage | VBAT | 2.5 | 3 | 3.5 | V |  | 16 |
| Battery supply current | IBAT |  | 0.8 | 1 | µA | TA = 25°C, VCC = 0 V, oscillator ON, VBAT = 3 V | 16 |
| SCL clock frequency | fSCL | 0 |  | 100 | kHz |  | 7 |
| Clock low period | tLOW | 4.7 |  |  | µs |  | 7 |
| Clock high period | tHIGH | 4 |  |  | µs |  | 7 |
| SDA and SCL rise time | tR |  |  | 1 | µs |  | 7 |
| SDA and SCL fall time | tF |  |  | 300 | ns |  | 7 |
| START condition hold time | tHD:STA | 4 |  |  | µs | (after this period the first clock pulse is generated) | 7 |
| START condition setup time | tSU:STA | 4.7 |  |  | µs | (only relevant for a repeated start condition) | 7 |
| Data setup time | tSU:DAT | 250 |  |  | ns |  | 7 |
| Data hold time | tHD:DAT | 0 |  |  | µs |  | 7 |
| STOP condition setup time | tSU:STO | 4.7 |  |  | µs |  | 7 |
| Time the bus must be free before a new transmission can start | tBUF | 4.7 |  |  | µs |  | 7 |
| Input capacitance (SCL) | CIN |  |  | 7 | pF |  | 16 |
| Output capacitance (SDA, FT/OUT) | COUT |  |  | 10 | pF |  | 16 |
| Low-pass filter input time constant (SDA and SCL) | tLP | 250 |  | 1000 | ns |  | 16 |
| SCL and SDA at VIH before power down | tPD | 0 |  |  | ns |  | 17 |
| SCL and SDA at VIH after power up | tREC | 10 |  |  | µs |  | 17 |
| Battery backup switchover voltage (VSO), printed as VBAT minus offset | VSO | -0.8 | -0.5 | -0.3 | V |  | 17 |
| Series resistance (ESR, max per note 4) | RS |  |  | 110 | k | VCC or VBAT > 2.5 V | 16 |
| Series resistance | RS |  | 60 |  | k |  | 16 |
| Resonant frequency | fO |  | 32.768 |  | kHz |  | 16 |
| Load capacitance | CL |  | 12.5 |  | pF |  | 16 |

## CAD (KiCad official)

- Symbol: `HT4116ARMZ`
- Footprint: `Package_SO:MSOP-8_3x3mm_P0.65mm`
- 3D model: MSOP-8 (KiCad packages3D, STEP)
- 3D model files: `ht4116armz-etched.step` / `ht4116armz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht4116armz.step` / `ht4116armz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTCSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590454424792428544) (22 pp, sha256 `83c38d91f2138b9d`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/ht4116armz-datasheet.pdf)