# DS14C89AMX

**Texas Instruments** · RS232 ICs · SOIC-14

DS14C89AMX from Texas Instruments, in a SOIC-14. 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 | 1A | input | Channel A EIA/TIA-232-E receiver input; accepts ±25 V signals; input threshold VTH 1.3-2.7 V, VTL 0.5-1.9 V; IIN up to ±8.3 mA at ±25 V. |
| 2 | 1C | passive | Channel A response-control pin; replaces external noise-filter capacitor of DS1489A; may be tied high, tied low, or left open (NC). |
| 3 | 1Y | output | Channel A TTL/CMOS logic output; VOH min 2.8 V at −3.2 mA, VOL max 0.4 V at +3.2 mA; output high for open input (fail-safe). |
| 4 | 2A | input | Channel B EIA/TIA-232-E receiver input; accepts ±25 V signals; input threshold VTH 1.3-2.7 V, VTL 0.5-1.9 V; IIN up to ±8.3 mA at ±25 V. |
| 5 | 2C | passive | Channel B response-control pin; replaces external noise-filter capacitor of DS1489A; may be tied high, tied low, or left open (NC). |
| 6 | 2Y | output | Channel B TTL/CMOS logic output; VOH min 2.8 V at −3.2 mA, VOL max 0.4 V at +3.2 mA; output high for open input (fail-safe). |
| 7 | GND | power_in | Ground reference (0 V). |
| 8 | 3Y | output | Channel C TTL/CMOS logic output; VOH min 2.8 V at −3.2 mA, VOL max 0.4 V at +3.2 mA; output high for open input (fail-safe). |
| 9 | 3C | passive | Channel C response-control pin; replaces external noise-filter capacitor of DS1489A; may be tied high, tied low, or left open (NC). |
| 10 | 3A | input | Channel C EIA/TIA-232-E receiver input; accepts ±25 V signals; input threshold VTH 1.3-2.7 V, VTL 0.5-1.9 V; IIN up to ±8.3 mA at ±25 V. |
| 11 | 4Y | output | Channel D TTL/CMOS logic output; VOH min 2.8 V at −3.2 mA, VOL max 0.4 V at +3.2 mA; output high for open input (fail-safe). |
| 12 | 4C | passive | Channel D response-control pin; replaces external noise-filter capacitor of DS1489A; may be tied high, tied low, or left open (NC). |
| 13 | 4A | input | Channel D EIA/TIA-232-E receiver input; accepts ±25 V signals; input threshold VTH 1.3-2.7 V, VTL 0.5-1.9 V; IIN up to ±8.3 mA at ±25 V. |
| 14 | VCC | power_in | Positive supply voltage; recommended operating range +4.5 V to +5.5 V; absolute maximum +6 V; ICC max 900 µA (no load). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Interface |
| Pins | 14 |

## 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 (recommended) | VCC | 4.5 |  | 5.5 | V | GND = 0V | 2 |
| Operating free air temperature (DS14C89A) | TA | 0 |  | 75 | °C | DS14C89A | 2 |
| Supply voltage VCC (absolute maximum) | VCC |  |  | 6 | V |  | 2 |
| Input voltage |  | -30 |  | 30 | V |  | 2 |
| Junction temperature |  |  |  | 150 | °C |  | 2 |
| Continuous power dissipation, D package |  |  |  | 1063 | mW | D package, @ +25°C | 2 |
| Storage temperature range |  | -65 |  | 150 | °C |  | 2 |
| Lead temperature (soldering) |  |  |  | 260 | °C | Soldering, 4 seconds | 2 |
| ESD rating |  | 1.8 | 2 |  | kV | HBM, 1.5 kΩ, 100 pF | 2 |
| Input high threshold | VTH | 1.3 |  | 2.7 | V |  | 3 |
| Input low threshold | VTL | 0.5 |  | 1.9 | V |  | 3 |
| Input current | IIN | 3.6 |  | 8.3 | mA | VIN = +25V, VCC = +4.5V to +5.5V | 3 |
| Input current | IIN | -8.3 |  | -3.6 | mA | VIN = -25V | 3 |
| Input current | IIN | 0.43 |  | 1 | mA | VIN = +3V | 3 |
| Input current | IIN | -1 |  | -0.43 | mA | VIN = -3V | 3 |
| Input current (power-off) | IIN | 2.14 |  | 5 | mA | VIN = +15V, VCC = 0V (Power-Off) | 3 |
| Input current (power-off) | IIN | -5 |  | -2.14 | mA | VIN = -15V, VCC = 0V (Power-Off) | 3 |
| Input current (power-off) | IIN | 0.43 |  | 1 | mA | VIN = +3V | 3 |
| Input current (power-off) | IIN | -1 |  | -0.43 | mA | VIN = -3V | 3 |
| Output high voltage | VOH | 2.8 | 4 |  | V | VIN = VTL (min), IOUT = −3.2 mA | 3 |
| Output high voltage | VOH | 3.5 | 4.7 |  | V | IOUT = −20μA | 3 |
| Output low voltage | VOL |  | 0.15 | 0.4 | V | VIN = VTH (max), IOUT = +3.2 mA | 3 |
| Supply current | ICC |  | 0.5 | 900 | μA | No Load, VIN = 2.7V or 0.5V | 3 |
| Propagation delay low to high | tPLH |  | 3.5 | 6.5 | μs | CI = 50 pF, input pulse width ≥ 10 μs | 3 |
| Propagation delay high to low | tPHL |  | 3.2 | 6.5 | μs | CI = 50 pF, input pulse width ≥ 10 μs | 3 |
| Output rise time | tr | 40 |  | 300 | ns | CI = 50 pF | 3 |
| Output fall time | tf | 40 |  | 300 | ns | CI = 50 pF | 3 |
| Pulse width assumed to be noise | tnw |  |  | 1 | μs |  | 3 |
| Typical input hysteresis | VHY |  | 1 |  | V |  | 3 |
| Typical propagation delay skew | tSK |  | 400 |  | ns | CI = 50 pF | 3 |

## CAD (KiCad official)

- Symbol: `DS14C89AMX`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `ds14c89amx-etched.step` / `ds14c89amx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds14c89amx.step` / `ds14c89amx.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ds14c89a) (16 pp, sha256 `a0c9ff903402214a`, retrieved 2026-10-20, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ds14c89amx-datasheet.pdf)