# 74LCX244MTC

**onsemi** · Buffers / Drivers · TSSOP-20

74LCX244MTC from onsemi, in a TSSOP-20. 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 | OE1 | input | Active-low 3-STATE output enable input for the first buffer group (O0-O3); HIGH puts those outputs in high impedance. |
| 2 | I0 | input | Data input to buffer driving O0; 5V tolerant (VI up to 5.5V). |
| 3 | O4 | tri_state | 3-STATE output of the second buffer group, enabled by OE2, follows I4 and drives up to ±24mA at VCC = 3.0V. |
| 4 | I1 | input | Data input to buffer driving O1; 5V tolerant (VI up to 5.5V). |
| 5 | O5 | tri_state | 3-STATE output of the second buffer group, enabled by OE2, follows I5 and drives up to ±24mA at VCC = 3.0V. |
| 6 | I2 | input | Data input to buffer driving O2; 5V tolerant (VI up to 5.5V). |
| 7 | O6 | tri_state | 3-STATE output of the second buffer group, enabled by OE2, follows I6 and drives up to ±24mA at VCC = 3.0V. |
| 8 | I3 | input | Data input to buffer driving O3; 5V tolerant (VI up to 5.5V). |
| 9 | O7 | tri_state | 3-STATE output of the second buffer group, enabled by OE2, follows I7 and drives up to ±24mA at VCC = 3.0V. |
| 10 | GND | power_in | Ground reference; maximum ground current ±100mA per ground pin. |
| 11 | I7 | input | Data input to buffer driving O7; 5V tolerant (VI up to 5.5V). |
| 12 | O3 | tri_state | 3-STATE output of the first buffer group, enabled by OE1, follows I3 and drives up to ±24mA at VCC = 3.0V. |
| 13 | I6 | input | Data input to buffer driving O6; 5V tolerant (VI up to 5.5V). |
| 14 | O2 | tri_state | 3-STATE output of the first buffer group, enabled by OE1, follows I2 and drives up to ±24mA at VCC = 3.0V. |
| 15 | I5 | input | Data input to buffer driving O5; 5V tolerant (VI up to 5.5V). |
| 16 | O1 | tri_state | 3-STATE output of the first buffer group, enabled by OE1, follows I1 and drives up to ±24mA at VCC = 3.0V. |
| 17 | I4 | input | Data input to buffer driving O4; 5V tolerant (VI up to 5.5V). |
| 18 | O0 | tri_state | 3-STATE output of the first buffer group, enabled by OE1, follows I0 and drives up to ±24mA at VCC = 3.0V. |
| 19 | OE2 | input | Active-low 3-STATE output enable input for the second buffer group (O4-O7); HIGH puts those outputs in high impedance. |
| 20 | VCC | power_in | Supply voltage, 2.0V to 3.6V operating (2.3V to 3.6V specified), absolute maximum 7.0V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TSSOP-20 |
| Category | Logic ICs |
| Pins | 20 |

## 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, Operating | VCC | 2 |  | 3.6 | V | Operating | 4 |
| Supply Voltage, Data Retention | VCC | 1.5 |  | 3.6 | V | Data Retention | 4 |
| Input Voltage | VI | 0 |  | 5.5 | V |  | 4 |
| Output Voltage 3-STATE | VO | 0 |  | 5.5 | V | 3-STATE | 4 |
| Free-Air Operating Temperature | TA | -40 |  | 85 | °C |  | 4 |
| Input Edge Rate | Δt/ΔV | 0 |  | 10 | ns/V | VIN = 0.8V-2.0V, VCC = 3.0V | 4 |
| Supply Voltage | VCC | -0.5 |  | 7 | V |  | 4 |
| DC Input Voltage | VI | -0.5 |  | 7 | V |  | 4 |
| DC Output Voltage, 3-STATE | VO | -0.5 |  | 7 | V | Output in 3-STATE | 4 |
| Storage Temperature | TSTG | -65 |  | 150 | °C |  | 4 |
| DC Output Source/Sink Current | IO | -50 |  | 50 | mA |  | 4 |
| HIGH Level Input Voltage | VIH | 1.7 |  |  | V | VCC 2.3-2.7V, TA = -40°C to +85°C | 5 |
| HIGH Level Input Voltage | VIH | 2 |  |  | V | VCC 2.7-3.6V, TA = -40°C to +85°C | 5 |
| LOW Level Input Voltage | VIL |  |  | 0.7 | V | VCC 2.3-2.7V | 5 |
| LOW Level Input Voltage | VIL |  |  | 0.8 | V | VCC 2.7-3.6V | 5 |
| HIGH Level Output Voltage | VOH | 1.8 |  |  | V | VCC 2.3V, IOH = -8mA | 5 |
| HIGH Level Output Voltage | VOH | 2.2 |  |  | V | VCC 2.7V, IOH = -12mA | 5 |
| HIGH Level Output Voltage | VOH | 2.4 |  |  | V | VCC 3.0V, IOH = -18mA | 5 |
| LOW Level Output Voltage | VOL |  |  | 0.2 | V | VCC 2.3-3.6V, IOL = 100µA | 5 |
| LOW Level Output Voltage | VOL |  |  | 0.6 | V | VCC 2.3V, IOL = 8mA | 5 |
| LOW Level Output Voltage | VOL |  |  | 0.4 | V | VCC 2.7V, IOL = 12mA | 5 |
| LOW Level Output Voltage | VOL |  |  | 0.55 | V | VCC 3.0V, IOL = 24mA | 5 |
| Input Leakage Current | II | -5 |  | 5 | µA | VCC 2.3-3.6V, 0 ≤ VI ≤ 5.5V | 5 |
| 3-STATE Output Leakage | IOZ | -5 |  | 5 | µA | VCC 2.3-3.6V, 0 ≤ VO ≤ 5.5V, VI = VIH or VIL | 5 |
| Power-Off Leakage Current | IOFF |  |  | 10 | µA | VCC 0, VI or VO = 5.5V | 5 |
| Quiescent Supply Current | ICC |  |  | 10 | µA | VCC 2.3-3.6V, VI = VCC or GND | 5 |
| Quiescent Supply Current | ICC | -10 |  | 10 | µA | VCC 2.3-3.6V, 3.6V ≤ VI, VO ≤ 5.5V (outputs disabled or 3-STATE only) | 5 |
| Increase in ICC per Input | ΔICC |  |  | 500 | µA | VCC 2.3-3.6V, VIH = VCC - 0.6V | 5 |
| Propagation Delay, Data to Output | tPHL, tPLH | 1.5 |  | 6.5 | ns | VCC = 3.3V ± 0.3V, CL = 50pF, RL = 500Ω | 5 |
| Propagation Delay, Data to Output | tPHL, tPLH | 1.5 |  | 7.5 | ns | VCC = 2.7V, CL = 50pF, RL = 500Ω | 5 |
| Propagation Delay, Data to Output | tPHL, tPLH | 1.5 |  | 7.8 | ns | VCC = 2.5V ± 0.2V, CL = 30pF, RL = 500Ω | 5 |
| Output Enable Time | tPZL, tPZH | 1.5 |  | 8 | ns | VCC = 3.3V ± 0.3V, CL = 50pF, RL = 500Ω | 5 |
| Output Enable Time | tPZL, tPZH | 1.5 |  | 9 | ns | VCC = 2.7V, CL = 50pF, RL = 500Ω | 5 |
| Output Enable Time | tPZL, tPZH | 1.5 |  | 10 | ns | VCC = 2.5V ± 0.2V, CL = 30pF, RL = 500Ω | 5 |
| Output Disable Time | tPLZ, tPHZ | 1.5 |  | 7 | ns | VCC = 3.3V ± 0.3V, CL = 50pF, RL = 500Ω | 5 |
| Output Disable Time | tPLZ, tPHZ | 1.5 |  | 8 | ns | VCC = 2.7V, CL = 50pF, RL = 500Ω | 5 |
| Output Disable Time | tPLZ, tPHZ | 1.5 |  | 8.4 | ns | VCC = 2.5V ± 0.2V, CL = 30pF, RL = 500Ω | 5 |
| Output to Output Skew | tOSHL, tOSLH |  |  | 1 | ns | RL = 500Ω | 5 |
| Input Capacitance | CIN |  | 7 |  | pF | VCC = Open, VI = 0V or VCC | 6 |
| Output Capacitance | COUT |  | 8 |  | pF | VCC = 3.3V, VI = 0V or VCC | 6 |
| Power Dissipation Capacitance | CPD |  | 25 |  | pF | VCC = 3.3V, VI = 0V or VCC, f = 10MHz | 6 |

## CAD (KiCad official)

- Symbol: `74LCX244MTC`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74lcx244mtc-etched.step` / `74lcx244mtc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74lcx244mtc.step` / `74lcx244mtc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/74lcx244mtc-d.pdf) (16 pp, sha256 `ffa4510bfdeb6e9f`, retrieved 2026-10-24, tier: manufacturer)
- **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/74lcx244mtc-datasheet.pdf)