SN74HCT244PWR

@@ -0,0 +1,71 @@+# SN74HCT244PWR++**Texas Instruments** · Buffer/Driver/Transceiver · TSSOP-20++SN74HCT244PWR from Texas Instruments, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1OE | input | Active-low output enable for bank 1 (buffers 1A1-1A4 → 1Y1-1Y4). When low, bank 1 outputs pass the A input data. When high, bank 1 outputs are placed in the high-impedance state. Must be tied to VCC through a pull-up for high-Z during power up/down. |+| 2 | 1A1 | input | Bank 1 buffer input 1. TTL-compatible CMOS input; buffered non-inverting to 1Y1 when 1OE is low. VIH ≥ 2 V, VIL ≤ 0.8 V at VCC = 4.5-5.5 V; input current ≤ ±1 µA. |+| 3 | 2Y4 | tri_state | Bank 2 buffer output 4. 3-state, non-inverting output driven by 2A4 when 2OE is low; high-impedance when 2OE is high. ±6 mA output drive at 5 V. |+| 4 | 1A2 | input | Bank 1 buffer input 2. TTL-compatible CMOS input; buffered non-inverting to 1Y2 when 1OE is low. |+| 5 | 2Y3 | tri_state | Bank 2 buffer output 3. 3-state, non-inverting output driven by 2A3 when 2OE is low; high-impedance when 2OE is high. |+| 6 | 1A3 | input | Bank 1 buffer input 3. TTL-compatible CMOS input; buffered non-inverting to 1Y3 when 1OE is low. |+| 7 | 2Y2 | tri_state | Bank 2 buffer output 2. 3-state, non-inverting output driven by 2A2 when 2OE is low; high-impedance when 2OE is high. |+| 8 | 1A4 | input | Bank 1 buffer input 4. TTL-compatible CMOS input; buffered non-inverting to 1Y4 when 1OE is low. |+| 9 | 2Y1 | tri_state | Bank 2 buffer output 1. 3-state, non-inverting output driven by 2A1 when 2OE is low; high-impedance when 2OE is high. |+| 10 | GND | power_in | Device ground reference (0 V). |+| 11 | 2A1 | input | Bank 2 buffer input 1. TTL-compatible CMOS input; buffered non-inverting to 2Y1 when 2OE is low. |+| 12 | 1Y4 | tri_state | Bank 1 buffer output 4. 3-state, non-inverting output driven by 1A4 when 1OE is low; high-impedance when 1OE is high. |+| 13 | 2A2 | input | Bank 2 buffer input 2. TTL-compatible CMOS input; buffered non-inverting to 2Y2 when 2OE is low. |+| 14 | 1Y3 | tri_state | Bank 1 buffer output 3. 3-state, non-inverting output driven by 1A3 when 1OE is low; high-impedance when 1OE is high. |+| 15 | 2A3 | input | Bank 2 buffer input 3. TTL-compatible CMOS input; buffered non-inverting to 2Y3 when 2OE is low. |+| 16 | 1Y2 | tri_state | Bank 1 buffer output 2. 3-state, non-inverting output driven by 1A2 when 1OE is low; high-impedance when 1OE is high. |+| 17 | 2A4 | input | Bank 2 buffer input 4. TTL-compatible CMOS input; buffered non-inverting to 2Y4 when 2OE is low. |+| 18 | 1Y1 | tri_state | Bank 1 buffer output 1. 3-state, non-inverting output driven by 1A1 when 1OE is low; high-impedance when 1OE is high. |+| 19 | 2OE | input | Active-low output enable for bank 2 (buffers 2A1-2A4 → 2Y1-2Y4). When low, bank 2 outputs pass the A input data. When high, bank 2 outputs are placed in the high-impedance state. |+| 20 | VCC | power_in | Positive supply rail, 4.5 V to 5.5 V (recommended). Absolute max 7 V. Decouple locally to GND with a 0.1 µF ceramic capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-20 |+| Category | Logic |+| Pins | 20 |++## Ordering variants++- `SN74HCT244PWRPW`+- `SN74HCT244PWRPWR`+- `SN74HCT244PWRDB`+- `SN74HCT244PWRDBR`+- `SN74HCT244PWRDW`+- `SN74HCT244PWRDWR`+- `SN74HCT244PWRN`+- `SN74HCT244PWRNS`+- `SN74HCT244PWRNSR`+- `SN74HCT244PWRDGS`+- `SN74HCT244PWRDGSR`+- `SN74HCT244PWRJ`+- `SN74HCT244PWRFK`++## CAD (KiCad official)++- Symbol: `SN74HCT244PWR`+- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`+- 3D model: TSSOP-20 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74hct244.pdf) (38 pp, sha256 `5d3df17f40ffa6fd`, retrieved 2026-08-17, tier: manufacturer)+- **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/sn74hct244pwr-datasheet.pdf)

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