SN74HC244 Octal Buffer

@@ -0,0 +1,73 @@+# SN74HC244++**Texas Instruments** · Buffer / Line Driver · SOIC-20++The SN74HC244 is an octal buffer and line driver built for 3-state bus interfacing. Its eight buffers are arranged as two 4-bit groups, each with its own active-low output-enable, so it can drive or isolate two nibble-wide buses independently.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1OE | input | Active-low output enable for the first 4-bit buffer (drives 1Y1..1Y4). When low, 1Y outputs follow 1A inputs; when high, 1Y outputs are placed in the high-impedance (3-state) state. |+| 2 | 1A1 | input | Data input 1 for the first 4-bit buffer. Buffered noninverted to output 1Y1 when 1OE is low. |+| 3 | 2Y4 | tri_state | 3-state buffered output 4 of the second 4-bit buffer. Follows input 2A4 when 2OE is low; Hi-Z when 2OE is high. Drives ±6mA at VCC = 5V. |+| 4 | 1A2 | input | Data input 2 for the first 4-bit buffer. Buffered noninverted to output 1Y2 when 1OE is low. |+| 5 | 2Y3 | tri_state | 3-state buffered output 3 of the second 4-bit buffer. Follows input 2A3 when 2OE is low; Hi-Z when 2OE is high. |+| 6 | 1A3 | input | Data input 3 for the first 4-bit buffer. Buffered noninverted to output 1Y3 when 1OE is low. |+| 7 | 2Y2 | tri_state | 3-state buffered output 2 of the second 4-bit buffer. Follows input 2A2 when 2OE is low; Hi-Z when 2OE is high. |+| 8 | 1A4 | input | Data input 4 for the first 4-bit buffer. Buffered noninverted to output 1Y4 when 1OE is low. |+| 9 | 2Y1 | tri_state | 3-state buffered output 1 of the second 4-bit buffer. Follows input 2A1 when 2OE is low; Hi-Z when 2OE is high. |+| 10 | GND | power_in | Device ground reference (0 V). Bond directly to the board ground plane. |+| 11 | 2A1 | input | Data input 1 for the second 4-bit buffer. Buffered noninverted to output 2Y1 when 2OE is low. |+| 12 | 1Y4 | tri_state | 3-state buffered output 4 of the first 4-bit buffer. Follows input 1A4 when 1OE is low; Hi-Z when 1OE is high. |+| 13 | 2A2 | input | Data input 2 for the second 4-bit buffer. Buffered noninverted to output 2Y2 when 2OE is low. |+| 14 | 1Y3 | tri_state | 3-state buffered output 3 of the first 4-bit buffer. Follows input 1A3 when 1OE is low; Hi-Z when 1OE is high. |+| 15 | 2A3 | input | Data input 3 for the second 4-bit buffer. Buffered noninverted to output 2Y3 when 2OE is low. |+| 16 | 1Y2 | tri_state | 3-state buffered output 2 of the first 4-bit buffer. Follows input 1A2 when 1OE is low; Hi-Z when 1OE is high. |+| 17 | 2A4 | input | Data input 4 for the second 4-bit buffer. Buffered noninverted to output 2Y4 when 2OE is low. |+| 18 | 1Y1 | tri_state | 3-state buffered output 1 of the first 4-bit buffer. Follows input 1A1 when 1OE is low; Hi-Z when 1OE is high. |+| 19 | 2OE | input | Active-low output enable for the second 4-bit buffer (drives 2Y1..2Y4). When low, 2Y outputs follow 2A inputs; when high, 2Y outputs are placed in the high-impedance (3-state) state. |+| 20 | VCC | power_in | Positive supply voltage, 2 V to 6 V (5 V nominal). ICC = 80 µA max. Decouple locally to GND with a 0.1 µF ceramic capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Octal buffer / line driver, 3-state |+| Logic family | 74HC (CMOS) |+| Supply voltage | 2 V to 6 V |+| Outputs | 8, 3-state, two 4-bit banks |+| Output current | +-6 mA at VCC = 4.5 V |+| Propagation delay | 11 ns typ at 5 V |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `SN74HC244DW`+- `SN74HC244DWR`+- `SN74HC244DB`+- `SN74HC244DBR`+- `SN74HC244PW`+- `SN74HC244PWR`+- `SN74HC244N`+- `SN74HC244NS`+- `SN74HC244NSR`+- `SN74HC244FK`+- `SN74HC244J`+- `SN74HC244W`++## CAD (KiCad official)++- Symbol: `sn74hc244.kicad_sym`+- Footprint: `sn74hc244.kicad_mod`+- 3D model: SOIC-20 wide body from KiCad `Package_SO/SOIC-20W_7.5x12.8mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74hc244.pdf) (42 pp, sha256 `89be5869d39fe0cb`, 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/sn74hc244-datasheet.pdf)

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