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CD74ACT299M96
Public Made by Adomby adom
Texas Instruments Shift Registers, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCD74ACT299M96
Texas Instruments · Shift Registers · SOIC-20-300mil
CD74ACT299M96 from Texas Instruments, in a SOIC-20-300mil. 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 | S0 | input | Mode select 0; together with S1 selects hold, shift right, shift left or parallel load, and when S0 and S1 are both high the I/O pins are high-impedance inputs. |
| 2 | !OE1 | input | Active-low output enable 1; when high the I/O terminals are forced to the off (high-impedance) state. |
| 3 | !OE2 | input | Active-low output enable 2; when high the I/O terminals are forced to the off (high-impedance) state. |
| 4 | I/O6 | bidirectional | Parallel data input/output 6, a three-state output and CMOS-buffered input. |
| 5 | I/O4 | bidirectional | Parallel data input/output 4, a three-state output and CMOS-buffered input. |
| 6 | I/O2 | bidirectional | Parallel data input/output 2, a three-state output and CMOS-buffered input. |
| 7 | I/O0 | bidirectional | Parallel data input/output 0, a three-state output and CMOS-buffered input. |
| 8 | Q0 | output | Serial output from the first register stage, used for cascading to the DS7 input of the previous register. |
| 9 | !MR | input | Master reset, active low; on the 299 it asynchronously clears the register regardless of all other inputs. |
| 10 | GND | power_in | Ground. |
| 11 | DS0 | input | Serial data input for right shift, sampled on the low-to-high transition of CP. |
| 12 | CP | input | Clock input, rising-edge triggered; mode select, serial data and parallel data respond only to its low-to-high transition. |
| 13 | I/O1 | bidirectional | Parallel data input/output 1, a three-state output and CMOS-buffered input. |
| 14 | I/O3 | bidirectional | Parallel data input/output 3, a three-state output and CMOS-buffered input. |
| 15 | I/O5 | bidirectional | Parallel data input/output 5, a three-state output and CMOS-buffered input. |
| 16 | I/O7 | bidirectional | Parallel data input/output 7, a three-state output and CMOS-buffered input. |
| 17 | Q7 | output | Serial output from the last register stage, used for cascading to the DS0 input of the next register. |
| 18 | DS7 | input | Serial data input for left shift, sampled on the low-to-high transition of CP. |
| 19 | S1 | input | Mode select 1; together with S0 selects hold, shift right, shift left or parallel load. |
| 20 | VCC | power_in | Positive supply; 4.5 V to 5.5 V recommended for ACT types, with a 0.1 µF bypass capacitor placed close to the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-300mil |
| Category | Logic |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
CD74ACT299M96 - Footprint:
Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm - 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files:
cd74act299m96-etched.step/cd74act299m96-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd74act299m96.step/cd74act299m96.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (25 pp, sha256
fbcafb13deed4fbf, retrieved 2026-10-11, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-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).