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SN74LS688DWR

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Texas Instruments Digital Comparators, SOIC-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LS688DWR

Texas Instruments · Digital Comparators · SOIC-20

SN74LS688DWR from Texas Instruments, in a SOIC-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 G̅ input Active-low enable input that, when low, allows the P=Q output to go low on equality (function table enable G).
2 P0 input P word data input bit 0, compared with Q0.
3 Q0 input Q word data input bit 0, compared with P0.
4 P1 input P word data input bit 1, compared with Q1.
5 Q1 input Q word data input bit 1, compared with P1.
6 P2 input P word data input bit 2, compared with Q2.
7 Q2 input Q word data input bit 2, compared with P2.
8 P3 input P word data input bit 3, compared with Q3.
9 Q3 input Q word data input bit 3, compared with P3.
10 GND power_in Ground.
11 P4 input P word data input bit 4, compared with Q4.
12 Q4 input Q word data input bit 4, compared with P4.
13 P5 input P word data input bit 5, compared with Q5.
14 Q5 input Q word data input bit 5, compared with P5.
15 P6 input P word data input bit 6, compared with Q6.
16 Q6 input Q word data input bit 6, compared with P6.
17 P7 input P word data input bit 7, compared with Q7.
18 Q7 input Q word data input bit 7, compared with P7.
19 P=Q output Active-low totem-pole identity output, low when P equals Q and G is low.
20 VCC power_in Positive supply voltage.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-20
Category Logic
Pins 20

CAD (KiCad official)

  • Symbol: SN74LS688DWR
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20 (KiCad packages3D, STEP)
  • 3D model files: sn74ls688dwr-etched.step / sn74ls688dwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls688dwr.step / sn74ls688dwr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (26 pp, sha256 a0bd34df5b6e904f, retrieved 2026-10-07, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (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