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SN74LS688N

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Texas Instruments Pre-ordered Chips, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LS688N

Texas Instruments · Pre-ordered Chips · PDIP-20

SN74LS688N from Texas Instruments, in a PDIP-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 with hysteresis; a high level forces the P=Q output high, and the input is rated up to 7 V.
2 P0 input P word data input bit 0 with hysteresis, rated up to 7 V.
3 Q0 input Q word data input bit 0 with hysteresis, rated up to 7 V.
4 P1 input P word data input bit 1 with hysteresis, rated up to 7 V.
5 Q1 input Q word data input bit 1 with hysteresis, rated up to 7 V.
6 P2 input P word data input bit 2 with hysteresis, rated up to 7 V.
7 Q2 input Q word data input bit 2 with hysteresis, rated up to 7 V.
8 P3 input P word data input bit 3 with hysteresis, rated up to 7 V.
9 Q3 input Q word data input bit 3 with hysteresis, rated up to 7 V.
10 GND power_in Ground, the network ground terminal to which all voltage values are referenced.
11 P4 input P word data input bit 4 with hysteresis, rated up to 7 V.
12 Q4 input Q word data input bit 4 with hysteresis, rated up to 7 V.
13 P5 input P word data input bit 5 with hysteresis, rated up to 7 V.
14 Q5 input Q word data input bit 5 with hysteresis, rated up to 7 V.
15 P6 input P word data input bit 6 with hysteresis, rated up to 7 V.
16 Q6 input Q word data input bit 6 with hysteresis, rated up to 7 V.
17 P7 input P word data input bit 7 with hysteresis, rated up to 7 V.
18 Q7 input Q word data input bit 7 with hysteresis, rated up to 7 V.
19 P=Q output Active-low totem-pole identity output that goes low when P equals Q, with recommended IOH of -400 µA and IOL of 24 mA for the SN74LS parts.
20 VCC power_in Supply voltage, recommended 4.85 V to 5.25 V for SN74LS688 with an absolute maximum of 7 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package PDIP-20
Category Interface ICs
Pins 20

CAD (KiCad official)

  • Symbol: SN74LS688N
  • Footprint: Package_DIP:DIP-20_W7.62mm
  • 3D model: PDIP-20 (KiCad packages3D, STEP)
  • 3D model files: sn74ls688n-etched.step / sn74ls688n-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls688n.step / sn74ls688n.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (24 pp, sha256 5d405f27e656dcdf, retrieved 2026-10-28, 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