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SN74HC688PWR

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Texas Instruments Comparators, TSSOP-20. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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SN74HC688PWR

Texas Instruments · Comparators · TSSOP-20

SN74HC688PWR 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 OE input Active-low output enable. When held high, the P=Q output is forced to the high level regardless of the data inputs; when held low, the comparator output reflects the P vs Q comparison.
2 P0 input Bit 0 of the P input word. Compared against Q0 by an internal XNOR stage; must be driven to a valid CMOS level (VIH/VIL per Recommended Operating Conditions).
3 Q0 input Bit 0 of the Q input word. Compared against P0 by an internal XNOR stage.
4 P1 input Bit 1 of the P input word. Compared against Q1.
5 Q1 input Bit 1 of the Q input word. Compared against P1.
6 P2 input Bit 2 of the P input word. Compared against Q2.
7 Q2 input Bit 2 of the Q input word. Compared against P2.
8 P3 input Bit 3 of the P input word. Compared against Q3.
9 Q3 input Bit 3 of the Q input word. Compared against P3.
10 GND power_in Ground reference (0 V). Return path for VCC supply current and logic input/output reference.
11 P4 input Bit 4 of the P input word. Compared against Q4.
12 Q4 input Bit 4 of the Q input word. Compared against P4.
13 P5 input Bit 5 of the P input word. Compared against Q5.
14 Q5 input Bit 5 of the Q input word. Compared against P5.
15 P6 input Bit 6 of the P input word. Compared against Q6.
16 Q6 input Bit 6 of the Q input word. Compared against P6.
17 P7 input Bit 7 (MSB) of the P input word. Compared against Q7.
18 Q7 input Bit 7 (MSB) of the Q input word. Compared against P7.
19 P=Q output Active-low equality output. Drives low when all eight P bits equal the corresponding Q bits and OE is low; drives high otherwise or whenever OE is high. Rated for ±4 mA drive at 5 V (up to 10 LSTTL loads).
20 VCC power_in Positive supply voltage, 2 V to 6 V (5 V nominal). A 0.1-µF bypass capacitor placed close to this pin is recommended; paralleling with a 1-µF cap is common.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TSSOP-20
Category Op-amp/Cmp
Pins 20

Ordering variants

Same part, different packaging or reel option.

  • SN74HC688PWR
  • SN74HC688PWRE4
  • SN74HC688PWRPWT
  • SN74HC688PWRDW
  • SN74HC688PWRDWR
  • SN74HC688PWRDWRE4
  • SN74HC688PWRDWRG4
  • SN74HC688PWRN
  • SN74HC688PWRJ
  • SN74HC688PWRFK

CAD (KiCad official)

  • Symbol: SN74HC688PWR
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: sn74hc688pwr-etched.step / sn74hc688pwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74hc688pwr.step / sn74hc688pwr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (24 pp, sha256 d600a33f4ebb7089, 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