SN74HC193DR from Texas Instruments, in a SOIC-16. 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	B	input	Parallel data input B (bit 1). Preset value loaded into flip-flop QB when LOAD is low. High-level input threshold 3.15 V at VCC=4.5 V; input current 1 uA max.
2	QB	output	Counter data output bit 1 (QB). CMOS push-pull output; +/-4 mA drive at 5 V; can drive up to 10 LSTTL loads.
3	QA	output	Counter data output bit 0 (QA, LSB). CMOS push-pull output; +/-4 mA drive at 5 V.
4	DOWN	input	Count-down clock input. Counter decrements on a low-to-high transition of DOWN while UP is held high. Rise/fall time <= 500 ns at VCC=4.5 V.
5	UP	input	Count-up clock input. Counter increments on a low-to-high transition of UP while DOWN is held high.
6	QC	output	Counter data output bit 2 (QC). CMOS push-pull output; +/-4 mA drive at 5 V.
7	QD	output	Counter data output bit 3 (QD, MSB). CMOS push-pull output; +/-4 mA drive at 5 V.
8	GND	power_in	Ground reference (0 V). Continuous current through VCC or GND +/-50 mA max.
9	D	input	Parallel data input D (bit 3, MSB). Preset value loaded into flip-flop QD when LOAD is low.
10	C	input	Parallel data input C (bit 2). Preset value loaded into flip-flop QC when LOAD is low.
11	LOAD	input	Asynchronous parallel-load enable, active-low. Driving LOAD low forces the counter outputs to match the A/B/C/D data inputs, independent of the count clocks.
12	CO	output	Carry output, active-low. Produces a low-level pulse when the count reaches maximum (15) and UP is low. Feed to the UP input of the next stage to cascade counters.
13	BO	output	Borrow output, active-low. Produces a low-level pulse when the count is zero (all outputs low) and DOWN is low. Feed to the DOWN input of the next stage to cascade counters.
14	CLR	input	Asynchronous clear, active-high. When high, forces all Q outputs to logic low regardless of LOAD, data, or count inputs.
15	A	input	Parallel data input A (bit 0, LSB). Preset value loaded into flip-flop QA when LOAD is low.
16	VCC	power_in	Positive supply voltage. Operating range 2 V to 6 V (5 V nominal); absolute max 7 V. Quiescent current 80 uA max.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-16
Category	Logic
Pins	16

Ordering variants

Same part, different packaging or reel option.

SN74HC193DRD
SN74HC193DR
SN74HC193DRDT
SN74HC193DRN
SN74HC193DRNSR
SN74HC193DRPW
SN74HC193DRPWR
SN74HC193DRPWT
SN74HC193DRJ
SN74HC193DRW
SN74HC193DRFK

CAD (KiCad official)

Symbol: SN74HC193DR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Texas Instruments datasheet (23 pp, sha256 6ce6f3e3f359c50c, 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