CPAB	1  •	24	Vcc
SAB	2	23	CPBA
DIR	3	22	SBA
A0	4	21	OE
A1	5	20	B0
A2	6	19	B1
A3	7	18	B2
A4	8	17	B3
A5	9	16	B4
A6	10	15	B5
A7	11	14	B6
GND	12	13	B7

Pin	Symbol	Description
1	CPAB	A to B clock input (low-to-high, edge-triggered)
2	SAB	select A to B source input
3	DIR	direction control input
4	A0	A data input/output
5	A1	A data input/output
6	A2	A data input/output
7	A3	A data input/output
8	A4	A data input/output
9	A5	A data input/output
10	A6	A data input/output
11	A7	A data input/output
12	GND	ground
13	B7	B data input/output
14	B6	B data input/output
15	B5	B data input/output
16	B4	B data input/output
17	B3	B data input/output
18	B2	B data input/output
19	B1	B data input/output
20	B0	B data input/output
21	OE	output enable (active low)
22	SBA	select B to A source input
23	CPBA	B to A clock input (low-to-high, edge-triggered)
24	Vcc	supply voltage

Specifications
(typical values under recommended operating conditions, unless specified)

Parameter	Value	Unit
Propagation delay, An , Bn to Bn , An	11 (74HC) 13 (74HCT)	ns
Maximum clock frequency	69 (74HC) 85 (74HCT)	MHz