S2	1  •	16	Vcc
B2	2	15	B3
A2	3	14	A3
S1	4	13	S3
A1	5	12	A4
B1	6	11	B4
CIN	7	10	S4
GND	8	9	COUT

Pin	Symbol	Description
1	S2	sum output
2	B2	B operand input
3	A2	A operand input
4	S1	sum output
5	A1	A operand input
6	B1	B operand input
7	CIN	carry input
8	GND	ground
9	COUT	carry output
10	S4	sum output
11	B4	B operand input
12	A4	A operand input
13	S3	sum output
14	A3	A operand input
15	B3	B operand input
16	Vcc	supply voltage

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

Parameter	Value	Unit
Propagation delay, CIN to S1	16 (74HC) 15 (74HCT)	ns
Propagation delay, CIN to S2	18 (74HC) 21 (74HCT)	ns
Propagation delay, CIN to S3	20 (74HC) 23 (74HCT)	ns
Propagation delay, CIN to S4	23 (74HC) 27 (74HCT)	ns
Propagation delay, An, Bn to Sn	21 (74HC) 25 (74HCT)	ns
Propagation delay, CIN to COUT	20 (74HC) 23 (74HCT)	ns
Propagation delay, An, Bn to COUT	20 (74HC) 24 (74HCT)	ns