74240

Octal buffer/line driver; 3-state; inverting


1OE	1 •	20	Vcc
1A0	2	19	2OE
2Y0	3	18	1Y0
1A1	4	17	2A0
2Y1	5	16	1Y1
1A2	6	15	2A1
2Y2	7	14	1Y2
1A3	8	13	2A2
2Y3	9	12	1Y3
GND	10	11	2A3

Pin	Symbol	Description
1	1OE	output enable (active low)
2	1A0	data input
3	2Y0	bus output
4	1A1	data input
5	2Y1	bus output
6	1A2	data input
7	2Y2	bus output
8	1A3	data input
9	2Y3	bus output
10	GND	ground
11	2A3	data input
12	1Y3	bus output
13	2A2	data input
14	1Y2	bus output
15	2A1	data input
16	1Y1	bus output
17	2A0	data input
18	1Y0	bus output
19	2OE	output enable (active low)
20	Vcc	supply voltage

Specifications

(typical values under recommended operating conditions, unless specified)

Parameter	Value	Unit
Propagation delay, nAn to nYn	9 (74HC/HCT)	ns

Notes

Setting 1OE or 2OE high causes the outputs to assume a high-impedance off state.

Note: Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.