Datasheet

74HC_HCT240_3 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 03 — 2 August 2007 3 of 18
NXP Semiconductors
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
5. Pinning information
5.1 Pinning
5.2 Pin description
(1) The die substrate is attached to this pad using
conductive die attach material. It can not be used as
supply pin or input
Fig 4. Pin configuration DIP20, SO20, (T)SSOP20 Fig 5. Pin configuration DHVQFN20
74HC240
74HCT240
1OE V
CC
1A0 2OE
2Y0 1Y0
1A1 2A0
2Y1 1Y1
1A2 2A1
2Y2 1Y2
1A3 2A2
2Y3 1Y3
GND 2A3
001aag233
1
2
3
4
5
6
7
8
9
10
12
11
14
13
16
15
18
17
20
19
001aag234
74HC240
74HCT240
Transparent top view
1Y3
1A3
2Y3
GND
(1)
2A2
2Y2 1Y2
1A2 2A1
2Y1 1Y1
1A1 2A0
2Y0 1Y0
1A0 2OE
GND
2A3
1OE V
CC
9
12
8 13
7 14
6 15
5 16
4 17
3 18
2 19
10 11
1
20
terminal 1
index area
Table 2. Pin description
Symbol Pin Description
1
OE 1 output enable input (active LOW)
1A0 2 data input
2Y0 3 bus output
1A1 4 data input
2Y1 5 bus output
1A2 6 data input
2Y2 7 bus output
1A3 8 data input
2Y3 9 bus output
GND 10 ground (0 V)
2A3 11 data input
1Y3 12 bus output
2A2 13 data input
1Y2 14 bus output
2A1 15 data input
1Y1 16 bus output