Datasheet

74AHC_AHCT244_5 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 05 — 20 December 2007 3 of 16
NXP Semiconductors
74AHC244; 74AHCT244
Octal buffer/line driver; 3-state
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
a supply pin or input.
Fig 4. Pin configuration SO20, TSSOP20 Fig 5. Pin configuration DHVQFN20
74AHC244
74AHCT244
1OE V
CC
1A0 2OE
2Y0 1Y0
1A1 2A0
2Y1 1Y1
1A2 2A1
2Y2 1Y2
1A3 2A2
2Y3 1Y3
GND 2A3
001aae258
1
2
3
4
5
6
7
8
9
10
12
11
14
13
16
15
18
17
20
19
001aah079
74AHC244
74AHCT244
Transparent top view
1Y3
GND
(1)
1A3
2Y3
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)
1A[0:3] 2, 4, 6, 8 data input
2A[0:3] 17, 15, 13, 11 data input
1Y[0:3] 18, 16, 14, 12 data output
2Y[0:3] 3, 5, 7, 9 data output
GND 10 ground (0 V)
2
OE 19 output enable input (active LOW)
V
CC
20 supply voltage