NXP Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
4. Functional diagram
2
1A0
1Y0
18
4
1A1
1Y1
16
6
1A2
1Y2
14
8
1
1A3
1OE
1Y3
12
17
2A0
2Y0
3
15
2A1
2Y1
5
13
2A2
2Y2
7
11
19
2A3
2OE
2Y3
9
mna875
Fig 1.
Functional diagram
1
EN
18
16
14
12
1A0
2
18
1Y0
2A0
17
3
2Y0
2
4
1A1
4
16
1Y1
2A1
15
5
2Y1
6
8
1A2
6
14
1Y2
2A2
13
7
2Y2
19
EN
9
7
5
3
mna873
1A3
1OE
8
1
12
1Y3
2A3
2OE
11
19
9
2Y3
11
13
mna874
15
17
Fig 2.
Logic symbol
Fig 3.
IEC logic symbol
74HC_HCT244
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 24 September 2012
2 of 18