Datasheet

74HC_HCT238_3 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 03 — 16 July 2007 4 of 18
NXP Semiconductors
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
5.2 Pin description
6. Functional description
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care.
Table 2. Pin description
Symbol Pin Description
A[0:2] 1, 2, 3 address input
E1 4 enable input (active LOW)
E2 5 enable input (active LOW)
E3 6 enable input (active HIGH)
Y[0:7] 15, 14, 13, 12, 11, 10, 9, 7 output (active HIGH)
GND 8 ground (0 V)
V
CC
16 supply voltage
Table 3. Function table
[1]
Inputs Outputs
E1 E2 E3 A0 A1 A2 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
HXXXXXLLLLLLLL
XHXXXXLLLLLLLL
XXLXXXLLLLLLLL
LLHLLLHLLLLLLL
LLHHLLLHLLLLLL
LLHLHLLLHLLLLL
LLHHHLLLLHLLLL
LLHLLHLLLLHLLL
LLHHLHLLLLLHLL
LLHLHHLLLLLLHL
LLHHHHLLLLLLLH