MC74AC138 Datasheet, PDF (1/7 Pages) ON Semiconductor – 1−of−8 Decoder/Demultiplexer

MC74AC138
MC74ACT138
1ĆofĆ8 Decoder/Demultiplexer
The MC74AC138/74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This
device is ideally suited for high-speed bipolar memory chip select address decoding.
The multiple input enables allow parallel expansion to a 1-of-24 decoder using just
three MC74AC138/74ACT138 devices or a 1-of-32 decoder using four MC74AC138/
74ACT138 devices and one inverter.
• Demultiplexing Capability
• Multiple Input Enable for Easy Expansion
• Active LOW Mutually Exclusive Outputs
• Outputs Source/Sink 24 mA
• ′ACT138 Has TTL Compatible Inputs
VCC _{O0 O1 O2 O3 O4 O5 O6}
16 15 14 13 12 11 10 9
1-OF-8 DECODER/
DEMULTIPLEXER
N SUFFIX
CASE 648-08
PLASTIC
12345678
A0 A1 A2 E1 E2 E3 O7 GND
PIN NAMES
A0–A2
E1–E2
E3
O0–O7
Address Inputs
Enable Inputs
Enable Input
Outputs
D SUFFIX
CASE 751B-05
PLASTIC
LOGIC SYMBOL
A0 A1 A2
E1 E2 E3
O0 O1 O2 O3 O4 O5 O6 O7
FACT DATA
5-1