Standard Products
UT54ACS138/UT54ACTS138
3-Line to 8-Line Decoders/Demultiplexers
Datasheet
November 2010
www.aeroflex.com/logic
FEATURES
PINOUTS
16-Pin DIP
Top View
1.2μ CMOS
- Latchup immune
High speed
A
1
16
VDD
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
- 16-pin DIP
- 16-lead flatpack
UT54ACS138 - SMD 5962-96544
UT54ACTS138 - SMD 5962-96545
B
C
2
3
4
5
6
7
8
15
14
13
12
11
10
9
Y0
Y1
Y2
Y3
Y4
Y5
Y6
G2A
G2B
G1
Y7
VSS
DESCRIPTION
16-Lead Flatpack
Top View
The UT54ACS138 and the UT54ACTS138 3-line to 8-line de-
coders/demultiplexers are designed to be used in high-perfor-
mance memory-decoding or data-routing applications requiring
very short propagation delay times.
A
1
16
VDD
B
C
2
3
4
5
6
7
8
15
14
13
12
11
10
9
Y0
Y1
Y2
Y3
Y4
Y5
Y6
The conditions at the binary select inputs and the three enable
inputs select one of eight output lines. Two active-low and one
active-high enable inputs reduce the need for external gates of
inverters when expanding. A 24-line decoder can be implement-
ed without external inverters and a 32-line decoder requiresonly
one inverter. An enable input can be used as a data input for
demultiplexing applications.
G2A
G2B
G1
Y7
VSS
The devices are characterized over full military temperature
range of -55°C to +125°C.
FUNCTION TABLE
ENABLE INPUTS
SELECT INPUTS
OUTPUT
G1
X
G2A
X
X
H
L
G2B
C
X
X
X
L
B
X
X
X
L
A
X
X
X
L
Y0
H
H
H
L
Y1
H
H
H
H
L
Y2
H
H
H
H
H
L
Y3
H
H
H
H
H
H
L
Y4
H
H
H
H
H
H
H
L
Y5
H
H
H
H
H
H
H
H
L
Y6
H
H
H
H
H
H
H
H
H
L
Y7
H
H
H
H
H
H
H
H
H
H
L
H
X
X
L
L
L
L
L
L
L
L
L
X
H
H
H
H
H
H
H
H
L
L
L
H
L
H
H
H
H
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
L
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
L
H
L
H
H
H
L
H
H
H
H
1
L
H
H