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5962R9582501VXC

Radiation Hardened 3-Line to 8-Line Decoder/Demultiplexer

Intersil 

HS-54C138RH

Typical Applications

Typical applications include systems which require multiple

input/output ports and memories. When the HS-54C138RH

is enabled one of the eight outputs will go low. This output

can be used to select a particular device or a group of

devices. The HS-54C138RH can also be cascaded to

provide an enabling scheme for larger systems and allow

one decoder to control eight other decoders as in Figure 1.

Figure 2 shows a configuration that can be used to enable

multiple I/O ports or memory devices. Up to 24 memory

devices or I/O ports can be controlled using this circuit.

For demultiplexer operation, one of the three enable inputs

is used as the data input while the other two inputs are

enable. The transmitted data is distributed to the proper

output as determined by the 3-line select inputs. See Figure

3.

TO OTHER

DEVICES

SELECT B

SELECT A

ENABLE

HS-54C138RH

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

“1” “0”

ENABLE

“1” “0”

ENABLE

“1” “0”

ENABLE

HS-54C138RH

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

HS-54C138RH

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

HS-54C138RH

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

FIGURE 1.

EN

EN

EN A4 A3

A2 A1 A0

G1 G2B G2A

CBA

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

G1 G2B G2A

CBA

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

G1 G2B G2A

CBA

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

PORT NUMBERS OR CHIP SELECTS

FIGURE 2.

2

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