hs-54c138rh Intersil Corporation, hs-54c138rh Datasheet - Page 5

• Manufacturer Part Number: hs-54c138rh
• Description: Radiation Hardened 3-line To 8-line Decoder/demultiplexer
• Manufacturer: Intersil Corporation

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.
TO OTHER
DEVICES
G1 G2B G2A
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
EN
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
HS-54C138RH
C
B
“1”
A
“0”
ENABLE
PORT NUMBERS OR CHIP SELECTS
INPUT
DATA
G1 G2B G2A
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
G1 G2B G2A
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
HS-54C138RH
EN
SELECT B
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
EN
FIGURE 1
FIGURE 2
FIGURE 3
EN
HS-54C138RH
5
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.
C
C
B
“1”
B
A
“0”
A
ENABLE
EN A4
G1 G2B G2A
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
SELECT A
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
A3
HS-54C138RH
HS-54C138RH
A2 A1 A0
Spec Number
C
ENABLE
“1”
B
“0”
A
ENABLE
518053