74hct138a IK Semicon Co., Ltd, 74hct138a Datasheet

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74hct138a

Manufacturer Part Number
74hct138a
Description
1-of-8 Decoder/demultiplexer
Manufacturer
IK Semicon Co., Ltd
Datasheet
1-of-8 Decoder/Demultiplexer
High-Performance Silicon-Gate CMOS
IN74HCT138A may be used as a level converter for interfacing TTL or
NMOS outputs to High Speed CMOS inputs.
active-lot outputs. This device features three Chip Select inputs, two
active-low and one active-high to facilitate the demultiplexing, cascading,
and
accomplished by using the Address inputs to select the desired device
output; one of the Chip Selects is used as a data input while the other
Chip Selects are held in their active states.
• TTL/NMOS Compatible Input Levels
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 4.5 to 5.5 V
• Low Input Current: 1.0 µA
The IN74HCT138A is identical in pinout to the LS/ALS138. The
The IN74HCT138A decodes a three-bit Address to one-of-eight
chip-selecting
LOGIC DIAGRAM
PIN 8 = GND
PIN 16 =V
functions.
CC
The
demultiplexing
H = high level (steady state)
L = low level (steady state)
X = don’t care
CS1 CS2 CS3
X X H
X H X
L X X
H L L
H L L
H L L
H L L
H L L
H L L
H L L
H L L
function
Inputs
is
FUNCTION TABLE
A2 A1 A0
X X X
X X X
X X X
H H H
L H H
H L H
H H L
L L H
L H L
H L L
L L L
T
A
ORDERING INFORMATION
= -55° to 125° C for all packages
PIN ASSIGNMENT
IN74HCT138AN Plastic
IN74HCT138AD SOIC
TECHNICAL DATA
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
IN74HCT138A
H H H H H H H H
H H H H H H H H
H H H H H H H H
L H H H H H H H
H L H H H H H H
H H L H H H H H
H H H L H H H H
H H H H L H H H
H H H H H L H H
H H H H H H L H
H H H H H H H L
Outputs
Rev. 00

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74hct138a Summary of contents

Page 1

... Decoder/Demultiplexer High-Performance Silicon-Gate CMOS The IN74HCT138A is identical in pinout to the LS/ALS138. The IN74HCT138A may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. The IN74HCT138A decodes a three-bit Address to one-of-eight active-lot outputs. This device features three Chip Select inputs, two ...

Page 2

... CC Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V outputs must be left open. Parameter and GND Pins CC SOIC Package+ Parameter and V should be constrained to the range GND≤(V IN OUT IN74HCT138A Value Unit -0.5 to +7 ± ...

Page 3

... ⎢I ⎢ ≤ 4.0 mA 4.5 OUT GND 5 GND 5 =0µA OUT V = 2.4 V, Any One Input GND, Other IN CC Inputs 5.5 I =0µA OUT IN74HCT138A Guaranteed Limit 25 °C ≤85 ≤125 Unit °C °C to -55°C 2.0 2.0 2.0 V 2.0 2.0 2.0 0.8 0.8 0.8 V 0.8 0.8 0.8 4.4 4.4 4.4 V 5.4 5.4 5.4 3.98 3.84 3.7 0.1 0.1 0 ...

Page 4

... f Figure 1. Switching Waveforms (V =5 =50pF,Input °C Parameter -55° Typical @25°C Figure 2. Switching Waveforms IN74HCT138A =t =6.0 ns Guaranteed Limit ≤85°C ≤125°C Unit =5 ...

Page 5

... Figure 3. Switching Waveforms EXPANDED LOGIC DIAGRAM IN74HCT138A Figure 4. Test Circuit Rev. 00 ...

Page 6

... Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B ‑ 0.25 mm (0.010) per side. N SUFFIX PLASTIC DIP (MS - 001BB SEATING -T- PLANE SUFFIX SOIC (MS - 012AC SEATING PLANE IN74HCT138A Dimension, mm Symbol MIN MAX A 18.67 19.69 B 6.1 7.11 5. 0.36 0.56 F 1.14 1.78 2. 7.62 J 0° 10° 2.92 3 ...

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