CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright © Harris Corporation 1994 1
SEMICONDUCTOR
CD54HC138/3A
CD54HCT138/3A
3-to-8-Line Decoder/Demultiplexer
Functional Diagram
15
14
13
12
10
7
9
11
1
3
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
6
2
4
5
A0
A1
A2
E1
E2
E3
Description
The CD54HC138/3A and CD54HCT138/3A are high-speed
silicon-gate CMOS decoders well suited to memory address
decoding or data routing application. Both circuits feature
low power consumption usually associated with CMOS cir-
cuitry, yet have speeds comparable to low-power Schottky
TTL logic. The circuits have three binary select inputs (A0,
A1, and A2). If the de vice is enabled, these inputs determine
which one of the eight normally high outputs will go low.
Tw o active low and one active high enab les (E1, E2, and E3)
are provided to ease the cascading of decoders. The
decoder’s outputs can drive 10 low-power Schottky TTL
equivalent loads.
HCT INPUT LOAD TABLE
INPUT UNIT LOAD (NOTE 1)
A0 - A2 1.5
E1, E2 1.25
E3 1
NOTE:
1. Unit load is ∆ICC limit specified in DC Electrical Specifications
Table, e.g., 360µA Max at +25oC.
June 1997
File Number 3779
Absolute Maximum Ratings
DC Supply Voltage, VCC
Voltages Referenced to GND . . . . . . . . . . . . . . . . . -0.5V to +7.0V
DC Input Voltage Range, All Inputs, VIN. . . . . . . -0.5V to VCC +0.5V
DC Output Voltage Range, All Outputs, VOUT . . -0.5V to VCC +0.5V
DC Input Diode Current, IIK
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, IOK
For VO < -0.5V or VO > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . .±20mA
DC Drain Current, Per Output, IO, For -0.5V < VO < VCC + 0.5V
Standard Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±25mA
Bus Driver Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±35mA
DC VCC or GND Current, ICC
Standard Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±50mA
Bus Driver Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±70mA
Power Dissipation Per Package, PD
TA = -55oC to +100oC (Package F) . . . . . . . . . . . . . . . . . . 500mW
TA = +100oC to +125oC (Package F) . . . . . . . . Derate Linearly at
8mW/oC to 300mW
Operating Temperature Range, TA
Package Type F. . . . . . . . . . . . . . . . . . . . . . . . . .-55oC to +125oC
Storage Temperature, TSTG . . . . . . . . . . . . . . . . . .-65oC to +150oC
Lead Temperature (During Soldering)
At Distance 1/16in. ± 1/32in. (1.59mm ± 0.79mm)
From Case For 10s Max . . . . . . . . . . . . . . . . . . . . . . . . . . +265oC
Unit Inserted Into a PC Board (Min Thickness 1/16in., 1.59mm)
With Solder Contacting Lead Tips Only. . . . . . . . . . . . . . . +300oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Recommended Operating Conditions
Supply Voltage Range, VCC
TA = Full Package Temperature Range
CD54HC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V
CD54HCT Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VIN, VOUT. . . . . . . . . . . . . . . 0V to VCC
Operating Temperature Range, TA . . . . . . . . . . . . .-55oC to +125oC
Input Rise and Fall Times, tR, tF
at 2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0ns to 1000ns
at 4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0ns to 500ns
at 6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0ns to 400ns
COMING SOON!
COMPLETE DATA SHEET
