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  ON Semiconductor Electronic Components Datasheet  

MC74HCT138A Datasheet

1-of-8 Decoder/ Demultiplexer

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MC74HCT138A pdf
MC74HCT138A
1-of-8 Decoder/
Demultiplexer with LSTTL
Compatible Inputs
High−Performance Silicon−Gate CMOS
The MC74HCT138A is identical in pinout to the LS138. The
HCT138A may be used as a level converter for interfacing TTL or
NMOS outputs to High Speed CMOS inputs.
The HCT138A decodes a three−bit Address to one−of−eight
active−lot outputs. This device features three Chip Select inputs, two
active−low and one active−high to facilitate the demultiplexing,
cascading, and chip−selecting functions. The demultiplexing function
is 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.
Features
Output Drive Capability: 10 LSTTL Loads
TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2 to 6 V
Low Input Current: 1.0 mA
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
Chip Complexity: 122 FETs or 30.5 Equivalent Gates
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
LOGIC DIAGRAM
ADDRESS
INPUTS
A0 1
A1 2
A2 3
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10
Y5
9 Y6
7
Y7
ACTIVE-LOW
OUTPUTS
CHIP-
CS1 6
SELECT CS2 4
INPUTS CS3 5
PIN 16 = VCC
PIN 8 = GND
www.onsemi.com
SOIC−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
PIN ASSIGNMENT
A0
A1
A2
CS2
CS3
CS1
Y7
GND
1
2
3
4
5
6
7
8
16 VCC
15 Y0
14 Y1
13 Y2
12 Y3
11 Y4
10 Y5
9 Y6
MARKING DIAGRAMS
16
HCT138AG
AWLYWW
1
SOIC−16
16
HCT
138A
ALYWG
G
1
TSSOP−16
A
WL, L
YY, Y
WW, W
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information on page 5 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
June, 2015 − Rev. 11
1
Publication Order Number:
MC74HCT138A/D


  ON Semiconductor Electronic Components Datasheet  

MC74HCT138A Datasheet

1-of-8 Decoder/ Demultiplexer

No Preview Available !

MC74HCT138A pdf
MC74HCT138A
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎDesign Criteria
Value Units
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎInternal Gate Count*
30.5 ea.
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎInternal Gate Propagation Delay
1.5 ns
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎInternal Gate Power Dissipation
5.0 mW
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎSpeed Power Product
.0075
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ*Equivalent to a two−input NAND gate.
pJ
FUNCTION TABLE
Inputs
Outputs
CS1CS2 CS3 A2 A1 A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H XXX HHHHHHH H
X H X XXX HHHHHHH H
L X X XXX HHHHHHH H
H L L LLL LHHHHHHH
H L L LLHH L HHHHHH
H L L LHL HH L HHHHH
H L L LHH H H H L H H H H
H L L HLL HHHH L HHH
H L L HLHHHHHH L HH
H L L HHL H H H H H H L H
H L L HHH H H H H H H H L
H = high level (steady state)
L = low level (steady state)
X = don’t care
MAXIMUM RATINGS
Symbol
Parameter
VCC DC Supply Voltage (Referenced to GND)
Vin DC Input Voltage (Referenced to GND)
Vout DC Output Voltage (Referenced to GND)
Iin DC Input Current, per Pin
Iout DC Output Current, per Pin
ICC DC Supply Current, VCC and GND Pins
PD Power Dissipation in Still Air
SOIC Package†
TSSOP Package†
Value
–0.5 to +7.0
–0.5 to VCC + 0.5
–0.5 to VCC + 0.5
±20
±25
±50
500
450
Unit
V
V
V
mA
mA
mA
mW
Tstg Storage Temperature
TL Lead Temperature, 1 mm from Case for 10 Seconds
(TSSOP or SOIC Package)
–65 to +150
260
_C
_C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of
these limits are exceeded, device functionality should not be assumed, damage may occur and
reliability may be affected.
†Derating: SOIC Package: –7 mW/_C from 65_ to 125_C
TSSOP Package: −6.1 mW/_C from 65_ to 125_C
This device contains protection
circuitry to guard against damage
due to high static voltages or electric
fields. However, precautions must
be taken to avoid applications of any
voltage higher than maximum rated
voltages to this high−impedance cir-
cuit. For proper operation, Vin and
Vout should be constrained to the
range GND v (Vin or Vout) v VCC.
Unused inputs must always be
tied to an appropriate logic voltage
level (e.g., either GND or VCC).
Unused outputs must be left open.
www.onsemi.com
2


Part Number MC74HCT138A
Description 1-of-8 Decoder/ Demultiplexer
Maker ON Semiconductor
Total Page 7 Pages
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