TI CD74ACT238E

CD74AC138, CD74ACT138,
CD74AC238, CD74ACT238
Data sheet acquired from Harris Semiconductor
SCHS234
3-to-8-Line Decoders/Demultiplexers
September 1998
Features
Description
• CD74AC138, CD74ACT138 . . . . . . . . . . . . . . . Inverting
The CD74AC138, CD74ACT138, CD74AC238, and
CD74ACT238 are 3-to-8-line decoders/demultiplexers that
utilize the Harris Advanced CMOS Logic technology. Both
circuits have three binary select inputs (A0, A1, and A2). If
the device is enabled, these inputs determine which one of
the eight normally HIGH outputs of the AC/ACT138 will go
LOW or which on of the normally LOW outputs of the
AC/ACT238 will go HIGH. Two active LOW and one active
HIGH enables (E1, E2 and E3) are provided to simplify the
cascading of these devices.
• CD74AC238, CD74ACT238 . . . . . . . . . . . Non-Inverting
• Buffered Inputs
• Typical Propagation Delay
- 5ns at VCC = 5V, TA = 25oC, CL = 50pF
[ /Title
(CD74
AC138
,
CD74
ACT13
8,
CD74
AC238
,
CD74
ACT23
8)
/Subject (3to-8Line
Decoders/De
multiplexers)
/Autho
r ()
/Keywords
(Harris
Semiconductor,
Advan
ced
• Exceeds 2kV ESD Protection MIL-STD-883, Method
3015
• SCR-Latchup-Resistant CMOS Process and Circuit
Design
Ordering Information
• Speed of Bipolar FAST™/AS/S with Significantly
Reduced Power Consumption
PART
NUMBER
TEMP.
RANGE (oC)
PACKAGE
PKG.
NO.
• Balanced Propagation Delays
CD74AC138E
0 to 70oC, -40 to 85, 16 Ld PDIP
-55 to 125
E16.3
• AC Types Feature 1.5V to 5.5V Operation and
Balanced Noise Immunity at 30% of the Supply
CD74ACT138E
0 to 70oC, -40 to 85, 16 Ld PDIP
-55 to 125
E16.3
CD74AC238E
0 to 70oC, -40 to 85, 16 Ld PDIP
-55 to 125
E16.3
CD74ACT238E
0 to 70oC, -40 to 85, 16 Ld PDIP
-55 to 125
E16.3
CD74AC138M
0 to 70oC, -40 to 85, 16 Ld SOIC
-55 to 125
M16.15
CD74ACT138M
0 to 70oC, -40 to 85, 16 Ld SOIC
-55 to 125
M16.15
CD74AC238M
0 to 70oC, -40 to 85, 16 Ld SOIC
-55 to 125
M16.15
CD74ACT238M
0 to 70oC, -40 to 85, 16 Ld SOIC
-55 to 125
M16.15
• ±24mA Output Drive Current
- Fanout to 15 FAST™ ICs
- Drives 50Ω Transmission Lines
Pinout
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
(PDIP, SOIC)
TOP VIEW
A0 1
A1 2
A2 3
E1 4
E2 5
E3 6
AC/ACT138 Y7
7
AC/ACT238 Y7
GND 8
16 VCC
Y0 AC/ACT138
15 Y0 AC/ACT238
14 Y1 AC/ACT138
Y1 AC/ACT238
13 Y2 AC/ACT138
Y2 AC/ACT238
12 Y3 AC/ACT138
Y3 AC/ACT238
11 Y4 AC/ACT138
Y4 AC/ACT238
10 Y5 AC/ACT138
Y5 AC/ACT238
9 Y6 AC/ACT138
Y6 AC/ACT238
NOTES:
17. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
18. Wafer and die for this part number is available which meets all electrical specifications. Please contact your local sales office or Harris
customer service for ordering information.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
FAST™ is a Trademark of Fairchild Semiconductor.
Copyright © Harris Corporation 1998
1
File Number
1909.1
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
Functional Diagram
AC/ACT AC/ACT
238
138
A0
1
15
2
14
3
13
A1
A2
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
12
4
11
5
10
6
9
E1
E2
E3
7
CD74AC/ACT138 TRUTH TABLE
INPUTS
ENABLE
ADDRESS
OUTPUTS
E3
(NOTE 4)
E0
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
H
X
X
X
H
H
H
H
H
H
H
H
L
X
X
X
X
H
H
H
H
H
H
H
H
H
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
H
H
L
H
H
H
H
H
H
H
L
L
H
L
H
H
L
H
H
H
H
H
H
L
L
H
H
H
H
H
L
H
H
H
H
H
L
H
L
L
H
H
H
H
L
H
H
H
H
L
H
L
L
H
H
H
H
H
L
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
H
L
CD74AC/ACT238 TRUTH TABLE
INPUTS
ENABLE
ADDRESS
OUTPUTS
E3
(NOTE 4)
E0
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
H
X
X
X
L
L
L
L
L
L
L
L
L
X
X
X
X
L
L
L
L
L
L
L
L
H
L
L
L
L
H
L
L
L
L
L
L
L
H
L
L
L
H
L
H
L
L
L
L
L
L
H
L
L
H
L
L
L
H
L
L
L
L
L
H
L
L
H
H
L
L
L
H
L
L
L
L
H
L
H
L
L
L
L
L
L
H
L
L
L
H
L
H
L
H
L
L
L
L
L
H
L
L
H
L
H
H
L
L
L
L
L
L
L
H
L
H
L
H
H
H
L
L
L
L
L
L
L
H
NOTES:
19. H = High Level, L = Low Level, X = Don’t Care
20. E0 = E1 + E2
2
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
Absolute Maximum Ratings
Thermal Information
DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V
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 . . . . . . . . . . . . . . . . . . . .±50mA
DC Output Source or Sink Current per Output Pin, IO
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA
DC VCC or Ground Current, ICC or IGND (Note 5) . . . . . . . . .±100mA
Thermal Resistance (Typical, Note 7)
θJA (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
90
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
160
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC
Operating Conditions
Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Supply Voltage Range, VCC (Note 6)
AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC
Input Rise and Fall Slew Rate, dt/dv
AC Types, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . . 50ns (Max)
AC Types, 3.6V to 5.5V . . . . . . . . . . . . . . . . . . . . . . . . 20ns (Max)
ACT Types, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . 10ns (Max)
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.
NOTES:
21. For up to 4 outputs per device, add ±25mA for each additional output.
22. Unless otherwise specified, all voltages are referenced to ground.
23. θJA is measured with the component mounted on an evaluation PC board in free air.
DC Electrical Specifications
TEST
CONDITIONS
PARAMETER
-40oC TO
85oC
25oC
-55oC TO
125oC
SYMBOL
VI (V)
IO (mA)
VCC
(V)
MIN
MAX
MIN
MAX
MIN
MAX
UNITS
VIH
-
-
1.5
1.2
-
1.2
-
1.2
-
V
AC TYPES
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
VIL
VOH
-
VIH or VIL
3
2.1
-
2.1
-
2.1
-
V
5.5
3.85
-
3.85
-
3.85
-
V
1.5
-
0.3
-
0.3
-
0.3
V
3
-
0.9
-
0.9
-
0.9
V
5.5
-
1.65
-
1.65
-
1.65
V
-0.05
1.5
1.4
-
1.4
-
1.4
-
V
-0.05
3
2.9
-
2.9
-
2.9
-
V
-0.05
4.5
4.4
-
4.4
-
4.4
-
V
-4
3
2.58
-
2.48
-
2.4
-
V
-24
4.5
3.94
-
3.8
-
3.7
-
V
-75
(Note 8, 9)
5.5
-
-
3.85
-
-
-
V
-50
(Note 8, 9)
5.5
-
-
-
-
3.85
-
V
-
3
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
DC Electrical Specifications
(Continued)
TEST
CONDITIONS
PARAMETER
Low Level Output Voltage
-40oC TO
85oC
25oC
-55oC TO
125oC
SYMBOL
VI (V)
IO (mA)
VCC
(V)
MIN
MAX
MIN
MAX
MIN
MAX
UNITS
VOL
VIH or VIL
0.05
1.5
-
0.1
-
0.1
-
0.1
V
0.05
3
-
0.1
-
0.1
-
0.1
V
0.05
4.5
-
0.1
-
0.1
-
0.1
V
12
3
-
0.36
-
0.44
-
0.5
V
24
4.5
-
0.36
-
0.44
-
0.5
V
75
(Note 8, 9)
5.5
-
-
-
1.65
-
-
V
50
(Note 8, 9)
5.5
-
-
-
-
-
1.65
V
II
VCC or
GND
-
5.5
-
±0.1
-
±1
-
±1
µA
ICC
VCC or
GND
0
5.5
-
8
-
80
-
160
µA
High Level Input Voltage
VIH
-
-
4.5 to
5.5
2
-
2
-
2
-
V
Low Level Input Voltage
VIL
-
-
4.5 to
5.5
-
0.8
-
0.8
-
0.8
V
High Level Output Voltage
VOH
VIH or VIL
-0.05
4.5
4.4
-
4.4
-
4.4
-
V
-24
4.5
3.94
-
3.8
-
3.7
-
V
-75
(Note 8, 9)
5.5
-
-
3.85
-
-
-
V
-50
(Note 8, 9)
5.5
-
-
-
-
3.85
-
V
Input Leakage Current
Quiescent Supply Current
MSI
ACT TYPES
Low Level Output Voltage
Input Leakage Current
Quiescent Supply Current
MSI
Additional Supply Current per
Input Pin TTL Inputs High
1 Unit Load
VOL
VIH or VIL
0.05
4.5
-
0.1
-
0.1
-
0.1
V
24
4.5
-
0.36
-
0.44
-
0.5
V
75
(Note 8, 9)
5.5
-
-
-
1.65
-
-
V
50
(Note 8, 9)
5.5
-
-
-
-
-
1.65
V
II
VCC or
GND
-
5.5
-
±0.1
-
±1
-
±1
µA
ICC
VCC or
GND
0
5.5
-
8
-
80
-
160
µA
∆ICC
VCC
-2.1
-
4.5 to
5.5
-
2.4
-
2.8
-
3
mA
NOTES:
24. Test one output at a time for a 1-second maximum duration. Measurement is made by forcing current and measuring voltage to minimize
power dissipation.
25. Test verifies a minimum 50Ω transmission-line-drive capability at 85oC, 75Ω at 125oC.
ACT Input Load Table
INPUT
UNIT LOAD
A0-A2
0.83
E1, E2
1
E3
0.42
NOTE: Unit load is ∆ICC limit specified in DC Electrical Specifications
Table, e.g., 2.4mA max at 25oC.
4
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
Switching Specifications Input tr, tf = 3ns, CL = 50pF (Worst Case)
-40oC TO 85oC
-55oC TO 125oC
SYMBOL
VCC (V)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
tPLH, tPHL
1.5
-
-
125
-
-
138
ns
3.3
(Note 11)
4
-
14
3.9
-
15.4
ns
5
(Note 12)
2.8
-
10
2.8
-
11
ns
1.5
-
-
114
-
-
125
ns
3.3
3.6
-
12.7
3.5
-
14
ns
5
2.6
-
9.1
2.5
-
10
ns
1.5
-
-
125
-
-
138
ns
3.3
4
-
14
3.9
-
15.4
ns
5
2.8
-
10
2.8
-
11
ns
1.5
-
-
170
-
-
187
ns
3.3
5.4
-
19.1
5.3
-
21
ns
5
3.9
-
13.6
3.8
-
15
ns
1.5
-
-
135
-
-
149
ns
3.3
4.3
-
15.2
4.2
-
16.7
ns
5
3.1
-
10.7
3
-
11.9
ns
1.5
-
-
189
-
-
208
ns
3.3
6
-
21.1
5.8
-
23.2
ns
5
4.3
-
15.1
4.2
-
16.6
ns
CI
-
-
-
10
-
-
10
pF
CPD
(Note 13)
-
-
110
-
-
110
-
pF
Propagation Delay,
An to Output
(CD74AC/ACT138)
tPLH, tPHL
5
(Note 12)
3.1
-
10.9
3
-
12
ns
Propagation Delay,
E1, E2 to Output
(CD74AC/ACT138)
tPLH, tPHL
5
2.7
-
9.5
2.6
-
10.5
ns
Propagation Delay,
E3 to Output
(CD74AC/ACT138)
tPLH, tPHL
5
2.8
-
10
2.8
-
11
ns
Propagation Delay,
An to Output
(CD74AC/ACT238)
tPLH, tPHL
5
4
-
14.2
3.9
-
15.6
ns
Propagation Delay,
E1, E2 to Output
(CD74AC/ACT238)
tPLH, tPHL
5
3.7
-
12.9
3.6
-
14.2
ns
PARAMETER
AC TYPES
Propagation Delay,
An to Output
(CD74AC/ACT138)
Propagation Delay,
E1, E2 to Output
(CD74AC/ACT138)
Propagation Delay,
E3 to Output
(CD74AC/ACT138)
Propagation Delay,
An to Output
(CD74AC/ACT238)
Propagation Delay,
E1, E2 to Output
(CD74AC/ACT238)
Propagation Delay,
E3 to Output
(CD74AC/ACT238)
Input Capacitance
Power Dissipation Capacitance
tPLH, tPHL
tPLH, tPHL
tPLH, tPHL
tPLH, tPHL
tPLH, tPHL
ACT TYPES
5
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
Switching Specifications Input tr, tf = 3ns, CL = 50pF (Worst Case)
(Continued)
-40oC TO 85oC
PARAMETER
-55oC TO 125oC
SYMBOL
VCC (V)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Propagation Delay,
E3 to Output
(CD74AC/ACT238)
tPLH, tPHL
5
3.5
-
12.4
3.4
-
13.6
ns
Input Capacitance
CI
-
-
-
10
-
-
10
pF
CPD
(Note 13)
-
-
110
-
-
110
-
pF
Power Dissipation Capacitance
NOTES:
26. Limits tested at 100%.
27. 3.3V Min at 3.6V, Max at 3V.
28. 5V Min at 5.5V, Max at 4.5V.
29. CPD is used to determine the dynamic power consumption per package.
AC: PD = VCC2 fi (CPD + CL)
ACT: PD = VCC2 fi (CPD + CL) + VCC ∆ICC where fi = input frequency, CL = output load capacitance, VCC = supply voltage.
tf = 3ns
tr = 3ns
tr = 3ns
90%
VS
INPUT
10%
tf = 3ns
E1, E2
90%
VS
GND
INPUT
GND
E3
138 OUTPUT
138 OUTPUT
VS
VS
tPHL
tPLH
tPHL
tPLH
VS
VS
238 OUTPUT
tPLH
238 OUTPUT
tPLH
tPHL
tPHL
FIGURE 8. PROPAGATION DELAY TIMES
FIGURE 9. PROPAGATION DELAY TIMES
OUTPUT
RL (NOTE)
500Ω
DUT
OUTPUT
LOAD
CL
50pF
NOTE: For AC Series Only: When VCC = 1.5V, RL = 1kΩ.
CD74AC
CD74ACT
VCC
3V
Input Switching Voltage, VS
0.5 VCC
1.5V
Output Switching Voltage, VS
0.5 VCC
0.5 VCC
Input Level
FIGURE 10. PROPAGATION DELAY TIMES
6
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