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Part Number 5962-8688401EA

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1
Data sheet acquired from Harris Semiconductor
SCHS147I
Features
· Select One Of Eight Data Outputs
Active Low for 138, Active High for 238
· l/O Port or Memory Selector
· Three Enable Inputs to Simplify Cascading
· Typical Propagation Delay of 13 ns at V
CC
= 5 V,
C
L
= 15 pF, T
A
= 25
o
C
· Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
· Wide Operating Temperature Range . . . -55
o
C to 125
o
C
· Balanced Propagation Delay and Transition Times
· Significant Power Reduction Compared to LSTTL
Logic ICs
· HC Types
- 2 V to 6 V Operation
- High Noise Immunity: N
IL
= 30%, N
IH
= 30% of V
CC
at V
CC
= 5 V
· HCT Types
- 4.5-V to 5.5-V Operation
- Direct LSTTL Input Logic Compatibility,
V
IL
= 0.8 V (Max), V
IH
= 2 V (Min)
- CMOS Input Compatibility, I
l
1
µ
A at V
OL
, V
OH
Description
The 'HC138, 'HC238, 'HCT138, and 'HCT238 are high-speed
silicon-gate CMOS decoders well suited to memory address
decoding or data-routing applications. Both circuits feature
low power consumption usually associated with CMOS
circuitry, yet have speeds comparable to low-power Schottky
TTL logic. 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
HC/HCT138 series go low or which of the normally low
outputs of the HC/HCT238 series go high.
Two active low and one active high enables (E1, E2, and E3)
are provided to ease the cascading of decoders. The
decoder's eight outputs can drive ten low-power Schottky
TTL equivalent loads.
Ordering Information
PART NUMBER
TEMP. RANGE
(
o
C)
PACKAGE
CD54HC138F3A
-55 to 125
16 Ld CERDIP
CD54HC238F3A
-55 to 125
16 Ld CERDIP
CD54HCT138F3A
-55 to 125
16 Ld CERDIP
CD54HCT238F3A
-55 to 125
16 Ld CERDIP
CD74HC138E
-55 to 125
16 Ld PDIP
CD74HC138M
-55 to 125
16 Ld SOIC
CD74HC138MT
-55 to 125
16 Ld SOIC
CD74HC138M96
-55 to 125
16 Ld SOIC
CD74HC238E
-55 to 125
16 Ld PDIP
CD74HC238M
-55 to 125
16 Ld SOIC
CD74HC238MT
-55 to 125
16 Ld SOIC
CD74HC238M96
-55 to 125
16 Ld SOIC
CD74HC238NSR
-55 to 125
16 Ld SOP
CD74HC238PW
-55 to 125
16 Ld TSSOP
CD74HC238PWR
-55 to 125
16 Ld TSSOP
CD74HC238PWT
-55 to 125
16 Ld TSSOP
CD74HCT138E
-55 to 125
16 Ld PDIP
CD74HCT138M
-55 to 125
16 Ld SOIC
CD74HCT138MT
-55 to 125
16 Ld SOIC
CD74HCT138M96
-55 to 125
16 Ld SOIC
CD74HCT238E
-55 to 125
16 Ld PDIP
CD74HCT238M
-55 to 125
16 Ld SOIC
CD74HCT238M96
-55 to 125
16 Ld SOIC
NOTE: When ordering, use the entire part number. The suffixes 96
and R denote tape and reel. The suffix T denotes a small-quantity
reel of 250.
October 1997 - Revised August 2004
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
©
2004, Texas Instruments Incorporated
CD54/74HC138, CD54/74HCT138,
CD54/74HC238, CD54/74HCT238
High-Speed CMOS Logic 3- to 8-Line Decoder/
Demultiplexer Inverting and Noninverting
[ /Title
(CD74
HC138
,
CD74
HCT13
8,
CD74
HC238
,
CD74
HCT23
8)
/Sub-
ject
(High
Speed
2
Pinout
CD54HC138, CD54HCT138, CD54HC238, CD54HCT238
(CERDIP)
CD74HC138, CD74HCT138, CD74HCT238
(PDIP, SOIC)
CD74HC238
(PDIP, SOIC, SOP, TSSOP)
TOP VIEW
Signal names in parentheses are for 'HC138 and 'HCT138.
Functional Diagram
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
A0
A1
A2
E1
E2
E3
GND
(Y7) Y7
V
CC
Y1 (Y1)
Y2 (Y2)
Y3 (Y3)
Y4 (Y4)
Y5 (Y5)
Y6 (Y6)
Y0 (Y0)
15
14
13
12
10
7
9
11
1
2
3
5
6
4
E3
E2
E1
A2
A1
A0
Y0
Y7
Y6
Y5
Y4
Y3
Y2
Y1
Y0
Y7
Y6
Y5
Y4
Y3
Y2
Y1
HC/HCT
238
HC/HCT
138
TRUTH TABLE 'HC138, 'HCT138
INPUTS
OUTPUTS
ENABLE
ADDRESS
E3
E2
E1
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
H
X
X
X
H
H
H
H
H
H
H
H
L
X
X
X
X
X
H
H
H
H
H
H
H
H
X
H
X
X
X
X
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
L
H
H
H
H
H
H
H
L
L
L
H
L
H
H
L
H
H
H
H
H
H
L
L
L
H
H
H
H
H
L
H
H
H
H
H
L
L
H
L
L
H
H
H
H
L
H
H
H
H
L
L
H
L
H
H
H
H
H
H
L
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
H
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H = High Voltage Level, L = Low Voltage Level, X = Don't Care
TRUTH TABLE 'HC238, 'HCT238
INPUTS
OUTPUTS
ENABLE
ADDRESS
E3
E2
E1
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
H
X
X
X
L
L
L
L
L
L
L
L
L
X
X
X
X
X
L
L
L
L
L
L
L
L
X
H
X
X
X
X
L
L
L
L
L
L
L
L
H
L
L
L
L
L
H
L
L
L
L
L
L
L
H
L
L
L
L
H
L
H
L
L
L
L
L
L
H
L
L
L
H
L
L
L
H
L
L
L
L
L
H
L
L
L
H
H
L
L
L
H
L
L
L
L
H
L
L
H
L
L
L
L
L
L
H
L
L
L
H
L
L
H
L
H
L
L
L
L
L
H
L
L
H
L
L
H
H
L
L
L
L
L
L
L
H
L
H
L
L
H
H
H
L
L
L
L
L
L
L
H
H = High Voltage Level, L = Low Voltage Level, X = Don't Care
CD54/74HC138, CD54/74HCT138, CD54/74HC238, CD54/74HCT238
3
Absolute Maximum Ratings
Thermal Information
DC Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
DC Input Diode Current, I
IK
For V
I
< -0.5V or V
I
> V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . . . .±
20mA
DC Output Diode Current, I
OK
For V
O
< -0.5V or V
O
> V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . .±
20mA
DC Output Source or Sink Current per Output Pin, I
O
For V
O
> -0.5V or V
O
< V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . .±
25mA
DC V
CC
or Ground Current, I
CC or
I
GND
. . . . . . . . . . . . . . . . . .±
50mA
Operating Conditions
Temperature Range (T
A
) . . . . . . . . . . . . . . . . . . . . . -55
o
C to 125
o
C
Supply Voltage Range, V
CC
HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V
HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, V
I
, V
O
. . . . . . . . . . . . . . . . . 0V to V
CC
Input Rise and Fall Time
2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max)
4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max)
6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (Max)
Package Thermal Impedance,
JA
(see Note 1):
E (PDIP) Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
o
C/W
M (SOIC) Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
o
C/W
NS (SOP) Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
o
C/W
PW (TSSOP) Package . . . . . . . . . . . . . . . . . . . . . . . . . 108
o
C/W
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . .-65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300
o
C
(SOIC - Lead Tips Only)
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.
NOTE:
1. The package thermal impedance is calculated in accordance with JESD 51-7.
DC Electrical Specifications
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO 85
o
C -55
o
C TO 125
o
C
UNITS
V
I
(V)
I
O
(mA)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
HC TYPES
High Level Input
Voltage
V
IH
-
-
2
1.5
-
-
1.5
-
1.5
-
V
4.5
3.15
-
-
3.15
-
3.15
-
V
6
4.2
-
-
4.2
-
4.2
-
V
Low Level Input
Voltage
V
IL
-
-
2
-
-
0.5
-
0.5
-
0.5
V
4.5
-
-
1.35
-
1.35
-
1.35
V
6
-
-
1.8
-
1.8
-
1.8
V
High Level Output
Voltage
CMOS Loads
V
OH
V
IH
or V
IL
-0.02
2
1.9
-
-
1.9
-
1.9
-
V
-0.02
4.5
4.4
-
-
4.4
-
4.4
-
V
-0.02
6
5.9
-
-
5.9
-
5.9
-
V
High Level Output
Voltage
TTL Loads
-
-
-
-
-
-
-
-
-
V
-4
4.5
3.98
-
-
3.84
-
3.7
-
V
-5.2
6
5.48
-
-
5.34
-
5.2
-
V
Low Level Output
Voltage
CMOS Loads
V
OL
V
IH
or V
IL
0.02
2
-
-
0.1
-
0.1
-
0.1
V
0.02
4.5
-
-
0.1
-
0.1
-
0.1
V
0.02
6
-
-
0.1
-
0.1
-
0.1
V
Low Level Output
Voltage
TTL Loads
-
-
-
-
-
-
-
-
-
V
4
4.5
-
-
0.26
-
0.33
-
0.4
V
5.2
6
-
-
0.26
-
0.33
-
0.4
V
Input Leakage
Current
I
I
V
CC
or
GND
-
6
-
-
±
0.1
-
±
1
-
±
1
µ
A
Quiescent Device
Current
I
CC
V
CC
or
GND
0
6
-
-
8
-
80
-
160
µ
A
CD54/74HC138, CD54/74HCT138, CD54/74HC238, CD54/74HCT238
4
HCT TYPES
High Level Input
Voltage
V
IH
-
-
4.5 to
5.5
2
-
-
2
-
2
-
V
Low Level Input
Voltage
V
IL
-
-
4.5 to
5.5
-
-
0.8
-
0.8
-
0.8
V
High Level Output
Voltage
CMOS Loads
V
OH
V
IH
or V
IL
-0.02
4.5
4.4
-
-
4.4
-
4.4
-
V
High Level Output
Voltage
TTL Loads
-4
4.5
3.98
-
-
3.84
-
3.7
-
V
Low Level Output
Voltage
CMOS Loads
V
OL
V
IH
or V
IL
0.02
4.5
-
-
0.1
-
0.1
-
0.1
V
Low Level Output
Voltage
TTL Loads
4
4.5
-
-
0.26
-
0.33
-
0.4
V
Input Leakage
Current
I
I
V
CC
and
GND
0
5.5
-
±
0.1
-
±
1
-
±
1
µ
A
Quiescent Device
Current
I
CC
V
CC
or
GND
0
5.5
-
-
8
-
80
-
160
µ
A
Additional Quiescent
Device Current Per
Input Pin: 1 Unit Load
I
CC
(Note 2)
V
CC
-2.1
-
4.5 to
5.5
-
100
360
-
450
-
490
µ
A
NOTE:
2. For dual-supply systems, theoretical worst case (V
I
= 2.4V, V
CC
= 5.5V) specification is 1.8mA.
DC Electrical Specifications
(Continued)
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO 85
o
C -55
o
C TO 125
o
C
UNITS
V
I
(V)
I
O
(mA)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
HCT Input Loading Table
INPUT
UNIT LOADS
A0-A2
1.5
E1, E2
1.25
E3
1
NOTE: Unit Load is
I
CC
limit specified in DC Electrical Table, e.g.,
360
µ
A max at 25
o
C.
Switching Specifications
Input t
r
, t
f
= 6ns
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO
85
o
C
-55
o
C TO 125
o
C
UNITS
MIN
TYP
MAX
MIN
MAX
MIN
MAX
HC TYPES
Propagation Delay
t
PLH,
t
PHL
C
L
= 50pF
2
-
-
150
-
190
-
225
ns
Address to Output
4.5
-
-
30
-
38
-
45
ns
C
L
= 15pF
5
-
13
-
-
-
-
-
ns
C
L
= 50pF
6
-
-
26
-
33
-
38
ns
CD54/74HC138, CD54/74HCT138, CD54/74HC238, CD54/74HCT238
5
Enable to Output
HC/HCT138
t
PLH,
t
PHL
C
L
= 50pF
2
-
-
150
-
190
-
265
ns
4.5
-
-
30
-
38
-
53
ns
6
-
-
26
-
33
-
45
ns
Output Transition Time
(Figure 1)
t
TLH
, t
THL
C
L
= 50pF
2
-
-
75
-
95
-
110
ns
4.5
-
-
15
-
19
-
22
ns
6
-
-
13
-
16
-
19
ns
Power Dissipation
Capacitance (Notes 3, 4)
C
PD
C
L
= 15pF
5
-
67
-
-
-
-
-
pF
Input Capacitance
C
IN
-
-
-
-
10
-
10
-
10
pF
HCT TYPES
Propagation Delay
Address to Output
t
PLH
, t
PHL
C
L
= 50pF
4.5
-
-
35
-
44
-
53
ns
C
L
= 15pF
5
-
14
-
-
-
-
-
ns
Enable to Output
HC/HCT138
t
PLH
, t
PHL
C
L
= 50pF
4.5
-
-
35
-
44
-
53
ns
Enable to Output
HC/HCT238
t
PLH,
t
PHL
C
L
= 15pF
4.5
-
-
40
-
50
-
60
ns
Output Transition Time
(Figure 2)
t
TLH
, t
THL
C
L
= 50pF
4.5
-
-
15
-
19
-
22
ns
Power Dissipation
Capacitance (Notes 3, 4)
C
PD
C
L
= 15pF
5
-
67
-
-
-
-
-
pF
Input Capacitance
C
IN
-
-
-
-
10
-
10
-
10
pF
NOTES:
3. C
PD
is used to determine the dynamic power consumption, per gate.
4. P
D
= V
CC
2
f
i
(C
PD
+ C
L
) where f
i
= Input Frequency, C
L
= Output Load Capacitance, V
CC
= Supply Voltage.
Switching Specifications
Input t
r
, t
f
= 6ns (Continued)
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO
85
o
C
-55
o
C TO 125
o
C
UNITS
MIN
TYP
MAX
MIN
MAX
MIN
MAX
Test Circuits and Waveforms
FIGURE 7. HC AND HCU TRANSITION TIMES AND PROPAGA-
TION DELAY TIMES, COMBINATION LOGIC
FIGURE 8. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
t
PHL
t
PLH
t
THL
t
TLH
90%
50%
10%
50%
10%
INVERTING
OUTPUT
INPUT
GND
V
CC
t
r
= 6ns
t
f
= 6ns
90%
t
PHL
t
PLH
t
THL
t
TLH
2.7V
1.3V
0.3V
1.3V
10%
INVERTING
OUTPUT
INPUT
GND
3V
t
r
= 6ns
t
f
= 6ns
90%
CD54/74HC138, CD54/74HCT138, CD54/74HC238, CD54/74HCT238