CD54/74AC257, CD54/74ACT257,
CD74ACT258
Data sheet acquired from Harris Semiconductor
SCHS248A
August 1998 - Revised May 2000
Quad 2-Input Multiplexer
with Three-State Outputs
Description
The ’AC257, ’ACT257 and CD74ACT258 are quad 2-input
multiplexers with three-state outputs that utilize Advanced
CMOS Logic technology. Each of these devices selects four
bits of data from two sources under the control of a common
Select input (S). The Output Enable (OE) is active LOW.
When OE is HIGH, all of the outputs (Y or Y) are in the high-
impedance state regardless of all other input conditions.
Moving data from two groups of registers to four common
output buses is a common use of the ’AC257, ’ACT257, and
CD74ACT258. The state of the Select input determines the
particular register from which the data comes. The ’AC257,
’ACT257 and CD74ACT258 can also be used as function
generators.
Features
• ’AC257, ’ACT257. . . . . . . . . . . . . Non-Inverting Outputs
• CD74ACT258 . . . . . . . . . . . . . . . . . . . Inverting Outputs
• Buffered Inputs
• Typical Propagation Delay
- 4.4ns at V
CC
= 5V, T
A
= 25
o
C, C
L
= 50pF
• Exceeds 2kV ESD Protection MIL-STD-883, Method
3015
• SCR-Latchup-Resistant CMOS Process and Circuit
Design
• Speed of Bipolar FAST™/AS/S with Significantly
Reduced Power Consumption
• Balanced Propagation Delays
• AC Types Feature 1.5V to 5.5V Operation and
Balanced Noise Immunity at 30% of the Supply
•
±24mA
Output Drive Current
- Fanout to 15 FAST™ ICs
Drives 50Ω Transmission Lines
Ordering Information
PART
NUMBER
CD54AC257F3A
CD74AC257E
CD74AC257M
TEMP.
RANGE (
o
C)
-55 to 125
PACKAGE
16 Ld CERDIP
0 to 70
o
C, -40 to 85, 16 Ld PDIP
-55 to 125
0 to 70
o
C, -40 to 85, 16 Ld SOIC
-55 to 125
-55 to 125
16 Ld CERDIP
0 to 70
o
C, -40 to 85, 16 Ld PDIP
-55 to 125
0 to 70
o
C, -40 to 85, 16 Ld SOIC
-55 to 125
0 to 70
o
C, -40 to 85, 16 Ld PDIP
-55 to 125
0 to 70
o
C, -40 to 85, 16 Ld SOIC
-55 to 125
Pinout
CD54AC257, CD54ACT257
(CERDIP)
CD74AC257, CD74ACT257, CD74ACT258
(PDIP, SOIC)
TOP VIEW
ACT258
S
1I
0
1I
1
1Y
2I
0
2I
1
2Y
GND
AC/ACT257
S 1
1I
0
2
1I
1
3
1Y 4
2I
0
5
2I
1
6
2Y 7
GND 8
AC/ACT257
16 V
CC
15 OE
14 4I
0
13 4I
1
12 4Y
11 3I
0
10 3I
1
9 3Y
ACT258
V
CC
OE
4I
0
4I
1
4Y
3I
0
3I
1
3Y
CD54ACT257F3A
CD74ACT257E
CD74ACT257M
CD74ACT258E
CD74ACT258M
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all
electrical specifications. Please contact your local TI sales office or
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
©
2000, Texas Instruments Incorporated
1
CD54/74AC257, CD54/74ACT257, CD74ACT258
Functional Diagram
AC/ACT AC/ACT
257
258
1I
0
2I
0
3I
0
4I
0
1I
1
2I
1
3I
1
4I
1
S
OE
2
4
5
11
7
14
3
9
6
10
12
13
1
15
4Y
4Y
3Y
3Y
2Y
2Y
1Y
1Y
TRUTH TABLE
OUTPUT
ENABLE
OE
H
L
L
L
L
SELECT
INPUT
S
X
L
L
H
H
DATA INPUTS
I
0
X
L
H
X
X
I
1
X
X
X
L
H
257
OUTPUTS
Y
Z
L
H
L
H
258
OUTPUTS
Y
Z
H
L
H
L
H = High level voltage, L = Low level voltage, Z = High impedance (off) state, X = Don’t Care
2
CD54/74AC257, CD54/74ACT257, CD74ACT258
Absolute Maximum Ratings
DC Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V
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
. . . . . . . . . . . . . . . . . . . .±50mA
DC Output Source or Sink Current per Output Pin, I
O
For V
O
> -0.5V or V
O
< V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . .±50mA
DC V
CC
or Ground Current, I
CC or
I
GND
(Note 3)
. . . . . . . . .±100mA
Thermal Information
Thermal Resistance (Typical, Note 5)
θ
JA
(
o
C/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
___
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
___
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . .-65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300
o
C
Operating Conditions
Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . -55
o
C to 125
o
C
Supply Voltage Range, V
CC
(Note 4)
AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, V
I
, V
O
. . . . . . . . . . . . . . . . . 0V to V
CC
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:
3. For up to 4 outputs per device, add
±25mA
for each additional output.
4. Unless otherwise specified, all voltages are referenced to ground.
5.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
DC Electrical Specifications
TEST
CONDITIONS
PARAMETER
AC TYPES
High Level Input Voltage
V
IH
-
-
1.5
3
5.5
Low Level Input Voltage
V
IL
-
-
1.5
3
5.5
High Level Output Voltage
V
OH
V
IH
or V
IL
-0.05
-0.05
-0.05
-4
-24
-75
(Note 6, 7)
-50
(Note 6, 7)
1.5
3
4.5
3
4.5
5.5
5.5
1.2
2.1
3.85
-
-
-
1.4
2.9
4.4
2.58
3.94
-
-
-
-
-
0.3
0.9
1.65
-
-
-
-
-
-
-
1.2
2.1
3.85
-
-
-
1.4
2.9
4.4
2.48
3.8
3.85
-
-
-
-
0.3
0.9
1.65
-
-
-
-
-
-
-
1.2
2.1
3.85
-
-
-
1.4
2.9
4.4
2.4
3.7
-
3.85
-
-
-
0.3
0.9
1.65
-
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
SYMBOL
V
I
(V)
I
O
(mA)
V
CC
(V)
25
o
C
MIN
MAX
-40
o
C TO
85
o
C
MIN
MAX
-55
o
C TO
125
o
C
MIN
MAX
UNITS
3
CD54/74AC257, CD54/74ACT257, CD74ACT258
DC Electrical Specifications
(Continued)
TEST
CONDITIONS
PARAMETER
Low Level Output Voltage
SYMBOL
V
OL
V
I
(V)
V
IH
or V
IL
I
O
(mA)
0.05
0.05
0.05
12
24
75
(Note 6, 7)
50
(Note 6, 7)
Input Leakage Current
Three-State Leakage
Current
Quiescent Supply Current
MSI
ACT TYPES
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
V
IH
V
IL
V
OH
-
-
V
IH
or V
IL
-
-
-0.05
-24
-75
(Note 6, 7)
-50
(Note 6, 7)
Low Level Output Voltage
V
OL
V
IH
or V
IL
0.05
24
75
(Note 6, 7)
50
(Note 6, 7)
Input Leakage Current
Three-State or Leakage
Current
Quiescent Supply Current
MSI
Additional Supply Current per
Input Pin TTL Inputs High
1 Unit Load
NOTES:
6. 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.
7. Test verifies a minimum 50Ω transmission-line-drive capability at 85
o
C, 75Ω at 125
o
C.
I
I
I
OZ
V
CC
or
GND
V
IH
or V
IL
V
O
= V
CC
or GND
V
CC
or
GND
V
CC
-2.1
-
-
4.5 to
5.5
4.5 to
5.5
4.5
4.5
5.5
5.5
4.5
4.5
5.5
5.5
5.5
5.5
2
-
4.4
3.94
-
-
-
-
-
-
-
-
-
0.8
-
-
-
-
0.1
0.36
-
-
±0.1
±0.5
2
-
4.4
3.8
3.85
-
-
-
-
-
-
-
-
0.8
-
-
-
-
0.1
0.44
1.65
-
±1
±5
2
-
4.4
3.7
-
3.85
-
-
-
-
-
-
-
0.8
-
-
-
-
0.1
0.5
-
1.65
±1
±10
V
V
V
V
V
V
V
V
V
V
µA
µA
I
I
I
OZ
V
CC
or
GND
V
IH
or V
IL
V
O
= V
CC
or GND
V
CC
or
GND
-
-
25
o
C
MIN
-
-
-
-
-
-
-
-
-
MAX
0.1
0.1
0.1
0.36
0.36
-
-
±0.1
±0.5
-40
o
C TO
85
o
C
MIN
-
-
-
-
-
-
-
-
-
MAX
0.1
0.1
0.1
0.44
0.44
1.65
-
±1
±5
-55
o
C TO
125
o
C
MIN
-
-
-
-
-
-
-
-
-
MAX
0.1
0.1
0.1
0.5
0.5
-
1.65
±1
±10
UNITS
V
V
V
V
V
V
V
µA
µA
V
CC
(V)
1.5
3
4.5
3
4.5
5.5
5.5
5.5
5.5
I
CC
0
5.5
-
8
-
80
-
160
µA
I
CC
∆I
CC
0
-
5.5
4.5 to
5.5
-
-
8
2.4
-
-
80
2.8
-
-
160
3
µA
mA
4
CD54/74AC257, CD54/74ACT257, CD74ACT258
ACT Input Load Table
INPUT
Data
S
OE
UNIT LOAD
0.83
1.27
1.27
NOTE: Unit load is
∆I
CC
limit specified in DC Electrical Specifications
Table, e.g., 2.4mA max at 25
o
C.
Switching Specifications
Input t
r
, t
f
= 3ns, C
L
= 50pF (Worst Case)
-40
o
C TO 85
o
C
PARAMETER
AC TYPES
Propagation Delay,
In to Y
AC/ACT257
t
PLH
, t
PHL
1.5
3.3
(Note 9)
5
(Note 10)
Propagation Delay,
S to Y
AC/ACT257
t
PLH
, t
PHL
1.5
3.3
5
Propagation Delay,
OE to Y
AC/ACT257
t
PLZ
, t
PHZ
,
t
PZL
, t
PZH
1.5
3.3
5
Propagation Delay,
In to Y
’AC/CD74ACT258
t
PLH
, t
PHL
1.5
3.3
5
Propagation Delay,
S to Y
’AC/CD74ACT258
t
PLH
, t
PHL
1.5
3.3
5
Propagation Delay,
OE to Y
’AC/CD74ACT258
t
PLZ
, t
PHZ
,
t
PZL
, t
PZH
1.5
3.3
5
Three-State Output
Capacitance
Input Capacitance
Power Dissipation Capacitance
ACT TYPES
Propagation Delay,
In to Y
AC/ACT257
Propagation Delay,
S to Y
AC/ACT257
t
PLH
, t
PHL
5
(Note 10)
5
2.8
-
9.7
2.7
-
10.7
ns
C
O
C
I
C
PD
(Note 11)
-
-
-
-
3.3
2.4
-
4.8
3.5
-
5.3
3.8
-
2.9
2.1
-
4.8
3.5
-
5.3
3.8
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
130
106
11.8
8.5
153
17.1
12.2
167
18.7
13.4
91
10.2
7.3
153
17.1
12.2
167
18.7
13.4
15
10
-
-
3.3
2.3
-
4.7
3.4
-
5.2
3.7
-
2.8
2
-
4.7
3.4
-
5.2
3.7
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
130
117
13
9.3
168
18.8
13.4
184
20.6
14.7
100
11.2
8
168
18.8
13.4
184
20.6
14.7
15
10
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
pF
SYMBOL
V
CC
(V)
MIN
TYP
MAX
-55
o
C TO 125
o
C
MIN
TYP
MAX
UNITS
t
PLH
, t
PHL
4
-
14
3.9
-
15.4
ns
5
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