Texas Instruments CD74ACT257M, CD74ACT257E, CD74ACT258M96, CD74ACT258M, CD74ACT257SM Datasheet
...
Data sheet acquired from Harris Semiconductor
SCHS248
August 1998
CD74A C257, CD74ACT257,
CD74A CT258
Quad 2-Input Multiplexer
with Three-State Outputs
Features
• CD74AC257, CD74ACT257 . . . . Non-Inverting Outputs
• CD74ACT258 . . . . . . . . . . . . . . . . . . . Inverting Outputs
• Buffered Inputs
• Typical Propagation Delay
- 4.4ns at V
= 5V, TA = 25oC, CL = 50pF
CC
• 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
Pinout
CD74AC257, CD74ACT257, CD74ACT258
(PDIP, SOIC)
TOP VIEW
AC/ACT257ACT258 ACT258AC/ACT257
V
1I
1I
1Y
2I
2I
2Y
GND
S
0
1
0
1
1I
1I
1Y
2I
2I
2Y
GND
1
S
2
0
3
1
4
5
0
6
1
7
8
16
CC
15
OE
14
4I
0
13
4I
1
12
4Y
3I
11
0
10
3I
1
9
3Y
V
OE
4I
4I
4Y
3I
3I
3Y
CC
0
1
0
1
Description
The CD74AC257, CD74ACT257 and CD74ACT258 are
quad 2-input multiplexers with three-state outputs that utilize
the Harris 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 CD74AC257,
CD74ACT257 and CD74ACT258. The state of the Select
input determines the particular register from which the data
comes. The CD74AC257, CD74ACT257 and CD74ACT258
can also be used as function generators.
Ordering Information
PART
NUMBER
CD74AC257E 0 to 70oC, -40 to 85,
CD74ACT257E 0 to 70oC, -40 to 85,
CD74ACT258E 0 to 70oC, -40 to 85,
CD74AC257M 0 to 70oC, -40 to 85,
CD74ACT257M 0 to 70oC, -40 to 85,
CD74ACT258M 0 to 70oC, -40 to 85,
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Waf erand 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.
TEMP.
RANGE (oC) PACKAGE
16 Ld PDIP E16.3
-55 to 125
16 Ld PDIP E16.3
-55 to 125
16 Ld PDIP E16.3
-55 to 125
16 Ld SOIC M16.15
-55 to 125
16 Ld SOIC M16.15
-55 to 125
16 Ld SOIC M16.15
-55 to 125
PKG.
NO.
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 1955.1
Functional Diagram
OUTPUT
ENABLE
OE S I
HXXXZZ
LLLXLH
LLHXHL
LHXLLH
LHXHHL
H = High level voltage, L = Low level voltage, Z = High impedance (off) state, X = Don’t Care
CD74AC257, CD74ACT257, CD74ACT258
AC/ACT
AC/ACT
257
258
2
1I
0
5
2I
0
11
3I
0
14
4I
0
3
1I
1
6
2I
1
10
3I
1
13
4I
1
S
OE
115
TRUTH TABLE
SELECT
INPUT DATA INPUTS
0
4
1Y
1Y
7
2Y
2Y
9
3Y
3Y
12
4Y
4Y
257
OUTPUTS
I
1
Y Y
258
OUTPUTS
2
CD74AC257, CD74ACT257, CD74ACT258
Absolute Maximum Ratings Thermal Information
DC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V
DC Input Diode Current, I
IK
For VI < -0.5V or VI > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, I
OK
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA
DC Output Source or Sink Current per Output Pin, I
O
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA
DC VCC or Ground Current, I
CC orIGND
(Note 3) . . . . . . . . .±100mA
Operating Conditions
Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Supply Voltage Range, VCC (Note 4)
AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to V
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. θJA is measured with the component mounted on an evaluation PC board in free air.
Thermal Resistance (Typical, Note 5) θJA (oC/W)
PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ___
SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ___
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC
CC
DC Electrical Specifications
PARAMETER SYMBOL
AC TYPES
High Level Input Voltage V
Low Level Input Voltage V
High Level Output Voltage V
IH
IL
OH
TEST
CONDITIONS
(V) IO(mA) MIN MAX MIN MAX MIN MAX
I
V
CC
(V)
25
o
C
-40oC TO
85oC
-55oC TO
125oC
- - 1.5 1.2 - 1.2 - 1.2 - V
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
VIH or V
-0.05 1.5 1.4 - 1.4 - 1.4 - V
IL
-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
5.5 - - 3.85 - - - V
(Note 6, 7)
-50
5.5----3.85 - V
(Note 6, 7)
UNITSV
3
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