Texas Instruments CD74HCT257M96, CD74HCT257M, CD74HCT257E, CD74HC257M, CD74HC257E Datasheet
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CD74HC257,
/
j
[ /Title
(CD74
HC257
,
CD74
HCT25
7)
Subect
(High
Speed
CMOS
Logic
Quad
2-Input
Multiplexer
Data sheet acquired from Harris Semiconductor
SCHS171
November 1997
Multiplexer with Three-State Non-In verting Outputs
Features
• Buffered Inputs
• Typical Propagation Delay ( In to Output ) = 12ns at
V
= 5V, CL = 15pF, TA = 25oC
CC
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
o
• Wide Operating Temperature Range . . . -55
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
= 0.8V (Max), VIH = 2V (Min)
IL
- CMOS Input Compatibility, I
= 30%, NIH = 30% of V
IL
≤ 1µA at VOL, V
l
C to 125oC
OH
CD74HCT257
High Speed CMOS Logic Quad 2-Input
Description
The Harris CD74HC257 and CD74HCT257 are quad 2-input
multiplexers which select four bits of data from two sources
under the control of a common Select Input (S). The Output
Enable input (
the outputs (1Y-4Y) are in the high impedance state regardless of all other input conditions.
Moving data from two groups of registers to four common
output busses is a common use of the 257. The state of the
Select input determines the particular register from which
the data comes. It can also be used as a function generator.
Ordering Information
CC
PART NUMBER
CD74HC257E -55 to 125 16 Ld PDIP E16.3
CD74HCT257E -55 to 125 16 Ld PDIP E16.3
CD74HC257M -55 to 125 16 Ld SOIC M16.15
CD74HCT257M -55 to 125 16 Ld SOIC M16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer or 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.
OE) is active LOW. When OE is HIGH, all of
TEMP. RANGE
(oC) PACKAGE
PKG.
NO.
Pinout
CD74HC257, CD74HC257
(PDIP, SOIC)
TOP VIEW
V
1
S
2
1I
0
3
1I
1
4
1Y
5
2I
0
6
2I
1
2Y
7
8
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
1
16
CC
15
OE
14
4I
0
13
4I
1
12
4Y
3I
11
0
10
3I
1
9
3Y
File Number 1650.1
Functional Diagram
15
OE
1
S
13
4I
1
14
4I
0
CD74HC257, CD74HCT257
P
N
12
4Y
3I
1
3I
0
2I
1
2I
0
1I
1
1I
0
10
11
6
5
3
2
3 CIRCUITS IDENTICAL TO CIRCUIT
IN ABOVE DASHED ENCLOSURE
TRUTH TABLE
OUTPUT
ENABLE
OE S I
SELECT
INPUT DATA INPUTS OUTPUT
0
I
1
Y
HXXXZ
LLLXL
LLHXH
LHXLL
9
7
4
3Y
2Y
1Y
LHXHH
NOTE:
H = High Voltage Level
L = Low Voltage Level
X = Don’t Care
Z = High Impedance, OFF State
2
CD74HC257, CD74HCT257
Absolute Maximum Ratings Thermal Information
DC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
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 . . . . . . . . . . . . . . . . . . . .±20mA
DC Drain Current, per Output, I
O
For -0.5V < VO < VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . . . . . .±35mA
DC Output Source or Sink Current per Output Pin, I
O
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA
DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .±70mA
Operating Conditions
Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Supply Voltage Range, V
HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V
HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to V
Input Rise and Fall Time
2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max)
4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max)
6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (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.
NOTE:
3. θJA is measured with the component mounted on an evaluation PC board in free air.
CC
Thermal Resistance (Typical, Note 3) θJA (oC/W)
PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . .300oC
(SOIC - Lead Tips Only)
CC
DC Electrical Specifications
PARAMETER SYMBOL
HC TYPES
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
CMOS Loads
High Level Output
Voltage
TTL Loads
Low Level Output
Voltage
CMOS Loads
Low Level Output
Voltage
TTL Loads
Input Leakage
Current
V
IH
V
IL
V
OH
V
OL
I
I
TEST
CONDITIONS
25oC -40oC TO 85oC -55oC TO 125oC
VCC (V)
- - 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
- - 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
VIH or
V
-0.02 2 1.9 - - 1.9 - 1.9 - V
IL
-0.02 4.5 4.4 - - 4.4 - 4.4 - V
-0.02 6 5.9 - - 5.9 - 5.9 - V
-6 4.5 3.98 - - 3.84 - 3.7 - V
-7.8 6 5.48 - - 5.34 - 5.2 - V
VIH or
V
0.02 2 - - 0.1 - 0.1 - 0.1 V
IL
0.02 4.5 - - 0.1 - 0.1 - 0.1 V
0.02 6 - - 0.1 - 0.1 - 0.1 V
6 4.5 - - 0.26 - 0.33 - 0.4 V
7.8 6 - - 0.26 - 0.33 - 0.4 V
VCC or
-6--±0.1 - ±1-±1 µA
GND
UNITSVI(V) IO(mA) MIN TYP MAX MIN MAX MIN MAX
3
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