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CD74HC257 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. CD74HC257
Description  High Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD74HC257 Datasheet(HTML) 1 Page - Texas Instruments

   
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Data sheet acquired from Harris Semiconductor
SCHS171
Features
• Buffered Inputs
• Typical Propagation Delay ( In to Output ) = 12ns at
VCC = 5V, CL = 15pF, TA = 25
oC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
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 (OE) is active LOW. When OE is HIGH, all of
the outputs (1Y-4Y) are in the high impedance state regard-
less 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.
Pinout
CD74HC257, CD74HC257
(PDIP, SOIC)
TOP VIEW
Ordering Information
PART NUMBER
TEMP. RANGE
(oC)
PACKAGE
PKG.
NO.
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.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
S
1I0
1I1
1Y
2I0
2I1
GND
2Y
VCC
4I0
4I1
4Y
3I0
3I1
3Y
OE
November 1997
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
CD74HC257,
CD74HCT257
High Speed CMOS Logic Quad 2-Input
Multiplexer with Three-State Non-Inverting Outputs
File Number
1650.1
[ /Title
(CD74
HC257
,
CD74
HCT25
7)
/Sub-
ject
(High
Speed
CMOS
Logic
Quad
2-Input
Multi-
plexer


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