CD54HCT257 Datasheet, PDF (1/12 Pages) Texas Instruments – High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs

Data sheet acquired from Harris Semiconductor
SCHS171D
November 1997 - Revised October 2003
CD54HC257, CD74HC257,
CD54HCT257, CD74HCT257
High-Speed CMOS Logic Quad 2-Input
Multiplexer with Three-State Non-Inverting Outputs
[ /Title
(CD74
HC257
,
CD74
HCT25
7)
/Sub-
ject
(High
Speed
CMOS
Logic
Quad
2-Input
Multi-
plexer
Features
• Buffered Inputs
• Typical Propagation Delay ( In to Output ) = 12ns at
V_CC = 5V, C_L = 15pF, T_A = 25^oC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC
at V_CC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V_IL= 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l ≤ 1µA at V_OL, V_OH
Description
The ’HC257 and ’HCT257 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 out-
puts (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 buses 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
PART NUMBER
TEMP. RANGE
(^oC)
PACKAGE
CD54HC257F3A
-55 to 125
16 Ld CERDIP
CD54HCT257F3A
-55 to 125
16 Ld CERDIP
CD74HC257E
-55 to 125
16 Ld PDIP
CD74HC257M
-55 to 125
16 Ld SOIC
CD74HC257MT
-55 to 125
16 Ld SOIC
CD74HC257M96
-55 to 125
16 Ld SOIC
CD74HCT257E
-55 to 125
16 Ld PDIP
CD74HCT257M
-55 to 125
16 Ld SOIC
CD74HCT257MT
-55 to 125
16 Ld SOIC
CD74HCT257M96
-55 to 125
16 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel. The suffix T denotes a small-quantity reel of
250.
Pinout
CD54HC257, CD54HCT257
(CERDIP)
CD74HC257, CD74HCT257
(PDIP, SOIC)
TOP VIEW
S1
1I₀ 2
1I₁ 3
1Y 4
2I₀ 5
2I₁ 6
2Y 7
GND 8
16 V_CC
15 OE
14 4I₀
13 4I₁
12 4Y
11 3I₀
10 3I₁
9 3Y
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
1