CD74AC257 Datasheet, PDF (1/8 Pages) Texas Instruments – Quad 2-Input Multiplexer with Three-State Outputs

Data sheet acquired from Harris Semiconductor
SCHS248
August 1998
CD74AC257, CD74ACT257,
CD74ACT258
Quad 2-Input Multiplexer
with Three-State Outputs
Features
Description
• CD74AC257, CD74ACT257 . . . . Non-Inverting Outputs
• CD74ACT258 . . . . . . . . . . . . . . . . . . . Inverting Outputs
• Buffered Inputs
• Typical Propagation Delay
- 4.4ns at V_CC = 5V, T_A = 25^oC, 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
Pinout
CD74AC257, CD74ACT257, CD74ACT258
(PDIP, SOIC)
TOP VIEW
ACT258
S
1I₀
1I₁
1Y
2I₀
2I₁
2Y
GND
AC/ACT257
S1
1I₀ 2
1I₁ 3
1Y 4
2I₀ 5
2I₁ 6
2Y 7
GND 8
AC/ACT257
16 V_CC
15 OE
ACT258
V_CC
OE
14 4I₀
4I₀
13 4I₁
4I₁
12 4Y
4Y
11 3I₀
3I₀
10 3I₁
3I₁
9 3Y
3Y
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
CD74ACT257E
CD74ACT258E
CD74AC257M
CD74ACT257M
CD74ACT258M
TEMP.
RANGE (^oC)
PACKAGE
0 to 70^oC, -40 to 85, 16 Ld PDIP
-55 to 125
0 to 70^oC, -40 to 85, 16 Ld PDIP
-55 to 125
0 to 70^oC, -40 to 85, 16 Ld PDIP
-55 to 125
0 to 70^oC, -40 to 85, 16 Ld SOIC
-55 to 125
0 to 70^oC, -40 to 85, 16 Ld SOIC
-55 to 125
0 to 70^oC, -40 to 85, 16 Ld SOIC
-55 to 125
PKG.
NO.
E16.3
E16.3
E16.3
M16.15
M16.15
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 and die for this part number is available which meets all elec-
trical specifications. Please contact your local sales office or Harris
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 © Harris Corporation 1998
1
File Number 1955.1