CD54/74AC257, CD54/74ACT257, CD74ACT258
Data sheet acquired from Harris Semiconductor SCHS248A
August 1998 - Revised Ma...
CD54/74AC257, CD54/74ACT257, CD74ACT258
Data sheet acquired from Harris Semiconductor SCHS248A
August 1998 - Revised May 2000
Quad 2-Input Multiplexer with Three-State Outputs
Features
Description
’AC257, ’ACT257. . . . . . . . . . . . . Non-Inverting Outputs
CD74ACT258 . . . . . . . . . . . . . . . . . . . Inverting Outputs
Buffered Inputs
Typical Propagation Delay - 4.4ns at VCC = 5V, TA = 25oC, CL = 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
The ’AC257, ’ACT257 and CD74ACT258 are quad 2-input multiplexers with three-state outputs that utilize 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 highimpedance 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 ’AC257, ’ACT257, and CD74ACT258. The state of the Select input determines the particular register from which the data comes. The ’AC257, ’ACT257 and CD74ACT258 can also be used as function generators.
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 Transmi...