器件名称:
CD54AC257
功能描述:
Quad 2-Input Multiplexer with Three-State Outputs
文件大小:
455.33KB 共17页
简 介:
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 Description 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. Features ’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 Signicantly 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 50 Transmission Lines Order……
