2023/10/19 15:06:06
149
Features
? Buffered Inputs
? Typical Propagation Delay ( In to Output ) = 12ns at VCC = 5V, CL = 15pF, TA = 25oC
? 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 ’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 outputs (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.
热门型号
热门资讯
20万现货SKU
品类不断扩充
科技智能大仓储
4小时快速交货
仅从原厂和代理商进货
每一颗料均可原厂追溯
明码标价节省时间成本
一站式采购正品元器件
工商网监