CD74HC257M96

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 (overline)) is active LOW. When OC† (overline) 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.

Applications

• Transfers data from two register sets to four common output buses, with select inputs determining the source register
• Usable as a function generator

Key features

• Buffered Inputs
• Typical Propagation Delay ( In to Output ) = 12ns at Vcc = 5Vr, CL = 15pF, TA = 25℃
• Fanout (Over Temperature Range)
• Standard Outputs: 10 LSTTL Loads
• Bus Driver Outputs: 15 LSTTL Loads
• Wide Operating Temperature Range: -55℃ to 125℃
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
• 2V to 6V Operation
• High Noise Immunity: NLL = 30%, N1H = 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, |I| ≤ 1μA at VOL, VOH