CD74HC257系列介绍资料

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CD74HC257

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具有同向三态输出的高速 CMOS 逻辑四路双输入多路复用器

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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.

Buffered Inputs
Typical Propagation Delay (In to Output) = 12ns at V_CC = 5V, C_L = 15pF, T_A = 25°C
Fanout (Over Temperature Range)
- Standard Outputs...10 LSTTL Loads
- Bus Driver Outputs...15 LSTTL Loads
Wide Operating Temperature Range...–55°C to 125°C
Balanced Propagation Delay and Transition Times
Significant Power Reduction Compared to LSTTL Logic ICs
HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC at V_CC = 5V
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, V_IL = 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l 1µA at V_OL, V_OH

Data sheet acquired from Harris Semiconductor

Technology family	HC
Function	Digital Multiplexer
Configuration	2
Number of channels	4
Operating temperature range (°C)	-55 to 125
Rating	Catalog

PDIP (N)	16	181.42 mm² 19.3 x 9.4
SOIC (D)	16	59.4 mm² 9.9 x 6

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CD74HC257

具有同向三态输出的高速 CMOS 逻辑四路双输入多路复用器

4000-306-326