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.
• 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,.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | CD54HCT251 |
Texas Instruments |
8-Input Multiplexer | |
2 | CD54HCT251F |
Texas Instruments |
8-Input Multiplexer | |
3 | CD54HCT258 |
Texas Instruments |
QUADRUPLE 2-LINE TO 1-LINE SELECTORS/MULTIPLEXERS | |
4 | CD54HCT259 |
Texas Instruments |
8-Bit Addressable Latch | |
5 | CD54HCT20 |
Texas Instruments |
Dual 4-Input NAND Gates | |
6 | CD54HCT20F |
Texas Instruments |
Dual 4-Input NAND Gates | |
7 | CD54HCT238 |
Texas Instruments |
High-Speed CMOS Logic 3 to 8-Line Decoder/Demultiplexer Inverting/Noninverting | |
8 | CD54HCT238F |
Texas Instruments |
High-Speed CMOS Logic 3 to 8-Line Decoder/Demultiplexer Inverting/Noninverting | |
9 | CD54HCT240 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers | |
10 | CD54HCT241 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers | |
11 | CD54HCT243 |
Texas Instruments |
Quad-Bus Transceiver | |
12 | CD54HCT244 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers |