The ’HC251 and ’HCT251 are 8-channel digital multiplexers with three-state outputs, fabricated with high-speed silicongate CMOS technology. Together with the low power consumption of standard CMOS integrated circuits, they possess the ability to drive 10 LSTTL loads. The three-state feature makes them ideally suited for interfacing with bus lines in a busor.
• Selects one of eight binary data inputs
• Three-state output capability
• True and complement outputs
• Typical (data to output) propagation delay of 14 ns
at VCC = 5 V, CL = 15 pF, 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
• Alternate source is Philips
• HC types
– 2 V to 6 V operation
– High noise immunity : NIL = 30 %, NIH = 30% of
VCC at VCC = 5 V
• HCT t.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | CD74HC251 |
Texas Instruments |
8-Input Multiplexer | |
2 | CD74HC251M |
Texas Instruments |
8-Input Multiplexer | |
3 | CD74HC253 |
Texas Instruments |
Dual 4-Input Multiplexer | |
4 | CD74HC253E |
Texas Instruments |
Dual 4-Input Multiplexer | |
5 | CD74HC253M |
Texas Instruments |
Dual 4-Input Multiplexer | |
6 | CD74HC257 |
Texas Instruments |
Quad 2-Input Multiplexer | |
7 | CD74HC259 |
Texas Instruments |
8-Bit Addressable Latch | |
8 | CD74HC20 |
Texas Instruments |
Dual 4-Input NAND Gates | |
9 | CD74HC20E |
Texas Instruments |
Dual 4-Input NAND Gates | |
10 | CD74HC20M |
Texas Instruments |
Dual 4-Input NAND Gates | |
11 | CD74HC21 |
Texas Instruments |
High-Speed CMOS Logic Dual 4-Input AND Gate | |
12 | CD74HC221 |
Texas Instruments |
Dual Monostable Multivibrator |