The ’HC240 and ’HCT240 are inverting three-state buffers having two active-low output enables. The CD74HC241, ’HCT241, ’HC244 and ’HCT244 are non-inverting three-state buffers that differ only in that the 241 has one active-high and one active-low output enable, and the 244 has two active-low output enables. All three types have identical pinouts. PART NUM.
• HC/HCT240 Inverting
• HC/HCT241 Non-inverting
• HC/HCT244 Non-inverting
• Typical propagation delay = 8ns at VCC = 5 V,
CL = 15 pF, TA = 25℃ for HC240
• Three-state outputs
• Buffered inputs
• High-current bus driver outputs
• 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:
– 2 V to 6 V operation
– High noise immunity: NIL = 30%, NIH = 30% of
VCC at VCC = 5 V
• HCT types.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | CD54HCT240 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers | |
2 | CD54HCT243 |
Texas Instruments |
Quad-Bus Transceiver | |
3 | CD54HCT244 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers | |
4 | CD54HCT245 |
Texas Instruments |
High-Speed CMOS Logic Octal-Bus Transceiver | |
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 | CD54HCT251 |
Texas Instruments |
8-Input Multiplexer | |
10 | CD54HCT251F |
Texas Instruments |
8-Input Multiplexer | |
11 | CD54HCT257 |
Texas Instruments |
Quad 2-Input Multiplexer | |
12 | CD54HCT258 |
Texas Instruments |
QUADRUPLE 2-LINE TO 1-LINE SELECTORS/MULTIPLEXERS |