Both circuits have three binary select inputs (A0, A1 and A2) that can be latched by an active High Latch Enable (LE) signal to isolate the outputs from select-input changes. A “Low” LE makes the output transparent to the input and the circuit functions as a one-of-eight decoder. Two Output Enable inputs (OE1 and OE0) are provided to simplify cascading and .
• Select One of Eight Data Outputs - Active Low for CD74HC137 and CD74HCT137 - Active High for ’HC237 and CD74HCT237
• l/O Port or Memory Selector
• Two Enable Inputs to Simplify Cascading
•
Typical Propagation Delay of 13ns 15pF, TA = 25oC (CD74HC237)
at
VCC
=
5V,
• 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 .
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | CD74HC238 |
Texas Instruments |
High-Speed CMOS Logic 3 to 8-Line Decoder/Demultiplexer Inverting/Noninverting | |
2 | CD74HC238NS |
Texas Instruments |
High-Speed CMOS Logic 3 to 8-Line Decoder/Demultiplexer Inverting/Noninverting | |
3 | CD74HC238PW |
Texas Instruments |
High-Speed CMOS Logic 3 to 8-Line Decoder/Demultiplexer Inverting/Noninverting | |
4 | CD74HC20 |
Texas Instruments |
Dual 4-Input NAND Gates | |
5 | CD74HC20E |
Texas Instruments |
Dual 4-Input NAND Gates | |
6 | CD74HC20M |
Texas Instruments |
Dual 4-Input NAND Gates | |
7 | CD74HC21 |
Texas Instruments |
High-Speed CMOS Logic Dual 4-Input AND Gate | |
8 | CD74HC221 |
Texas Instruments |
Dual Monostable Multivibrator | |
9 | CD74HC22106 |
Intersil Corporation |
QMOS 8 x 8 x 1 Crosspoint Switches with Memory Control | |
10 | CD74HC240 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers | |
11 | CD74HC241 |
Texas Instruments |
High-Speed CMOS Logic Octal Buffer/Line Drivers | |
12 | CD74HC243 |
Texas Instruments |
Quad-Bus Transceiver |