The HD74HC242 is an inverting buffer and the HD74HC243 is a noninverting buffer. Each device has one active high enable (GBA), and one active low enable ( GAB). GBA enables the A output and GAB enables the B outputs. The device does not have schmitt trigger inputs. Features • • • • • High Speed Operation: tpd = 10 ns typ (CL = 50 pF) High Output Current: Fa.
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• High Speed Operation: tpd = 10 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
HD74HC242 Control inputs GAB H L H L I O O Z : : : : GBA H H L L Input Output Inverting Output Hight Impedance Data Port Status A O Z Z I B I Z Z O HC74HC243 Data Port Status A O Z Z I B I Z Z O
HD74HC242/HD74HC243
Pin Arrangement
HD74HC242
GAB NC 1A 2A 3A 4A GND
1 2 3 4 5 6 7
14 13 12 11 10 9 8
VCC GBA NC 1B 2B 3B 4B
(Top view)
HD74HC.
No. | Partie # | Fabricant | Description | Fiche Technique |
---|---|---|---|---|
1 | HD74HC240 |
Hitachi Semiconductor |
Octal Buffers/Line Drivers/Line Receivers(with inverted 3-state outputs) | |
2 | HD74HC240 |
Renesas |
Octal Buffers/Line Drivers/Line Receivers | |
3 | HD74HC241 |
Hitachi Semiconductor |
Octal Buffers/Line Drivers/Line Receivers(with noninverted 3-state outputs) | |
4 | HD74HC241 |
Renesas |
Octal Buffers/Line Drivers/Line Receivers | |
5 | HD74HC242 |
Hitachi Semiconductor |
Quad. Bus Transceivers (with 3-state outputs)/Quad. Bus Transceivers (with noninverted 3-state outputs) | |
6 | HD74HC244 |
Hitachi Semiconductor |
Octal Buffers/Line Drivers/Line Receivers(with noninverted 3-state outputs) | |
7 | HD74HC244 |
Renesas |
Octal Buffers/Line Drivers/Line Receivers | |
8 | HD74HC245 |
Hitachi Semiconductor |
Octal Bus Transceivers (with 3-state outputs) | |
9 | HD74HC245 |
Renesas |
Octal Bus Transceivers | |
10 | HD74HC20 |
Hitachi Semiconductor |
Dual 4-input NAND Gates | |
11 | HD74HC20 |
Renesas |
Dual 4-input NAND Gates | |
12 | HD74HC21 |
Hitachi Semiconductor |
Dual 4-input AND Gates |