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HD74HCT242

Hitachi Semiconductor
Part Number HD74HCT242
Manufacturer Hitachi Semiconductor
Description Quad. Bus Transceivers (with 3-state outputs)
Published Mar 23, 2005
Detailed Description HD74HCT242/HD74HCT243 Quad. Bus Transceivers (with 3-state outputs) Description The HD74HCT242 is an inverting buffer a...
Datasheet PDF File HD74HCT242 PDF File

HD74HCT242
HD74HCT242


Overview
HD74HCT242/HD74HCT243 Quad.
Bus Transceivers (with 3-state outputs) Description The HD74HCT242 is an inverting buffer and the HD74HCT243 is a noninverting buffer.
Each device has one active high enable (GBA), and one active low enable (GAB).
GBA enables the A outputs and GAB enables the B outputs.
The device does not have schmitt trigger inputs.
Features • • • • • • LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility High Speed Operation: tpd (A to Y) = 9.
5 ns typ (C L = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 4.
5 to 5.
5 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table HD74HCT242 Control Inputs GAB H L H L I O O Z : : : : GBA H H L L Input Output Inverting Output High Impedance Data Port Status A O Z Z I B I Z Z O HD74HCT243 Data Port Status A O Z Z I B I Z Z O HD74HCT242/HD74HCT243 Pin Arrangement GAB NC 1A 2A 3A 4A GND 1 2 3 4 5 6 7 14 VCC 13 GBA 12 NC 11 1B 10 2B 9 8 3B 4B (Top view) Block Diagram HD74HCT242 VCC A 1 of 4 Transceivers VCC B GBA GAB 2 HD74HCT242/HD74HCT243 HD74HCT243 VCC A 1 of 4 Transceivers VCC B GBA GAB Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage DC current drain per pin DC current drain per VCC, GND DC input diode current DC output diode current Power dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating –0.
5 to +7.
0 –0.
5 to VCC + 0.
5 –0.
5 to VCC + 0.
5 ±35 ±75 ±20 ±20 500 –65 to +150 Unit V V V mA mA mA mA mW °C 3 HD74HCT242/HD74HCT243 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH VIL Output voltage VOH Ta = –40 to +85°C Max — 0.
8 — — 0.
1 0.
33 ±5.
0 ±1.
0 40 µA µA µA V Unit V V V Test Conditions VCC (V) 4.
5 to 5.
5 4.
5 to 5.
5 4.
5 4.
5 4.
5 4.
5 5.
5 5.
5 5.
5 Vin = VIH or VIL I OH = –20 µA I OH = –6 mA Vin = VIH or VIL I OL = 20 µA I OL = 6 mA Vin = VIH or VIL, Vout = VCC or GND Vin = VCC or GND Vin = VCC...


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