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74HC242 pdf datasheet
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2008-08-06
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MM54HC242/MM74HC242
Inverting Quad TRI-STATEÉ Transceiver
MM54HC243/MM74HC243 Quad TRI-STATE Transceiver
General Description
These TRI-STATE bidirectional inverting and non-inverting
buffers utilize advanced silicon-gate CMOS technology and
are intended for two-way asynchronous communication between
data buses. They have high drive current outputs
which enable high speed operation when driving large bus
capacitances. These circuits possess the low power dissipation
and high noise immunity associated with CMOS circuits,
but speeds comparable to low power Schottky TTL
circuits. They can also drive 15 LS-TTL loads.
The MM54HC243/MM74HC243 is a non-inverting buffer
and the MM54HC242/MM74HC242 is an inverting 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. This device does not have
Schmitt trigger inputs.
All inputs are protected from damage due to static discharge
by diodes to VCC and ground.
Features
Y Typical propagation delay: 12 ns
Y TRI-STATE outputs
Y Two way asynchronous communication
Y High output current: 6 mA (74HC)
Y Wide power supply range: 2±6V
Y Low quiescent supply current: 80 mA (74HC)
Inverting Quad TRI-STATEÉ Transceiver
MM54HC243/MM74HC243 Quad TRI-STATE Transceiver
General Description
These TRI-STATE bidirectional inverting and non-inverting
buffers utilize advanced silicon-gate CMOS technology and
are intended for two-way asynchronous communication between
data buses. They have high drive current outputs
which enable high speed operation when driving large bus
capacitances. These circuits possess the low power dissipation
and high noise immunity associated with CMOS circuits,
but speeds comparable to low power Schottky TTL
circuits. They can also drive 15 LS-TTL loads.
The MM54HC243/MM74HC243 is a non-inverting buffer
and the MM54HC242/MM74HC242 is an inverting 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. This device does not have
Schmitt trigger inputs.
All inputs are protected from damage due to static discharge
by diodes to VCC and ground.
Features
Y Typical propagation delay: 12 ns
Y TRI-STATE outputs
Y Two way asynchronous communication
Y High output current: 6 mA (74HC)
Y Wide power supply range: 2±6V
Y Low quiescent supply current: 80 mA (74HC)
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