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74HC253 pdf datasheet
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大小:133 |
2008-08-06
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MM54HC253/MM74HC253
Dual 4-Channel TRI-STATEÉ Multiplexer
General Description
The MM54HC253/MM74HC253 utilizes advanced silicongate
CMOS technology to achieve the low power consumption
and high noise immunity of standard CMOS integrated
circuits, along with the capability to drive 10 LS-TTL loads.
The large output drive and TRI-STATE features of this device
make it ideally suited for interfacing with bus lines in
bus organized systems. When the output control input is
taken high, the multiplexer outputs are sent into a high impedance
state.
When the output control is held low, the associated multiplexer
chooses the correct output channel for the given input
signals determined by the select A and B inputs.
The 54HC/74HC logic family is functionally and pinout compatible
with the standard 54LS/74LS logic family. All inputs
are protected from damage due to static discharge by internal
diode clamps to VCC and ground.
Features
Y Typical propagation delay: 24 ns
Y Wide power supply range: 2V±6V
Y Low quiescent current: 80 mA maximum (74HC Series)
Y Low input current: 1 mA maximum
Y Fanout of 10 LS-TTL loads
Dual 4-Channel TRI-STATEÉ Multiplexer
General Description
The MM54HC253/MM74HC253 utilizes advanced silicongate
CMOS technology to achieve the low power consumption
and high noise immunity of standard CMOS integrated
circuits, along with the capability to drive 10 LS-TTL loads.
The large output drive and TRI-STATE features of this device
make it ideally suited for interfacing with bus lines in
bus organized systems. When the output control input is
taken high, the multiplexer outputs are sent into a high impedance
state.
When the output control is held low, the associated multiplexer
chooses the correct output channel for the given input
signals determined by the select A and B inputs.
The 54HC/74HC logic family is functionally and pinout compatible
with the standard 54LS/74LS logic family. All inputs
are protected from damage due to static discharge by internal
diode clamps to VCC and ground.
Features
Y Typical propagation delay: 24 ns
Y Wide power supply range: 2V±6V
Y Low quiescent current: 80 mA maximum (74HC Series)
Y Low input current: 1 mA maximum
Y Fanout of 10 LS-TTL loads
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