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technology to achieve operating speeds similar to LS-TTL
gates with the low power consumption of standard CMOS
integrated circuits. All gates have buffered outputs. All devices
have high noise immunity and the ability to drive 10
LS-TTL loads. The 54HC/74HC logic family is functionally
as well as pin-out 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.
As with standard 54HC/74HC push-pull outputs there are
diodes to both VCC and ground. Therefore the output should
not be pulled above VCC as it would be clamped to one
diode voltage above VCC. This diode is added to enhance
electrostatic protection.
gates with the low power consumption of standard CMOS
integrated circuits. All gates have buffered outputs. All devices
have high noise immunity and the ability to drive 10
LS-TTL loads. The 54HC/74HC logic family is functionally
as well as pin-out 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.
As with standard 54HC/74HC push-pull outputs there are
diodes to both VCC and ground. Therefore the output should
not be pulled above VCC as it would be clamped to one
diode voltage above VCC. This diode is added to enhance
electrostatic protection.
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