These devices contain two independent D-type positive-edge-triggered flip-flops.
A low level at the preset or clear inputs sets or resets the outputs regardless
of the levels of the other inputs. When preset and clear are inactive (high),
data at the D input meeting the setup time requirements are transferred to
the outputs on the positive-going edge of the clock pulse. Clock triggering
occurs at a voltage level and is not directly related to the rise time of
the clock pulse. Following the hold time interval, data at the D input may
be changed without affecting the levels at the outputs.
The SN54' family is characterized for operation over the full military
temperature range of -55°C to 125°C. The SN74' family is characterized
for operation from 0°C to 70°C.
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