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

Number of channels 2
Technology family LS
Supply voltage (min) (V) 4.5
Supply voltage (max) (V) 5.5
Input type Bipolar
Output type Push-Pull
Clock frequency (max) (MHz) 25
IOL (max) (mA) 8
IOH (max) (mA) -0.4
Supply current (max) (µA) 8000
Features High speed (tpd 10-50ns)
Operating temperature range (°C) -55 to 125
Rating Military