These devices contain two independent J-K negative-edge-triggered flip-flops.
A low level at the preset and 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 J and K inputs meeting the setup time requirements are transferred
to the outputs on the negative-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 J and K inputs
may be changed without affecting the levels at the outputs. These versatile
flip-flops can perform as toggle flip-flops by tying J and K high.
The SN54LS112A and SN54S112 are characterized for operation over the full
military temperature range of -55°C to 125°C. The SN74LS112A and SN74S112A
are characterized for operation from 0°C to 70°C.
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