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Package Options Include Plastic “Small

Outline’ Packages, Ceramic Chip Carriers

and Flat Packages, and Plastic and Ceramic

DIPs

Dependable Texas Instruments Quality and

Reliability

description

These devices contain two independent J-K 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 in-

active (high), data at the J and K inputs 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 ar 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 grounding K and tying J high. They also can perform

23 D-type flip-flops if J and K are tied together.

The SN54109 and SNSALS109A are characterized for

operation over the full military temperature range of

—55°C 10 125°C. The SN74109 and SN74LS109A are

characterized for operation from 0°C to 70°C,