DM74LS109A Datasheet, PDF (1/5 Pages) Fairchild Semiconductor – Dual Positive-Edge-Triggered J-K Flip-Flop with Preset, Clear, and Complementary Outputs

June 1986
Revised March 2000
DM74LS109A
Dual Positive-Edge-Triggered J-K Flip-Flop with
Preset, Clear, and Complementary Outputs
General Description
This device contains two independent positive-edge-trig-
gered J-K flip-flops with complementary outputs. The J and
K data is accepted by the flip-flop on the rising edge of the
clock pulse. The triggering occurs at a voltage level and is
not directly related to the transition time of the rising edge
of the clock. The data on the J and K inputs may be
changed while the clock is HIGH or LOW as long as setup
and hold times are not violated. A low logic level on the
preset or clear inputs will set or reset the outputs regard-
less of the logic levels of the other inputs.
Ordering Code:
Order Number Package Number
Package Description
DM74LS109AM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS109AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Inputs
Outputs
PR CLR CLK J K
Q
Q
L
H
X XX
H
L
H
L
X XX
L
H
L
L
X X X H (Note 1) H (Note 1)
H
H
↑
LL
L
H
H
H
↑ HL
Toggle
H
H
↑
LH
Q₀
Q₀
H
H
↑ HH
H
L
H
H
L
XX
Q₀
Q₀
H = HIGH Logic Level
L = LOW Logic Level
X = Either LOW or HIGH Logic Level
↑ = Rising Edge of Pulse
Q₀ = The output logic level of Q before the indicated input conditions were
established.
Toggle = Each output changes to the complement of its previous level on
each active transition of the clock pulse.
Note 1: This configuration is nonstable; that is, it will not persist when pre-
set and/or clear inputs return to their inactive (HIGH) state.
© 2000 Fairchild Semiconductor Corporation DS006368
www.fairchildsemi.com