Datasheet

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SDAS198B − APRIL 1982 − REVISED AUGUST 1995
Copyright  1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
TYPE
TYPICAL MAXIMUM
CLOCK
FREQUENCY
(MHz)
TYPICAL POWER
DISSIPATION
PER FLIP-FLOP
(mW)
′ALS109A 50 6
′AS109A 129 29
description
These devices contain two independent J-K
positive-edge-triggered flip-flops. A low level at
the preset (PRE
) or clear (CLR) inputs sets or
resets the outputs regardless of the levels of the
other inputs. When PRE
and CLR are inactive
(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
(CLK) 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 can 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 as D-type flip-flops if J and K
are tied
together.
The SN54ALS109A and SN54AS109A are characterized for operation over the full military temperature range
of −55°C to 125°C. The SN74ALS109A and SN74AS109A are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS OUTPUTS
PRE CLR CLK J K Q Q
L H X X X H L
H LXXXLH
L LXXXH
†
H
†
H H ↑ LLLH
H H ↑ H L Toggle
H H ↑ LHQ0Q0
H H ↑ HHHL
H H L X X Q0 Q0
†
The output levels in this configuration are not specified to
meet the minimum levels for V
OH
if the lows at PRE
and
CLR
are near V
IL
maximum. Furthermore, this
configuration is nonstable; that is, it does not persist when
either PRE
or CLR returns to its inactive (high) level.
SN54ALS109A, SN54AS109A...J PACKAGE
SN74ALS109A, SN74AS109A...D OR N PACKAGE
(TOP VIEW)
SN54ALS109A, SN54AS109A...FK PACKAGE
(TOP VIEW)
NC − No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1CLR
1J
1K
1CLK
1PRE
1Q
1Q
GND
V
CC
2CLR
2J
2K
2CLK
2PRE
2Q
2Q
3212019
910111213
4
5
6
7
8
18
17
16
15
14
2J
2K
NC
2CLK
2PRE
1K
1CLK
NC
1PRE
1Q
1J
1CLR
NC
2Q
2Q
V 2CLR
1Q
GND
NC
CC
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