SN54ALS74A_15 Datasheet, PDF (1/19 Pages) Texas Instruments – DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH CLEAR AND PRESET

SN54ALS74A, SN54AS74A, SN74ALS74A, SN74AS74A
DUAL POSITIVEĆEDGEĆTRIGGERED DĆTYPE FLIPĆFLOPS
WITH CLEAR AND PRESET
SDAS143C − APRIL 1982 − REVISED AUGUST 1995
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
TYPE
′ALS74A
′AS74A
TYPICAL MAXIMUM
CLOCK FREQUENCY
(CL = 50 pF)
(MHz)
50
134
TYPICAL POWER
DISSIPATION
PER FLIP-FLOP
(mW)
6
26
SN54ALS74A, SN54AS74A . . . J PACKAGE
SN74ALS74A, SN74AS74A . . . D OR N PACKAGE
(TOP VIEW)
1CLR 1
1D 2
1CLK 3
1PRE 4
1Q 5
1Q 6
GND 7
14 V_CC
13 2CLR
12 2D
11 2CLK
10 2PRE
9 2Q
8 2Q
description
These devices contain two independent
positive-edge-triggered D-type 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 data (D) input 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
CLK. Following the hold-time interval, data at the
D input can be changed without affecting the
levels at the outputs.
The SN54ALS74A and SN54AS74A are
characterized for operation over the full military
temperature range of − 55°C to 125°C. The
SN74ALS74A and SN74AS74A are characterized
for operation from 0°C to 70°C.
SN54ALS74A, SN54AS74A . . . FK PACKAGE
(TOP VIEW)
1CLK
NC
1PRE
NC
1Q
3 2 1 20 19
4
18
5
17
6
16
7
15
8
14
9 10 11 12 13
2D
NC
2CLK
NC
2PRE
NC − No internal connection
FUNCTION TABLE
INPUTS
OUTPUTS
PRE CLR CLK D
L
H
X
X
H
L
X
X
L
L
X
X
H
H
↑
H
H
H
↑
L
Q
Q
H
L
L
H
H† H†
H
L
L
H
H
H
L
X
Q0 Q0
† _{The output levels in this configuration are not}
specified to meet the minimum levels for VOH if the
lows at PRE and CLR are near VIL maximum.
Furthermore, this configuration is nonstable; that
is, it does not persist when PRE or CLR returns to
its inactive (high) level.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  1995, Texas Instruments Incorporated
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