Texas Instruments JM38510-34101B2A, JM38510-34101BDA, JM38510-34101BCA, SN54F74J, SN74F74D Datasheet
...
SN54F74, SN74F74
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SDFS046A – MARCH 1987 – REVISED OCT OBER 1993
• Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These devices contain two independent positiveedge-triggered D-type flip-flops. A low level at the
preset (PRE
the outputs regardless of the levels of the other
inputs. When PRE
data at the data (D) input meeting the setup time
requirements is 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 at the
D input may be changed without affecting the
levels at the outputs.
The SN54F74 is characterized for operation over
the full military temperature range of –55°C to
125°C. The SN74F74 is characterized for
operation from 0°C to 70°C.
) or clear (CLR) inputs sets or resets
and CLR are inactive (high),
SN54F74 ...J PACKAGE
SN74F74 ...D OR N PACKAGE
1CLR
1CLK
1PRE
1CLK
NC
1PRE
NC
1Q
(TOP VIEW)
14
13
12
11
10
NC
V
2CLR
2D
2CLK
2PRE
2Q
9
2Q
8
CC
V
2CLR
18
17
16
15
14
1
1D
2
3
4
1Q
5
1Q
6
GND
7
SN54F74 . . . FK PACKAGE
(TOP VIEW)
1D
1CLR
3212019
4
5
6
7
8
910111213
CC
2D
NC
2CLK
NC
2PRE
FUNCTION TABLE
INPUTS
PRE CLR CLK D Q Q
L H X X H L
H LXXLH
LLXXH
HH↑HHL
HH↑LLH
HHLXQ
†
The output levels are not guaranteed to meet the
minimum levels for VOH. Furthermore, this
configuration is nonstable; that is, it will not persist
when PRE
level.
or CLR returns to its inactive (high)
OUTPUTS
†
H
Q
0
†
0
GND
NC
2Q
1Q
NC – No internal connection
2Q
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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1993, Texas Instruments Incorporated
2–1
SN54F74, SN74F74
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SDFS046A – MARCH 1987 – REVISED OCT OBER 1993
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
†
1PRE
1CLK
1D
1CLR
2PRE
2CLK
2D
2CLR
4
3
2
1
10
11
12
13
S
C1
1D
R
logic diagram, each flip-flop (positive logic)
PRE
CLK
C
C
C
TG
5
1Q
6
1Q
9
2Q
8
2Q
Q
CLR
C
D
TG
C
TG
C
C
C
C
TG
C
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
Input voltage range, V
Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state –0.5 V to V
Current into any output in the low state 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54F74 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
(see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74F74 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Q
‡
CC
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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