TEXAS INSTRUMENTS SN54ALS273, SN74ALS273 Technical data
SN54ALS273, SN74ALS273
OUTPUT
OCTAL D-TYPE FLIP-FLOPS
WITH CLEAR
SDAS218A – APRIL 1982 – REVISED DECEMBER 1994
• Contain Eight Flip-Flops With Single-Rail
Outputs
• Buffered Clock and Direct-Clear Inputs
• Individual Data Input to Each Flip-Flop
• Applications Include:
Buffer/Storage Registers
Shift Registers
Pattern Generators
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These octal positive-edge-triggered flip-flops
utilize TTL circuitry to implement D-type flip-flop
logic with a direct-clear (CLR
Information at the data (D) inputs meeting the
setup-time requirements is transferred to the
Q outputs on the positive-going edge of the clock
(CLK) pulse. Clock triggering occurs at a particular
voltage level and is not directly related to the
transition time of the positive-going pulse. When
CLK is at either the high or low level, the D input
signal has no effect at the output.
) input.
SN54ALS273 ...J PACKAGE
SN74ALS273 . . . DW OR N PACKAGE
SN54ALS273 . . . FK PACKAGE
2D
2Q
3Q
3D
4D
(TOP VIEW)
1
CLR
2
1Q
3
1D
4
2D
5
2Q
6
3Q
7
3D
8
4D
9
4Q
GND
10
(TOP VIEW)
1D1QCLR
3212019
4
5
6
7
8
910111213
20
19
18
17
16
15
14
13
12
11
V
CC
V
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
8Q
18
17
16
15
14
CC
8D
7D
7Q
6Q
6D
The SN54ALS273 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS273 is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
CLK D
CLR
L X X L
H ↑ HH
H↑LL
HH or L X Q
OUTPUT
Q
0
4Q
CLK
GND
5Q
5D
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 1994, Texas Instruments Incorporated
1
SN54ALS273, SN74ALS273
OCTAL D-TYPE FLIP-FLOPS
WITH CLEAR
SDAS218A – APRIL 1982 – REVISED DECEMBER 1994
logic symbol
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
†
CLR
CLK
1D
2D
3D
4D
5D
6D
7D
8D
1
11
3
4
7
8
13
14
17
18
R
C1
1D
logic diagram (positive logic)
CLK
1D
11
3
1D
C1
R
2D
4
1D
C1
R
3D
4D
7
1D
C1
R
8
1D
R
5D
13
C1
1D
R
C1
12
15
16
19
2
5
6
9
6D
14
1D
R
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
C1
7D
17
1D
R
C1
8D
18
1D
C1
R
1
CLR
2
1Q
2Q
5
3Q
6
4Q
9
5Q
12
6Q
15
7Q
16
8Q
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
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.
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
: SN54ALS273 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
SN74ALS273 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
‡
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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