8D
7D
6D
5D
4D
3D
2D
1D
CLK
CLR
18
17
14
13
8
7
4
3
11
1
1D
C1
EN
8Q
7Q
6Q
5Q
4Q
3Q
2Q
1Q
19
16
15
12
6
5
2
9
logic symbol
†
†
This symbol is in accordance with ANSI/IEEE Std.
91-1984 and IEC Publication 617-12.
Pin numbers shown are for the DW, J, N, and W packages.
SN54273, SN54LS273, SN74273, SN74LS273
OCTAL D-TYPE FLIP-FLOP WITH CLEAR

SDLS090 – OCTOBER 1976 – REVISED MARCH 1988
Copyright  1988, Texas Instruments Incorporated
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• Contains 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

description
These monolithic, positive-edge-triggered flip-
flops utilize TTL circuitry to implement D-type
flip-flop logic with a direct clear input.
Information at the D inputs meeting the setup time
requirements is transferred to the Q outputs on the
positive-going edge of the clock pulse. Clock
triggering occurs at a particular voltage level and
is not directly related to the transition time of the
positive-going pulse. When the clock input is at
either the high or low level, the D input signal has
no effect ar the output.
These flip-flops are guaranteed to respond to
clock frequencies ranging form 0 to 30 megahertz
while maximum clock frequency is typically 40
megahertz. Typical power dissipation is 39
milliwatts per flip-flop for the ′273 and 10 milliwatts
for the ′LS273.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
CLEAR CLOCK D
Q
L X X L
H ↑ HH
H ↑LL
HLXQ
0
SN54LS273 . . . FK PACKAGE
(TOP VIEW)
SN54273, SN74LS273 ...J OR W PACKAGE
SN74273 ...N PACKAGE
SN74LS273 . . . DW OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CLR
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
V
CC
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
3212019
910111213
4
5
6
7
8
18
17
16
15
14
8D
7D
7Q
6Q
6D
2D
2Q
3Q
3D
4D
1D 1Q CLR
5D
8Q
4Q
GND
CLK
CC
V
5Q
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.