CLK

1D

3

1D

C1

R

1Q

2

2D

4

1D

C1

R

2Q

5

3D

7

1D

C1

R

3Q

6

4D

8

1D

C1

R

4Q

9

5D

13

1D

C1

R

5Q

12

6D

14

1D

C1

R

6Q

15

7D

17

1D

C1

R

7Q

16

8D

18

1D

C1

R

8Q

19

CLR

11

1

Copyright © 2016, Texas Instruments Incorporated

11

SN54HC273, SN74HC273

www.ti.com

SCLS136E – DECEMBER 1982 – REVISED JULY 2016

Product Folder Links: SN54HC273 SN74HC273

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Copyright © 1982–2016, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The SNx4HC273 contains eight flip-flops with single-rail outputs with individual data input to each flip-flop. The

outputs can drive up to 10 LSTTL loads. The device has direct active low clear input.

8.2 Functional Block Diagram

8.3 Feature Description

The SNx4HC273 also has very low input current, with the maximum set at 1 µA.

8.4 Device Functional Modes

Table 1 lists the functional modes of the SNx4HC273.

Table 1. Function Table (Each Flip-Flop)

INPUTS

OUTPUT

Q

CLR

CLK

D

L

X

X

L

H

↑

H

H

H

↑

L

L

H

L

X