Philips Semiconductors

Product specification

74F166

8-bit bidirectional universal shift register

Feb. 14, 1991

3

PIN CONFIGURATION

16

15

14

13

12

11

10

7

6

5

4

3

2

1

9

8

VCC

Ds

D0

D1

D2

D3

CE

CP

GND

PE

D7

Q7

D6

D5

D4

MR

SP000283

LOGIC SYMBOL

Ds D0 D1 D2 D3 D4 D5 D6 D7

VCC = Pin 16

GND = Pin 8

12

34

5

10 11 12 14

13

Q7

CE

CP

MR

PE

6

7

9

15

SF00284

IEC/IEEE SYMBOL

9

15

SRG 8

1, 3D

2, 3D

13

R

M1 [SHIFT]

M2 [LOAD]

6

7

1

C3/1

1

2

3

4

5

10

11

12

14

2,3D

SF00285

FUNCTION TABLE

INPUTS

Qn REGISTER

OUTPUT

OPERATING MODE

PE

CE

CP

DS

D0 –D7

Q0

Q1 – Q6

Q7

l

l

↑

X

l – l

L

L – L

L

Parallel load

l

l

↑

X

h – h

H

H – H

H

h

l

↑

l

X – X

L

q0 – q5

q6

Serial shift

h

l

↑

h

X – X

H

q0 – q5

q6

X

h

X

X

X – X

qn

q1 – q6

q7

Hold (do nothing)

Notes to function table

1. H = High–voltage level

2. h

= High voltage level one setup time before the low–to–high clock transition

3. L

= Low–voltage level

4. l

= Low voltage level one setup time before the low–to–high clock transition

5. qn = Lower case letters indicate the state of the referenced input (or output) one setup time prior to the low–to–high clock transition

6. X = Don’t care

7.

↑ = Low–to–high clock transition