4-58

(NOTE 1)

PARAMETER

(V)

LIMITS

UNITS

CDP1855

CDP1855C

MIN

(NOTE 2)

TYP

MAX

MIN

(NOTE 2)

TYP

MAX

OPERATION TIMING

Maximum Clock Frequency

(Note 3)

5

3.2

4

-

3.2

4

-

MHz

10

6.4

8

-

-

-

-

MHz

Maximum Shift Frequency

(1 Device) (Note 4)

5

1.6

2

-

1.6

2

-

MHz

10

3.2

4

-

-

-

-

MHz

Minimum Clock Width

5

-

100

150

-

100

150

ns

10

-

50

75

-

-

-

ns

Minimum Clock Period

5

-

250

312

-

250

312

ns

10

-

125

156

-

-

-

ns

Clock to Shift Propagation

Delay

5

-

200

300

-

200

300

ns

10

-

100

150

-

-

-

ns

Minimum C.I. to Shift Setup

5

-

50

67

-

50

67

ns

10

-

25

33

-

-

-

ns

C.O. from Shift Propagation

Delay

5

-

450

600

-

450

600

ns

10

-

225

300

-

-

-

ns

Minimum C.I. from Shift Hold

5

-

50

75

-

50

75

ns

10

-

25

40

-

-

-

ns

Minimum Register Input

Setup

5

-

-20

10

-

-20

10

ns

10

-

-10

10

-

-

-

ns

Register after Shift Delay

5

-

400

600

-

400

600

ns

10

-

200

300

-

-

-

ns

Minimum Register after Shift

Hold

5

-

50

100

-

50

100

ns

10

-

25

50

-

-

-

ns

C.O. from C.I. Propagation

Delay

5

-

100

150

-

100

150

ns

10

-

50

75

-

-

-

ns

Register from C.I.

Propagation Delay

5

-

80

120

-

80

120

ns

10

-

40

60

-

-

-

ns

NOTES:

1. Maximum limits of minimum characteristics are the values above which all devices function.

3. Clock frequency and pulse width are given for systems using the internal clock option of the CDP1855. Clock frequency equals shift

frequency for systems not using the internal clock option.

4. Shift period for cascading of devices is increased by an amount equal to the C.I. to C.O. Propagation Delay for each device added.

CDP1855, CDP1855C