MC100E445FN データシートの表示（PDF） - Motorola => Freescale

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MC100E445FN

4-Bit Serial/Parallel Converter

Motorola => Freescale 

MC10E445 MC100E445

Perhaps the easiest way to delay the second clock relative

to the first is to take advantage of the differential clock inputs

of the E445. By connecting the clock for the second E445 to

the complimentary clock input pin the device will clock a half

a clock period after the first E445 (Figure 7). Utilizing this

simple technique will raise the potential conversion

frequency up to 1.4GHz. The divide by eight clock of the

second E445 should be used to synchronize the parallel data

to the rest of the system as the parallel data of the two E445’s

will no longer be synchronized. This skew problem between

the outputs can be worked around as the parallel information

will be static for eight more clock pulses.

CLOCK

CLOCK

SERIAL

INPUT

DATA

E445a

E445b

CLOCK A

700ps

(1.4GHz)

SIN SOUT

SIN SOUT

Q3 Q2 Q1 Q0

SIN

SIN

Q3 Q2 Q1 Q0

CLOCK B

Tpd CLK

to SOUT

800ps

Q7 Q6 Q5 Q4

Q3 Q2 Q1 Q0

1150ps

PARALLEL OUTPUT DATA

Figure 7. Extended Frequency 1:8 Demultiplexer

100ps

CLK

SINa

Dn-4 Dn-3 Dn-2 Dn-1 Dn Dn+1 Dn+2 Dn+3

Q0

Q1

Q2

Q3

Q4 (Q0 a)

Q5 (Q1 a)

Q6 (Q2 a)

Q7 (Q3 a)

SOUTa

SOUTb

CL/4a

CL/4b

CL/8a

CL/8b

Dn-4

Dn-3

Dn-2

Dn-1

Dn

Dn+1

Dn+2

Dn+3

Dn-4 Dn-3 Dn-2 Dn-1 Dn Dn+1 Dn+2 Dn+3

Dn-4 Dn-3 Dn-2 Dn-1 Dn Dn+1

Figure 8. Timing Diagram A. 1:8 Serial to Parallel Conversion

MOTOROLA

6

ECLinPS and ECLinPS Lite

DL140 — Rev 4

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