PRELIMINARY

Module Data Sheet: VCT2001A 77.760 MHz

Application: HCMOS Output-Dual Input Clock Generator

Page 2

Rev. “4” 3/28/03

VCT2001A Block Diagram

2.0

ELECTRICAL CHARACTERISTICS

Specification

Min

Typ

Max

Units

2.1

Regulated Input Supply Voltage, Vcc

3.10

3.30

3.50

V DC

2.2

Supply Current Drain… @ 3.5V

55

mA

2.3

Frequency Output

77.760

MHz

2.4

Temperature Ranges

2.4.1

Operating Temp. Range

0

70

ºC

2.4.2

Storage Temp. Range

-40

85

ºC

2.5

Timing Parameters

2.5.1

Output Rise and Fall Time (20% 80%)

-

-

3

ns

2.5.2

Input Jitter Tolerance @ 8kHz Reference

(Input Jitter Frequencies > 10 Hz)

2

-

-

µs

2.5.3

Acquisition Time (Offsetting ref. 20ppm)

-

1

-

s

2.5.4

Jitter Filter Bandwidth

-

-

10

Hz

2.5.5

Capture/pull-in range

-25

-

25

ppm

2.5.6

Free Run Frequency

-20

-

20

ppm

2.5.7

Output Duty Cycle

45

50

55

%

2.5.8

Phase Transient due to Reference switching

(Rearrangement)

50

nS

2.6

Input Logic Levels

2.6.1

‘ 0’

-0.5

0.8

V

2.6.2

‘1’

2.4

5.5

V

2.7

Output Logic Levels (into 30pF load)

2.7.1

‘0’

-0.25

0.8

V

2.7.2

‘1’

4.0

Vcc*0.9

V

2.8

Dual Reference input (HCMOS levels)

8

kHz

2.9

Output load

10

pF

ENABLE / TRISTATE

SEL AB

REF B

REF A

FORCE FREE RUN

8 KHz

ALIGNER

PHASE

DET

ANALOG

FILTER

LOW PASS

f / N

LOW

JITTER

VCXO

FREE RUN STATUS

ALARM

8 KHz

OUTPUT

19.440 MHz

PHASE

OSCILLATOR

OUTPUT