CY28508

...................... Document #: 38-07534 Rev. *F Page 11 of 13

Power supply additional current for all

3.3V VDDs for loaded REF only

Output is 14.31818 MHz with VCO

running 666.6 MHz

810

mA

Power supply current for all 2.5V VDDs

with three buffers enabled and loaded

Output is 224.7 MHz with VCO running

666.6 MHz

180

225

mA

Power supply current for all 2.5V VDDs

with two buffers enabled and loaded

Output is 224.7 MHz with VCO running

666.6 MHz

124

155

mA

Power supply current for all 2.5V VDDs

with one buffer enabled and loaded

Output is 224.7 MHz with VCO running

666.6 MHz

70

90

mA

Power supply current for all 2.5V VDDs

with all buffers disabled

Output is 224.7 MHz with VCO running

666.6 MHz

710

mA

AC Electrical Specifications

Parameter

Description

Condition

Min.

Typ.

Max. Unit

Crystal

Xin Duty Cycle

45

55

%

Xin Period

remain within its operating range.

52.4 69.841 87.3

ns

REF Output

REF Duty Cycle

Measured at 1.5V, 15-pF lumped load.

45

50

55

%

Measured from 0.4V to 2.4V, 15-pF lumped load.

1

4

ns

REF Cycle to Cycle Jitter

Measured at 1.5V, 15-pF lumped load.

1000

ps

LOCK Output

Lock Fall Time

Measured from 2.4V to 0.4V, 10-pF lumped load and

10K

 pull-up.

0.5

2

ns

CPU Outputs

CPUT/C Duty Cycle

Measured at 0.62V at measuring point. See Figure 7.

45

50

55

%

Measured from 0.3V to 0.9V. See Figure 7.

150

500

ps

CPUT/C to CPUT/C Clock Skew Measured at 0.62V at measuring point. See Figure 7.

100

ps

CPUT/C Cycle to Cycle Jitter

Measured at 0.62V at measuring point. See Figure 7.

135

ps

Differential Voltage Swing

At load measuring point. See Figures 7 and 8.

1.24

1.5

Crossing Point Voltage

At load measuring point. See Figures 7 and 8.

0.4

0.62

0.9

V

VCO Operating Frequency

Over voltage, temperature and process

333

675

MHz

Power-on Hold Off

Outputs will be as shown in Figure 6

1.2

ms

Table 6. Slew Rate Settings Output Divider = /3 (Measured over 10

s)

M

N Range

Typ. Max. Slew Rate

(kHz/

S)

Worst-Corner Max Slew

Rate (kHz/

S)

ICP

B2b7

Ns

B7b7

Variable ICP

B8b7

49

43-65

55

100

x1

2048

1

49

65-86

75

140

x1

2048 or 1024

1

49

43-86

45

70

x1

2048

0

Parameter

Description

Condition

Min.

Typ.

Max.

Unit

Table 7. Slew Rate Settings Output Divider = /2 (Measured over 10

s)

M

N Range

Typ. Max. Slew Rate

(kHz/

S)

Worst-Corner Max Slew

Rate (kHz/

S)

ICP

B2b7

Ns

B7b7

Variable ICP

B8b7

49

43-65

80

150

x1

2048

1

49

65-86

120

200

x1

2048 or 1024

1

49

43-86

65

100

x1

2048

0