Si5321

Rev. 2.3

7

Table 3. AC Characteristics

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Input Clock Frequency (CLKIN)

FEC[2:0] = 000 (non FEC)

INFRQSEL[2:0] = 001

INFRQSEL[2:0] = 010

INFRQSEL[2:0] = 011

INFRQSEL[2:0] = 100

INFRQSEL[2:0] = 101

INFRQSEL[2:0] = 110

No FEC Scaling

19.436

38.872

77.744

155.48

310.97

621.95

—

—

—

—

—

—

21.685

43.369

86.738

173.48

346.95

693.90

MHz

Input Clock Frequency (CLKIN)

FEC[2:0] = 001 (forward FEC)

INFRQSEL[2:0] = 001

INFRQSEL[2:0] = 010

INFRQSEL[2:0] = 011

INFRQSEL[2:0] = 100

INFRQSEL[2:0] = 101

INFRQSEL[2:0] = 110

255/238 FEC Scaling

18.142

36.284

72.568

145.13

290.27

580.54

—

—

—

—

—

—

20.239

40.478

80.955

161.91

323.82

647.64

MHz

Input Clock Frequency (CLKIN)

FEC[2:0] = 010 (reverse FEC)

INFRQSEL[2:0] = 001

INFRQSEL[2:0] = 010

INFRQSEL[2:0] = 011

INFRQSEL[2:0] = 100

INFRQSEL[2:0] = 101

INFRQSEL[2:0] = 110

238/255 FEC Scaling

20.826

41.652

83.305

166.61

333.22

666.44

—

—

—

—

—

—

23.234

46.465

92.934

185.87

371.74

743.47

MHz

Input Clock Frequency (CLKIN)

FEC[2:0] = 100 (forward FEC)

INFRQSEL[2:0] = 001

INFRQSEL[2:0] = 010

INFRQSEL[2:0] = 011

INFRQSEL[2:0] = 100

INFRQSEL[2:0] = 101

INFRQSEL[2:0] = 110

255/237 FEC Scaling

Minimum input frequency

is in the 155 MHz range

N/A

N/A

N/A

144.52

289.05

578.11

N/A

N/A

N/A

—

—

—

N/A

N/A

N/A

161.23

322.46

644.92

MHz

Input Clock Frequency (CLKIN)

FEC[2:0] = 101 (reverse FEC)

INFRQSEL[2:0] = 001

INFRQSEL[2:0] = 010

INFRQSEL[2:0] = 011

INFRQSEL[2:0] = 100

INFRQSEL[2:0] = 101

INFRQSEL[2:0] = 110

237/255 FEC Scaling

Minimum input frequency

is in the 155 MHz range

N/A

N/A

N/A

167.31

334.62

669.25

N/A

N/A

N/A

—

—

—

N/A

N/A

N/A

186.66

373.31

746.61

MHz

Note: The Si5321 provides a 1/32x, 1/16x, 1/8x, 1/4x, 1/2x, 1x, 2x, 4x, 8x, 16x, 32x, 64x, or 128x clock multiplication function

with an option for additional frequency scaling by a factor of 255/238, 238/255, 255/237, 237/255, 66/64, or 64/66 for

FEC rate conversion.