7

Transceiver Reference Clock Requirements

T = 0

Symbol

Parameter

Units

Min.

Typ.

Max.

f

Nominal Frequency (for Gigabit Ethernet Compliance)

MHz

125

f

Nominal Frequency (for Fibre Channel Compliance)

MHz

106.25

Frequency Tolerance

ppm

–100

+100

Symm

Symmetry (Duty Cycle)

%

40

60

TTL I/O DC Electrical Specifications

Symbol

Parameter

Units

Min.

Typ.

Max.

TTL Input High Voltage Level,

V

2

5.5

Guaranteed High Signal for All Inputs

TTL Input Low Voltage Level,

V

0

0.8

Guaranteed Low Signal for All Inputs

V

2.2

V

0

0.5

µA40

µA

–600

mA

800

AC Electrical Specifications (TRx)

Symbol

Parameter

Units

Min.

Typ.

Max.

RFCT Rise Time, 0.8 to 2.0 Volts

ns

0.2

2.4

RFCT Fall Time, 2.0 to 0.8 Volts

ns

0.2

2.4

Input TTL Rise Time, 0.8 to 2.0 Volts

ns

1.0

Input TTL Fall Time, 2.0 to 0.8 Volts

ns

1.0

Output TTL Rise Time, 0.8 to 2.0 Volts, 10 pF Load

ns

1.5

2.4

Output TTL Fall Time, 2.0 to 0.8 Volts, 10 pF Load

ns

1.1

2.4

HS_OUT Single-Ended SO [0:3]

± Rise Time

ps

200

300

HS_OUT Single-Ended SO [0:3]

± Fall Time

ps

200

300

HS_OUT Differential Rise Time

ps

200

300

HS_OUT Differential Fall Time

ps

200

300

HS_IN Input Peak-To-Peak Differential Voltage

mV

200

1200

2000

HS_OUT Output Pk-Pk Diff. Voltage (Z0=50 Ohms, Fig.10) mV

1000

1300

1800

Note:

1. Output Peak-to-Peak Differential Voltage specified as SO [0:3]+ minus SO [0:3]–. The output will be 25% higher when terminating into 75

Ω loads.