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OUTPUTS (LVPECL OR LVDS)

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS

CDCE421

SCAS842 – APRIL 2007

The CDCE421 device has two sets of output drivers, LVPECL and LVDS, where the outputs are wire-ORed

together. Only one output can be selected at a time; the other goes to the high-impedance state (Hi-Z).

If the device is configured for an LVPECL, the output buffers go to Hi-Z and the termination resistors determine

the state of the output (LVPECLP = LVPECLN = Hi-Z) in the device disable mode (CE = L). If the device is

configured in LVDS mode, the outputs go to Hi-Z if the device is disabled (CE = L).

VALUE

UNIT

–0.5 to 4.6

V

V

Output current for LVPECL

–50

mA

Electrostatic discharge (HBM)

2

kV

Characterized free-air temperature range (no airflow)

–40 to 85

°C

Maximum junction temperature

125

°C

Storage temperature range

–65 to 150

°C

(1)

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

All voltage values are with respect to network ground terminal.

over operating free-air temperature range (unless otherwise noted)

MIN

TYP

MAX

UNIT

Supply voltage

3

3.3

3.6

V

Ambient temperature (no airflow, no heat sink)

–40

85

°C

recommended operating conditions for CDCE421 device

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Supply voltage

3

3.3

3.6

V

Total current

LVDS mode, 3.3 V, 366 MHz

73

93

mA

LVPECL mode, 3.3 V, 366 MHz

91

110

mA

LVDS OUTPUT MODE (see Figure 10)

Output frequency

10.9

400

MHz

LDVS differential output voltage

240

400

454

mV

∆V

OD

LVDS VOD magnitude change

50

mV

Offset voltage

–40

°C to 85°C

0.84

1.1

1.39

V

∆V

OS

VOS magnitude change

25

mV

Output rise time

170

ps

Output fall time

170

ps

–20

mA

20

mA

Duty cycle of the output waveform

46%

50%

53%

13

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