FG484 datasheet(105/212 Pages) MICROSEMI

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Military ProASIC3/EL Low Power Flash FPGAs

Revision 3

2-91

LVPECL

Low-Voltage Positive Emitter-Coupled Logic (LVPECL) is another differential I/O standard. It requires

that one data bit be carried through two signal lines. Like LVDS, two pins are needed. It also requires

external resistor termination.

The full implementation of the LVDS transmitter and receiver is shown in an example in Figure 2-28. The

building blocks of the LVPECL transmitter-receiver are one transmitter macro, one receiver macro, three

board resistors at the transmitter end, and one resistor at the receiver end. The values for the three driver

resistors are different from those used in the LVDS implementation because the output standard

specifications are different.

Figure 2-28 • LVPECL Circuit Diagram and Board-Level Implementation

Table 2-164 • Minimum and Maximum DC Input and Output Levels

DC Parameter

Description

Min.

Max.

Min.

Max.

Min.

Max.

Units

VCCI

Supply Voltage

3.0

3.3

3.6

VOL

Output Low Voltage

0.96

1.27

1.06

1.43

1.30

1.57

VOH

Output High Voltage

1.8

2.11

1.92

2.28

2.13

2.41

VIL, VIH

Input Low, Input High Voltages

3.3

3.6

3.9

VODIFF

Differential Output Voltage

0.625

0.97

0.625

0.97

0.625

0.97

VOCM

Output Common-Mode Voltage

1.762

1.98

1.762

1.98

1.762

1.98

VICM

Input Common-Mode Voltage

1.01

2.57

1.01

2.57

1.01

2.57

VIDIFF

Input Differential Voltage

300

Table 2-165 • AC Waveforms, Measuring Points, and Capacitive Loads

Input Low (V)

Input High (V)

Measuring Point* (V)

1.64

1.94

Cross point

Note:

*Measuring point = Vtrip. See Table 2-28 on page 2-27 for a complete table of trip points.

187 W

100



Z0 = 50 

100



100



–

INBUF_LVPECL

OUTBUF_LVPECL

FPGA

Bourns Part Number: CAT16-PC4F12

FG484 Datasheet(PDF) 105 Page - Microsemi Corporation

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