FG896 datasheet(64/162 Pages) MICROSEMI

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ProASIC3E DC and Switching Characteristics

2-50

Revision 13

Timing Characteristics

B-LVDS/M-LVDS

Bus LVDS (B-LVDS) and Multipoint LVDS (M-LVDS) specifications extend the existing LVDS standard to

high-performance multipoint bus applications. Multidrop and multipoint bus configurations may contain

any combination of drivers, receivers, and transceivers. Microsemi LVDS drivers provide the higher drive

current required by B-LVDS and M-LVDS to accommodate the loading. The drivers require series

terminations for better signal quality and to control voltage swing. Termination is also required at both

ends of the bus since the driver can be located anywhere on the bus. These configurations can be

implemented using the TRIBUF_LVDS and BIBUF_LVDS macros along with appropriate terminations.

Multipoint designs using Microsemi LVDS macros can achieve up to 200 MHz with a maximum of 20

loads. A sample application is given in Figure 2-23. The input and output buffer delays are available in

the LVDS section in Table 2-80.

Example: For a bus consisting of 20 equidistant loads, the following terminations provide the required

differential voltage, in worst-case Industrial operating conditions, at the farthest receiver: RS =60  and

RT =70 , given Z0 =50  (2") and Zstub =50  (~1.5").

Table 2-80 • LVDS

Commercial-Case Conditions: TJ = 70°C, Worst-Case VCC = 1.425 V, Worst-Case

VCCI = 2.3 V

Speed Grade

tDOUT

tDP

tDIN

tPY

Units

Std.

0.66

1.87

0.04

1.82

–1

0.56

1.59

0.04

1.55

–2

0.49

1.40

0.03

1.36

Note: For specific junction temperature and voltage supply levels, refer to Table 2-6 on page 2-5 for

derating values.

Figure 2-23 • B-LVDS/M-LVDS Multipoint Application Using LVDS I/O Buffers

...

BIBUF_LVDS

Receiver

Transceiver

Receiver

Transceiver

Driver

RS RS

Zstub

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