DS1035 Datasheet, PDF (50/106 Pages) Dallas Semiconductor – 3-in-1 High.Speed Silicon Delay Line

DC and Switching Characteristics
MachXO2 Family Data Sheet
BLVDS
The MachXO2 family supports the BLVDS standard through emulation. The output is emulated using complemen-
tary LVCMOS outputs in conjunction with resistors across the driver outputs. The input standard is supported by
the LVDS differential input buffer. BLVDS is intended for use when multi-drop and bi-directional multi-point differen-
tial signaling is required. The scheme shown in Figure 3-2 is one possible solution for bi-directional multi-point dif-
ferential signals.
Figure 3-2. BLVDS Multi-point Output Example
2.5V
16mA
Heavily loaded backplane, effective Zo ~ 45 to 90 ohms differential
80 45-90 ohms
45-90 ohms
80
2.5V
16mA
2.5V
16mA
+
-
80
80
80
. . . ⁸⁰
80
2.5V
16mA
-
-
2.5V
2.5V
2.5V
2.5V
16mA
16mA
16mA
16mA
Table 3-2. BLVDS DC Conditions¹
Over Recommended Operating Conditions
Symbol
Description
Z_OUT
Output impedance
R_S
Driver series resistance
R_TLEFT
Left end termination
R_TRIGHT
Right end termination
V_OH
Output high voltage
V_OL
Output low voltage
V_OD
Output differential voltage
V_CM
Output common mode voltage
I_DC
DC output current
1. For input buffer, see LVDS table.
Nominal
Zo = 45
Zo = 90
10
10
80
80
45
90
45
90
1.376
1.480
1.124
1.020
0.253
0.459
1.250
1.250
11.236
10.204
Units
Ohms
Ohms
Ohms
Ohms
V
V
V
V
mA
3-11