DS1035 Datasheet, PDF (51/106 Pages) Dallas Semiconductor – 3-in-1 High.Speed Silicon Delay Line

DC and Switching Characteristics
MachXO2 Family Data Sheet
LVPECL
The MachXO2 family supports the differential LVPECL standard through emulation. This output standard is emu-
lated using complementary LVCMOS outputs in conjunction with resistors across the driver outputs on all the
devices. The LVPECL input standard is supported by the LVDS differential input buffer. The scheme shown in Dif-
ferential LVPECL is one possible solution for point-to-point signals.
Figure 3-3. Differential LVPECL
V_CCIO = 3.3V
16mA
93 ohms
V_CCIO = 3.3V
16mA
On-chip
93 ohms
Off-chip
196 ohms
100 ohms
Transmission line, Zo = 100 ohm differential
Off-chip
+
-
On-chip
Table 3-3. LVPECL DC Conditions¹
Over Recommended Operating Conditions
Symbol
Description
Z_OUT
Output impedance
R_S
Driver series resistor
R_P
Driver parallel resistor
R_T
Receiver termination
V_OH
Output high voltage
V_OL
Output low voltage
V_OD
Output differential voltage
V_CM
Output common mode voltage
Z_BACK
Back impedance
I_DC
DC output current
1. For input buffer, see LVDS table.
Nominal
10
93
196
100
2.05
1.25
0.80
1.65
100.5
12.11
Units
Ohms
Ohms
Ohms
Ohms
V
V
V
V
Ohms
mA
For further information on LVPECL, BLVDS and other differential interfaces please see details of additional techni-
cal documentation at the end of the data sheet.
3-12