M1AFS600-PQ208 Datasheet, PDF (230/334 Pages) Microsemi Corporation – Fusion Family of Mixed Signal FPGAs

Device Architecture
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 2-136.
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.
OUTBUF_LVPECL ^FPGA
Bourns Part Number: CAT16-PC4F12
P
100 
100 
N
P
ZO = 50 
187 W
100 
ZO = 50 
N
FPGA
+
–
INBUF_LVPECL
Figure 2-136 • LVPECL Circuit Diagram and Board-Level Implementation
Table 2-171 • Minimum and Maximum DC Input and Output Levels
DC Parameter
Description
Min. Max.
VCCI
Supply Voltage
3.0
VOL
Output Low Voltage
0.96 1.27
VOH
Output High Voltage
1.8 2.11
VIL, VIH
Input Low, Input High Voltages
0
3.6
VODIFF
Differential Output Voltage
0.625 0.97
VOCM
Output Common Mode Voltage
1.762 1.98
VICM
Input Common Mode Voltage
1.01 2.57
VIDIFF
Input Differential Voltage
300
Min. Max.
3.3
1.06 1.43
1.92 2.28
0
3.6
0.625 0.97
1.762 1.98
1.01 2.57
300
Min. Max.
3.6
1.30 1.57
2.13 2.41
0
3.6
0.625 0.97
1.762 1.98
1.01 2.57
300
Units
V
V
V
V
V
V
V
mV
Table 2-172 • AC Waveforms, Measuring Points, and Capacitive Loads
Input Low (V)
Input High (V)
Measuring Point* (V)
VREF (typ.) (V)
1.64
1.94
Cross point
–
Note: *Measuring point = Vtrip. See Table 2-90 on page 2-169 for a complete table of trip points.
Timing Characteristics
Table 2-173 • LVPECL
Commercial Temperature Range Conditions: T_J = 70°C, Worst-Case VCC = 1.425 V,
Worst-Case VCCI = 3.0 V
Applicable to Pro I/Os
Speed Grade
Std.
t_DOUT
0.66
t_DP
2.14
t_DIN
0.04
t_PY
1.63
Units
ns
–1
0.56
1.82
0.04
1.39
ns
–2
0.49
1.60
0.03
1.22
ns
Note: For the derating values at specific junction temperature and voltage supply levels, refer to Table 3-7 on
page 3-9.
2-214
Revision 4