DS90UB948-Q1_16 Datasheet, PDF (15/88 Pages) Texas Instruments – FPD-Link III to OpenLDI Deserializer

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DS90UB948-Q1
SNLS477A – OCTOBER 2014 – REVISED JANUARY 2016
7.9 Switching Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified.
PARAMETER
TEST CONDITIONS
PIN/FREQ. MIN
LVDS DRIVER SWITCHING CHARACTERISTICS
t_LVLHT
LVDS Low-to-High Transition
Time
20% to 80% transition. 5pF load.
See Figure 9.
t_LVHLT
LVDS High-to-Low Transition
Time
80% to 20% transition. 5pF load.
See Figure 9.
t_BIT
t_PPOS0
Transmitter Output Bit Width
Transmitter Output Pulse
Positions Normalized for Bit 0
t_PPOS1
Transmitter Output Pulse
Positions Normalized for Bit 1
t_PPOS2
t_PPOS3
t_PPOS4
t_PPOS5
t_PPOS6
Transmitter Output Pulse
Positions Normalized for Bit 2
Transmitter Output Pulse
Positions Normalized for Bit 3
Transmitter Output Pulse
Positions Normalized for Bit 4
Transmitter Output Pulse
Positions Normalized for Bit 5
Transmitter Output Pulse
Positions Normalized for Bit 6
T = 1 / OLDI Clock frequency.
See Figure 11.
D0±, D1±,
D2±, D3±,
D4±, D5±,
D6±, D7±,
CLK1±,
CLK2±
t_PPOS
Transmitter Output Pulse
Positions (Bit 6 - Bit 0)
Normalized
t_CCS
Channel-to-Channel Skew
t_JCC
2-lane FPD-Link III Input, Dual
OpenLDI Output
Transmitter Jitter Cycle-to-Cycle
2-lane FPD-Link III Input, Single
OpenLDI Output
1-lane FPD-Link III Input, Dual
OpenLDI Output
1-lane FPD-Link III Input, Single
OpenLDI Output
t_PDD
Transmitter Power Down Delay See Figure 5.
t_DD
Deserializer Propagation Delay
T = 1 / OLDI Clock frequency.
See Figure 4.
(1) Parameter is specified by bench characterization and is not tested in production.
(2) UI - Unit Interval is equal to 1 / (7 * OLDI Clock).
TYP
MAX UNIT
0.15 0.25⁽¹⁾ ns
0.15
1/7 * T
1
0.25⁽¹⁾ ns
ns
UI ⁽²⁾
2
UI ⁽²⁾
3
UI ⁽²⁾
4
UI ⁽²⁾
5
UI ⁽²⁾
6
UI ⁽²⁾
7
UI ⁽²⁾
<0.1
100
0.16
0.18
0.04
0.04
100
147 * T
UI ⁽²⁾
ps
UI ⁽²⁾
UI ⁽²⁾
UI ⁽²⁾
UI ⁽²⁾
ns
ns
7.10 Timing Diagrams and Test Circuits
CLK1±,
CLK2±
D1±, D3±,
D5±, D7±
D0±, D2±,
D4±, D6±
Cycle N
Cycle N+1
+VOD
-VOD
+VOD
-VOD
+VOD
-VOD
Figure 1. Checkerboard Data Pattern
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