Datasheet

DS90C124, DS90C241
SNLS209L –NOVEMBER 2005–REVISED APRIL 2013 www.ti.com
Serializer Timing Requirements for TCLK
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
t
TCP
Transmit Clock Period (Figure 5) 28.6 T 200 ns
t
TCIH
Transmit Clock High Time 0.4T 0.5T 0.6T ns
t
TCIL
Transmit Clock Low Time 0.4T 0.5T 0.6T ns
t
CLKT
TCLK Input Transition Time (Figure 4) 3 6 ns
t
JIT
TCLK Input Jitter
(1)
33 ps (RMS)
(1) t
JIT
(at BER of 10e-9) specifies the allowable jitter on TCLK. t
JIT
not included in TxOUT_E_O parameter.
Serializer Switching Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
t
LLHT
LVDS Low-to-High Transition Time R
L
= 100Ω, (Figure 3) 0.6 ns
C
L
= 10 pF to GND
t
LHLT
LVDS High-to-Low Transition Time
0.6 ns
VODSEL = L
t
DIS
DIN (23:0) Setup to TCLK R
L
= 100Ω, 5 ns
C
L
= 10 pF to GND
t
DIH
DIN (23:0) Hold from TCLK
5 ns
(1)
t
HZD
DOUT ± HIGH to TRI-STATE Delay R
L
= 100Ω, 15 ns
C
L
= 10 pF to GND
t
LZD
DOUT ± LOW to TRI-STATE Delay 15 ns
(Figure 6)
(2)
t
ZHD
DOUT ± TRI-STATE to HIGH Delay 200 ns
t
ZLD
DOUT ± TRI-STATE to LOW Delay 200 ns
t
PLD
Serializer PLL Lock Time R
L
= 100Ω, (Figure 7) 10 ms
t
SD
Serializer Delay R
L
= 100Ω, (Figure 8) 3.5T +
3.5T + 10 ns
VODSEL = L, TRFB = H 2.85
R
L
= 100Ω, (Figure 8) 3.5T +
3.5T + 10 ns
VODSEL = L, TRFB = L 2.85
TxOUT_ TxOUT_Eye_Opening 5–35 MHz
0.75 UI
(5)
E_O (respect to ideal) (Figure 9)
(1) (3) (4)
(1) Specification is ensured by characterization and is not tested in production.
(2) When the Serializer output is tri-stated, the Deserializer will lose PLL lock. Resynchronization MUST occur before data transfer.
(3) t
JIT
(at BER of 10e-9) specifies the allowable jitter on TCLK. t
JIT
not included in TxOUT_E_O parameter.
(4) TxOUT_E_O is affected by pre-emphasis value.
(5) UI – Unit Interval, equivalent to one ideal serialized data bit width. The UI scales with frequency.
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