Datasheet

DS25BR204
SNLS259D –NOVEMBER 2007–REVISED MARCH 2013 www.ti.com
AC Electrical Characteristics
Over recommended operating supply and temperature ranges unless otherwise specified.
(1) (2)
Symbol Parameter Conditions Min Typ Max Units
LVDS OUTPUT AC SPECIFICATIONS
t
PLHD
Differential Propagation Delay Low to 460 600 ps
High
(3)
R
L
= 100Ω
t
PHLD
Differential Propagation Delay High to 420 600 ps
Low
(3)
t
SKD1
Pulse Skew |t
PLHD
− t
PHLD
| 40 100 ps
(2) (4)
t
SKD2
Channel to Channel Skew 55 110 ps
(5) (3)
t
SKD3
Part to Part Skew 50 190 ps
(3) (6)
t
LHT
Rise Time
(3)
80 160 ps
R
L
= 100Ω
t
HLT
Fall Time
(3)
80 160 ps
t
ON
Any PWDN to Output Active Time 8 20 μs
t
OFF
Any PWDN to Output Inactive Time 5 12 ns
t
SEL
Select Time 5 12 ns
JITTER PERFORMANCE WITH EQ = Off, PE = Off
(3)
(Figure 5)
t
RJ1
Random Jitter (RMS Value) V
ID
= 350 mV 2.5 Gbps 0.5 1 ps
No Test Channels V
CM
= 1.2V
t
RJ2
3.125 Gbps 0.5 1 ps
(7)
Clock (RZ)
t
DJ1
Deterministic Jitter (Peak to Peak) V
ID
= 350 mV 2.5 Gbps 11 19 ps
No Test Channels V
CM
= 1.2V
t
DJ2
3.125 Gbps 13 24 ps
(8)
K28.5 (NRZ)
t
TJ1
Total Jitter (Peak to Peak) V
ID
= 350 mV 2.5 Gbps 0.05 0.10 UI
P-P
No Test Channels V
CM
= 1.2V
t
TJ2
3.125 Gbps 0.07 0.13 UI
P-P
(9)
PRBS-23 (NRZ)
JITTER PERFORMANCE WITH EQ = Off, PE = On
(3)
(Figure 6, Figure 9)
t
RJ1B
Random Jitter (RMS Value) V
ID
= 350 mV 2.5 Gbps 0.5 1 ps
Test Channel B V
CM
= 1.2V
t
RJ2B
3.125 Gbps 0.5 1 ps
(7)
Clock (RZ)
t
DJ1B
Deterministic Jitter (Peak to Peak) V
ID
= 350 mV 2.5 Gbps 10 23 ps
Test Channel B V
CM
= 1.2V
t
DJ2B
3.125 Gbps 4 20 ps
(8)
K28.5 (NRZ)
t
TJ1B
Total Jitter (Peak to Peak) V
ID
= 350 mV 2.5 Gbps 0.06 0.10 UI
P-P
Test Channel B V
CM
= 1.2V
t
TJ2B
3.125 Gbps 0.05 0.13 UI
P-P
(9)
PRBS-23 (NRZ)
JITTER PERFORMANCE WITH EQ = On, PE = Off
(3)
(Figure 7, Figure 9)
t
RJ1D
Random Jitter (RMS Value) V
ID
= 350 mV 2.5 Gbps 0.5 1 ps
Test Channel D V
CM
= 1.2V
t
RJ2D
3.125 Gbps 0.5 1 ps
(7)
Clock (RZ)
(1) The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not guaranteed.
(2) Typical values represent most likely parametric norms for V
CC
= +3.3V and T
A
= +25°C, and at the Recommended Operation Conditions
at the time of product characterization and are not guaranteed.
(3) Specification is guaranteed by characterization and is not tested in production.
(4) t
SKD1
, |t
PLHD
− t
PHLD
|, Pulse Skew, is the magnitude difference in differential propagation delay time between the positive going edge and
the negative going edge of the same channel.
(5) t
SKD2
, Channel to Channel Skew, is the difference in propagation delay (t
PLHD
or t
PHLD
) among all output channels in Broadcast mode
(any one input to all outputs).
(6) t
SKD3
, Part to Part Skew, is defined as the difference between the minimum and maximum differential propagation delays. This
specification applies to devices at the same V
CC
and within 5°C of each other within the operating temperature range.
(7) Measured on a clock edge with a histogram and an accumulation of 1500 histogram hits. Input stimulus jitter is subtracted geometrically.
(8) Tested with a combination of the 1100000101 (K28.5+ character) and 0011111010 (K28.5- character) patterns. Input stimulus jitter is
subtracted algebraically.
(9) Measured on an eye diagram with a histogram and an accumulation of 3500 histogram hits. Input stimulus jitter is subtracted.
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