Datasheet

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ONET4211LD
SLLS688A – NOVEMBER 2005 – REVISED SEPTEMBER 2007
AC ELECTRICAL CHARACTERISTICS (continued)
Typical operating condition is at V
CC
= 3.3 V, I
MOD
= 30 mA, I
BIAS
= 20 mA and T
A
= 25 ° C.
over recommended operating conditions (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
R
MODTC
= 3.125 k Ω 8300
Modulation current
ppm/ ° C
temperature compensation
(2)
R
MODTC
open 630
t
r
Output rise time (20% to 80%) V
MOD+
≥ 1 V, V
MOD –
≥ 1 V, I
MOD
= 30 mA 35 55 ps
t
f
Output fall time (80% to 20%) V
MOD+
≥ 1 V, V
MOD –
≥ 1 V, I
MOD
= 30 mA 35 55 ps
Time from rising edge of DISABLE until output
t
OFF
Disable assert time (see Figure 4 ) currents fall below the maximum limits of 0.06 5 μ s
I
MOD-OFF
and I
BIAS-OFF
Time from falling edge of DISABLE until output
t
ON
Disable negate time (see Figure 5 ) 80 μ s
is 90% of nominal
From power on or negation of SDOWN using
t
INIT
Time to initialize 80 μ s
DISABLE
t
FAULT
Fault assert time Time from fault to SDOWN rising edge 3.3 50 μ s
Maximum spike pulse duration at DISABLE
0.8 μ s
being ignored
t
RESET
DISABLE reset (see Figure 6 )
DISABLE high time required to reset SDOWN 6 μ s
Output overshoot/undershoot – 29% 29%
Random jitter I
MOD
= 60 mA 0.6 0.9 ps
RMS
10 mA ≤ I
MOD
≤ 60 mA, with K28.5 pattern
15 30 ps
p-p
at 4.25 Gbps
10 mA ≤ I
MOD
≤ 60 mA, with 2
23
– 1 PRBS or
13 32 ps
p-p
equivalent pattern at 2.67 Gbps
DJ Deterministic jitter
(3)
K28.5 pattern at 1.06 Gbps 5 ps
p-p
2
23
– 1 PRBS or equivalent pattern at 155 10 ps
p-p
Mbps
(2) For a given external resistor connected to the MODTC pin, the modulation-current temperature compensation varies due to part-to-part
variations.
(3) Jitter measured at positive edge and negative edge crossing of eye diagram.
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