IBM42F10SNNAA20
IBM42F12SNNAA20
Gigabit Ethernet/Fibre Channel Small Form Factor Transceiver with Signal Detect
Transmit Signal Interface
(from host to SFF-1063/1250N-SW)
Symbol
V
o
DJ
elec-xmit
TJ
elec-xmt
Parameter
PECL Amplitude
PECL Deterministic Jitter
PECL Total Jitter
PECL Rise/Fall
PECL Differential Skew
100
Min
400
Max.
2000
0.10
0.24
350
20
Unit
mV
UI
UI
ps
ps
Notes
1
2
2
3
1. At 100Ω, differential peak-to-peak, the figure below shows the simplified circuit schematic for the SFF-1063/1250N-SW high-
speed differential input lines. Note the PECL input data lines require AC coupling capacitors on the host. A 10nF value is recom-
mended.
+Tx_DAT
50Ω
4pF
V
DD
3KΩ
3.8KΩ
50Ω
-Tx_DAT
2. Deterministic jitter (DJ) and total jitter (TJ) values are measured according to those defined in Ref [1]. Jitter values at the output of
a transmitter or receiver section assume worst case jitter values at its respective input. The Unit interval (UI) for 1062.5Mb/s is
941ps. The UI for 1250Mb/s is 800ps.
3. Rise and fall times are measured from 20 - 80%, 100Ω differential.
Receive Signal Interface
(from SFF-1063/1250N-SW to host)
Symbol
V
o
DJ
elec-rcv
TJ
elec-rcv
Parameter
PECL Amplitude
PECL Deterministic Jitter
PECL Total Jitter
PECL Differential Skew
Min
600
Max.
1000
0.36
0.61
205
Unit
mV
UI
UI
ps
Note(s)
1
2
2
1. At 100Ω, differential peak-to-peak, the figure below shows the simplified circuit schematic for the SFF-1063/1250N-SW high-speed
differential output lines. Note the PECL output data lines require AC coupling capacitors on the host. A 10NF capacitor is recom-
mended.
Rx_V
DD
50Ω
50Ω
+Rx_DAT
...
-Rx_DAT
60Ω
Rx_Gnd
2. Deterministic jitter (DJ) and total jitter (TJ) values are measured according to those defined in Ref [1]. Jitter values at the output of
a transmitter or receiver section assume worst case jitter values at its respective input. The Unit interval (UI) for 1062.5Mb/s is
941ps. The UI for 1250Mb/s is 800ps.
SFF20.01
04/11/00
Page 7 of 17
IBM [ IBM ]
