MGBC-20-4-X-XL Optical Gigabit Ethernet - +3.3V
Gigabit Interface Converter (GBIC)
®
Features
n
Compliant with Gigabit Interface Converter
(GBIC) operational specifications
n
Compliant With IEEE802.3z 1000BASE-LX and
1000BASE-SX
n
Hot pluggable
n
Single +3.3V Power Supply
n
Supports Serial ID functionality
PRODUCT OVERVIEW
The MGBC-20-4-X-XL GBIC transceiver module is a high
performance integrated duplex data link for bi-directional
communication over single mode or multimode optical
fiber. It is compliant with the Gigabit Interface Converter
(GBIC) specification. The MGBC-20 is specifically
designed for high speed Gigabit Ethernet data links at
1.25 Gb/s. The Methode GBIC transceiver is hot
pluggable which allows a suitably designed enclosure to
be changed from one type of external interface to
another simply by plugging in a GBIC having the alterna-
tive external interface. The MGBC-20-4-X-XL operates at
3.3V.
SHORT WAVELENGTH LASER
The use of short wavelength lasers and high volume
production processes has resulted in a low cost, high
performance datalink which communicates reliably at
distances of 500 m over 50µm multimode optical fiber
with data transfer rates of 1.25 GBaud.
LONG WAVELENGTH LASER
For intermediate and long reach data links, the
MGBC-20-4-2-XL with single mode optics can extend the
interconnect distance in excess of 20km.
ORDERING INFORMATION
MGBC - 20 - 4 - X - XL
MODULE SPECIFICATIONS - ABSOLUTE MAXIMUM RATINGS
PARAMET ER
Storage Temperature
Supply Voltage
Data AC Voltage
Data DC Voltage
SYMBOL
Tstg
V
DD
T, V
DD
R
Tx+, Tx-
Tx+, Tx-
MIN
-40
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+3.3V POWER SUPPLY
SERIAL IDENTIFICATION OPTION
Blank
- No Serial ID
S
- Serial ID
WAVELENGTH
1
- 850nm ( multimode )
2
- 1300nm (single mode) 2km
2M
- 1300nm (single mode) 10km
2L
- 1300nm (single mode) 20km
COMMUNICATIONS PROTOCOL
6
- Fibre Channel 1.0625 GBaud
4
- Gigabit Ethernet 1.25 GBaud
-10
MAX
85
6.00
2.6
10
UNIT S
°C
V
Vpp
Vpk
NOT ES
V
DD
- ground
Differential
V (Tx+ or Tx-) - ground
MODULE SPECIFICATION - RECOMMENDED OPERATING CONDITIONS
PARAMET ER
Ambient Operating Temperature
Supply Voltage
Baud Rate
SYMBOL
Ta
V
DD
T, V
DD
R
BRate
MIN
0
3.15
T YP
3.3
1250
MAX
70
3.45
UNIT S
°C
VDC
MBaud
NOT ES
9245.01
MGBC-20-4-X-XL Optical Gigabit Ethernet - +3.3V
Gigabit Interface Converters (GBIC)
PERFORMANCE SPECIFICATIONS - ELECTRICAL
PAR AMETER
Bi t Error Rate
Supply C urrent
SYMB OL
BER
lcc
lcc
Surge C urrent
Isurge
12
120
MIN
TYP
MAX
1E-12
150
200
+30
mA
mA
mA
U N ITS
N OTES
Errors/Bi t @ Pr mi n
T = 25°C , Vcc = 3.3 V
a
0° C <T < 70°C , 3.15 V< Vcc
a
<3.45V
®
Ta = 25° C, Vcc = 3.3 V
TR AN SMITTER
PEC L Input (D i fferenti al)
Input Impedance (D i fferenti al)
Tx_D ISABLE Input Voltage - Hi gh
Tx_D ISABLE Input Voltage - Low
Tx_FAULT output voltage -- hi gh
Tx_FAULT output voltage -- low
R EC EIVER
PEC L Output (D i fferenti al)
Output Impedance (D i fferenti al)
Rx_LOS Output Voltage - Hi gh
Rx_LOS Output Voltage - Low
T tal Ji tter [ Pk - Pk ]
o
Output Ri se/Fall ti me
MOD _D EF ( 0:2 )
PERFORMANCE SPECIFICATIONS - OPTICAL 850 nm Laser Multimode
PAR AMETER
FIB ER LEN GTH
50
µ
m C ore D i ameter MMF
62.5
µ
m C ore D i ameter MMF
TR AN SMITTER
Opti cal Transmi t Power
D i sabled Power level
Opti cal C enter
Spectral Wi dth
Exti ncti on Rati o
Relati ve Intensi ty Noi se
Total Ji tter [ pk - pk]
Output Ri se, Fall Ti me
R EC EIVER
Opti cal Input
Opti cal Input Power
Opti cal Return Loss
RX_LOS- Asserted
RX_LOS - D easserted
RX_LOS - Hysteresi s
SYMB OL
MIN
500
300
-10
TYP
Note 1 - Measured with 2
7
-1 pseudorandom bit sequence. Measurement taken between TP3-TP4 as shown in Figure 38-1 in
IEEE Draft P802.3z specification.
Note 2 - Host Vcc
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350
2
720
2000
165
0.8
mVpp
ohms
V
V
AC coupled i nputs
Zi n
135
0
150
Ri n > 100 kohms @ D C
Vi H
Vi L
V
DD
T+0.3
Vcc+0.3
0.5
VtoH
VtoL
Vcc-0.5
0
V
Io = 400µA; Note 2
Io = -4.0mA
V
400
750
1600
165
0.5
mVpp
ohms
V
V
AC coupled outputs
Zout
135
0
150
VroH
VroL
TJ
tr,tf
Vcc-0.5
Vcc+0.3
266
lo = 400µA; Note 2
lo = -4.0mA
See Note 1
20% - 80%
ps
V
V
100
2.5
0
350
0.5
ps
VoH
VoL
NC
Wi th Seri al ID
100K
ohms
Measured to RGND /TGND
Surge above steady state value
Ta = 25° C, Vcc = 3.3 V
MAX
U N ITS
N OTES
1000
500
m
m
BER < 1.0E-12 @ 1.25GBaud
BER < 1.0E-12 @ 1.25 GBaud
P opt
Poff
λ
∆λ
ER
RIN
TJ
t
R
, t
F
830
9
850
10
-4
-35
860
0.85
-116
227
260
860
0
dB m
dB m
nm
nm
dB
dB/Hz
ps
ps
average @ 850 nm
TX_D ISABLE acti ve
RMS
P1/P0
20% - 80%
λ
Pr
ORL
Pa
Pd
Pa - Pd
770
-17
12
-30
-20
30
1.5
-17
5.0
nm
dB m
dB
dB m
dB m
dB
BER < 1.0E-12 See Note
measured on transi ti on - low to hi gh
measured on transi ti on - hi gh to low
9245.01
MGBC-20-4-X-XL Optical Gigabit Ethernet - +3.3V
Gigabit Interface Converter (GBIC)
MGBC-20-4-2 PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
®
Ta=25°C, Vcc=3.3V
PARAMETER
FIBER LENGTH
9.0
µ
m Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
SYMBOL
MIN
5
TYP
10
1310
10
MAX
UNITS
km
NOTES
BER < 1.0E-12 @ 1.25 GBaud
Disabled Power level
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - hysteresis
MGBC-20-4-2M PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
PARAMETER
FIBER LENGTH
9.0
µ
m Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
Disabled Power level
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
MGBC-20-4-2L PERFORMANCE SPECIFICATIONS - OPTICAL 1300 nm Laser Single Mode
PARAMETER
FIBER LENGTH
9.0 mm Core Diameter SMF
TRANSMITTER
Optical Center
Extinction Ratio
Y
R
A
N
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M
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L
E
R
P
λ
ER
1270
9
1355
-35
4
-3
nm
dB
P1/P0
RMS
Poff
dB m
nm
TX_DISABLE active
∆λ
P opt
-12
dB m
average @ 1310 nm
Pr
Pa
Pd
Pa-Pd
-20
-30
-3
1.5
-20
5.0
dB m
dB m
dB m
dB
SYMBOL
MIN
10
TYP
20
MAX
UNITS
km
nm
NOTES
BER < 1.0E-12 @ 1.25 GBaud
λ
ER
1285
9
1310
10
1335
-35
3
-3
dB
P1/P0
RMS
Poff
dB m
nm
TX_DISABLE active
∆λ
P opt
-9.5
-20
-30
dB m
average @ 1310 nm
Pr
Pa
Pd
Pa-Pd
-3
1.5
-20
5.0
dB m
dB m
dB m
dB
average power for BER < 1.0E-12
Measured on transition - low to high
Measured on transition - high to low
Ta=25°C, Vcc=3.3V
average power for BER < 1.0E-12
Measured on transition - low to high
Measured on transition - high to low
Ta=25°C, Vcc=3.3V
SYMBOL
MIN
20
TYP
25
MAX
UNITS
km
NOTES
BER < 1.0E-12 @ 1.25 GBaud
λ
ER
1300
9
1310
10
1320
-35
2
nm
dB
P1/P0
RMS
Disabled Power level
RMS Spectral Width
Optical Transmit Power
RECEIVER
Optical Input Power
RX_LOS - Asserted
RX_LOS - Deasserted
RX_LOS - Hysteresis
Poff
∆λ
P opt
Pr
Pa
Pd
Pa-Pd
-7
-22
-30
1.5
dB m
nm
dB m
dB m
dB m
dB m
dB
TX_DISABLE active
average @ 1310 nm
average power for BER < 1.0E-12
Measured on transition - low to high
Measured on transition - high to low
-3
-3
-22
5.0
9245.01
MGBC-20-4-X-XL Optical Gigabit Ethernet - +3.3V
Gigabit Interface Converters (GBIC)
®
TERMINATION CIRCUITS
Inputs to the MGBC-20 transmitter are AC coupled and internally terminated through 75 ohms to AC ground. These
modules can operate with PECL or ECL logic levels. The input signal must have at least a 325mV peak-to-peak (single
ended) signal swing. Output from the receiver section of the module is also AC coupled and is expected to drive into a
75 ohm load. Different termination strategies may be required depending on the particular Serializer/Deserializer chip
set used.
The MGBC-20 product family is designed with AC coupled data inputs and outputs to provide the
following advantages:
n
Close positioning of SERDES with respect to transceiver; allows for shorter line lengths and at
gigabit speeds reduces EMI.
n
Minimum number of external components.
n
Internal termination reduces the potential for unterminated stubs which would otherwise increase
jitter and reduce transmission margin.
Subsequently, this affords the customer the ability to optimally locate the SERDES as close to the MGBC-20 as
possible and save valuable real estate. At gigabit rates this can provide a significant advantage resulting in better
transmission performance and accordingly better signal integrity.
Figure 1 illustrates the recommended transmit and receive data line terminations.
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FIGURE 1: Example of termination circuits for Drivers and Receivers in the host and the GBIC
9245.01
MGBC-20-4-X-XL Optical Gigabit Ethernet - +3.3V
Gigabit Interface Converter (GBIC)
POWER COUPLING
®
A suggested layout for power and ground connections is given in figure 2A below. Connections are made via separate voltage and
ground planes. The mounting posts are at case ground and should not be connected to circuit ground. The ferrite bead should provide
a real impedance of 50 to 100 ohms at 100 to 1000 MHz. Bypass capacitors should be placed as close to the 20 pin connector as
possible.
Figure 2A. Suggested Power Coupling
SIGNAL DESCRIPTION:
TX_FAULT:
Active high signal. A TX_FAULT is defined as the failure of the optical output of the GBIC and it is internally latched. On
the rising edge of the TX_DISABLE, the latched laser fault will be cleared and TX_FAULT will remain deasserted while TX_DISABLE is
asserted. The host shall provide a 4.7K to 10K Ohm pull up resistor to Vcc. The TX_FAULT will also be asserted but not latched if the
Vcc falls below the lower Vcc limit.
TX_DISABLE
:
Active high logic input which disables the optical output. This signal is driven by the host. While asserted, the GBIC
module disables all laser light output. This pin is internally pulled up to Vcc through a 10K Ohm resistor for short wavelength and a
4.7K Ohm resistor for long wavelength. The TX_DISABLE must be pulled low or connected to circuit ground by the host to enable the
GBIC output.
RX_LOS
:
The RX_LOS signal is intended as a preliminary indication to the system in which the GBIC is installed that the link signals
are likely to be outside the required values for proper operation. Such indications typically point to non-installed cables, broken cables,
or a disabled, failing or powered off transmitter at the far end of the cable. Additional indications are provided by the system in which
the GBIC is installed to verify that the information being transmitted is valid, correctly encoded and in the correct format. Such
additional indications are outside the scope of the GBIC specification. RX_LOS will also be asserted if the Vcc falls below the lower
Vcc limit. The host shall provide a 4.7k to 10k Ohm pullup resistor to Vcc.
RGND
Receiver ground. It is internally connected to TGND plane.
TGND
Transmitter ground. It is internally connected to RGND plane.
±RX_DAT
High speed serial differential PECL receiver data.
±TX_DAT
High speed serial differential PECl transmit data.
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BOTTOM VIEW
Figure 2B. Suggested Power Coupling
9245.01
Embedded System
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