19-1634; Rev 0; 1/00
IT
TION K
VALUA
E
BLE
AVAILA
2.125Gbps/1.063Gbps, 3.3V
Fibre Channel Repeaters
General Description
Features
o
Meet Fibre Channel Jitter Tolerance Requirements
o
3.0V to 3.6V Operation
o
Internally Terminated Data and Clock I/O
o
Reference Clock Not Required
o
Frequency Lock Indication
o
Low Power Consumption
215mW at 3.3V (MAX3770)
190mW at 3.3V (MAX3771)
MAX3770/MAX3771
The MAX3770 is a 2.125Gbps Fibre Channel repeater
IC. The MAX3771 provides a pin-compatible solution
for 1.063Gbps Fibre Channel. Both devices are opti-
mized for use in Fibre Channel arbitrated-loop applica-
tions and operate from a 3.3V supply.
The MAX3770 is compatible with Fibre Channel jitter toler-
ance requirements and can recover data signals with up
to 0.7 unit interval (UI) jitter. The circuit’s fully integrated
phase-locked loop (PLL) provides a frequency lock indi-
cation and does not need an external reference clock.
The MAX3770 provides low-jitter CML clock and data
outputs. To reduce the external parts count, all signal
inputs and outputs are internally terminated. The
MAX3770/MAX3771 are available in 16-pin QSOP
packages.
Pin Configuration
TOP VIEW
________________________Applications
2.125Gbps Fibre Channel
1.063Gbps Fibre Channel
Fibre Channel Storage Systems
Storage Area Networks
Fibre Channel Hubs
FILT+
1
FILT-
2
GND
3
IN+
4
IN-
5
16
LOCK
15
CLK+
14
CLK-
MAX3770
MAX3771
13
CLKEN
12
GND
11
OUT+
10
OUT-
9
LOCKEN
Ordering Information
PART
MAX3770CEE
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
16 QSOP
GND
6
V
CC
7
V
CC
8
MAX3771CEE*
0°C to +70°C
16 QSOP
*Future product—contact factory for availability.
QSOP
Typical Application Circuit
0.22µF
IN+
IN-
V
CC
LOUT+
MAX3750
MAX3751
SEL
LOUT-
LIN-
LIN+
OUT+
OUT-
GND
Z
o
= 75Ω
Z
o
= 75Ω
IN-
IN+
LOCK
V
CC
MAX3770
MAX3771
LOCKEN
CLKEN
FILT+
FILT-
LOUT+
LOUT-
LIN-
LIN+
CLK+
CLK-
OUT+
OUT-
GND
Z
o
= 75Ω
Z
o
= 75Ω
IN+
IN-
V
CC
OUT+
MAX3750
MAX3751
SEL
OUT-
GND
3.3V
0.1µF
3.3V
0.1µF
3.3V
0.1µF
PORT BYPASS CIRCUIT
DATA REPEATER
PORT BYPASS CIRCUIT
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
2.125Gbps/1.063Gbps, 3.3V
Fibre Channel Repeaters
MAX3770/MAX3771
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..............................................-0.5V to +5.0V
Pin Voltage Levels (IN+, IN-, FILT+, FILT-,
LOCKEN, CLKEN, LOCK) ....................-0.5V to (V
CC
+ 0.5V)
LOCK Output Current .........................................-1mA to +10mA
CML Output Currents OUT+, OUT-,
CLK+, CLK-.................................................-22mA to +22mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFP (derate 6.7mW/°C above +70°C)..........533mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-55°C to +150°C
Processing Temperature (die) .........................................+400°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CLKEN = V
CC
Supply Current (Note 1)
CLKEN = GND
Differential Voltage Signal at
OUT or CLOCK
Output Current at OUT or
CLOCK
LOCK Output Low
LOCK Output High
Differential Input Voltage Swing
Input Common-Mode Voltage
Voltage at FILT+, FILT-
CLOCKEN and LOCKEN
Input Current
Differential Input Resistance
Differential Output Resistance
OUT+, OUT-, CLK+, CLK-
-5
132
132
150
150
R
LOAD
= 150Ω, Figure 1
Sum of I
OUT+
and I
OUT-
I
OL
= +1mA
I
OH
= -100µA
2.4
200
V
CC
- 0.45
V
CC
- 1.03
+5
181
181
2200
CONDITIONS
MAX3771
MAX3770
MAX3771
MAX3770
400
MIN
TYP
63
81
57
67.5
780
10.5
0.7
91
1000
mVp-p
mA
V
V
mVp-p
V
V
µA
Ω
Ω
112
mA
MAX
UNITS
Note 1:
Supply current includes output currents.
2
_______________________________________________________________________________________
2.125Gbps/1.063Gbps, 3.3V
Fibre Channel Repeaters
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
OPERATION AT 2.125Gbps
Edge Speed
Random Jitter Generation at
Data Output
Deterministic Jitter Generation
20% to 80%
Input = K28.7+ (Note 2)
T
A
= +25°C
Input = CRPAT (Note 3)
Input = CRPAT (Notes 3, 5)
T
A
= +25°C
T
A
= +25°C (Note 5),
input = CJTPAT (Note 6)
Input = CJTPAT (Note 6)
50
Input = K28.7+ (Note 2)
Random Jitter Generation at
Data Output
Deterministic Jitter Generation
T
A
= +25°C
Input = CRPAT (Note 3)
Input = CRPAT (Notes 3, 5)
T
A
= +25°C
T
A
= +25°C (Note 5),
input = CJTPAT (Note 6),
BER = IE-12
Input = K28.5± (Note 4)
Input = CRPAT (Notes 3, 5)
f = 42.5kHz
f = 635kHz
f = 5MHz
Input = K28.5± (Note 4)
Input = CRPAT (Notes 3, 5)
f = 85kHz (Note 7)
Jitter Tolerance
CDR Lock Time from Start
Propagation Delay
Clock to Q Delay
OPERATION AT 1.063Gbps
3.9
2.3
3.4
17
36
3.1
0.54
0.3
UI
ps
RMS
ps/rms
ps
p-p
ps
p-p
f = 1270kHz (Note 7)
f = 10MHz
1.5
0.1
135
3.4
2.3
3.9
15.6
27
4.22
0.89
0.36
4.4
1000
240
1500
300
ms
ps
ps
UI
170
5.3
3.1
7.3
22
48
ps
p-p
ps
RMS
ps
CONDITIONS
MIN
TYP
MAX UNITS
MAX3770/MAX3771
Jitter Tolerance
Note 2:
K28.7+ pattern: 0011111000
Note 3:
Compliant random pattern (CRPAT) in hex:
Pattern
No. of Occurrences
3EAA2AAAAA
6
3EAAA6A5A9
1
86BA6C6475 D0E8DCA8B4 7949EAA665
16
72319A95AB
1
C16AAA9AA6
1
Note 4:
K28.5± pattern: 00111110101100000101
Note 5:
Random and deterministic jitter generation at 2.125Gbps is measured with 0.38UI deterministic jitter, and 0.22UI random
jitter (BER = 1 x 10
-12
) applied to the input. Random and deterministic jitter generation at 1.063Gbps is measured with
0.18UI deterministic jitter, and 0.08UI random jitter (BER = 1 x 10
-12
) applied to the input.
Jitter tolerance at 2.125Gbps is measured with 0.38UI deterministic jitter and 0.22UI random jitter (BER = 1 x 10
-12
) applied
to the input. Jitter tolerance at 1.063Gbps is measured with 0.18UI deterministic jitter, and 0.08UI jitter (BER = 1 x 10
-12
)
applied to the input.
Note 6:
Compliant jitter tolerance pattern in hex (CJTPAT):
Pattern
No. of Occurrences
3EAA2AAAAA
6
3EAAA6A5A9
1
871E3871E3
41
871E3870BC78F4AAAAAA
1
AAAAAAAAAA
12
AAA15555E3 871E3871E1
1
AB9C9686E6
1
C16AAA9AA6
1
Note 7:
Jitter tolerance measurements at 85kHz and 1270kHz are limited by test equipment. Actual jitter tolerance > indicated.
_______________________________________________________________________________________
3
2.125Gbps/1.063Gbps, 3.3V
Fibre Channel Repeaters
MAX3770/MAX3771
Pin Description
PIN
1
2
3, 6, 12
4
5
7, 8
9
10
11
13
14
15
16
NAME
FILT+
FILT-
GND
IN+
IN-
V
CC
LOCKEN
OUT-
OUT+
CLKEN
CLK-
CLK+
LOCK
FUNCTION
PLL Loop Filter Connection. Connect a 0.22µF capacitor between FILT+ and FILT-.
PLL Loop Filter Connection. Connect a 0.22µF capacitor between FILT+ and FILT-.
Ground
Positive CML Data Input (Figure 3)
Negative CML Data Input (Figure 3)
Supply Voltage
When this input is forced high, the lock indicator is enabled. Ground for normal operation.
Negative 75Ω CML Data Output (Figure 4)
Positive 75Ω CML Data Output (Figure 4)
When this input is forced high, the clock output is enabled. Ground for normal operation.
Negative 75Ω CML Clock Output (Figure 4). Enabled when CLKEN is forced high; disabled when CLKEN
is forced low.
Positive 75Ω CML Clock Output (Figure 4). Enabled when CLKEN is forced high; disabled when CLKEN is
forced low.
Frequency Lock Indicator. High level indicates the PLL is frequency-locked. Disabled when LOCKEN is
forced low. The output of the LOCK pin may chatter when large jitter is applied to the input.
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
MAX3770
JITTER TRANSFER
MAX3770/1 toc01
MAX3770
JITTER TOLERANCE
CJTPAT
V
CC
= 3.3V
C
F
= 0.1µF
MAX3770/1 toc02
MAX3770
RECOVERED DATA AND CLOCK SIGNALS
MAX3770/1 toc03
5
0
JITTER TRANSFER (dB)
-5
-10
-15
-20
-25
1k
10k
100k
1M
10M
100M
CJTPAT
V
CC
= 3.3V
C
F
= 0.1µF
10
SINUSOIDAL INPUT JITTER (UI)
V
CC
= 3.3V
CJTPAT
DATA
1
0.1
FIBRE CHANNEL
SINUSOIDAL
JITTER MASK
CLOCK
VCLK-
100ps/div
0.01
1G
10k
100k
JITTER FREQUENCY (Hz)
ADDITIONAL 0.6UI DJ AND RJ
APPLIED ABOVE 10MHz
1M
10M
100M
JITTER FREQUENCY (Hz)
4
_______________________________________________________________________________________
2.125Gbps/1.063Gbps, 3.3V
Fibre Channel Repeaters
MAX3770/MAX3771
V
OUT
+
200mVp-p MIN
500mVp-p MAX
V
OUT
-
(V
OUT
+) - (V
OUT
-)
400mVp-p MIN
1000mVp-p MAX
Figure 1. Example of Output Signal with R
LOAD
= 150Ω
0.22µF
FILT+
LOCKEN
V
CC
FILT-
LOCK
IN+
150Ω
IN-
LOCK
PHASE/FREQ
DETECTOR
LOOP
FILTER
MAX3770
MAX3771
VCO
TTL
75Ω
75Ω
CLK+
CLK-
CLKEN
V
CC
75Ω
75Ω
OUT+
D LATCH Q
OUT-
Figure 2. Functional Diagram
_______________________________________________________________________________________
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