19-1701; Rev 2; 2/01
2.125Gbps, 3.3V
Quad-Port Bypass with Repeater
General Description
The MAX3752 quad-port bypass IC is designed for use
in the Fibre Channel Arbitrated Loop topology. This
device consists of four serially connected port bypass
circuits (PBCs) and a repeater that provides clock and
data recovery (CDR).
The quad-port bypass circuit allows connection of up to
four Fibre Channel L-Ports, which can each be enabled
or bypassed by controlling the PBC select inputs.
Additional quad PBCs can be cascaded for applica-
tions requiring more than four L-Ports. To reduce the
external parts count, all signal inputs and outputs have
internal termination resistors.
The MAX3752 complies with Fibre Channel jitter toler-
ance requirements and can recover data signals with up
to 0.7 unit intervals (UIs) of high-frequency jitter. When
the repeater is not needed, it can be disabled to reduce
power consumption. A fully integrated phase-locked loop
(PLL) provides a frequency lock indication and does not
need an external reference clock.
o
Four High-Speed Data Ports
o
Meets Fibre Channel Jitter Tolerance
Requirements
o
Large Output Signal Swing (>1000mVp-p)
o
+3.0V to +3.6V Single-Supply Voltage
o
On-Chip Termination Resistors Compatible with
75Ω Transmission Lines at All Ports
Features
MAX3752
Ordering Information
PART
MAX3752CCM
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
48 TQFP-EP*
________________________Applications
2.125Gbps Fibre Channel
Fibre Channel Data Storage Systems
Storage Area Networks
Fibre Channel Hubs
*EP
= Exposed pad
Pin Configuration
LOUT2+
LOUT2-
GND
LIN2+
LIN2-
GND
GND
LOUT3+
48
47
46
45
44
43
42
41
40
39
38
37
LOUT3-
GND
LIN3+
LIN3-
Typical Operating Circuit appears at end of data sheet.
GND
LIN1-
LIN1+
GND
LOUT1-
LOUT1+
GND
GND
IN-
IN+
GND
CLKEN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
36
35
34
33
32
31
MAX3752
30
29
28
27
26
25
GND
LOUT4+
LOUT4-
GND
LIN4+
LIN4-
GND
GND
OUT-
OUT+
GND
LOCK
V
CC
SEL1
SEL2
SEL3
SEL4
V
CC
TQFP-EP*
* Exposed pad is connected to ground.
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
CDREN
LOCKEN
V
CC
V
CC
CFP
CFM
2.125Gbps, 3.3V
Quad-Port Bypass with Repeater
MAX3752
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..............................................-0.5V to +5.0V
Current into OUT+, OUT-, LOUT1+, LOUT1-, LOUT2+, LOUT2-,
LOUT3+, LOUT3-, LOUT4+, LOUT4- ......................0 to 22mA
Voltage at OUT+, OUT-, LOUT1+, LOUT1-, LOUT2+, LOUT2-,
LOUT3+, LOUT3-, LOUT4+, LOUT4-.......................................
.......................................................(V
CC
- 1.65V) to (V
CC
+ 0.5V)
Voltage at IN+, IN-, LIN1+, LIN1-, LIN2+, LIN2-,LIN3+, LIN3-,
LIN4+, LIN4-. ..........................................-0.5V to (V
CC
+ 0.5V)
Voltage at CLKEN, CFP, CFM, SEL1, SEL2, SEL3, SEL4,
CDREN, LOCKEN.......................................-0.5V to (V
CC
+ 0.5V)
Voltage at LOCK.........................................-0.5V to (V
CC
+ 0.5V)
Current at LOCK .................................................-10mA to +1mA
Continuous Power Dissipation (T
A
= +70°C)
TQFP-EP (derate 27.0mW/°C above +70°C) ......................2W
Operating Junction Temperature Range ...........-55°C to +150°C
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-50°C to +150°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. Typical values are at +3.3V, T
A
= +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
CDR disabled (CLKEN, CDREN, LOCKEN = GND)
Supply Current (Note 1)
CDR enabled (CLKEN, CDREN, LOCKEN = V
CC
)
Input Swing (Differential)
Input Common-Mode Voltage
Output Voltage Swing (Differential) 150Ω load (OUT±, LOUTn±)
Input Resistance (Differential)
Output Resistance (Differential)
TTL Input Voltage (Low)
TTL Input Voltage (High)
TTL Input Current
Lock Output Voltage (Low)
Lock Output Voltage (High)
Voltage at CFP, CFM
0
≤
TTL input voltage
≤
V
CC
IOL = +1mA, LOCKEN = HIGH
IOH = -100µA, LOCKEN = HIGH
2.4
2
-50
0.4
V
CC
-
0.4
V
CC
-
1.03
50
0.7
(IN±, LINn±)
(OUT±, LOUTn±)
1000
132
132
IN±, LINn±
200
V
CC
-
0.45
1400
150
150
1600
181
181
0.8
MIN
TYP
195
193
225
255
353
2200
mVp-p
V
mVp-p
Ω
Ω
V
V
µA
V
V
V
269
mA
MAX
UNITS
2
______________________________________________________________________________________
2.125Gbps, 3.3V
Quad-Port Bypass with Repeater
AC ELECTRICAL CHARACTERISTICS—MAX3752 Operating at 2.125Gbps
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +70°C. Typical values are at +3.3V, C
F
= 0.22µF, T
A
= +25°C, unless otherwise noted.) (Notes 2–7)
PARAMETER
Data Rate
Output Edge Speed
Random Jitter at OUT±
20% to 80%
Pattern = K28.7+, CDR disabled
Pattern = K28.7+, CDR enabled
Pattern = CRPAT, CDR enabled (Note 8)
Pattern = K28.5, CDR disabled
Deterministic Jitter at OUT±
Pattern = K28.5, CDR enabled
Pattern = FC-RPAT, CDR enabled (Note 8, jitter applied)
Total Jitter at OUT±
Jitter Tolerance
(BER = 10
-12
)
Deterministic Jitter Tolerance
Total High-Frequency Jitter
Tolerance
CDR Lock Time
BER = 10
-12
(Note 10)
Pattern = CJTPAT
IN± to OUT± (ports bypassed, CDR enabled)
LINn± to LOUT(n+1)± (port normal mode)
Propagation Delay
SEL(n) rising edge to data valid at LOUT(n+1)± or OUT±
(port normal mode)
SEL(n) falling edge to data valid at LOUT(n+1)± or OUT±
(port bypass mode)
8
8
Pattern = CRPAT, CDR enabled
Pattern = CRPAT, CDR enabled (Note 8, jitter applied)
f = 85kHz sine wave (Notes 8, 9)
f = 1.27MHz sine wave (Notes 8, 9)
f = 10MHz sine wave (Notes 8, 9)
1.5
0.1
0.1
0.38
0.7
4.4
10
2
ns
CONDITIONS
MIN
75
TYP
115
1.5
2.3
3.6
39
27
52
72
100
>4.22
>0.85
>0.47
UI
p-p
UI
p-p
ms
UI
p-p
82
47
80
ps
p-p
ps
p-p
ps
RMS
MAX
160
UNITS
Gbps
ps
MAX3752
2.125
±
100ppm
_______________________________________________________________________________________
3
2.125Gbps, 3.3V
Quad-Port Bypass with Repeater
MAX3752
AC ELECTRICAL CHARACTERISTICS (continued)
Note 1:
Includes output currents.
Note 2:
AC characteristics are guaranteed by design and characterization.
Note 3:
K28.7+ Pattern: 0011 1110 00.
Note 4:
Fibre Channel Random Pattern in hex (FC-RPAT): 3EB0 5C67 85D3 172C A856 D84B B6A6 65.
Note 5:
Compliant Random Pattern in hex (CRPAT):
Pattern Sequence
Repetitions
3E AA 2A AA AA
6
3E AA A6 A5 A9
1
86 BA 6C64 75 D0 E8 DC A8 B4 79 49 EA A6 65
16
72 31 9A 95 AB
1
C1 6A AA 9A A6
1
Note 6:
K28.5 Pattern: 0011 1110 1011 0000 0101.
Note 7:
Compliant Jitter Tolerance Pattern in Hex (CJTPAT):
Pattern Sequence
Repetitions
3E AA 2A AA AA
6
3E AA A6 A5 A9
1
87 1E 38 71 E3
41
87 1E 38 70 BC 78 F4 AA AA AA
1
AA AA AA AA AA
12
AA A1 55 55 E3 87 1E 38 71 E1
1
AB 9C 96 86 E6
1
C1 6A AA 9A A6
1
Note 8:
Parameter measured with 0.38UI deterministic and 0.22UI random jitter (BER = 10
-12
) applied to the input.
Note 9:
Jitter tolerance measurement exceeds the capability of the test equipment used.
Note 10:
Parameter measured with 0.1UI sinusoidal jitter at 10MHz plus 0.38UI deterministic jitter applied to the input.
Typical Operating Characteristics
(T
A
= +25°C and V
CC
= +3.3V, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
275
SUPPLY CURRENT (mA)
250
225
200
175
150
125
100
0
10
20
30
40
50
60
70
200ps/div
100ps/div
TEMPERATURE
°(C)
REPEATER DISABLED
100mV/div
100mV/div
MAX3752/3-01
DATA OUTPUT EYE DIAGRAM
(1.0625Gbps CJTPAT)
MAX3752/3-02
DATA OUTPUT EYE DIAGRAM
(2.125Gbps CJTPAT)
MAX3752/3-03
300
REPEATER ENABLED
4
_______________________________________________________________________________________
2.125Gbps, 3.3V
Quad-Port Bypass with Repeater
Typical Operating Characteristics (continued)
(T
A
= +25°C and V
CC
= +3.3V, unless otherwise noted.)
MAX3752
OUTPUT JITTER—BATHTUB PLOT
MAX3752/3-04
OUTPUT JITTER—BATHTUB PLOT
2Gbps CRPAT
(0.38UI DJ, 0.63UI TJ ON INPUTS)
MAX3752/3-05
1.00E+00
1.00E+02
1.00E+04
BIT ERROR RATE
1.00E+00
1.00E+02
1.00E+04
BIT ERROR RATE
1.00E+06
1.00E+08
1.00E+10
1.00E+12
1.00E+14
2Gbps CRPAT (NO JITTER ON INPUTS)
1.00E+06
1.00E+08
1.00E+10
1.00E+12
1.00E+14
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DATA SAMPLING TIME RELATIVE TO FIRST ZERO
CROSSING (UI)
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DATA SAMPLING TIME RELATIVE TO FIRST ZERO
CROSSING (UI)
INPUT VSWR
vs. FREQUENCY (BY SIMULATION)
MAX3752/3-06
OUTPUT VSWR
vs. FREQUENCY (BY SIMULATION)
MAX3752/3-07
4
4
3
VSWR
VSWR
2
3
2
1
0.1
0.4
0.7
1.0
1.3
1.6
1.9
2.2
2.5
FREQUENCY (GHz)
1
0.1
0.4
0.7
1.0
1.3
1.6
1.9
2.2
2.5
FREQUENCY (GHz)
_______________________________________________________________________________________
5
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