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MAX4950CTO+T

P1-P3P4-P6P7-P9P10-P10
General Description
The MAX4950 PCI Express (PCIe
®
) quad equalizer/
redriver operates from a single +3.3V supply. This
device improves signal integrity at the receiver through
programmable input equalization and programmable
redrive circuitry. The output circuitry reestablishes de-
emphasis lost on the board, compensating for circuit
board loss. This device permits optimal placement of
key PCIe components and longer runs of stripline,
microstrip, or cable.
The MAX4950 contains four identical buffers capable of
equalizing differential signals at data rates up to 5GT/s,
and features electrical idle and receiver detection on
each channel. The MAX4950 is ideal for use with PCIe
Gen I (2.5GT/s) and Gen II (5.0GT/s) data rates and
features a power-saving mode.
The MAX4950 is available in a small, lead-free, 42-pin
(3.5mm x 9.0mm) TQFN package for optimal layout and
minimal space requirements. The board traces are flow-
through for ease of layout. The MAX4950 is specified
over the 0°C to +70°C operating temperature range.
Applications
Servers
Industrial PCs
Test Equipment
Desktop Computers
Laptop Computers (for External Video Cards)
Communications Switchers
Storage Area Networks
Features
♦ Single +3.3V Supply Operation
♦ Generation I (2.5GT/s) and Generation II (5.0GT/s)
Capable
♦ Return Loss:
≥ 10dB (f ≤ 1.25GHz)
≥ 8dB (f ≤ 2.5GHz)
♦ Very Low Latency
280ps Propagation Delay
♦ Individual Lane Detection
♦ Low Lane-to-Lane Skew: ±50ps
♦ Total Jitter ≤ 35ps
P-P
at BER = 10
-12
♦ Three-Level-Programmable Input Equalization
♦ Three-Level-Programmable Output Deemphasis
♦ On-Chip 50Ω Input/Output Terminations
♦ ±2kV Human Body Model (HBM) Protection on All
Pins
♦ Space-Saving, 3.5mm x 9.0mm, TQFN Packaging
MAX4950
Quad PCI Express Equalizer/Redriver
________________________________________________________________
Maxim Integrated Products
1
19-4439; Rev 0; 5/09
EVALUATION KIT
AVAILABLE
TOP VIEW
MAX4950
TQFN
18
19
20
21
INEQ1
INEQ0
OEQ1
OEQ0
42
+
41
40
39
P_SAV
O_AMP
RX_DET
EN
1234567891011121314151617
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
IN2N
GND
IN3P
IN3N
GND
V
CC
IN2P
GND
V
CC
GND
IN1N
IN1P
GND
IN0N
IN0P
GND
V
CC
OUT2N
GND
OUT3P
OUT3N
GND
V
CC
OUT2P
GND
V
CC
GND
OUT1N
OUT1P
GND
OUT0N
OUT0P
GND
V
CC
*CONNECT EXPOSED PAD (EP) TO GND.
*EP
Pin Configuration
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX4950CTO+ 0°C to +70°C 42 TQFN-EP*
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
PCIe is a registered trademark of PCI-SIG Corp.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
MAX4950
Quad PCI Express Equalizer/Redriver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(Voltages referenced to GND.)
V
CC
........................................................................-0.3V to +4.0V
All Other Pins (Note 1)................................-0.3V to (V
CC
+ 0.3V)
Continuous Current IN_P and IN_N..................................±30mA
Peak Current IN_P and IN_N (pulsed for 1µs,
1% duty cycle)............................................................±100mA
Continuous Power Dissipation (T
A
= +70°C)
42-Pin TQFN (derate 34.5mW/°C above +70°C) .......2759mW
Junction-to-Case Thermal Resistance (θ
JC
) (Note 2)
42-Pin TQFN................................................................2.0°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 2)
42-Pin TQFN..............................................................29.0°C/W
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, C
CL
= 75nF coupling capacitor on each output, R
L
= 50Ω resistor on each output, T
A
= 0°C to +70°C, unless
otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC PERFORMANCE
Power-Supply Range V
CC
3.0 3.6 V
EN = V
CC
262 328
Supply Current I
CC
O_AMP = GND,
P _S AV = G N D ( N ote 4)
EN = GND 100 125
mA
Differential Input Impedance Z
RX-DIFF-DC
DC 80 100 120 Ω
Differential Output
Impedance
Z
TX-DIFF-DC
DC 80 100 120 Ω
Common-Mode Resistance
to GND
Z
RX-HIGH-IMP-
DC-POS
V
IN_P
= V
IN_N
= 0 to +200mV, input
terminations not powered
50 kΩ
Common-Mode Resistance
to GND
Z
RX-HIGH-IMP-
DC-NEG
V
IN_P
= V
IN_N
= -150mV to 0, input terminations
not powered
1kΩ
Common-Mode Resistance
to GND, Input Terminations
Powered
Z
RX-DC
DC 40 50 60 Ω
Output Short-Circuit Current I
TX-SHORT
Single-ended 90 mA
Common-Mode Delta
Between Active and Idle
States
V
TX-CM-DC-
ACTIVE-IDLE-
DELTA
O_AMP = GND 100 mV
DC Output Offset During
Active State
V
TX-CM-DC-
LINE-DELTA
|(V
OUT_P
+ V
OUT_N
)| 25 mV
DC Output Offset During
Electrical Idle
V
TX-IDLE-DIFF-
DC
|(V
OUT_P
+ V
OUT_N
)| 10 mV
AC PERFORMANCE (Note 5)
f = 0.05GHz to 1.25GHz 10
Differential Input Return Loss RL
RX-DIFF
f = 1.25GHz to 2.5GHz 8
dB
Common-Mode Input Return
Loss
RL
RX-CM
f = 0.05GHz to 2.5GHz 6 dB
Note 1: All I/O pins are clamped by internal diodes.
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
MAX4950
Quad PCI Express Equalizer/Redriver
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
f = 0.05GHz to 1.25GHz 10
Differential Output Return
Loss
RL
TX-DIFF
f = 1.25GHz to 2.5GHz 8
dB
Common-Mode Output
Return Loss
RL
TX-CM
f = 0.05GHz to 2.5GHz 6 dB
Redriver Operation
Differential Input Signal
Range
V
RX-DIFF-PP
f = 0.05GHz to 2.5GHz 120 1200 mV
P-P
Full-Swing Differential Output
Voltage (No Deemphasis)
V
TX-DIFF-PP
2 x |(V
OUT_P
+ V
OUT_N
)|, O_AMP = GND;
f = 500MHz
800 1000 1200 mV
P-P
D i ffer enti al Outp ut V ol tag e
( Low S w i ng , N o D eem p hasi s)
V
TX-DIFF-PP-
LOW
2 x |(V
OUT_P
+ V
OUT_N
)|, O_AMP = V
CC
;
f = 500MHz
600 750 900 mV
P-P
Output Deemphasis Ratio,
0dB
V
TX-DE-RATIO-
0dB
f = 2.5GHz, OEQ1 = GND, OEQ0 = GND;
see Table 3
0dB
Output Deemphasis Ratio,
3.5dB
V
TX-DE-RATIO-
3.5dB
f = 2.5GHz, OEQ1 = GND, OEQ0 = V
CC
;
see Table 3
3.5 dB
Output Deemphasis Ratio,
6dB
V
TX-DE-RATIO-
6dB
f = 2.5G H z, O E Q 1 = V
C C
, O E Q 0 = V
C C
or G N D ;
see Tab l e 3
6dB
Input Equalization, 0dB V
RX-EQ-0dB
f = 2.5GHz, INEQ1 = GND, INEQ0 = GND;
see Table 2 (Note 6)
0dB
Input Equalization, 3.5dB V
RX-EQ-3.5dB
f = 2.5GHz, INEQ1 = GND, INEQ0 = V
CC
;
see Table 2 (Note 6)
3.5 dB
Input Equalization, 6dB V
RX-EQ-6dB
f = 2.5GH z, IN E Q1 = V
C C
, IN E Q0 = V
C C
or GN D ;
see Tab l e 2 (Note 6)
6dB
Output Common-Mode
Voltage Swing Peak-to-Peak
V
TX-CM-AC-PP
Max(V
OUT_P
+ V
OUT_N
)/2 – Min(V
OUT_P
+
V
OUT_N
)/2
100 mV
P-P
Propagation Delay T
PD
f = 2.5GHz, K28.7 pattern 160 280 400 ps
Rise/Fall Time T
TX-RISE-FALL
(Note 7) 30 ps
Rise/Fall Time Mismatch
T
TX-RF-
MISMATCH
(Note 7) 20 ps
Output Skew Same Pair T
SK
f = 2.5GHz 10 15 ps
Output Skew Lane to Lane T
SKL
f = 2.5GHz -50 50 ps
Deterministic Jitter T
TX-DJ-DD
K28.5 p atter n, 5.0G T/s, AC - coup l ed , R
L
= 50Ω ,
effects of deemphasis deembedded
15 ps
P-P
Random Jitter T
TX-RJ-DD
K28.7 pattern, f > 1.5MHz, BER = 10
-12
1.4 ps
RMS
Electrical Idle Entry Delay
T
TX-IDLE-SET-
TO-IDLE
From input to output 15 ns
Electrical Idle Exit Delay
T
TX-IDLE-TO-
DIFF-DATA
From input to output 8 ns
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, C
CL
= 75nF coupling capacitor on each output, R
L
= 50Ω resistor on each output, T
A
= 0°C to +70°C, unless
otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 3)
P1-P3P4-P6P7-P9P10-P10

MAX4950CTO+T

Mfr. #:
Buy MAX4950CTO+T
Manufacturer:
Maxim Integrated
Description:
Interface - Signal Buffers, Repeaters Quad PCI Express Equalizer/Re-Driver
Lifecycle:
New from this manufacturer.
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