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MAX14955 Datasheet Download - Maxim Integrated

Номер произв MAX14955
Описание Single-Lane PCIe Gen III Redriver
Производители Maxim Integrated
логотип Maxim Integrated логотип 



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MAX14955 Даташит, Описание, Даташиты
MAX14955
Single-Lane PCIe Gen III Redriver
with Equalization and Extended
Temperature Operation
General Description
The MAX14955 dual equalizer/redriver improves PCI
Express® (PCIe) signal integrity by providing program-
mable input equalization. This feature reduces deter-
ministic jitter and redrives circuitry to reestablish deem-
phasis, which compensates for circuit-board loss at high
frequencies. The device permits optimal placement of key
PCIe components and allows for longer runs of stripline,
microstrip, or cable.
The device contains two identical channels capable of
equalizing PCIe Gen III (8GT/s), Gen II (5GT/s), and
Gen I (2.5GT/s) signals and features electrical idle and
receiver detection.
The MAX14955 is available in a small, 40-pin, 5.0mm x
5.0mm TQFN package with flow-through traces for opti-
mal layout and minimal space requirements. The device
is specified over the -40°C to +85°C extending operating
temperature range.
Applications
● Industrial/Embedded PCs
● Computer on Modules
● Carrier Boards
● Test Equipment
● Rack Server Industrial PCs
● Medical Equipment
Typical Operating Circuit
Benefits and Features
Fully Integrated for Ease of Use and Design Flexibility
Optimized for PCIe Gen III (8.0GT/s), Gen II
(5.0GT/s), Gen I (2.5 GT/s) Compatible
• Four Levels of Input Equalization up to 16dB
• Eight Levels of Output Deemphasis up to 9dB
High Level of Performance to Overcome Noise in
Lossy Channels
• Random Jitter: 0.5psRMS (typ)
• Deterministic Jitter: 7psP-P (typ)
• Equalization Permits Placement Up to 30in FR4
● Robust Solution for Harsh Environments
• Industrial Temperature Rated: -40°C to +85°C
• ±4kV Human Body Model (HBM) Protection on All
Pins
Housed in a Flow-Through (5mm x 5mm) TQFN
Package for Resistance to Vibration/Shocks
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX14955.related.
MAIN BOARD
Tx
PCIe
Rx
MAX14955
MIDPLANE
SINGLE DIFFERENTIAL PAIR
SINGLE DIFFERENTIAL PAIR
REMOTE BOARD
Rx
PCIe
Tx
CONNECTORS
PCI Express is a registered service mark of PCI-SIG Corporation.
19-6640; Rev 0; 3/13







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MAX14955 Даташит, Описание, Даташиты
MAX14955
Single-Lane PCIe Gen III Redriver
with Equalization and Extended
Temperature Operation
Absolute Maximum Ratings
(Voltages referenced to GND.)
VCC........................................................................-0.3V to +4.0V
All Other Pins (Note 1).............................. -0.3V to (VCC + 0.3V)
Continuous Current IN_P, IN_M,
OUT_P, OUT_M............................................................±30mA
Peak Current IN_P, IN_M, OUT_P, OUT_M
(pulsed for 1µs, 1% duty cycle)...................................±100mA
Continuous Power Dissipation (TA = +70°C)
TQFN (derate 35.7mW/°C above +70°C)..................2857mW
Operating Temperature Range............................ -40°C to +85°C
Junction Temperature Range............................ -40°C to +150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Note 1: All I/O pins are clamped by internal diodes.
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.
Package Thermal Characteristics (Note 2)
TQFN
Junction-to-Ambient Thermal Resistance (BJA).......... 28NC/W
Junction-to-Case Thermal Resistance (BJC)..................2NC/W
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.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VCC = +3.0V to +3.6V, CCL = 200nF coupling capacitor on each output, RL = 50Ω on each output, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 3)
PARAMETER
DC PERFORMANCE
Power-Supply Range
SYMBOL
VCC
CONDITIONS
MIN TYP MAX UNITS
OEQ_2 = OEQ_1 = OEQ_0
= GND
3.0 3.3 3.6
102 135
V
Supply Current
OEQ_2 = OEQ_1 = GND,
OEQ_0 = VCC
OEQ_2 = OEQ_0 = GND,
OEQ_1 = VCC
OEQ_2 = GND, OEQ_1 =
ICC
EN = VCC
OEQ_0 = VCC
OEQ_2 = VCC, OEQ_1 =
OEQ_0 = GND
106 140
107 140
125 160
106 140
mA
OEQ_2 = OEQ_0 = VCC,
OEQ_1 = GND
132 170
OEQ_2 = OEQ_1 = VCC,
OEQ_0 = GND
140 180
OEQ_2 = OEQ_1 = OEQ_0
= VCC
165 210
www.maximintegrated.com
Maxim Integrated 2







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MAX14955 Даташит, Описание, Даташиты
MAX14955
Single-Lane PCIe Gen III Redriver
with Equalization and Extended
Temperature Operation
Electrical Characteristics (continued)
(VCC = +3.0V to +3.6V, CCL = 200nF coupling capacitor on each output, RL = 50Ω on each output, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 3)
PARAMETER
Standby Current
Differential Input Impedance
Differential Output Impedance
Common-Mode Resistance to
GND, Input Termination Not
Powered
SYMBOL
ISTBY EN = GND
ZRX-DIFF-
DC
ZTX-DIFF-
DC
DC
DC
CONDITIONS
OEQ_2 = OEQ_1 = OEQ_0
= GND
OEQ_2 = OEQ_1 = GND,
OEQ_0 = VCC
OEQ_2 = OEQ_0 = GND,
OEQ_1 = VCC
OEQ_2 = GND, OEQ_1 =
OEQ_0 = VCC
OEQ_2 = VCC, OEQ_1 =
OEQ_0 = GND
OEQ_2 = OEQ_0 = VCC,
OEQ_1 = GND
OEQ_2 = OEQ_1 = VCC,
OEQ_0 = GND
OEQ_2 = OEQ_1 = OEQ_0
= VCC
ZRX-HIGH-
IMP-DC
-150mV ≤ VIN_CM ≤ +200mV
MIN TYP MAX UNITS
57 80
61 85
62 85
75 100
mA
62 80
85 110
92 120
120 150
80 100 120
Ω
80 100 120
Ω
50
Common-Mode Resistance to
GND, Input Termination Powered
ZRX-DC
20 25 30
Ω
Output Short-Circuit Current
Common-Mode Delta, Between
Active and Idle States
DC Output Offset, During Active
State
DC Output Offset, During
Electrical Idle
ITX-SHORT Single-ended (Note 4)
VTX-CM-DC-
ACTIVE-IDLE-
DELTA
VTX-
ACTIVE-
DIFF-DC
|(VOUT_P - VOUT_M)|
VTX-IDLE-
DIFF-DC
|(VOUT_P - VOUT_M)|
90 mA
100 mV
65 mV
65 mV
www.maximintegrated.com
Maxim Integrated 3










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