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PDF MAX14955 Data sheet ( Hoja de datos )
| Número de pieza | MAX14955 | |
| Descripción | Single-Lane PCIe Gen III Redriver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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
1 page  
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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Equalization, 8dB
VRX-EQ-8dB INEQ_1 = GND, INEQ_0 = VCC (Note 5)
8 dB
Input Equalization, 12dB
VRX-EQ-
12dB
INEQ_1 = VCC, INEQ_0 = GND (Note 5)
12 dB
Input Equalization, 16dB
VRX-EQ-
16dB
INEQ_1 = INEQ_0 = VCC (Note 5)
16 dB
Output Common-Mode Voltage
VTX-CM-AC- MAX(VOUT_P + VOUT_M)/2 - MIN(VOUT_P
PP + VOUT_M)/2
100 mVP-P
Propagation Delay
tPD
120 160 240
ps
Rise/Fall Time
tTX-RISE- (Note 6)
FALL
20 ps
Rise/Fall Time Mismatch
tTX-RF- (Note 6)
MISMATCH
20 ps
Deterministic Jitter
tTX-DJ-DD
K28.5 pattern, AC-coupled, RL = 50I, no
deemphasis, no preshoot, data rate = 8GT/s
7 23.5 psP-P
Random Jitter
tTX-RJ-DD
D10.2 pattern, no deemphasis, no preshoot,
data rate = 8GT/s
0.5 1.5 psRMS
Electrical Idle Entry Delay
tTX-IDLE- From input to output, D10.2 pattern, data
SET-TO-IDLE rate = 1GT/s
Electrical Idle Exit Delay
Electrical Idle Detect Threshold
tTX-IDLE-
TO-DIFF-
DATA
From input to output, D10.2 pattern, data
rate = 1GT/s
VTX-IDLE-
THRESH
D10.2 pattern, data rate = 1GT/s (Note 3)
D10.2 pattern, data rate = 1GT/s to 8GT/s
Output Voltage During Electrical
Idle (AC)
Receiver-Detect Pulse Amplitude
Receiver-Detect Pulse Width
Receiver-Detect Retry Period
CONTROL LOGIC
Input-Logic Level Low
Input-Logic Level High
Input-Logic Hysteresis
Input Pulldown Resistance
ESD PROTECTION
ESD Voltage
VTX-IDLE-
DIFF-AC-P
VTX-RCV-
DETECT
VIL
VIH
VHYST
RPD
|(VOUT_P - VOUT_M)|
Voltage change in positive direction
Human Body Model (HBM)
5 ns
5 ns
50 112 190
mVP-P
112
20 mVP-P
600 mV
100 ns
200 ns
0.6
1.4
0.1
200 375
V
V
V
kΩ
±4 kV
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX14955
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25NC, unless otherwise noted.)
Single-Lane PCIe Gen III Redriver
with Equalization and Extended
Temperature Operation
INEQ0 = INEQ1 = 0, VIN = 200mVP-P,
OEQ0 = 0, OEQ1 = 0, OEQ2 = 1,
DATA RATE = 8GT/s
600
400
200
0
-200
-400
-600
-100
-50 0
50
TIME (ps)
100
INEQ0 = INEQ1 = 0, VIN = 200mVP-P,
OEQ0 = 1, OEQ1 = 1, OEQ2 = 1,
DATA RATE = 8GT/s
800
600
400
200
0
-200
-400
-600
-800
-100
-50 0
50
TIME (ps)
100
INEQ0 = INEQ1 = 0, VIN = 200mVP-P,
OEQ0 = 1, OEQ1 = 0, OEQ2 = 1,
DATA RATE = 8GT/s
600
400
200
0
-200
-400
-600
-100 -50 0 50
TIME (ps)
100
INEQ0 = INEQ1 = 0, VIN = 200mVP-P,
OEQ0 = 0, OEQ1 = 1, OEQ2 = 1,
DATA RATE = 8GT/s
600
400
200
0
-200
-400
-600
-100
-50 0 50
TIME (ps)
100
INEQ0 = 0, INEQ1 = 0, VIN = 500mVP-P,
OEQ0 = OEQ1 = OEQ2 = 0, 6in MICROSTRIP
ON INPUT, DATA RATE = 8GT/s
600
400
200
0
-200
-400
-600
-100 -50 0 50
TIME (ps)
100
INEQ0 = 1, INEQ1 = 0, VIN = 500mVP-P,
OEQ0 = OEQ1 = OEQ2 = 0, 12in MICROSTRIP
ON INPUT, DATA RATE = 8GT/s
600
400
200
0
-200
-400
-600
-100 -50 0 50
TIME (ps)
100
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MAX14955.PDF ] | |
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