Datasheet

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MAX14954

Ruggedized Quad PCIe Redriver with

Equalization and Extended Temperature Operation

General Description

The MAX14954 is a quad equalizer/redriver designed to

improve PCI Express® (PCIe) signal integrity by providing

programmable input equalization at its receiver and pro-

grammable redrive circuitry. The output circuitry reestab-

lishes deemphasis lost on the board and compensates for

circuit-board loss. The device permits optimal placement

of key PCIe components. The device is useful with strip-

line, microstrip printed circuits, and balanced 100Ω cable.

The device is tailored for PCIe and features electrical idle

and receiver detection on each channel. It is optimized for

PCIe Gen III (8.0GT/s) and Gen II (5.0GT/s) data rates,

while still handling Gen I (2.5GT/s).

The MAX14954 is available in a small, lead-free, 42-pin

(3.5mm x 9.0mm) TQFN package for optimal layout and

minimal space requirements. The device is specified over

-40NC to +85NC extended operating temperature range.

Applications

● Industrial/Embedded PCs

● Computer on Modules

● Carrier Boards

● Test Equipment

● Rack Server Industrial PCs

● Medical Equipment

Benets 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: 0.5ps

RMS

(typ)

• Deterministic Jitter: 10.5ps

P-P

(typ)

• Equalization Permits Placement Up to 30in FR4

● Robust Solution for Harsh Environments

• Industrial Temperature Rated: -40°C to + 85°C

• ±5kV Human Body Model (HBM) Protection on

All Pins

• Housed in a Flow-Through (3.5mm x 9.5mm)

TQFN Package for Resistance to Vibration/

Shocks

19-6531; Rev 0; 11/12

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX14954.related.

PCI Express is a registered trademark of PCI-SIG Corp.

EVALUATION KIT AVAILABLE

Summary of content (17 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX14954 Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation General Description The MAX14954 is a quad equalizer/redriver designed to improve PCI Express® (PCIe) signal integrity by providing programmable input equalization at its receiver and programmable redrive circuitry. The output circuitry reestablishes deemphasis lost on the board and compensates for circuit-board loss. The device permits optimal placement of key PCIe components.
PAGE 2
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Absolute Maximum Ratings (Voltages referenced to GND.) VCC...........................................................................-0.3V to +4V All Other Pins (Note 1).............................. -0.3V to (VCC + 0.3V) Continuous Current IN_P/IN_N.........................................±30mA Peak Current IN_P/IN_N (pulsed for 1µs, 1% duty cycle)...................................
PAGE 3
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 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.
PAGE 4
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 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.
PAGE 5
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 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.
PAGE 6
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 VLOW_P-P VHIGH_P-P DE(dB) = 20 log VHIGH_P- P VLOW_P-P Figure 1. Illustration of Output Deemphasis Typical Operating Characteristics (TA = +25°C, unless otherwise noted.
PAGE 7
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 8
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 9
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 10
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 11
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 12
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.
PAGE 13
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Pin Configuration VCC GND OUT3N OUT3P GND OUT2N OUT2P GND VCC GND OUT1N OUT1P GND OUT0N OUT0P GND VCC TOP VIEW 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 OEQ0 *EP 20 OEQ1 MAX14954 OEQ2 41 I.C.
PAGE 14
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Pin Description (continued) PIN NAME 35 OUT0N Inverting Output, Channel 0 FUNCTION 36 OUT0P Noninverting Output, Channel 0 39 EN Enable Input. Drive EN low for standby mode. Drive EN high for normal mode. EN has a 250kΩ (typ) internal pulldown resistor. 40 RXDET Receiver Detection Control Bit. Drive RXDET high to initiate receiver detection. Drive RXDET low for normal mode.
PAGE 15
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Detailed Description Receiver Detection The MAX14954 quad equalizer/redriver is designed to support Gen III (8.0GT/s), Gen II (5.0GT/s), and Gen I (2.5GT/s) PCIe data rates. The device contains four identical drivers with electrical idle/receive detect on each lane and equalization/deemphasis/preshoot to compensate for circuit-board loss.
PAGE 16
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 MAIN BOARD REMOTE BOARD MIDPLANE Tx MAX14954 Rx 4 DIFFERENTIAL PAIRS PCIe PCIe Rx MAX14954 Tx 4 DIFFERENTIAL PAIRS CONNECTORS Figure 2. Typical Application Diagram Applications Information Figure 2 shows a typical application with two MAX14954s, both residing on the main board with input and output equalization set individually for optimal performance.
PAGE 17
Ruggedized Quad PCIe Redriver with Equalization and Extended Temperature Operation MAX14954 Revision History REVISION NUMBER REVISION DATE 0 11/12 DESCRIPTION Initial release PAGES CHANGED — For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product.