MAXIM MAX9123 User Manual

General Description

The MAX9123 quad low-voltage differential signaling (LVDS) differential line driver is ideal for applications requiring high data rates, low power, and low noise. The MAX9123 is guaranteed to transmit data at speeds up to 800Mbps (400MHz) over controlled impedance media of approximately 100Ω. The transmission media may be printed circuit (PC) board traces, backplanes, or cables.

The MAX9123 accepts four LVTTL/LVCMOS input levels and translates them to LVDS output signals. Moreover, the MAX9123 is capable of setting all four outputs to a high-impedance state through two enable inputs, EN and EN, thus dropping the device to an ultra-low-power state of 16mW (typ) during high impedance. The enables are common to all four transmitters. Outputs conform to the ANSI TIA/EIA-644 LVDS standard. Flow-through pinout simplifies PC board layout and reduces crosstalk by separating the LVTTL/LVCMOS inputs and LVDS outputs.

The MAX9123 operates from a single +3.3V supply and is specified for operation from -40°C to +85°C. It is available in 16-pin TSSOP and SO packages. Refer to the MAX9121/ MAX9122* data sheet for quad LVDS line receivers with integrated termination and flow-through pinout.

Applications

Features

♦ Flow-Through Pinout

Simplifies PC Board Layout Reduces Crosstalk

♦ Pin Compatible with DS90LV047A

♦ Guaranteed 800Mbps Data Rate

♦ 250ps Maximum Pulse Skew

♦ Conforms to TIA/EIA-644 LVDS Standard

♦ Single +3.3V Supply

♦ 16-Pin TSSOP and SO Packages

MAX9123

Quad LVDS Line Driver with

Flow-Through Pinout

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

107Ω

MAX9123

MAX9122*

107Ω

LVDS SIGNALS

100Ω SHIELDED TWISTED CABLE OR MICROSTRIP PC BOARD TRACES

LVTTL/CMOS

DATA INPUT

LVTTL/CMOS DATA OUTPUT

Typical Applications Circuit

19-1927; Rev 0; 2/01

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.

* Future product—contact factory for availability.

Digital Copiers

Laser Printers

Cell Phone Base Stations

Add Drop Muxes

Digital Cross-Connects

DSLAMs

Network Switches/Routers

Backplane Interconnect

Clock Distribution

PART TEMP. RANGE PIN-PACKAGE

MAX9123EUE -40°C to +85°C 16 TSSOP

MAX9123ESE -40°C to +85°C 16 SO

TOP VIEW

EN OUT1-

IN1

GND

IN2

IN3

IN4

MAX9123

TSSOP/SO

OUT1+

OUT2+

OUT2-

OUT3-

OUT3+

OUT4+

OUT4-

MAX9123

Quad LVDS Line Driver with Flow-Through Pinout

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, RL= 100Ω ±1%, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted.) (Notes 1, 2)

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.

VCCto GND...........................................................-0.3V to +4.0V

IN_, EN, EN to GND....................................-0.3V to (V

+ 0.3V)

OUT_+, OUT_- to GND..........................................-0.3V to +3.9V

Short-Circuit Duration (OUT_+, OUT_-) .....................Continuous

Continuous Power Dissipation (T

= +70°C)

16-Pin TSSOP (derate 9.4mW/°C above +70°C) .........755mW

16-Pin SO (derate 8.7mW/°C above +70°C)................696mW

Storage Temperature Range .............................-65°C to +150°C

Maximum Junction Temperature .....................................+150°C

Operating Temperature Range ...........................-40°C to +85°C

Lead Temperature (soldering, 10s) .................................+300°C

ESD Protection

Human Body Model, IN_, OUT_+, OUT_-.......................±4kV

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LVDS OUTPUT (OUT_+, OUT_-)

Differential Output Voltage V

Figure 1

368 450 mV

Change in Magnitude of V

Between Complementary Output States

∆V

Figure 1 1 35 mV

Offset Voltage V

Figure 1

Change in Magnitude of V

Between Complementary Output States

∆V

Figure 1 4 25 mV

Output High Voltage V

1.6 V

Output Low Voltage V

Differential Output Short-Circuit Current (Note 3)

OSD

Enabled, VOD = 0 -9 mA

Output Short-Circuit Current I

OUT_+ = 0 at IN_ = VCC or OUT_- = 0 at IN_ = 0, enabled

-9 mA

Output High-Impedance Current

OUT_- = 0 or VCC , RL = ∞

-10 10 µA

Power-Off Output Current I

OFF

VCC = 0 or open, OUT_+ = 0 or 3.6V, OUT_= 0 or 3.6V, R

= ∞

-20 20 µA

INPUTS (IN_, EN, EN)

High-Level Input Voltage V

2.0

Low-Level Input Voltage V

0.8 V

Input Current I

IN_, EN, EN = 0 or V

-20 20 µA

SUPPLY CURRENT

No-Load Supply Current I

RL = ∞, IN_ = VCC or 0 for all channels 9.2 11 mA

Loaded Supply Current I

CCL

RL = 100Ω, IN_ = VCC or 0 for all channels

30 mA

Disabled Supply Current I

CCZ

D i sab l ed , IN _ = V

C C

or 0 for all channel s,

E N = 0, EN = V

4.9 6 mA

250

1.125 1.25 1.375

EN = low and EN = high, OUT_+ = 0 or VCC,

0.90

-3.8

GND

22.7

MAX9123

Quad LVDS Line Driver with

Flow-Through Pinout

_______________________________________________________________________________________ 3

SWITCHING CHARACTERISTICS

(VCC= +3.0V to +3.6V, RL= 100Ω ±1%, CL= 15pF, TA= -40°C to +85°C. Typical values are at VCC= +3.3V, TA= +25°C, unless otherwise noted.) (Notes 4, 5, 6)

Note 1: Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are 100% tested

at T

= +25°C.

Note 2: Currents into the device are positive, and current out of the device is negative. All voltages are referenced to ground except

Note 3: Guaranteed by correlation data. Note 4: AC parameters are guaranteed by design and characterization. Note 5: C

includes probe and jig capacitance.

Note 6: Signal generator conditions for dynamic tests: V

= 0, VOH= 3V, f = 100MHz, 50% duty cycle, RO= 50Ω, tR≤ 1ns, tF≤

1ns (0% to 100%).

Note 7: t

SKD1

is the magnitude difference of differential propagation delay. t

SKD1

= |t

PHLD

- t

PLHD

Note 8: t

SKD2

is the magnitude difference of t

PHLD

or t

PLHD

of one channel to the t

PHLD

or t

PLHD

of another channel on the same

device.

Note 9: t

SKD3

is the magnitude difference of any differential propagation delays between devices at the same VCCand within 5°C

of each other.

Note 10: t

SKD4

is the magnitude difference of any differential propagation delays between devices operating over the rated supply

and temperature ranges.

Note 11: f

MAX

signal generator conditions: VOL= 0, VOH= 3V, f = 400MHz, 50% duty cycle, RO= 50Ω, tR≤ 1ns, tF≤ 1ns (0% to

100%). Transmitter output criteria: duty cycle = 45% to 55%, V

≥ 250mV.

Differential Propagation Delay High to Low

Differential Propagation Delay Low to High

Differential Pulse Skew (Note 7) t

Differential Channel-to-Channel Skew (Note 8)

Differential Part-to-Part Skew (Note 9)

Differential Part-to-Part Skew (Note 10)

Rise Time t

Fall Time t

Disable Time High to Z t

Disable Time Low to Z t

Enable Time Z to High t

Enable Time Z to Low t

Maximum Operating Frequency (Note 11)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

PHLD

PLHD

SKD1

SKD2

SKD3

SKD4

TLH

THL

PHZ

PLZ

PZH

PZL

MAX

Figures 2 and 3 0.7 1.7 ns

Figures 2 and 3 0.04 0.25 ns

Figures 2 and 3 0.07 0.35 ns

Figures 2 and 3 0.13 0.8 ns

Figures 2 and 3

Figures 2 and 3 0.2 0.39 1.0 ns

Figures 4 and 5 2.7 5 ns

Figures 4 and 5 2.3 7 ns

400 MHz

0.43 1.0 ns

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