MAXIM MAX9157 User Manual

General Description

The MAX9157 is a quad bus LVDS (BLVDS) transceiver
for heavily loaded, half-duplex multipoint buses. Small
32-pin QFN and TQFP packages and flow-through
pinouts allow the transceiver to be placed near the con­nector for the shortest possible stub length. The
MAX9157 drives LVDS levels into a 27Ω load (double
terminated, heavily loaded LVDS bus) at up to
200Mbps. An input fail-safe circuit ensures the receiver
output is high when the differential inputs are open, or
undriven and shorted, or undriven and terminated. The
MAX9157 differential inputs feature 52mV hysteresis for
greater immunity to bus noise and reflections. The
MAX9157 operates from a single 3.3V supply, consum­ing 80.9mA supply current with drivers enabled, and

22.7mA with drivers disabled.

The MAX9157’s high-impedance I/Os (except for
receiver outputs) when VCC= 0 or open, combined
with glitch-free power-up and power-down, allow hot
swapping of cards in multicard bus systems; 7.2pF
(max) BLVDS I/O capacitances minimize bus loading.

The MAX9157 is offered in 5mm ✕ 5mm 32-pin QFN and
TQFP packages. The MAX9157 is fully specified for the

-40°C to +85°C extended temperature range. Refer to
the MAX9129 data sheet for a quad BLVDS driver, ideal
for dual multipoint full-duplex buses.

Applications

Features

♦ 32-TQFP and Space-Saving 32-QFN Packages

♦ 52mV LVDS Input Hysteresis

♦ 1ns (min) Transition Time (0% to 100%) Minimizes

Reflections

♦ Guaranteed 7.2pF (max) Bus Load Capacitance

♦ Glitch-Free Power-Up and Power-Down

♦ Hot-Swappable, High-Impedance I/O with V

CC

= 0

or Open

♦ Guaranteed 200Mbps Driver Data Rate

♦ Fail-Safe Circuit

♦ Flow-Through Pinout

MAX9157

Quad Bus LVDS Transceiver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

CARD 1 CARD 15 CARD 16

1in CARD
SPACING

Rt = 54Ω Rt = 54Ω

MAX9157

MAX9157

MAX9157

Typical Operating Circuit

19-2287; Rev 0; 1/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Pin Configurations appear at end of data sheet.

Functional Diagram appears at end of data sheet.

Add/Drop Muxes

Digital Cross-Connects

Network
Switches/Routers

Cellular Phone Base
Stations

DSLAMs

Multipoint Buses

PART TEMP RANGE PIN-PACKAGE

MAX9157EGJ -40°C to +85°C 32 QFN (5mm
MAX9157EHJ -40°C to +85°C 32 TQFP (5mm ✕ 5mm)

✕ 5mm)

MAX9157

Quad Bus LVDS Transceiver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 3.6V, RL= 27Ω ±1%, differential input voltage |VID| = 0.1V to VCC, input common-mode voltage VCM= 0.05V to 2.4V,
input voltage range = 0 to V

CC

, DE_ = high, RE_ = low, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC=

3.3V, |V

ID

| = 0.2V, VCM= 1.2V, and TA= +25°C.) (Notes 1 and 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.

VCC, AVCCto GND................................................-0.3V to +4.0V

DO_+/RIN_+, DO_-/RIN_-, to GND .......................-0.3V to +4.0V

DIN_, DE_, RE_ to GND.........................................-0.3V to +4.0V

RO_ to GND................................................-0.3V to (V

CC

+ 0.3V)

AGND to GND .......................................................-0.3V to +0.3V

Short-Circuit Duration (DO_+/RIN_+, DO_-/RIN_-) ....Continuous

Continuous Power Dissipation (T

A

= +70°C)

MAX9157EGJ (derate 21.2mW/°C above +70°C) .....1702mW

MAX9157EHJ (derate 11.1mW/°C above +70°C).........889mW

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

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

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

ESD Protection

Human Body Model (DO_+/RIN_+, DO_-/RIN_-).............±4kV

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BLVDS (DO_+/RIN_+, DO_-/RIN_-)

Differential Input High Threshold V

Differential Input Low Threshold V

Threshold Hysteresis (Note 3) V

Input Current I

Input Resistance

Power-Off Input Current

Differential Output Voltage V

Change in Magnitude of VOD for
Complementary Output States

Offset Voltage V

Change in Magnitude of VOS for
Complementary Output States

Output High Voltage V

Output Low Voltage V

Output Short-Circuit Current I

DE_ = low 26 100 mV

TH

DE_ = low -100 -26 mV

TL

HYST

IN+

R

R

I

INO+

I

INO- 0.6V < V

OD

∆V

OS

∆V

OH

DE_ = low

0.1V ≤VID≤ 0.6V, DE_ = low -15 ±1.8 15 µA

, I

IN-

0.6V < VID≤ 1.2V, DE_ = low -20 ±2.5 20 µA

V

IN1

IN2

,

= 3.6V, 0 or open, Figure 1 53 kΩ

CC

V

= 3.6V, 0 or open, Figure 1 148 kΩ

CC

0.1V ≤ VID≤ 0.6V, V
≤ 1.2V, V

ID

Figure 2 250 405 460 mV

Figure 2 1 25 mV

OD

Figure 2 1.185 1.302 1.435 V

Figure 2 3.3 25 mV

OS

Figure 2 1.505 1.6 V

Figure 2 0.9 1.099 V

OL

DIN_ = high, DO_+/RIN_+ = 0 or
V

, DO_-/RIN_- = 0 or V

OS

CC

DIN_ = low, DO_-/RIN_- = 0 or
V

, DO_+/RIN_+ = 0 or V

CC

TA = +25°C, VCC = 3.3V,

= 1.2V

V

CM

12 26 43

Full operating range 9 26 78

= 0 or open -15 ±0.9 15 µA

CC

= 0 or open -20 ±1.8 20 µA

CC

CC

CC

-30 -14.8 30

-30 -14.8 30

mV

mA

MAX9157

Quad Bus LVDS Transceiver

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.0V to 3.6V, RL= 27Ω ±1%, differential input voltage |VID| = 0.1V to VCC, input common-mode voltage VCM= 0.05V to 2.4V,
input voltage range = 0 to V

CC

, DE_ = high, RE_ = low, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC=

3.3V, |V

ID

| = 0.2V, VCM= 1.2V, and TA= +25°C.) (Notes 1 and 2)

_

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Differential Output Short-Circuit
Current (Note 3)

Capacitance at Bus Pins
(Note 3)

LVCMOS/LVTTL OUTPUTS (RO_)

Output High Voltage V

Output Low Voltage V

Dynamic Output Current I

Output Short-Circuit Current
(Note 4)

Output High-Impedance Current I

Capacitance at Receiver Output
(Note 3)

LVCMOS/LVTTL INPUTS (DIN, DE, RE)

Input High Voltage V

Input Low Voltage V

Input Current I

Power-Off Input Current I

SUPPLY

Supply Current Drivers and
Receivers Enabled

Supply Current Drivers Enabled
and Receivers Disabled

Supply Current Drivers Disabled
and Receivers Enabled

Supply Current Drivers Disabled
and Receivers Disabled

I

OSD

C

OUTPUT

OD

I

OS

OZ

C

OUTPUT

INO

I

CC

I

CCD

I

CCR

I

CCZ

OH

OL

IN

DIN_ = high or low, VOD = 0 14.8 30 mA

Capacitance from DO_+/RIN_+ or
DO_-/RIN_- to GND, V

IOH = -4.0mA,
DE_ = low

= 3.6V or 0

CC

Open, undriven short, or
undriven 27Ω parallel
termination

VID = 100mV

-

CC

VCC -

0.172

-

VCC -

0.172

V

0.3

V

CC

0.3

IOL = 4.0mA, VID = -100mV, DE_ = low 0.179 0.25 V

VID = 100mV, V

VID = -100mV, V

VID = 100mV, V

RE_ = high, V

= VCC - 1.0V, DE_ = low -15 -22.7 mA

RO

= 1.0V, DE_ = low 12 19.9 mA

RO_

= 0, DE_ = low -52 -130 mA

RO_

RO

= 0 or V

CC

-10 0.1 +10 µA

Capacitance from RO_ to GND, VCC = 3.6V
or 0

IH

IL

V

, V

, V

DE

RE_

_

V

, V

DE

RE_

_

= high or low -20 ±9.2 20 µA

DIN_

, V

DIN_

= 3.6V or 0, V

CC

= 0

or open

2.0 1.825 V

GND 1.315 0.8 V

-20 ±2.4 20 µA

DE_ = high, RE_ = low, RL = 27Ω 80.9 95 mA

DE_ = high, RE_ = high, RL = 27Ω 80.9 95 mA

DE_ = low, RE_ = low 22.7 30 mA

DE_ = low, RE_ = high 22.7 30 mA

7.2 pF

4.5 pF

CC

V

V

MAX9157

Quad Bus LVDS Transceiver

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 3.6V, RL= 27Ω ±1%, differential input voltage |VID| = 0.2V to VCC, input frequency to LVDS inputs = 85MHz, input fre­quency to LVCMOS/LVTTL inputs = 100MHz, LVCMOS/LVTTL inputs = 0 to 3V with 2ns (10% to 90%) transition times. Differential input
voltage transition time = 1ns (20% to 80%). Input common-mode voltage V

CM

= 1.2V to 1.8V, DE_ = high, RE_ = low, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at V

CC

= 3.3V, |VID| = 0.2V, VCM= 1.2V, and TA= +25°C.) (Notes 3 and 5)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DRIVER

Differential Propagation Delay
High to Low

Differential Propagation Delay
Low to High

Differential Skew | t

PHLD

- t

PLHD

(Note 6)

Channel-to-Channel Skew
(Note 7)

Chip-to-Chip Skew (Note 8) t

Chip-to-Chip Skew (Note 9) T

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 10)

t

PHLD

t

PLHD

|

t

SKD1

t

CCSK

SKD2

SKD3

TLH

THL

PHZ

PLZ

PZH

PZL

f

MAX

RE_ = high, CL = 10pF,
Figures 3, 4

RE_ = high, CL = 10pF,
Figures 3, 4

RE_ = high, CL = 10pF, Figures 3, 4 33 160 ps

RE_ = high, CL = 10pF, Figures 3, 4 58 300 ps

RE_ = high, CL = 10pF, Figures 3, 4 0.38 0.8 ns

RE_ = high, CL = 10pF, Figures 3, 4 1.3 ns

RE_ = high, CL = 10pF,
Figures 3, 4

RE_ = high, CL = 10pF,
Figures 3, 4

RE_ = high, CL = 10pF,
Figures 5, 6

RE_ = high, CL = 10pF,
Figures 5, 6

RE_ = high, CL = 10pF,
Figures 5, 6

RE_ = high, CL = 10pF,
Figures 5, 6

RE_ = high, CL = 10pF, Figures 5, 6 100 MHz

RECEIVER

Differential Propagation Delay
High to Low

Differential Propagation Delay
Low to High

Differential Skew | t

| (Note 6)

t

PLHD

PHLD

-

Channel-to-Channel Skew
(Note 7)

Chip-to-Chip Skew (Note 8) t

Chip-to-Chip Skew (Note 9) t

Rise Time t

t

PHLD

t

PLHD

t

SKD1

t

CCSK

SKD2

SKD3

TLH

DE_ = low, Figures 7, 8;
C

=15pF

L

DE_ = low, Figures 7, 8;

=15pF

C

L

DE_ = low, Figures 7, 8; C

DE_ = low, Figures 7, 8; C

DE_ = low, Figures 7, 8; CL =15pF 0.7 1.7 ns

DE_ = low, Figures 7, 8; CL =15pF 0.7 1.7 ns

DE_ = low, Figures 7, 8; C

MAX9157EGJ 1.2 1.96 2.5

MAX9157EHJ 1.1 1.87 2.4

MAX9157EGJ 1.2 1.94 2.5

MAX9157EHJ 1.1 1.84 2.4

MAX9157EGJ 0.6 1.13 1.4

MAX9157EHJ 0.6 1.07 1.4

MAX9157EGJ 0.6 1.16 1.4

MAX9157EHJ 0.6 1.11 1.4

MAX9157EGJ 6.79 8

MAX9157EHJ 6.79 8

MAX9157EGJ 3.16 8

MAX9157EHJ 3.48 8

MAX9157EGJ 4.67 7

MAX9157EHJ 4.71 7

MAX9157EGJ 4.36 7

MAX9157EHJ 4.39 7

MAX9157EGJ 1.8 2.58 4.1

MAX9157EHJ 1.8 2.61 4.1

MAX9157EGJ 1.8 2.49 4.1

MAX9157EHJ 1.8 2.52 4.1

= 15pF 90 450 ps

L

= 15pF 131 580 ps

L

= 15pF 0.5 1.1 1.6 ns

L

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

MAX9157

Quad Bus LVDS Transceiver

_______________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS (continued)

(VCC= 3.0V to 3.6V, RL= 27Ω ±1%, differential input voltage |VID| = 0.2V to VCC, input frequency to LVDS inputs = 85MHz, input fre­quency to LVCMOS/LVTTL inputs = 100MHz, LVCMOS/LVTTL inputs = 0 to 3V with 2ns (10% to 90%) transition times. Differential input
voltage transition time = 1ns (20% to 80%). Input common-mode voltage V

CM

= 1.2V to 1.8V, DE_ = high, RE_ = low, TA= -40°C to

+85°C, unless otherwise noted. Typical values are at V

CC

= 3.3V, |VID| = 0.2V, VCM= 1.2V, and TA= +25°C.) (Notes 3 and 5)

Note 1: Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground

except V

TH

, VTL, VID, V

HYST

, VOD, and ∆VOD.

Note 2: Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are production

tested at T

A

= +25°C.

Note 3: Guaranteed by design and characterization.
Note 4: Short only one output at a time. Do not exceed the absolute maximum junction temperature specification.
Note 5: C

L

includes scope probe and test jig capacitance.

Note 6: t

SKD1

is the magnitude difference of differential propagation delays in a channel. t

SKD1

= | t

PHLD

- t

PLHD

|.

Note 7: t

CCSK

is the magnitude difference of the t

PLHD

or t

PHLD

of one channel and the t

PLHD

or t

PHLD

of any other channel on the

same part.

Note 8: t

SKD2

is the magnitude difference of any differential propagation delays between parts operating over rated conditions at

the same V

CC

and within 5°C of each other.

Note 9: t

SKD3

is the magnitude difference of any differential propagation delays between parts operating over rated conditions.

Note 10: Meets data sheet specifications while operating at minimum f

MAX

rating.

Typical Operating Characteristics

(VCC= 3.3V, RL= 27Ω, driver CL= 10pF, receiver CL= 15pF, |VID| = 200mV, VCM= 1.2V, fIN= 20MHz, TA= +25°C, unless otherwise noted.)

75

85

80

95

90

100

105

0.01 1000

SUPPLY CURRENT vs. FREQUENCY

MAX9157 toc01

FREQUENCY (MHz)

SUPPLY CURRENT (mA)

10.1 10 100

FOUR CHANNELS
DRIVEN

VCC = 3.6V

VCC = 3.3V

VCC = 3.0V

0.400

0.401

0.403

0.402

0.404

0.405

3.0 3.23.1 3.3 3.4 3.5 3.6

DIFFERENTIAL OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

MAX9157 toc02

SUPPLY VOLTAGE (V)

DIFFERENTIAL OUTPUT VOLTAGE (V)

0

0.6

0.4

0.2

0.8

1.0

1.2

1.4

1.6

1.8

2.0

15 45 75 105 135

DIFFERENTIAL OUTPUT VOLTAGE

vs. OUTPUT LOAD

MAX9157 toc03

OUTPUT LOAD (Ω)

DIFFERENTIAL OUTPUT VOLTAGE (V)

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 10)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

THL

PHZ

PLZ

PZH

PZL

f

MAX

DE_ = low, Figures 7, 8; C

DE_ = low, RL = 500Ω, C
= 15pF, Figures 9, 10

DE_ = low, RL = 500Ω, C
= 15pF, Figures 9, 10

DE_ = low, RL = 500Ω, C
= 15pF, Figures 9, 10

DE_ = low, RL = 500Ω, C
= 15pF, Figures 9, 10

DE_ = low, CL = 15pF 85 MHz

= 15pF 0.7 1.2 1.8 ns

L

MAX9157EGJ 6.74 8

L

MAX9157EHJ 6.82 8

MAX9157EGJ 6.49 8

L

MAX9157EHJ 6.79 8

MAX9157EGJ 4.67 7

L

MAX9157EHJ 4.57 7

MAX9157EGJ 5.43 7

L

MAX9157EHJ 4.71 7

ns

ns

ns

ns