DS10BR254TSQX/NOPB - NATIONAL SEMICONDUCTOR

DS10BR254

DS10BR254 1.5 Gbps 1:4 LVDS Repeater

Literature Number: SNLS260C

DS10BR254

May 17, 2011

1.5 Gbps 1:4 LVDS Repeater

General Description

The DS10BR254 is a 1.5 Gbps 1:4 LVDS repeater optimized

for high-speed signal routing and distribution over FR-4 print-

ed circuit board backplanes and balanced cables. Fully dif-

ferential signal paths ensure exceptional signal integrity and

noise immunity.

The device has two different LVDS input channels and a se-

lect pin determines which input is active. A loss-of-signal

(LOS) circuit monitors both input channels and a unique

LOS pin is asserted when no signal is detected at that input.

Wide input common mode range allows the switch to accept

signals with LVDS, CML and LVPECL levels; the output levels

are LVDS. A very small package footprint requires a minimal

space on the board while the flow-through pinout allows easy

board layout. Each differential input and output is internally

terminated with a 100Ω resistor to lower device return losses,

reduce component count and further minimize board space.

Features

■DC - 1.5 Gbps low jitter, low skew, low power operation

■Wide Input Common Mode Voltage Range allows for DC-

coupled interface to LVDS, CML and LVPECL drivers

■Redundant inputs

■LOS circuitry detects open inputs fault condition

■Integrated 100Ω input and output terminations

■8 kV ESD on LVDS I/O pins protects adjoining

components

■Small 6 mm x 6 mm LLP-40 space saving package

Applications

■Clock distribution

■Clock and data buffering and muxing

■OC-12 / STM-4

■SD/HD SDI Routers

Typical Application

30007803

DS10BR254 1.5 Gbps 1:4 LVDS Repeater

Ordering Code

NSID Function

DS10BR254TSQ 1:4 Repeater

Block Diagram

30007801

Connection Diagram

30007802

DS10BR254 Pin Diagram

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DS10BR254

Pin Descriptions

Pin Name Pin

Number I/O, Type Pin Description

IN1+, IN1-,

IN2+, IN2-,

4, 5,

6, 7,

I, LVDS Inverting and non-inverting high speed LVDS input pins.

OUT0+, OUT0-,

OUT1+, OUT1-,

OUT2+, OUT2-,

OUT3+, OUT3-

29, 28,

27, 26,

24, 23,

22, 21

O, LVDS Inverting and non-inverting high speed LVDS output pins.

SEL_in 14 I, LVCMOS This pin selects which LVDS input is active.

LOS1,

LOS2

37,

O, LVCMOS Loss Of Signal output pins, LOSn report when an open input fault

condition is detected at the input, INn. These are open drain

outputs. External pull up resistors are required.

PWDN0,

PWDN1,

PWDN2,

PWDN3

35,

33,

I, LVCMOS Channel output power down pin. When the PWDNn is set to L, the

channel output OUTn is in the power down mode.

PWDN 38 I, LVCMOS Device power down pin. When the PWDN is set to L, the device

is in the power down mode.

VDD 3, 8,

15,25, 30

Power Power supply pins.

GND 16, DAP Power Ground pin and a pad (DAP - die attach pad).

NC 1, 2

9, 10,

11, 12,

13, 17,

18, 19,

20, 31,

39, 40

NC NO CONNECT pins. May be left floating.

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DS10BR254

Absolute Maximum Ratings (Note 4)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage −0.3V to +4V

LVCMOS Input Voltage −0.3V to (VCC + 0.3V)

LVCMOS Output Voltage −0.3V to (VCC + 0.3V)

LVDS Input Voltage −0.3V to +4V

Differential Input Voltage |VID| 1V

LVDS Output Voltage −0.3V to (VCC + 0.3V)

LVDS Differential Output Voltage 0.0V to +1V

LVDS Output Short Circuit Current

Duration 5 ms

Junction Temperature +150°C

Storage Temperature Range −65°C to +150°C

Lead Temperature Range

Soldering (4 sec.) +260°C

Maximum Package Power Dissipation at 25°C

SQA Package 4.65W

Derate SQA Package 37.2 mW/°C above +25°C

Package Thermal Resistance

θJA +26.9°C/W

θJC +3.8°C/W

ESD Susceptibility

HBM (Note 1)≥8 kV

MM (Note 2)≥250V

CDM (Note 3)≥1250V

Note 1: Human Body Model, applicable std. JESD22-A114C

Note 2: Machine Model, applicable std. JESD22-A115-A

Note 3: Field Induced Charge Device Model, applicable std.

JESD22-C101-C

Recommended Operating

Conditions

Min Typ Max Units

Supply Voltage (VCC) 3.0 3.3 3.6 V

Receiver Differential Input

Voltage (VID)

0 1 V

Operating Free Air

Temperature (TA)

−40 +25 +85 °C

Electrical Characteristics

Over recommended operating supply and temperature ranges unless otherwise specified. (Note 5, Note 6, Note 7)

Symbol Parameter Conditions Min Typ Max Units

LVCMOS DC SPECIFICATIONS

VIH High Level Input Voltage 2.0 VDD V

VIL Low Level Input Voltage GND 0.8 V

IIH High Level Input Current VIN = 3.6V

VCC = 3.6V

0 ±10 μA

IIL Low Level Input Current VIN = GND

VCC = 3.6V

0 ±10 μA

VCL Input Clamp Voltage ICL = −18 mA, VCC = 0V −0.9 −1.5 V

VOL Low Level Output Voltage IOL= 4 mA 0.26 0.4 V

LVDS INPUT DC SPECIFICATIONS

VID Input Differential Voltage 0 1 V

VTH Differential Input High Threshold VCM = +0.05V or VCC-0.05V 0 +100 mV

VTL Differential Input Low Threshold −100 0 mV

VCMR Common Mode Voltage Range VID = 100 mV 0.05 VCC -

0.05

IIN Input Current VIN = +3.6V or 0V

VCC = 3.6V or 0V

±1 ±10 μA

CIN Input Capacitance Any LVDS Input Pin to GND 1.7 pF

RIN Input Termination Resistor Between IN+ and IN- 100 Ω

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DS10BR254

Symbol Parameter Conditions Min Typ Max Units

LVDS OUTPUT DC SPECIFICATIONS

VOD Differential Output Voltage

RL = 100Ω

250 350 450 mV

ΔVOD Change in Magnitude of VOD for Complimentary

Output States -35 35 mV

VOS Offset Voltage

RL = 100Ω

1.05 1.2 1.375 V

ΔVOS Change in Magnitude of VOS for Complimentary

Output States -35 35 mV

IOS Output Short Circuit Current (Note 8) OUT to GND -35 -55 mA

OUT to VCC 7 55 mA

COUT Output Capacitance Any LVDS Output Pin to GND 1.2 pF

ROUT Output Termination Resistor Between OUT+ and OUT- 100 Ω

SUPPLY CURRENT

ICC Supply Current PWDN = H 113 135 mA

ICCZ Power Down Supply Current PWDN = L 50 60 mA

Note 4: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability

and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in

the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the

device should not be operated beyond such conditions.

Note 5: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified

or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.

Note 6: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD and

ΔVOD.

Note 7: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25°C, and at the Recommended Operation Conditions at the time of

product characterization and are not guaranteed.

Note 8: Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only.

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DS10BR254

AC Electrical Characteristics

Over recommended operating supply and temperature ranges unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

LVDS OUTPUT AC SPECIFICATIONS

tPLHD Differential Propagation Delay Low to

High (Note 11)RL = 100Ω

440 650 ps

tPHLD Differential Propagation Delay High to

Low (Note 11)

400 650 ps

tSKD1 Pulse Skew |tPLHD − tPHLD|

(Note 11, Note 12)

40 100 ps

tSKD2 Channel to Channel Skew

(Note 11, Note 13)

40 125 ps

tSKD3 Part to Part Skew

(Note 11, Note 14)

50 200 ps

tLHT Rise Time (Note 11)RL = 100Ω 150 300 ps

tHLT Fall Time (Note 11) 150 300 ps

tON Any PWDN to Output Active Time 8 20 μs

tOFF Any PWDN to Output Inactive Time 5 12 ns

tSEL Select Time 5 12 ns

JITTER PERFORMANCE (Note 11)

tRJ1 Random Jitter

(RMS Value)

(Note 15)

VID = 350 mV

VCM = 1.2V

Clock (RZ)

135 MHz 0.5 1 ps

tRJ2 311 MHz 0.5 1 ps

tRJ3 503 MHz 0.5 1 ps

tRJ4 750 MHz 0.5 1 ps

tDJ1 Deterministic Jitter

(Peak to Peak Value)

(Note 16)

VID = 350 mV

VCM = 1.2V

K28.5 (NRZ)

270 Mbps 6 22 ps

tDJ2 622 Mbps 6 21 ps

tDJ3 1.0625 Gbps 9 18 ps

tDJ4 1.5 Gbps 9 17 ps

tTJ1

Total Jitter

(Note 17)

VID = 350 mV

VCM = 1.2V

PRBS-23 (NRZ)

270 Mbps 0.01 0.03 UIP-P

tTJ2 622 Mbps 0.01 0.03 UIP-P

tTJ3 1.0625 Gbps 0.01 0.04 UIP-P

tTJ4 1.5 Gbps 0.01 0.06 UIP-P

Note 9: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified

or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.

Note 10: Typical values represent most likely parametric norms for VCC = +3.3V and TA = +25°C, and at the Recommended Operation Conditions at the time of

product characterization and are not guaranteed.

Note 11: Specification is guaranteed by characterization and is not tested in production.

Note 12: tSKD1, |tPLHD − tPHLD|, Pulse Skew, is the magnitude difference in differential propagation delay time between the positive going edge and the negative

going edge of the same channel.

Note 13: tSKD2, Channel to Channel Skew, is the difference in propagation delay (tPLHD or tPHLD) among all output channels in Broadcast mode (any one input to

all outputs).

Note 14: tSKD3, Part to Part Skew, is defined as the difference between the minimum and maximum differential propagation delays. This specification applies to

devices at the same VCC and within 5°C of each other within the operating temperature range.

Note 15: Measured on a clock edge with a histogram and an acummulation of 1500 histogram hits. Input stimulus jitter is subtracted geometrically.

Note 16: Tested with a combination of the 1100000101 (K28.5+ character) and 0011111010 (K28.5- character) patterns. Input stimulus jitter is subtracted

algebraically.

Note 17: Measured on an eye diagram with a histogram and an acummulation of 3500 histogram hits. Input stimulus jitter is subtracted.

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DS10BR254

DC Test Circuits

30007820

FIGURE 1. Differential Driver DC Test Circuit

AC Test Circuits and Timing Diagrams

30007821

FIGURE 2. Differential Driver AC Test Circuit

30007822

FIGURE 3. Propagation Delay Timing Diagram

30007823

FIGURE 4. LVDS Output Transition Times

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DS10BR254

Functional Description

The DS10BR254 is a 1.5 Gbps 1:4 LVDS repeater optimized

for high-speed signal routing and distribution over lossy FR-4

printed circuit board backplanes and balanced cables.

TABLE 1. Input Select Truth Table

CONTROL Pin (SEL_in) State Input Selected

0 IN1

1 IN2

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DS10BR254

Input Interfacing

The DS10BR254 accepts differential signals and allows sim-

ple AC or DC coupling. With a wide common mode range, the

DS10BR254 can be DC-coupled with all common differential

drivers (i.e. LVPECL, LVDS, CML). The following three fig-

ures illustrate typical DC-coupled interface to common differ-

ential drivers. Note that the DS10BR254 inputs are internally

terminated with a 100Ω resistor.

30007831

Typical LVDS Driver DC-Coupled Interface to an DS10BR254 Input

30007832

Typical CML Driver DC-Coupled Interface to an DS10BR254 Input

30007833

Typical LVPECL Driver DC-Coupled Interface to an DS10BR254 Input

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DS10BR254

Output Interfacing

The DS10BR254 outputs signals compliant to the LVDS stan-

dard. Its outputs can be DC-coupled to most common differ-

ential receivers. The following figure illustrates typical DC-

coupled interface to common differential receivers and

assumes that the receivers have high impedance inputs.

While most differential receivers have a common mode input

range that can accomodate LVDS compliant signals, it is rec-

ommended to check respective receiver's data sheet prior to

implementing the suggested interface implementation.

30007834

Typical DS10BR254 Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver

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DS10BR254

Typical Performance

30007863

A 1.5 Gbps NRZ PRBS-7 After 2"

Differential FR-4 Stripline

V:100 mV / DIV, H:100 ps / DIV

30007862

A 1.06 Gbps NRZ PRBS-7 After 2"

Differential FR-4 Stripline

V:100 mV / DIV, H:200 ps / DIV

30007861

A 622 Mbps NRZ PRBS-7 After 2"

Differential FR-4 Stripline

V:100 mV / DIV, H:200 ps / DIV

30007860

A 270 Mbps NRZ PRBS-7 After 2"

Differential FR-4 Stripline

V:100 mV / DIV, H:500 ps / DIV

30007870

Supply Current as a Function of a Number of Outputs Used

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DS10BR254

Physical Dimensions inches (millimeters) unless otherwise noted

Order Number DS10BR254TSQ

NS Package Number SQA40A

(See AN-1187 for PCB Design and Assembly Recommendations)

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DS10BR254

Notes

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DS10BR254

Notes

DS10BR254 1.5 Gbps 1:4 LVDS Repeater

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