ST STLVDS31B User Manual

Features

■ Meets or exceeds the requirements of ANSI

TIA/EIA-644 standard

■ Low voltage differential signaling with typical

output voltage of 350 mV and a 100 Ω load

■ Typical output voltage rise and fall times of

750 ps (400 Mbps)

■ Typical propagation delay times of 1.7 ns

■ Operates from a single 3.3 V supply

■ Power dissipation 25 mW typical per driver at

200 MHz

■ Driver at high impedance when disabled or with

V

= 0 V

CC

■ Pin compatible with the AM26LS31,

SN65LVDS31

■ Low voltage TTL (LVTTL) logic input levels

STLVDS31B

High speed differential line drivers

TSSOP16

transmission media may be printed circuit board
traces, backplanes or cables. The ultimate rate
and distance of data transfer is dependent upon
the attenuation characteristics of the media and
noise coupling to the environment.

Description

The STLVDS31B is a quad differential line drivers
that implements the electrical characteristics of
low voltage differential signaling (LVDS). This
signaling technique lowers the output voltage
levels of 5 V differential standard levels (such as
TIA/EIA-422B) to reduce the power, increase the
switching speeds and allows operations with a

3.3 V supply rail. Any of the four current mode
drivers will deliver a minimum differential output
voltage magnitude of 247 mV into a 100 Ω load
when enabled.

The intended application of this device and
signalling technique is for point-to-point baseband
data transmission over controlled
impedancemedia approximately 100 Ω. The

Table 1. Device summary

Order code Temperature range Package Packaging

STLVDS31BTR - 40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel

The STLVDS31B is characterized for operation
from - 55 °C to 125 °C.

July 2009 Doc ID 8338 Rev 6 1/15

www.st.com

15

Contents STLVDS31B

Contents

1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2/15 Doc ID 8338 Rev 6

STLVDS31B Pin configuration

1 Pin configuration

Figure 1. Pin connections and functional diagram

Table 2. Pin description

Pin n° Symbol Name and function

1, 7, 9, 15 1A to 4A Driver inputs

2, 6, 10, 14 1Y to 4Y Driver outputs

3, 5, 11, 13 1Z to 4Z Driver outputs

4 G Enable

12 G Enable

8 GND Ground

16 V

CC

Supply voltage

Doc ID 8338 Rev 6 3/15

Pin configuration STLVDS31B

Figure 2. Logic diagram and logic symbol

Table 3. Truth table for receiver

- 100 mV < V

Table 4. Truth table

Input Enables Outputs

AGG

HHXHL

LHXLH

HXLHL

LXLLH

XLHZZ

OPEN H X L H

OPEN X L L H

VID = VA - V

V

≥ 100 mV H

ID

≤ −100 mV L

V

ID

B

< 100 mV ?

ID

OPEN H

YZ

R

L = Low level, H = High Level, X = Don’t care, Z = High Impedance

4/15 Doc ID 8338 Rev 6

STLVDS31B Maximum ratings

2 Maximum ratings

Table 5. Absolute maximum ratings

Symbol Parameter Value Unit

(1)

-0.5 to 4.6 V

T

V

STG

V

CC

I

Supply voltage

DC input voltage -0.5 to (VCC + 0.5) V

Storage temperature range -65 to +150 °C

1. All voltages except differential I/O bus voltage, are with respect to the network ground terminal.

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these condition is not implied.

Table 6. Recommended operating conditions

Symbol Parameter Min. Typ. Max. Unit

V

CC

V

IH

V

ILI

T

A

Supply voltage 3.0 3.3 3.6 V

HIGH level input voltage 2.0 V

LOW level input voltage 0.8 V

Operating temperature range -40 85 °C

Doc ID 8338 Rev 6 5/15

Electrical characteristics STLVDS31B

3 Electrical characteristics

Over recommended operating conditions unless otherwise noted. All typical values are at
T

= 25 °C, and VCC = 3.3 V.

A

Table 7. Electrical characteristics

Symbol Parameter Test condition Min. Typ. Max. Unit

ΔV

ΔV

V

V

V

OD

OD

OC(SS)

OC(SS)

OC(PP)

I

CC

I

IH

I

IL

I

SC

I

OZ

I

CS

I

OFF

C

IN

Differential output voltage

Change in differential output
voltage between logic state

R

= 100Ω, Figure 2

L

247 350 454 mV

-50 50 mV

Change in steady-state
common mode output voltage

Figure 3 1.125 1.2 1.375 V

between logic state

Steady-state common mode
output voltage

Peak to peak common mode
output voltage

Supply current

Figure 3 -50 50 mV

80 150 mV

= 0.8V or 2V, Enabled, No Load 11.5 20 mA

V

IN

V

= 0.8V or 2V, Enabled, RL = 100Ω 25 35 mA

IN

= 0 or VCC, Disabled 0.3 1 mA

V

IN

High level input current VIH = 2V 4 20 µA

Low level input current VIL = 0.8V 0.6 10 µA

Short circuit output current

or V

O(Y)

= 0 ± 12 mA

V

OD

= 0V 6.1 - 24 mA

O(Z)

V

High impedance output current VO = 0 or 2.4V ± 1µA

Cold spare leakage current VI = 3.6V, VDD = 0V ± 20 µA

Power OFF output current VCC = 0, VO = 2.4V ± 1µA

Input capacitance 3 pF

6/15 Doc ID 8338 Rev 6

STLVDS31B Electrical characteristics

Over recommended operating conditions unless otherwise noted. All typical values are at
T

= 25 °C, and VCC = 3.3 V.

A

Table 8. Switching characteristics

Symbol Parameter Test condition Min. Typ. Max. Unit

(1)

t

PLH

t

PHL

t

sk(P)

t

sk(O)

t

PZH

t

PZL

t

PHZ

t

PLZ

Propagation delay time, low to high
output

Propagation delay time, high to low
output

Differential output signal rise time 0.4 0.5 0.6 ns

t

r

t

Differential output signal fall time 0.4 0.5 0.6 ns

f

Pulse skew (|t

Channel to channel output skew

THL

= t

|) 0.3 0.6 ns

TLH

(2)

Propagation delay time, high
impedance to high level output

Propagation delay time, high
impedance to low level output

Propagation delay time, high level
to high impedance output

Propagation delay time, low level
to high impedance output

1. RS-232 IN to TTL-CMOS OUT (from 50 % to 50 %).

2. t

is the maximum delay time difference between drivers on the same device.

sk(O)

R

= 100Ω, CL = 10pF

L

Figure 2

Figure 4

0.5 1.4 2 ns

11.72.5ns

00.3ns

5.4 15 ns

2.5 15 ns

8.1 15 ns

7.3 15 ns

Doc ID 8338 Rev 6 7/15

Typical characteristics STLVDS31B

4 Typical characteristics

Figure 3. Voltage and current definitions

Figure 4. Test circuit, timing and voltage definitions for differential output signal

1. All input pulse are supplied by a generator having the following characteristics: tr or tf ≤ 1 ns, pulse
repetition rate (PRR) = 50 Mpps, pulse width = 10 ± 0.2 ns.

includes instrumentation and fixture capacitance within 6 mm. of the D.U.T.

2. C

L

Figure 5. Test circuit and definitions for the driver common mode output voltage

1. All input pulse are supplied by a generator having the following characteristics: tr or tf ≤ 1 ns, pulse
repetition rate (PRR) = 50 Mpps, pulse width = 10 ± 0.2 ns.

includes instrumentation and fixture capacitance within 6mm of the D.U.T

2. C

L

3. The measurement of V

is made on test equipment with a -3 dB bandwidth of at least 300 MHz.

OC(PP)

8/15 Doc ID 8338 Rev 6

STLVDS31B Typical characteristics

Figure 6. Enable and disable time test circuit and waveform

1. All input pulse are supplied by a generator having the following characteristics: tr or tf ≤ 1 ns, pulse
repetition rate (PRR) = 0.5 Mpps, pulse width = 500 ± 10 ms.

includes instrumentation and fixture capacitance within 6 mm. of the D.U.T.

2. C

L

Doc ID 8338 Rev 6 9/15

Typical performance characteristics STLVDS31B

5 Typical performance characteristics

Unless otherwise specified TJ = 25 °C

Figure 7. Supply current vs. temperature Figure 8. Supply current vs. temperature

Figure 9. Propagation delay enable to output Figure 10. Propagation delay time

Figure 11. Differential output signal

10/15 Doc ID 8338 Rev 6

STLVDS31B Package mechanical data

6 Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK

®

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

Doc ID 8338 Rev 6 11/15

Package mechanical data STLVDS31B

TSSOP16 mechanical data

mm. inch.

Dim.

Min. Typ. Max. Min. Typ. Max.

A 1.2 0.047

A1 0.05 0.15 0.002 0.004 0.006

A2 0.8 1 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.012

c0.09 0.20 0.004 0.0079

D4.9 5 5.1 0.193 0.197 0.201

E 6.2 6.4 6.6 0.244 0.252 0.260

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0° 8°0° 8°

L 0.45 0.60 0.75 0.018 0.024 0.030

A2

A

A1

b

e

c

K

L

E

D

E1

PIN 1 IDENTIFICATION

1

12/15 Doc ID 8338 Rev 6

0080338D

STLVDS31B Package mechanical data

Tape & reel TSSOP16 mechanical data

mm. inch.

Dim.

Min. Typ. Max. Min. Typ. Max.

A 330 12.992

C 12.8 13.2 0.504 0.519

D 20.2 0.795

N60 2.362

T 22.4 0.882

Ao 6.7 6.9 0.264 0.272

Bo 5.3 5.5 0.209 0.217

Ko 1.6 1.8 0.063 0.071

Po 3.9 4.1 0.153 0.161

P7.98.1 0.311 0.319

Doc ID 8338 Rev 6 13/15

Revision history STLVDS31B

7 Revision history

Table 9. Document revision history

Date Revision Changes

28-Mar-2006 5 Order codes updated.

15-Jul-2009 6 Modified: Features on page 1.

14/15 Doc ID 8338 Rev 6

STLVDS31B

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Doc ID 8338 Rev 6 15/15