Texas Instruments SN75LBC771DW, SN75LBC771DWR, SN75LBC771NS Datasheet

SN75LBC771

GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Supports a 9-Pin GeoPort Host Interface
Standard for the Intelligent Network Port

D

Designed to Operate up to 4-Mbit/s Full
Duplex

D

±5 V Supply Operation

D

Provides 6 kV ESD Protection

D

Has Driver Short-Circuit Protection

D

Includes Failsafe Mechanism for Open
Inputs

D

Is Backward Compatible with AppleTalk
and LocalTalk

D

Combines Multiple Components into a
Single Chip Solution

D

Complements the SN75LBC772 9-Pin
GeoPort Peripheral (DCE) Interface Device

D

Uses LinBiCMOS Process Technology

description

The SN75LBC771 is a low-power LinBiCMOS
device that incorporates the drivers and receivers
for a 9-pin GeoPort host interface. GeoPort
combines hybrid EIA/TIA-422-B and EIA/
TIA-423-B drivers and receivers to transmit data
up to four-Mbit/s full duplex. GeoPort is a serial
communications standard that is intended to
replace the RS-232, AppleTalk, and printer ports
all in one connector in addition to providing
real-time data transfer capability. The
SN75LBC771 provides point-to-point connec­tions between GeoPort-compatible devices with
data transmission rates up to 4-Mbit/s full duplex
featuring a hot-plug capability. Applications
include connection to telephone, ISDN, digital
sound and imaging, fax-data modems, and other
traditional serial and parallel connections. The
GeoPort is backwardly compatible to both
LocalTalkand AppleTalk.

While the SN75LBC771 is powered off (V

CC

and VEE = 0), the outputs are in a high-impedance state. Also, when
the shutdown (SHDN) terminal is high, all outputs go into a high-impedance state. A logic high on the driver
enable (DEN

) terminal places the outputs of the differential driver into a high-impedance state. All drivers and

receivers have fail-safe mechanisms that ensure a high output state when the inputs are left open.
The SN75LBC771 is characterized for operation over the 0°C to 70°C temperature range.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

DA1

V

EE

NC
NC

SHDN

DZ2
DY2

GND

DEN

DA2

GND
V

CC

DY1
RY3
RB3
RA2
RY2
RB1
RA1
RY1

DW PACKAGE

(TOP VIEW)

DY2
DZ2

RY1

DY1

RY2

RY3

DA2

DEN

RB1

RA1

DA1

RA2

RB3

SHDN

10

9

12
13

11

1

14

5

18

15

16

17

7
6

logic diagram (positive logic)

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Copyright  1997, Texas Instruments Incorporated

GeoPort, LocalTalk, and AppleTalk are trademarks of Apple Computer, Incorporated.
LinBICMOS is a trademark of Texas Instruments Incorporated.

SN75LBC771
GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLES

†

SINGLE-ENDED DRIVER

DIFFERENTIAL DRIVER

INPUT

(DA1)

ENABLE

(SHDN)

OUTPUT

(DY1

)

INPUT

(DA2)

(SHDN) (DEN)

ENABLE

(DY2) (DZ2)

OUTPUT

H
L

OPEN

X
X

L
L
L
H

OPEN

L
H
L
Z
Z

H
L

OPEN

X
X

L
L
L
H

OPEN

L
L
L
X
X

H
L
H
Z
Z

L
H
L
Z
Z

XXXXH

OPENZZ

Z

Z

SINGLED-ENDED RECEIVER DIFFERENTIAL RECEIVER

INPUT

(RA2, RA3)

ENABLE

(SHDN)

OUTPUT

(RY2) (RY3)

INPUT

(RA1) (RB1)

ENABLE

(SHDN)

OUTPUT

(RY1)

H L H L H L L H
L L L H L HL L

OPEN L H H OPEN L H

SHORT

‡

L ? ? SHORT

‡

L ?
X H Z Z X XH Z
XOPEN Z Z X X OPEN Z

†

H = high level, L = low level, X = irrelevant, ? = indeterminate, Z = high impedance (off)

‡

–0.2 V < VID < 0.2 V

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

§

Positive supply voltage

range, V

CC

(see Note 1) –0.5 to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Negative supply voltage range, V

EE

(see Note 1) –7 to 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver input voltage range (RA, RB) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver differential input voltage range, V

ID

–12 V to 12 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver output voltage range (RY) –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver output voltage range (Power Off) (DY1

, DY2, DZ2) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver output voltage range (Power On) (DY1

, DY2, DZ2) –11 V to 11 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver input voltage range (DA, SHDN, DEN

) –0.5 V to V

CC

+0.4 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrostatic Discharge (see Note 2)

(All pins) Class 3, A 6 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(All pins) Class 3, B 500 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

A

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

§

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 under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values are with respect to network ground terminal unless otherwise noted.

2. This rating is per MIL-STD-883C, Method 3015.7.

SN75LBC771

GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

DW 1125 mW 9.0 mW/°C 720 mW

recommended operating conditions

MIN NOM MAX UNIT

Positive supply voltage, V

CC

4.75 5 5.25 V

Negative supply voltage, V

EE

–5.25 –5 –4.75 V

High-level input voltage, V

IH

(DA, SHDN, DEN) 2 V

Low-level input voltage, V

IL

(DA, SHDN, DEN) 0.8 V

Receiver common-mode input voltage, V

IC

–7 7 V

Receiver differential input voltage, V

ID

–12 12 V

Operating free-air temperature, T

A

0 70 °C

driver electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

p

RL= 12 kΩ 3.6 4.5 V

VOHHigh-level output voltage

Single-ended,

RL= 120 Ω 2 3.6 V

p

g,

See Figure 1

RL= 12 kΩ –4.5 –3.6 V

VOLLow-level output voltage

RL = 120 Ω –3.6 –2 V

|VOD|

Magnitude of differential output voltage
|VDY – VDZ|

R

= 120 Ω, See Figure 2

4 V

∆|VOD| Change in differential voltage magnitude

L

,

g

250 mV

V

OC

Common-mode output voltage –2 2 V

|∆V

OC(SS)

|

Magnitude of change, common-mode
steady-state output voltage

See Figure 3

200 mV

|∆V

OC(PP)

|

Magnitude of change, common-mode
peak-to-peak output voltage

700 mV

I

CC

Positive supply current

4 10 mA

I

EE

Negative supply current

SHDN

=

DEN

= 0 V,

No Load

–2 –5 mA

I

CC

Positive supply current

100 µA

I

EE

Negative supply current

SHDN

=

DEN

= 5 V,

No Load

–100 µA

I

OZ

High-impedance output current VCC = 0 or 5 V, –10 ≤ VO ≤ 10 V ±100 µA

I

OS

Short-circuit output current

VCC = 5.25 V ,
See Note 3

–5 V ≤ VO ≤ 5 V,

±170 ±450 mA

NOTE 3: Not more than one output should be shorted at one time.

SN75LBC771
GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

driver switching characteristics over operating free-air temperature range

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

t

PHL

Propagation delay time, high-to-low level output 42 75 ns

t

PLH

Propagation delay time, low-to-high level output 41 75 ns

t

PZL

Driver output enable time to low-level output 25 100 µs

t

PZH

Driver output enable time to high-level output

Single ended,

25 100 µs

t

PLZ

Driver output disable time from low-level output

SHDN

g,

See Figure 4

28 100 ns

t

PHZ

Driver output disable time from high-level output 37 100 ns

t

r

Rise time 10 25 75 ns

t

f

Fall time 10 23 75 ns

t

PHL

Propagation delay time, high-to-low level output 40 75 ns

t

PLH

Propagation delay time, low-to-high level output 42 75 ns

p

p

SHDN 25 100 µs

t

PZL

Driver output enable time to low-level output

DEN 29 150 ns

p

p

SHDN 25 100 µs

t

PZH

Driver output enable time to high-level output

DEN

Differential,

35 150 ns

p

p

SHDN

,

See Figure 5

28 100 ns

t

PLZ

Driver output disable time from low-level output

DEN 34 100 ns

p

p

SHDN 37 100 ns

t

PHZ

Driver output disable time from high-level output

DEN 34 100 ns

t

r

Rise time 10 27 75 ns

t

f

Fall time 10 26 75 ns

t

SK(p)

Pulse skew, |t

PLH

– t

PHL

| 22 ns

SN75LBC771

GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

receiver electrical characteristics over recommended operating conditions (unless otherwise
noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

V

IT+

Positive-going input threshold voltage 200 mV

V

IT–

Negative-going input threshold voltage

See Figure 6

–200 mV

V

hys

Differential input voltage hysteresis (V

IT+

– V

IT–

) 50 mV

V

OH

High-level output voltage (see Note 4)

VIC = 0,
See Figure 6

IOH = –2 mA,

2 4.5 V

V

OL

Low-level output voltage

VIC = 0,
See Figure 6

IOL = 2 mA,

0.4 0.8 V

p

VO = 0 –45 –85 mA

IOSShort-circuit output current

VO = 5.25 V 45 85 mA

R

IN

Input resistance VCC = 0 or 5.25 V, –12 V ≤ VI ≤ 12 V 6 30 kΩ

NOTE 4: If the inputs are left unconnected, receivers one and two interpret this as a high-level input and receiver three interprets this as a low-level

input so that all outputs are at the high level.

receiver switching characteristics over recommended conditions (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

t

PHL

Propagation delay time, high-to-low level output 30 75 ns

t

PLH

Propagation delay time, low-to-high level output

30 75 ns

t

r

Rise time

RL = 2 kΩ,

CL = 15 pF,

15 30 ns

t

f

Fall time

See Figure 6

15 30 ns

t

SK(P)

Pulse skew |t

PLH-tPHL

| 20 ns

t

PZL

Receiver output enable time to low-level output 35 100 ns

t

PZH

Receiver output enable time to high-level output 35 100 ns

t

PLZ

Receiver output disable time from low-level
output

Differential

20 100 ns

t

PHZ

Receiver output disable time from high-level
output

p

20 100 ns

t

PZL

Receiver output enable time to low-level output

C

L

= 50 pF,

See Figure 7

12 25 ns

t

PZH

Receiver output enable time to high-level output 12 25 µs

t

PLZ

Receiver output disable time from low-level
output

Single-ended

25 100 µs

t

PHZ

Receiver output disable time from high-level
output

125 400 ns

SN75LBC771
GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

V

I

I

I

I

O

DY1

V

O

C

L

R

L

DA1

SHDN

V

I

V

O

V

O

C

L

C

L

R

L

R

L

DY2

I

O

I

O

DZ2

I

I

SHDN

or

DEN

DA2

NOTE A: CL = 50 pF

Figure 1. Single-Ended Driver DC Parameter Test Circuits

V

I

V

OD

DY2

DZ2

I

I

DA2

60 Ω

60 Ω

50 pF

I

O

SHDN

or

DEN

Figure 2. Differential Driver DC Parameter Test Circuit

V

I

V

OD

DY2

DZ2

DA2

60 Ω

60 Ω

15 pF

TEST CIRCUIT

V

OC

1.5 v

1.5 v

V

OC(PP)

V

OC(SS)

3 V

0 V

0 V

V

I

V

OC

VOLTAGE WAVEFORM

SHDN

or

DEN

NOTE A: Measured 3dB Bandwidth = 300 MHz

Figure 3. Differential Driver Common-Mode Output Voltage Test Circuit

SN75LBC771

GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

DY1

V

O

CL = 50 pF

RL = 120 Ω

DA1

SHDN

V

I

V

O

V

O

C

L

C

L

R

L

R

L

DY2

I

O

I

O

DZ2

I

I

DA2

TEST CIRCUIT

(see Note A)

SHDN

or

DEN

t

PHL

t

PHL

t

PLZ

t

PZL

t

PLH

t

PHZ

1.5 V 1.5 V 1.5 V 1.5 V

1.5 V 1.5 V

3 V

0 V

3 V

0 V

DA

DY2

V

OH

V

OL

0 V

t

PZL

t

r

t

f

90% 90%

10%

90%

90%

10% 10% 10%

V

OH

V

OL

0 V

VOLTAGE WAVEFORM

(see Note B)

50%

50%

DY1

, DZ2

SHDN

or

DEN

90%

10%

50%

90%

10%

50%

90%

90%

10%

t

PZH

t

PLH

t

f

t

PHZ

10%

t

PZH

t

r

t

PLZ

NOTES: A. CL = 50 pF, RL = 120 Ω

B. The input waveform tr, tf ≤ 10 ns.

Figure 4. Single-Ended Driver Propagation and Transition Times Test Circuits and Waveform

SN75LBC771
GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

TEST CIRCUIT

t

PLH

t

PHZ

t

PZH

t

PHL

t

PLZ

t

PZL

t

r

t

f

1.5 V 1.5 V 1.5 V 1.5 V

1.5 V 1.5 V

90% 90%

10%

90%

90%

10% 10% 10%

3 V

0 V

3 V

0 V

V

OD(H)

V

OD(L)

0 V

SHDN

or

DEN

DA

V

OD

VOLTAGE WAVEFORM

(see Note A)

V

I

V

OD

DY2

DZ2

SHDN

or

DEN

DA2

RL = 60 Ω

50 pF

RL = 60 Ω

50%

50%

NOTE A: For the input waveform tr, tf < = 10 ns

Figure 5. Differential Driver Propagation and Transition Times Test Circuit and Waveforms

_

+

V

I

I

I

I

O

V

O

V

CC

2 kΩ

15 pF

RY

RA
RB

Input

SHDN

Output

t

r

t

f

t

PLH

t

PHL

0 V 0 V

2.5 V

–2.5 V

V

OH

1.5 V
V

OL

90% 90%

10% 10%

V

I

V

O

TEST CIRCUIT VOLTAGE WAVEFORM

(see Note A)

NOTE A: For the input waveform tr, tf < = 10 ns

Figure 6. Receiver Propagation and Transition Times Test Circuit and Waveform

SN75LBC771

GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

_

+

CL = 50 pF

RY

RA
RB

–2.5 V or 2.5 V

SHDN

t

PLZ

t

PZL

1.5 V

3 V

0 V

V

CC

V

OL

10%

90%

SHDN

V

O

TEST CIRCUIT

VOLTAGE WAVEFORM

(see Note A)

RL = 500 Ω

V

CC

10%

90%

1.5 V

t

PHZ

t

PZH

S1 at V

CC

S1 at GND

V

OH

0 V

S1

NOTE A: For the input waveform tr, tf < = 10 ns

Figure 7. Receiver Enable and Disable Test Circuit and Waveforms

SN75LBC771
GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

10

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

GeoPort

Peripheral

Device

9-Pin

DCE

GeoPort

Host

SN75LBC771

9-Pin

DTE

678

34 95

12

13
12
7

6

18
15

16

RxD–
RxD+

TxD+
TxD–

GND

RESET/ATT

SCLK

Power

TxHS/WAKE-UP

GeoPort

Controller

and USART

†

11

10

5

1
14
17

9

RxD

TxD

SHDN

DTR

RTXC

CTS
RTS

Standard

Host

SN75LBC771

9-Pin

DTE

13

12

7
6

18

15

16 TxHS/WAKE-UP

Power

V

CC

GND

RxD–

RxD+

TxD+
TxD–

RESET/ATT

SCLK

V

CC

19

2

8

20

RESET/ATT
SCLK

TxHS/WAKE-UP

V

EE

†

USART = universal synchronous asynchronous receiver transmitter

Figure 8. GeoPort 9-Pin DTE Connection Application

generator characteristics

232/V.28 423/V.10 562

PARAMETER

TEST CONDITIONS

MIN MAX MIN MAX MIN MAX

UNIT

Open circuit 25 4 6 13.2 V

|VO| Output voltage magnitude

3 kΩ ≤ RL ≤ 7 kΩ

5 15 NA 3.7 V

RL = 450 Ω NA 3.6 NA V

I

OS

Short-circuit output current VO = 0 100 150 60 mA

R

(OFF)

Power-off source resistance VCC = 0, |VO| < 2 V 300 NA 300 Ω

I

O(OFF)

Power-off output current VCC = 0, |VO| < 6 V NA ±100 NA µA

SR Output voltage slew rate 30 NA 4 30 V/µs

±3.3 V to ±3.3 V NA NA 0.22 2.1 µs

t

t

Output transition time

±3 V to ±3 V 0.04 NA NA ui

‡

10% to 90% NA 0.3 NA ui

‡

V

O(RING)

Output voltage ring NA 10% 5%

‡

ui is the unit interval and is the inverse of the signaling rate (bit time).

SN75LBC771

GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

11

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

receiver characteristics

232/V.28 423/V.10 562

PARAMETER

TEST CONDITIONS

MIN MAX MIN MAX MIN MAX

UNIT

|VI| Input voltage 25 10 25 V

p

|VI| < 15 V –3 3 NA –3 3 V

VITInput voltage threshold

|VI| < 10 V NA –0.2 0.2 NA V

p

3 V < |VI| < 15 V 3 7 NA 3 7 kΩ

RIInput resistance

|VI| < 10 V NA 4 NA kΩ

SN75LBC771
GEOPORT TRANSCEIVER

SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997

12

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

MECHANICAL INFORMATION

DW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE

16 PIN SHOWN

4040000/B 03/95

Seating Plane

0.400 (10,15)

0.419 (10,65)

0.104 (2,65) MAX

1

0.012 (0,30)

0.004 (0,10)

A

8

16

0.020 (0,51)

0.014 (0,35)

0.293 (7,45)

0.299 (7,59)

9

0.010 (0,25)

0.050 (1,27)

0.016 (0,40)

(15,24)

(15,49)

PINS **

0.010 (0,25) NOM

A MAX

DIM

A MIN

Gage Plane

20

0.500

(12,70)

(12,95)

0.510

(10,16)

(10,41)

0.400

0.410

16

0.600

24

0.610

(17,78)

28

0.700

(18,03)

0.710

0.004 (0,10)

M

0.010 (0,25)

0.050 (1,27)

0°–8°

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0.006 (0,15).
D. Falls within JEDEC MS-013

IMPORTANT NOTICE

T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
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