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.

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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