Texas Instruments SN75LBC777DW, SN75LBC777DWR Datasheet

SN75LBC777

SINGLE CHIP GEOPORT/AppleTalk TRANSCEIVER

SLLS227 – SEPTEMBER 1996

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Single-Chip Interface Solution for the 9-Pin
GeoPort Peripheral Data Circuit­Terminating Equipment (DCE) for the
Intelligent Network Port

D

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

D

Single 5-V Supply Operation

D

10-kV ESD Protection on Bus Terminals

D

Backward Compatible with AppleTalk and
LocalTalk LANs

D

Combines Multiple Components into a
Single Chip Solution

D

Complements the SN75LBC776 9-Terminal
GeoPort Host Data Terminal Equipment
(DTE) Interface Device

D

LinBiCMOS Process Technology

description

The SN75LBC777 is a low-power LinBiCMOS
device that incorporate the drivers and receivers
for a 9-pin GeoPort peripheral 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
SN75LBC777 provides point-to-point connec­tions between GeoPort-compatible devices with
data transmission rates up to 4-Mbit/s full duplex
over a 4-foot cable. Applications include connec­tion to telephone, integrated services digital
network (ISDN), digital sound and imaging,
fax-data modems, and other traditional serial and
parallel connections. The GeoPort is backwardly
compatible to both LocalT alk and AppleT alk LANs.

While the SN75LBC777 is powered off (V

CC

= 0)
the outputs are in a high-impedance state. When
the shutdown (SHDN) terminal is high, the charge
pump is powered down and the outputs are in a
high-impedance state. When high, the driver
enable (DEN

) terminal puts the outputs of the

differential driver into a high-impedance state.

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.

DY2
DZ2

RY1

DY1

RY2

DA2

DEN

RB1

RA1

DA1

RB2

SHDN

10

9

12
13

11

1

5

18

15

14

7
6

DY3

DA3

16 17

Charge Pump V

EE

V

CC

GND

2

8

19

logic diagram (positive logic)

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

DA1

V

EE

C–
C+

SHDN

DZ2
DY2

GND

DEN

DA2

GND
V

CC

DY1
DY3
DA3
RB2
RY2
RB1
RA1
RY1

DW PACKAGE

(TOP VIEW)

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  1996, Texas Instruments Incorporated

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

SN75LBC777
SINGLE CHIP GEOPORT/AppleTalk TRANSCEIVER

SLLS227 – SEPTEMBER 1996

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

description (continued)

A switched-capacitor voltage converter generates the negative voltage required from a single 5-V supply using
two 0.33-µF capacitors. One capacitor is between the C+ and C– terminals and the other is between V

EE

and

ground.
The SN75LBC777 is characterized for operation over the 0°C to 70°C temperature range.

DRIVER FUNCTION TABLE

INPUTS

ENABLE OUTPUTS

DA1 DA2 DA3 SHDN DEN DY1 DY2 DZ2 DY3

H X H L X L X X H
L XL L XHXXL
X HX L LXHLX
X LX L LXLHX

OPEN OPEN OPEN L LLHLH

X XXH XZZZZ
X XXX HXZZX
X X XOPEN OPEN Z Z Z Z

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

RECEIVER FUNCTION TABLE

INPUTS

ENABLE OUTPUTS

RA1 RB1 RB2 SHDN RY1 RY2

H L H L H L
L HL L LH

OPEN OPEN L H H

SHORT

†

SHORT

†

L ? ?
X XX H ZZ
XXX OPEN Z Z

†

–0.2 V < VID < 0.2 V
H = high level, L= low level, X = irrelevant, ? = indeterminate,
Z = high impedance (off)

SN75LBC777

SINGLE CHIP GEOPORT/AppleTalk TRANSCEIVER

SLLS227 – SEPTEMBER 1996

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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 (RA1, RB1, RB2) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver differential input voltage range, V

ID

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

Receiver output voltage range (RY1, RY2

) –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver output voltage range (Power Off)(DY1

, DY2, DZ2, DY3) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . .

Driver output voltage range (Power On)(DY1

, DY2, DZ2, DY3) –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)

Bus Pins (Class 3 A) 10 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bus Pins (Class 3 B) 600 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

All Pins (Class 3, A) 2 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

All Pins (Class 3 B) 200 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 voltages values are with respect to the network ground terminal unless otherwise noted.

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

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATE FACTOR
ABOVE TA = 25°C

TA = 70°C

POWER RATING

DW 1125 mW 9.0°C 720 mW

SN75LBC777
SINGLE CHIP GEOPORT/AppleTalk TRANSCEIVER

SLLS227 – SEPTEMBER 1996

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V

CC

4.75 5 5.25 V
High-level input voltage, VIH(DA, SHDN, DEN) 2 5.25 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
Voltage converter filter capacitance 0.33 µF
Voltage converter filter capacitor equivalent series resistance (ESR) 0 0.2 Ω
Operating free-air temperature, T

A

70 °C

driver electrical characteristics over 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 –2.7 –1.8 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 –1 3 V

|∆V

OC(SS)

|

Magnitude of change, common-mode steady­state output voltage

See Figure 3

200 mV

|∆V

OC(PP)

|

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

700 mV

pp

SHDN = DEN = 0 V, No Load 7 15 mA

ICCSupply 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.

SN75LBC777

SINGLE CHIP GEOPORT/AppleTalk TRANSCEIVER

SLLS227 – SEPTEMBER 1996

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

driver switching characteristics over recommended operating conditions (unless otherwise
noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

t

PHL

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

t

PLH

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

t

PZL

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

t

PZH

Driver output enable time to high-level output SHDN

Single-ended,

25 100 µs

t

PLZ

Driver output disable time from low-level output SHDN

R

L

=

120 Ω

,

See

Figure 4

30 100 ns

t

PHZ

Driver output disable time from high-level output SHDN

See Figure 4

30 100 ns

t

r

Rise time 10 25 75 ns

t

f

Fall time 10 25 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 40 75 ns

p

p

SHDN 25 100 µs

t

PZL

Driver output enable time to low-level output

DEN 35 100 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

R

L

=

120 Ω

,

See

Figure

5

30 100 ns

t

PLZ

Driver output disable time from low-level output

DEN

See Figure 5

30 100 ns

p

p

SHDN 35 100 ns

t

PHZ

Driver output disable time from high-level output

DEN 35 100 ns

t

r

Rise time 10 25 75 ns

t

f

Fall time 10 25 75 ns

t

SK(P)

Pulse skew, |t

PLH

– t

PHL

| 22 ns

receiver electrical characteristics over free-air temperature range (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 –200 mV

V

hys

Differential input voltage hysteresis (V

IT+

– V

IT–

) 50 mV

V

OH

High-level output voltage (see Note 4) IOH = 2 mA, VIC = 0 2 4.9 V

V

OL

Low-level output voltage IOL = –2 mA, VIC = 0 0.2 0.8 V

p

VO = 0 –85 –45 mA

IOSShort-circuit output current

VO = 5.25 V 45 85 mA

R

I

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

NOTE 4: If the inputs are left unconnected, RA1 interprets this as a high-level input and RB1 and RB2 interpret this as a low-level input so that

all outputs are at the high level.