Texas Instruments SN75LBC776DB, SN75LBC776DW, SN75LBC776DWR Datasheet

SN75LBC776

SINGLE-CHIP GeoPort TRANSCEIVER

SLLS221A – NOVEMBER 1995 – REVISED JANUARY 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Single-Chip Interface Solution for the 9-terminal GeoPort Host (DTE)

Designed to Operate up to 4 Mbit/s Full Duplex

Single 5-V Supply Operation

6-kV ESD Protection on All Terminals

Backward compatible With AppleTalk and LocalTalk

Combines Multiple Components into a Single-chip Solution

Complements the SN75LBC777 9-Terminal GeoPort Peripheral (DCE) Interface Device

LinBiCMOS Process Technology

description

The SN75LBC776 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 megabits per second (Mbit/s) full duplex. GeoPort is a serial communications standard that is intended to replace the RS-232, Appletalk, and LocalTalk printer ports all in one connector in addition to providing real-time data transfer capability. It provides point-to-point connections between GeoPort-compatible devices with data transmission rates up to 4 Mbit/s full duplex and a hot-plug feature. Applications include connection to telephony, integrated services digital network (ISDN), digital sound and imaging, fax-data modems, and other serial and parallel connections. The GeoPort is backwardly compatible to both LocalTalk and AppleTalk.

While the SN75LBC776 is powered-off (V

= 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. The driver enable (DEN

) terminal sends the outputs of the differential driver into a high-impedance state with a high input signal. All drivers and receivers have fail-safe mechanisms to ensure a high output state when the inputs are left open.

A switched-capacitor voltage converter generates the negative voltage required from a single 5-V supply using four 0.1-µF capacitors, two capacitors between the C+ and C- terminals and two capacitors between V

and

ground. The SN75LBC776 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

C– C+

SHDN

DZ2 DY2

GND

DEN

DA2

GND V

DY1 RY3 RB3 RA2 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.

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

SN75LBC776 SINGLE-CHIP GeoPort TRANSCEIVER

SLLS221A – NOVEMBER 1995 – REVISED JANUARY 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DRIVER FUNCTION TABLE

†

INPUT INPUT ENABLE ENABLE OUTPUT

OUTPUT

DA1 DA2 SHDN DEN DY1

DY2 DZ2

H X L X L X X L X L X H X X X H L L X H L X L L L X L H

OPEN OPEN L L L H L

X X H X Z Z Z X X X H X Z Z X X OPEN OPEN Z Z Z

†

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

RECEIVER FUNCTION TABLE

†

INPUT

RA1 RB1

INPUT

RA2 & RB3

ENABLE

SHDN

OUTPUT

RY1

OUTPUT

RY2

OUTPUT

RY3

HL H L H H L LH L L L L H

OPEN OPEN L H H H

SHORT

‡

SHORT

‡

L ? ? ? XX X H Z Z Z XX X OPEN Z Z Z

†

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

‡

–0.2 V < VID < 0.2 V

function logic diagram (positive logic)

Charge

Pump

DY2 DZ2

RY1

DY1

RY2

RY3

VEE (–5 V)

DA2

DEN

RB1

RA1

DA1

RA2

RB3

SHDN

GND

12 13

19 20

7 6

SN75LBC776

SINGLE-CHIP GeoPort TRANSCEIVER

SLLS221A – NOVEMBER 1995 – REVISED JANUARY 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

†

Positive supply voltage range, V

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

Negative supply voltage range, V

(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

–12 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, SHND, DEN

) –0.5 V to V

CC+

0.4 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Electrostatic discharge (see Note 2): (Bus terminals), Class 3, A 6 kV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(Bus terminals), Class 3, B 500 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

Operating free-air temperature range, T

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 parameter is measured in accordance with MIL-STD-883C, Method 3015.7.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

OPERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

DW 1125 mW 9.0 mW/°C 720 mW

SN75LBC776 SINGLE-CHIP GeoPort TRANSCEIVER

SLLS221A – NOVEMBER 1995 – REVISED JANUARY 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V

4.75 5 5.25 V High-level input voltage, VIHDA, SHDN, DEN 2 5.25 V Low-level input voltage, V

DA, SHDN, DEN 0.8 V

Receiver common-mode input voltage, V

–7 7 V

Receiver differential input voltage, V

–12 12 V Voltage-converter filter capacitance 0.2 µF Voltage-converter filter-capacitor equivalent series resistance (ESR) 0.2 Ω Operating free-air temperature, T

0 70 °C

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

RL = 12 kΩ 3.6 4.53 V

VOHHigh-level output voltage

Single ended,

RL = 120 Ω 2 3.63 V

See Figure 1

RL = 12 kΩ –4.53 –3.6 V

VOLLow-level output voltage

RL = 120 Ω –2.7 –1.8 V

|VOD|

Magnitude of differential output voltage |(V

(DY)

– V

(DZ)

= 120 Ω, See Figure 2

4 V

∆|VOD| Change in differential voltage magnitude

, g

250 mV

Common-mode output voltage –1 3 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

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

ICCSupply current

SHDN = DEN = 5 V, No load 100 µA

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

Short-circuit output current (see Note 3) VO = –5 V to 5 V ±170 ±450 mA

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

SN75LBC776

SINGLE-CHIP GeoPort TRANSCEIVER

SLLS221A – NOVEMBER 1995 – REVISED JANUARY 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

PHL

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

PLH

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

PZL

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

PZH

Driver output enable time to high-level output

Single ended,

25 100 µs

PLZ

Driver output disable time from low-level output

SHDN

See Figure 4

28 100 ns

PHZ

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

Rise time 10 25 75 ns

Fall time 10 23 75 ns

PHL

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

PLH

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

SHDN 25 100 µs

PZL

Driver output enable time to low-level output

DEN 29 150 ns

SHDN 25 100 µs

PZH

Driver output enable time to high-level output

DEN

Differential,

35 150 ns

SHDN

See Figure 5

28 100 ns

PLZ

Driver output disable time from low-level output

DEN 34 100 ns

SHDN 37 100 ns

PHZ

Driver output disable time from high-level output

DEN 34 100 ns

Rise time 10 27 75 ns

Fall time 10 26 75 ns

SK(p)

Pulse skew, |t

PLH

– t

PHL

| 22 ns

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

IT+

Positive-going input threshold voltage 200

IT–

Negative-going input threshold voltage

See Figure 6

–200

hys

Differential input voltage hysteresis (V

IT+

– V

IT–

) 50 mV

High-level output voltage (see Note 4) VIC = 0, IOH = –2 mA, See Figure 6 2 4.9 V

Low-level output voltage VIC = 0, IOL = 2 mA, See Figure 6 0.2 0.8 V

VO = 0 –85 –45

IOSShort-circuit output current

VO = V

47 +85

Input resistance

VCC = 0 or 5.25 V, VI = –12 V to 12 V

6 30 kΩ

NOTE 4: When the inputs are left unconnected, receivers one and two interpret these as high-level inputs and receiver three interprets these

as low-level inputs so that all outputs are at a high level.

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Texas Instruments SN75LBC776DB, SN75LBC776DW, SN75LBC776DWR Datasheet

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