NSC DS36277TN, DS36277TMX, DS36277TM Datasheet

DS36277
Dominant Mode Multipoint Transceiver

General Description

The DS36277 Dominant Mode Multipoint Transceiver is de­signed for use on bi-directional differential busses. It is opti­mal for use on Interfaces that utilize Society of Automotive
Engineers (SAE) J1708 Electrical Standard.

The device is similar to standard TIA/EIA-485 transceivers,
but differs in enabling scheme. The Driver’s Input is normally
externally tied LOW, thus providing only two states: Active
(LOW), or Disabled (OFF). When the driver is active, the
dominant mode is LOW, conversely, when the driver is dis­abled, the bus is pulled HIGH by external bias resistors.

The receiver provides a FAILSAFEfeaturethat guarantees a
known output state when the Interface is in the following con­ditions: Floating Line, Idle Line (no active drivers), and Line
Fault Conditions (open or short). The receiver output is
HIGH for the following conditions: Open Inputs, Terminated
Inputs (50Ω), or Shorted Inputs. FAILSAFE is a highly desir­able feature when the transceivers are used with Asynchro­nous Controllers such as UARTs.

Features

n FAILSAFE receiver, RO = HIGH for:

— OPEN inputs
— Terminated inputs
— SHORTED inputs

n Optimal for use in SAE J1708 Interfaces
n Compatible with popular interface standards:

— TIA/EIA-485 and TIA/EIA-422-A
— CCITT recommendation V.11

n Bi-directional transceiver

— Designed for multipoint transmission

n Wide bus common mode range

— (−7V to +12V)

n Available in plastic DIP and SOIC packages

Connection and Logic Diagram Truth Tables

Driver

Inputs Outputs

DE

DI DO/RI DO /RI

LL L H
LH H L
HX Z Z

Receiver

Inputs Output

RE

DO/RI–DO /RI RO

L ≥ 0mV H
L ≤−500 mV L
L SHORTED H
L OPEN H
HX Z

TRI-STATE®is a registered trademark of National Semiconductor Corporation.

DS011384-1

Order Number DS36277TM or DS36277TN

See NS Package Number M08A or N08E

July 1998

DS36277 Dominant Mode Multipoint Transceiver

© 1999 National Semiconductor Corporation DS011384 www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage (V

CC

)7V

Input Voltage (DE , RE , and DI)

5.5V

Driver Output Voltage/

Receiver Input Voltage −10V to +15V

Receiver Output Voltage (RO) 5.5V

Maximum Package Power Dissipation

@

+25˚C

N Package
(derate 9.3 mW/˚C above +25˚C) 1168 mW

M Package
(derate 5.8 mW/˚C above +25˚C) 726 mW

Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering 4 sec.) 260˚C
ESD Rating (HBM, 1.5 kΩ, 100 pF) ≥ 6.0 kV

Recommended Operating
Conditions

Min Max Units

Supply Voltage, V

CC

4.75 5.25 V
Bus Voltage −7 +12 V
Operating Temperature (T

A

)

DS36277T −40 +85 ˚C

Electrical Characteristics (Notes 2, 4)

Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

DRIVER CHARACTERISTICS

V

OD

Differential Output Voltage IO= 0 mA (No Load) 1.5 3.6 6 V

V

oDO

Output Voltage IO= 0 mA (Output to GND) 0 6 V

V

oDO

Output Voltage 0 6 V

V

T1

Differential Output Voltage
(Termination Load)

RL=54Ω(485) (

Figure 1

) 1.3 2.2 5.0 V

R

L

= 100Ω (422) 1.7 2.6 5.0 V

∆V

T1

Balance of V

T1

RL=54Ω (Note 3) −0.2 0.2 V

|V

T1−VT1

| RL= 100Ω −0.2 0.2 V

V

OS

Driver Common Mode
Output Voltage

RL=54Ω (

Figure 1

) 0 2.5 3.0 V

R

L

= 100Ω 0 2.5 3.0 V

∆V

OS

Balance of V

OS

RL=54Ω (Note 3) −0.2 0.2 V

|V

OS−VOS

| RL= 100Ω −0.2 0.2 V

V

OH

Output Voltage High IOH= −22 mA (

Figure 2

) 2.7 3.7 V

V

OL

Output Voltage Low IOL= +22 mA 1.3 2 V

I

OSD

Driver Short-Circuit
Output Current

VO= +12V (

Figure 3

) 92 290 mA

V

O

= −7V −187 −290 mA

RECEIVER CHARACTERISTICS

V

TH

Differential Input High
Threshold Voltage (Note 5)

VO=VOH,IO= −0.4 mA −0.150 0 V

−7V ≤ V

CM

≤ +12V

V

TL

Differential Input Low
Threshold Voltage (Note 5)

VO=VOL,IO= 8.0 mA −0.5 −0.230 V

−7V ≤ V

CM

≤ +12V

V

HST

Hysteresis (Note 6) VCM=0V 80 mV

I

IN

Line Input Current
(V

CC

= 4.75V, 5.25V, 0V)

Other Input = 0V V

I

= +12V 0.5 1.5 mA

DE=V

IH

(Note 7) VI= −7V −0.5 −1.5 mA

I

OSR

Short Circuit Current VO= 0V RO −15 −32 −85 mA

I

OZ

TRI-STATE®Leakage Current VO= 0.4 to 2.4V −20 1.4 +20 µA

V

OH

Output High Voltage
(

Figure 12

)

V

ID

= 0V, IOH= −0.4 mA 2.3 3.7 V

V

ID

= OPEN, IOH= −0.4 mA 2.3 3.7 V

V

OL

Output Low Voltage
(

Figure 12

)

V

ID

= −0.5V, IOL= +8 mA 0.3 0.7 V

V

ID

= −0.5V, IOL= +16 mA 0.3 0.8 V

R

IN

Input Resistance 10 20 kΩ

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Electrical Characteristics (Notes 2, 4) (Continued)

Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

DEVICE CHARACTERISTICS

V

IH

High Level Input Voltage DE ,

RE ,
or
DI

2.0 V

CC

V

V

IL

Low Level Input Voltage GND 0.8 V

I

IH

High Level Input Current VIH= 2.4V 20 µA

I

IL

Low Level Input Current VIL= 0.4V −100 µA

V

CL

Input Clamp Voltage ICL= −18 mA −0.7 −1.5 V

I

CC

Output Low Voltage DE = 0V, RE = 0V, DI = 0V 39 60 mA

I

CCR

Supply Current DE = 3V, RE = 0V, DI = 0V 24 50 mA

I

CCD

(No Load) DE = 0V, RE = 3V, DI = 0V 40 75 mA

I

CCX

DE = 3V, RE = 3V, DI = 0V 27 45 mA

Switching Characteristics (Note 4)

Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

DRIVER CHARACTERISTICS

t

PLHD

Diff. Prop. Delay Low to High RL=54Ω 81760 ns

t

PHLD

Diff. Prop. Delay High to Low CL= 50 pF 8 19 60 ns

t

SKD

Diff. Skew (|t

PLHD–tPHLD

|) CD=50pF 2 10 ns

t

r

Diff. Rise Time (

Figures 4, 5

)1160ns

t

f

Diff. Fall Time 11 60 ns

t

PLH

Prop. Delay Low to High RL=27Ω,CL=15pF 22 85 ns

t

PHL

Prop. Delay High to Low (

Figures 6, 7

)2585ns

t

PZH

Enable Time Z to High RL= 110Ω 25 60 ns

t

PZL

Enable Time Z to Low CL=50pF 30 60 ns

t

PHZ

Disable Time High to Z (

Figure 8–Figure 11

)1660ns

t

PLZ

Disable Time Low to Z 11 60 ns

RECEIVER CHARACTERISTICS

t

PLH

Prop. Delay Low to High VID= −1.5V to +1.5V 15 37 90 ns

t

PHL

Prop. Delay High to Low CL=15pF 15 43 90 ns

t

SK

Skew (|t

PLH–tPHL

|) (

Figures 13, 14

) 6 15 ns

t

PZH

Enable Time Z to High CL=15pF 12 60 ns

t

PZL

Enable Time Z to Low (

Figures 15, 16

)2860ns

t

PHZ

Disable Time High to Z 20 60 ns

t

PLZ

Disable Time Low to Z 10 60 ns

Note 1: “AbsoluteMaximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation.

Note 2: Currentinto device pins is definedaspositive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise speci­fied.

Note 3: ∆ |V

T1

| and ∆ |VOS| are changes in magnitude of VT1and VOS, respectively, that occur when the input changes state.

Note 4: All typicals are given for V

CC

= 5.0V and TA= +25˚C.

Note 5: Threshold parameter limits specified as an algebraic value rather than by magnitude.
Note 6: Hysteresis defined as V

HST=VTH−VTL

.

Note 7: I

IN

includes the receiver input current and driver TRI-STATE leakage current.

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Parameter Measurement Information

DS011384-2

FIGURE 1. Driver VT1and VOSTest Circuit

DS011384-3

FIGURE 2. Driver VOHand VOLTest Circuit

DS011384-4

FIGURE 3. Driver Short Circuit Test Circuit

DS011384-5

FIGURE 4. Driver Differential Propagation Delay and Transition Time Test Circuit

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