NSC DS3695N, DS3695MWC Datasheet

DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters

General Description

The DS3695, DS3696, and DS3697 are high speed differen­tial TRI-STATE

®

bus/line transceivers/repeaters designed to
meet the requirementsofEIAstandard RS485 with extended
common mode range (+12V to −7V), for multipoint data
transmission.

The driver and receiver outputs feature TRI-STATE capabil­ity. The driver outputs remain in TRI-STATE over the entire
common mode range of +12V to −7V. Bus faults that cause
excessive power dissipation within the device trigger a ther­mal shutdown circuit, which forces the driver outputs into the
high impedance state. The DS3696 provides an output pin
TS (thermal shutdown) which reports the occurrence of the
thermal shutdown of the device. This is an “open collector”
pin with aninternal10kΩ pull-up resistor. This allows the line
fault outputs of several devices to be wire OR-ed.

Both AC and DC specifications are guaranteed over the 0˚C
to 70˚C temperature and 4.75V to 5.25V supply voltage
range.

Features

n Meets EIA standard RS485 for multipoint bus

transmission and is compatible with RS-422

n 15 ns driver propagation delays with 2 ns skew (typical)
n Single +5V supply
n −7V to +12V bus common mode range permits

±

7V

ground difference between devices on the bus

n Thermal shutdown protection
n High impedance to bus with driver in TRI-STATE or with

power off, over the entire common mode range allows
the unused devices on the bus to be powered down

n Combined impedance of a driver output and receiver

input is less than one RS485 unit load, allowing up to 32
transceivers on the bus

n 70 mV typical receiver hysteresis

Connection and Logic Diagrams

Note 1: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device.

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

DS010408-1

Top View

DS010408-12

Top View

DS010408-13

Top View

Order Number DS3695N, DS3695TN,

DS3696N, or DS3697N

See NS Package Number N08E

May 1998

DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters

© 1998 National Semiconductor Corporation DS010408 www.national.com

Absolute Maximum Ratings (Note 2)

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

Supply Voltage, V

CC

7V
Control Input Voltages 7V
Driver Input Voltage 7V
Driver Output Voltages +15V/−10V
Receiver Input Voltages

(DS3695, DS3696) +15V/−10V

Receiver Common Mode Voltage

(DS3697)

±

25V
Receiver Output Voltage 5.5V
Continuous Power Dissipation

@

25˚C

N Package 1.07W (Note

4)

Storage Temperature Range −65˚C to

+150˚C

Lead Temperature (Soldering, 4
sec.) 260˚C

Recommended Operating
Conditions

Min Max Units

Supply Voltage, V

CC

4.75 5.25 V
Bus Voltage −7 +12 V
Operating Free Air Temp. (T

A

)
Commercial 0 +70 ˚C
Industrial −40 +85 ˚C

Electrical Characteristics (Notes 3, 4)

0˚C ≤ TA≤ +70˚C, 4.75V<V

CC

<

5.25V unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

V

OD1

Differential Driver Output I

O

=

05V

Voltage (Unloaded)

V

OD2

Differential Driver Output (

Figure 1

)R

=

50Ω; (RS-422) (Note6)2V

Voltage (with Load) R=27Ω; (RS-485) 1.5 V

∆V

OD

Change in Magnitude of Driver
Differential Output Voltage for 0.2 V
Complementary Output States

V

OC

Driver Common Mode Output Voltage (

Figure 1

)R

=

27Ω 3.0 V

∆|V

OC

| Change in Magnitude of Driver

Common Mode Output Voltage 0.2 V
for Complementary Output States

V

IH

Input High Voltage 2V

V

IL

Input Low Voltage DI, DE, 0.8 V

V

CL

Input Clamp Voltage RE , E, RE /DE I

IN

=

−18 mA −1.5 V

I

IL

Input Low Current V

IL

=

0.4V −200 µA

I

IH

Input High Current V

IH

=

2.4V 20 µA

I

IN

Input Current DO/RI, DO /RI V

CC

=

0V or

5.25V

V

IN

=

12V +1.0 mA

RI, RI

RE /DE or DE

=

0V

V

IN

=

−7V −0.8 mA

I

OZD

TRI-STATE Current DO, DO V

CC

=

0V or 5.25V, E=0V

±

100 µA

DS3697 & DS3698 −7V

<

V

O

<

+12V

V

TH

Differential Input Threshold −7V ≤ VCM≤ +12V −0.2 +0.2 V
Voltage for Receiver

∆V

TH

Receiver Input Hysteresis V

CM

=

0V 70 mV

V

OH

Receiver Output High Voltage I

OH

=

−400 µA 2.4 V

V

OL

Output Low Voltage RO I

OL

=

16 mA (Note 6) 0.5 V

TS

I

OL

=

8 mA 0.45 V

I

OZR

OFF-State (High Impedance) V

CC

=

Max

±

20 µA

Output Current at Receiver 0.4V ≤ V

O

≤ 2.4V

R

IN

Receiver Input Resistance −7V ≤ VCM≤ +12V 12 kΩ

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Electrical Characteristics (Notes 3, 4) (Continued)

0˚C ≤ TA≤ +70˚C, 4.75V<V

CC

<

5.25V unless otherwise specified

Symbol Parameter Conditions Min Typ Max Units

I

CC

Supply Current No Load Driver Outputs Enabled 42 60 mA

(Note 6) Driver Outputs Disabled 27 40 mA

I

OSD

Driver Short-Circuit Output Current V

O

=

−7V (Note 6) −250 mA

V

O

=

+12V (Note 6) +250 mA

I

OSR

Receiver Short-Circuit Output Current V

O

=

0V −15 −85 mA

Note 2: “Absolute Maximum Ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should
be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.

Note 3: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified.
Note 4: All typicals are given for V

CC

=

5V and T

A

=

25˚C.

Note 5: Derate linearly at 11.1 mW/˚C to 570 mW at 70˚C.
Note 6: All limits for which Note 5 is applied must be derated by 10%for DS3695T and DS3696T. Other parameters remain the same for this extended temperature

range device (−40˚C ≤ T

A

≤ +85˚C).

Switching Characteristics (Notes 4, 7) 0˚C ≤ T

A

≤ +70˚C, 4.75V<V

CC

<

5.25V unless otherwise specified

Receiver Switching Characteristics

(

Figures 2, 3, 4

)

Symbol Conditions Min Typ Max Units

t

PLH

C

L

=

15 pF 15 25 37 ns

t

PHL

S1 and S2 15 25 37 ns

|t

PLH–tPHL

| Closed 0 ns

t

PLZ

C

L

=

15 pF, S2 Open 5 12 16 ns

t

PHZ

C

L

=

15 pF, S1 Open 5 12 16 ns

t

PZL

C

L

=

15 pF, S2 Open 7 15 20 ns

t

PZH

C

L

=

15 pF, S1 Open 7 15 20 ns

Driver Switching Characteristics

Symbol Conditions Min Typ Max Units

SINGLE ENDED CHARACTERISTICS (

Figures 5, 6, 7

)

t

PLH

RLDIFF=60Ω 91522 ns

t

PHL

C

L1

=

C

L2

=

100 pF 9 15 22 ns

t

SKEW|tPLH–tPHL

|28ns

t

PLZ

C

L

=

15 pF, S2 Open 7 15 30 ns

t

PHZ

C

L

=

15 pF, S1 Open 7 15 30 ns

t

PZL

C

L

=

100 pF, S2 Open 30 35 50 ns

t

PZH

C

L

=

100 pF, S1 Open 30 35 50 ns

DIFFERENTIAL CHARACTERISTICS (

Figures 5, 8

)

t

r,tf

RLDIFF=60Ω 61018 ns
C

L1

=

C

L2

=

100 pF

Note 7: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3697 only.

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AC Test Circuits and Switching Waveforms

DS010408-15

FIGURE 1. Driver VODand V

OC

DS010408-3

FIGURE 2. Receiver Propagation Delay Test Circuit

DS010408-4

Note: Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V.

FIGURE 3. Receiver Input-to-Output Propagation Delay Timing

DS010408-5

FIGURE 4. Receiver Enable/Disable Propagation Delay Timing

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