NSC DS3697N, DS3696N, DS3695TN Datasheet

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

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

May 1998

General Description

The DS3695, DS3696, and DS3697 are high speed differen­tial TRI-STATE
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 aninternal10 kΩ 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.

®

bus/line transceivers/repeaters designed to

Connection and Logic Diagrams

DS010408-1

Top View

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

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

Top View

DS010408-12

±

7V

DS010408-13

Top View

Order Number DS3695N, DS3695TN,

DS3696N, or DS3697N

See NS Package Number N08E

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.

© 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

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)

Receiver Output Voltage 5.5V

@

Continuous Power Dissipation

25˚C

N Package 1.07W (Note

7V

±

25V

Storage Temperature Range −65˚C to

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

+150˚C

Recommended Operating
Conditions

Min Max Units

)

A

4.75 5.25 V

Supply Voltage, V

CC

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

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

4)

Electrical Characteristics (Notes 3, 4)

0˚C ≤ TA≤ +70˚C, 4.75V<V

Symbol Parameter Conditions Min Typ Max Units

V

Differential Driver Output I

OD1

Voltage (Unloaded)

V

Differential Driver Output (

OD2

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

∆V

Change in Magnitude of Driver

OD

Differential Output Voltage for 0.2 V

Complementary Output States
V
∆|V

Driver Common Mode Output Voltage (

OC

| Change in Magnitude of Driver

OC

Common Mode Output Voltage 0.2 V

for Complementary Output States
V
V
V
I
I
I

I

Input High Voltage 2V

IH

Input Low Voltage DI, DE, 0.8 V

IL

Input Clamp Voltage RE , E, RE /DE I

CL

Input Low Current V

IL

Input High Current V

IH

Input Current DO/RI, DO /RI V

IN

TRI-STATE Current DO, DO V

OZD

DS3697 & DS3698 −7V
V

Differential Input Threshold −7V ≤ VCM≤ +12V −0.2 +0.2 V

TH

Voltage for Receiver
∆V
V
V

I

Receiver Input Hysteresis V

TH

Receiver Output High Voltage I

OH

Output Low Voltage RO I

OL

OFF-State (High Impedance) V

OZR

Output Current at Receiver 0.4V ≤ V
R

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

IN

<

5.25V unless otherwise specified

CC

O

Figure 1

Figure 1

CC

5.25V

RI, RI

TS

RE /DE or DE
0V

CC

CM
OH
OL

I

OL

CC

=

05V

=

+12V

=

50Ω; (RS-422) (Note6)2V

=

27Ω 3.0 V

=

−18 mA −1.5 V

IN

=

0.4V −200 µA

IL

=

2.4V 20 µA

IH

=

V

12V +1.0 mA

IN

=

V

−7V −0.8 mA

IN

±

100 µA

±

20 µA

)R

)R

=

0V or

=

0V or 5.25V, E=0V

<

<

V

O

=

0V 70 mV

=

−400 µA 2.4 V

=

16 mA (Note 6) 0.5 V

=

8 mA 0.45 V

=

Max

≤ 2.4V

O

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Electrical Characteristics (Notes 3, 4) (Continued)

0˚C ≤ TA≤ +70˚C, 4.75V<V

Symbol Parameter Conditions Min Typ Max Units

I

I

I

Supply Current No Load Driver Outputs Enabled 42 60 mA

CC

Driver Short-Circuit Output Current V

OSD

Receiver Short-Circuit Output Current V

OSR

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: Allcurrents 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
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

≤ +85˚C).

A

<

5.25V unless otherwise specified

CC

=

CC

5V and T

=

25˚C.

A

(Note 6) Driver Outputs Disabled 27 40 mA

=

−7V (Note 6) −250 mA

O

=

V

+12V (Note 6) +250 mA

O

=

0V −15 −85 mA

O

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

≤ +70˚C, 4.75V<V

A

<

5.25V unless otherwise specified

CC

Receiver Switching Characteristics

(

Figures 2, 3, 4

)

Symbol Conditions Min Typ Max Units

=

t

PLH

t

PHL

|t

PLH–tPHL

t

PLZ

t

PHZ

t

PZL

t

PZH

| Closed 0 ns

C

15 pF 15 25 37 ns

L

S1 and S2 15 25 37 ns

=

C

15 pF, S2 Open 5 12 16 ns

L

=

C

15 pF, S1 Open 5 12 16 ns

L

=

C

15 pF, S2 Open 7 15 20 ns

L

=

C

15 pF, S1 Open 7 15 20 ns

L

Driver Switching Characteristics

Symbol Conditions Min Typ Max Units

SINGLE ENDED CHARACTERISTICS (

t

PLH

t

PHL

t

SKEW|tPLH–tPHL

t

PLZ

t

PHZ

t

PZL

t

PZH

|28ns

RLDIFF=60Ω 91522 ns
C

C
C
C

C
DIFFERENTIAL CHARACTERISTICS (
t

r,tf

RLDIFF=60Ω 61018 ns

C

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

Figures 5, 6, 7

=

=

C

L1

=

L

=

L

=

L

=

L

100 pF 9 15 22 ns

L2

15 pF, S2 Open 7 15 30 ns
15 pF, S1 Open 7 15 30 ns
100 pF, S2 Open 30 35 50 ns
100 pF, S1 Open 30 35 50 ns

Figures 5, 8

=

=

C

L1

100 pF

L2

)

)

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AC Test Circuits and Switching Waveforms

FIGURE 1. Driver VODand V

FIGURE 2. Receiver Propagation Delay Test Circuit

DS010408-15

OC

DS010408-3

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

FIGURE 4. Receiver Enable/Disable Propagation Delay Timing

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DS010408-4

DS010408-5