intersil ISL8483, ISL8485, ISL8488, ISL8489, ISL8490 DATA SHEET

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ISL8483, ISL8485, ISL8488,

ISL8489, ISL8490, ISL8491

Data Sheet December 2003

5V, Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers

The Intersil RS-485/RS-422 devices are BiCMOS 5V
powered, single transceivers that meet both the RS-485 and
RS-422 standards for balanced communication. Unlike
competitive devices, this Intersil family is specified for 10%
tolerance supplies (4.5V to 5.5V).

The ISL8483, ISL8488, and ISL8489 utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications.

Data rates up to 5Mbps are achievable by using the
ISL8485, ISL8490, or ISL8491, which feature higher slew
rates.

All devices present a “single unit load” to the RS-485 bus,
which allows up to 32 transceivers on the network.

Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are
floating.

Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.

The ISL8488 - 91 are configured for full duplex (separate Rx
input and Tx output pins) applications. The ISL8488 and
ISL8490 are offered in space saving 8 lead packages for
applications not requiring Rx and Tx output disable functions
(e.g., point-to-point). Half duplex configurations (ISL8483,
ISL8485) multiplex the Rx inputs and Tx outputs to allow
transceivers with Rx and Tx disable functions in 8 lead
packages.

FN6046.3

Features

• Specified for 10% Tolerance Supplies

• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV

• High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 5Mbps

• Slew Rate Limited Versions for Error Free Data
Transmission at 250kbps (ISL8483, ISL8488, ISL8489)

• Single Unit Load Allows up to 32 Devices on the Bus

• 1nA Low Current Shutdown Mode (ISL8483)

• Low Quiescent Current:

µA (ISL8483, ISL8488, ISL8489)

-160

µA (ISL8485, ISL8490, ISL8491)

-340

• -7V to +12V Common Mode Input Voltage Range

• Three State Rx and Tx Outputs (Except ISL8488,
ISL8490)

• 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490,
ISL8491)

• Full Duplex and Half Duplex Pinouts

• Operate from a Single +5V Supply (10% Tolerance)

• Current Limiting and Thermal Shutdown for driver
Overload Protection

Applications

• Factory Automation

• Security Networks

• Building Environmental Control Systems

• Industrial/Process Control Networks

• Level Translators (e.g., RS-232 to RS-422)

• RS-232 “Extension Cords”

TABLE 1. SUMMARY OF FEATURES

PART

NUMBER

ISL8483 Half 32 0.25 Yes Yes 160 Yes 8
ISL8485 Half 32 5 No Yes 340 No 8
ISL8488 Full 32 0.25 Yes No 160 No 8
ISL8489 Full 32 0.25 Yes Yes 160 No 14
ISL8490 Full 32 5 No No 340 No 8
ISL8491 Full 32 5 No Yes 340 No 14

HALF/FULL

DUPLEX

NO. OF DEVICES

ALLOWED ON BUS

1

DATA RATE

(Mbps)

SLEW-RATE

LIMITED?

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

RECEIVER/

DRIVER ENABLE?

| Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

QUIESCENT

I

(µA)

CC

Copyright © Intersil Americas Inc. 2003. All Rights Reserved.

LOW POWER
SHUTDOWN?

PIN

COUNT

ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491

Ordering Information

PART NO.

(BRAND)

ISL8483IB
(8483IB)

ISL8483IB-T
(8483IB)

ISL8483IP -40 to 85 8 Ld PDIP E8.3

ISL8485CB
(8485CB)

ISL8485CB-T
(8485CB)

ISL8485CP 0 to 70 8 Ld PDIP E8.3

ISL8485IB
(8485IB)

ISL8485IB-T
(8485IB)

ISL8485IP -40 to 85 8 Ld PDIP E8.3

ISL8488IB
(8488IB)

ISL8488IB-T
(8488IB)

ISL8488IP -40 to 85 8 Ld PDIP E8.3

ISL8489IB -40 to 85 14 Ld SOIC M14.15

ISL8489IB-T -40 to 85 14 Ld SOIC

TEMP.

RANGE (

o

C) PACKAGE PKG. DWG. #

-40 to 85 8 Ld SOIC M8.15

-40 to 85 8 Ld SOIC
Tape and Reel

0 to 70 8 Ld SOIC M8.15

0 to 70 8 Ld SOIC

Tape and Reel

-40 to 85 8 Ld SOIC M8.15

-40 to 85 8 Ld SOIC
Tape and Reel

-40 to 85 8 Ld SOIC M8.15

-40 to 85 8 Ld SOIC
Tape and Reel

Tape and Reel

M8.15

M8.15

M8.15

M8.15

M14.15

Pinouts

ISL8483, ISL8485 (PDIP, SOIC)

TOP VIEW

RO

RE
DE

1

R

2
3

D

4

DI

8

V

CC

7

B/Z
A/Y

6

GND

5

ISL8488, ISL8490 (PDIP, SOIC)

TOP VIEW

V

CC

RO

GND

1

R

2

DI

3

D

4

8

A

7

B
Z

6

Y

5

ISL8489, ISL8491 (PDIP, SOIC)

TOP VIEW

NC

RO

RE
DE

GND
GND

1
2

R

3
4

DI

D

5
6
7

V

14

CC

NC

13

A

12

B

11

Z

10

9

Y

8

NC

ISL8489IP -40 to 85 14 Ld PDIP E14.3

ISL8490IB

-40 to 85 8 Ld SOIC M8.15

(8490IB)

ISL8490IB-T
(8490IB)

-40 to 85 8 Ld SOIC
Tape and Reel

M8.15

ISL8490IP -40 to 85 8 Ld PDIP E8.3

ISL8491IB -40 to 85 14 Ld SOIC M14.15

ISL8491IB-T -40 to 85 14 Ld SOIC

M14.15

Tape and Reel

ISL8491IP -40 to 85 14 Ld PDIP E14.3

2

ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491

Truth Tables

TRANSMITTING

INPUTS OUTPUTS

RE

X1101
X1010
0 0 X High-Z High-Z
1 0 X High-Z * High-Z *

*Shutdown Mode for ISL8483 (see Note 7)

DE DI Z Y

RE

00X≥ +0.2V 1
00X≤ -0.2V 0
0 0 X Inputs Open 1
100XHigh-Z *
111XHigh-Z

*Shutdown Mode for ISL8483 (see Note 7)

DE

Half DuplexDEFull Duplex

RECEIVING

INPUTS OUTPUT

A-B RO

Pin Descriptions

PIN FUNCTION

RO Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating).

RE

DE Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.

DI Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.

GND Ground connection.

A/Y Noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1.

B/Z Inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1.

V

NC No Connection.

Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.

A Noninverting receiver input.

B Inverting receiver input.

Y Noninverting driver output.

Z Inverting driver output.

System power supply input (4.5V to 5.5V).

CC

3

ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491

Typical Operating Circuits

+5V

ISL8483, ISL8485

+5V

+

8

V

CC

RO

1

2

3

4

RE

DE

DI

R

B/Z
A/Y

D

GND

5

0.1µF

R

7
6

T

R

0.1µF

T

+

8

V

CC

4

DI

D

7

B/Z

6

A/Y

R

GND

5

DE

RE

RO

3
2

1

ISL8488, ISL8490

+5V

+

1

V

CC

RO

2

R

A
B

0.1µF

8
7

R

T

0.1µF

+

+5V

1

V

CC

Y

5

Z

6

D

3

DI

6

GND

Z

5

Y

4

DI

3

D

R

T

B

7

A

8

R

GND

4

RO

2

ISL8489, ISL8491

+5V

+

14

V

CC

2

RO

R

3

RE

4

DE

5

DI

D

A
B

Z
Y

GND

6, 7

0.1µF

12
11

10
9

R

T

R

T

0.1µF

+

10

11
12

+5V

14

V

CC

Y

9

Z

B
A

GND

6, 7

DI

DE
RE

RO

5

4
3

2

D

R

4

ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491

Absolute Maximum Ratings Thermal Information

VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V

Input Voltages

DI, DE, RE

. . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V)

Input/Output Voltages

A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V

RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V

CC

+0.5V)

Short Circuit Duration

Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous

ESD Rating

HBM (Per MIL-STD-883, Method 3015.7) . . . . . . . . . . . . . . >7kV

Thermal Resistance (Typical, Note 1)

8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . 170

8 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . 140

14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 120

14 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . 100

Moisture Sensitivity (see Technical Brief TB363)

All Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1

Maximum Junction Temperature (Plastic Package) . . . . . . . 150

Maximum Storage Temperature Range . . . . . . . . . -65

Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . 300

(SOIC - Lead Tips Only)

Operating Conditions

Temperature Range

ISL84XXCX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0

ISL84XXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

1. θ

JA

o

C to 70oC

o

C to 85oC

θ

(oC/W)

JA

o

C to 150oC

o

o

C

C

Electrical Specifications Test Conditions: V

Typicals are at V

PARAMETER SYMBOL TEST CONDITIONS

DC CHARACTERISTICS

Driver Differential V
Driver Differential V

Change in Magnitude of Driver
Differential V

OUT

Complementary Output States
Driver Common-Mode V
Change in Magnitude of Driver

Common-Mode V
Complementary Output States

Logic Input High Voltage V
Logic Input Low Voltage V
Logic Input Current I

Input Current (A, B), Note 10 I

Receiver Differential Threshold
Voltage

Receiver Input Hysteresis ∆V
Receiver Output High Voltage V
Receiver Output Low Voltage V
Three-State (high impedance)

Receiver Output Current

(no load) V

OUT

(with load) V

OUT

for

OUT

for

OUT

∆V

V

∆V

I
I

V

I

OZR

OD1
OD2

OD

OC

OC

IH

IL
IN1
IN1
IN1
IN2

TH

TH

OH
OL

R = 50Ω (RS-422), Figure 1 Full 2 3 - V
R = 27Ω (RS-485), Figure 1 Full 1.5 2.3 5 V
R = 27Ω or 50Ω, Figure 1 Full - 0.01 0.2 V

R = 27Ω or 50Ω, Figure 1 Full - - 3 V
R = 27Ω or 50Ω, Figure 1 Full - 0.01 0.2 V

DE, DI, RE Full 2 - - V
DE, DI, RE Full - - 0.8 V
DE, DI, RE (ISL8483) Full -2 - 2 µA

DI (ISL8485 - ISL8491) Full -2 - 2 µA
DE, RE (ISL8485, ISL8489, ISL8491) Full -25 - 25 µA

DE = 0V, VCC = 0V or

4.5 to 5.5V

-7V ≤ VCM ≤ 12V Full -0.2 - 0.2 V

VCM = 0V 25 - 70 - mV
IO = -4mA, VID = 200mV Full 3.5 - - V
IO = -4mA, VID = 200mV Full - - 0.4 V

0.4V ≤ VO ≤ 2.4V Full - - ±1 µA

= 4.5V to 5.5V; Unless Otherwise Specified.

CC

= 5V, TA = 25oC, Note 2

CC

VIN = 12V Full - - 1 mA
V

= -7V Full - - -0.8 mA

IN

TEMP

o

C) MIN TYP MAX UNITS

(

Full - - V

CC

V

5