ISL81483 Intersil Corporation, ISL81483 Datasheet

ISL81483

Manufacturer Part Number

ISL81483

Description

1/8 Unit Load, Half Duplex, 5V, Low Power, Slew Rate Limited, RS-485/RS-422 Transceiver, With Rx/tx Enables And Low Power SHDN These Intersil RS-485/RS-422 Devices Are Fractional Unit Load (UL), Bicmos, 5V Powered, Single Transceivers That Meet Both

Manufacturer

Intersil Corporation

Datasheet

1.ISL81483.pdf (13 pages)

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1/8 Unit Load, 5V, Low Power, High Speed

or Slew Rate Limited, RS-485/RS-422

Transceivers

These Intersil RS-485/RS-422 devices are “fractional” unit

load (UL), 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 ISL81483 and ISL81487 present a 1/8 unit load to the

RS-485 bus, which allows up to 256 transceivers on the

network for large node count systems (e.g., process

automation, remote meter reading systems). The 1/4 UL

ISL8487 allows up to 128 transceivers on the bus. In a

remote utility meter reading system, individual (apartments

for example) utility meter readings are routed to a

concentrator via an RS-485 network, so the high allowed

node count minimizes the number of repeaters required to

network all the meters. Data for all meters is then read out

from the concentrator via a single access port, or a wireless

link.

Slew rate limited drivers on the ISL8487 and ISL81483

reduce EMI, and minimize reflections from improperly

terminated transmission lines, or unterminated stubs in

multidrop and multipoint applications. Data rates up to

250kbps are achievable with these devices.

Data rates up to 5Mbps are achievable by using the

ISL81487, which features higher slew rates.

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.

These half duplex devices multiplex the Rx inputs and Tx

outputs to allow transceivers with Rx and Tx disable

functions in 8 lead packages.

NUMBER

ISL81483

ISL81487

ISL8487

PART

HALF/FULL

DUPLEX

Half

ALLOWED ON BUS

NO. OF DEVICES

128

256

Data Sheet

DATA RATE

TABLE 1. SUMMARY OF FEATURES

(Mbps)

0.25

1-888-INTERSIL or 321-724-7143

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

SLEW-RATE

LIMITED?

Yes

Features

• Fractional Unit Load Allows up to 256 Devices on the Bus

• Specified for 10% Tolerance Supplies

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

• High Data Rate Version (ISL81487) . . . . . . . up to 5Mbps

• Slew Rate Limited Versions for Error Free Data

• Low Current Shutdown Mode (Except ISL81487) . . . 1nA

• Low Quiescent Supply Current:

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

• Three State Rx and Tx Outputs

• 30ns Propagation Delays, 5ns Skew (ISL81487)

• Half Duplex Pinouts

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

• Current Limiting and Thermal Shutdown for driver

• Drop-In Replacements for: MAX487 (ISL8487); MAX1483

Applications

• High Node Count Networks

• Automated Utility Meter Reading Systems

• Factory Automation

• Security Networks

• Building Environmental Control Systems

• Industrial/Process Control Networks

Transmission (ISL8487, ISL81483) . . . . . . .up to 250kbps

- ISL8487, ISL81483. . . . . . . . . . . . . . . . . . 120

- ISL81487 . . . . . . . . . . . . . . . . . . . . . . . . . 300

Overload Protection

(ISL81483); MAX1487, LMS1487 (ISL81487)

DRIVER ENABLE?

ISL8487, ISL81483, ISL81487

RECEIVER/

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

Yes

March 2004

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

QUIESCENT

100

250

(µA)

SHUTDOWN?

LOW POWER

Yes

FN6050.3

A (Max.)

COUNT

Related parts for ISL81483

ISL81483 Summary of contents

Page 1

... Slew Rate Limited Versions for Error Free Data Transmission (ISL8487, ISL81483 .up to 250kbps • Low Current Shutdown Mode (Except ISL81487 1nA • Low Quiescent Supply Current: - ISL8487, ISL81483 120 - ISL81487 . . . . . . . . . . . . . . . . . . . . . . . . . 300 • -7V to +12V Common Mode Input Voltage Range • Three State Rx and Tx Outputs • ...

Page 2

... RS-485/422 level, inverting receiver input and inverting driver output. Pin is an input ( pin is an output ( System power supply input (4.5V to 5.5V ISL8487, ISL81483, ISL81487 Truth Tables B/Z 6 A/Y 5 GND *Shutdown Mode for ISL8487, ISL81483 (see Note 7) PKG. DWG. # M8.15 E8.3 M8.15 E8.3 M8.15 *Shutdown Mode for ISL8487, ISL81483 (see Note 7) E8.3 FUNCTION TRANSMITTING INPUTS ...

Page 3

... Typical Operating Circuits + B/Z A GND 5 3 ISL8487, ISL81483, ISL81487 ISL8487, ISL81483, ISL81487 + 0.1µ +5V + 0.1µ B A GND 5 ...

Page 4

... Receiver Output High Voltage V Receiver Output Low Voltage V Three-State (high impedance) I OZR Receiver Output Current 4 ISL8487, ISL81483, ISL81487 Thermal Information Thermal Resistance (Typical, Note SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . +0.5V PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . Maximum Junction Temperature (Plastic Package 150 Maximum Storage Temperature Range . . . . . . . . . . -65 +0.5V) Maximum Lead Temperature (Soldering 10s) ...

Page 5

... SKD Receiver Enable to Output High Receiver Enable to Output Low Receiver Disable from Output High Receiver Disable from Output Low Maximum Data Rate f MAX SWITCHING CHARACTERISTICS (ISL8487, ISL81483) Driver Input to Output Delay t PLH Driver Output Skew t SKEW Driver Differential Rise or Fall Time ...

Page 6

... SHDN. 7. The ISL8487 and ISL81483 are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See “ ...

Page 7

... SIGNAL GENERATOR FIGURE 2A. TEST CIRCUIT FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES SIGNAL Y GENERATOR C L (SHDN) for ISL8487 and ISL81483 only. PARAMETER OUTPUT Y/Z 0 (Note Y/Z 0 (Note Y/Z 1 (Note 7) ...

Page 8

... EMI. Driver outputs are three-statable via the active high DE input. The ISL8487 and ISL81483 driver outputs are slew rate limited to minimize EMI, and to minimize reflections in unterminated or improperly terminated networks. Data rate on these slew rate limited versions is a maximum of 250kbps ...

Page 9

... Note that receiver and driver enable times increase when enabling from shutdown. Refer to Notes 5-9, at the end of the Electrical Specification table, for more information 5V ISL8487, ISL81483 and ISL81487; Unless Otherwise Specified CC A 3.6 3.4 3.2 2.8 2.6 2.4 2 ...

Page 10

... PHLY 16 -40 0 -25 25 TEMPERATURE ( FIGURE 12. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL81487) 10 ISL8487, ISL81483, ISL81487 5V ISL8487, ISL81483 and ISL81487; Unless Otherwise Specified (Continued 350 ISL81487E 300 ISL8487E, ISL81487L 250 200 150 HIGH 100 250 200 ...

Page 11

... FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL81487) Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 518 PROCESS: Si Gate CMOS 11 ISL8487, ISL81483, ISL81487 5V ISL8487, ISL81483 and ISL81487; Unless Otherwise Specified (Continued 54Ω 100pF FIGURE 15. DRIVER AND RECEIVER WAVEFORMS, = 54Ω ...

Page 12

... Dambar protrusions shall not exceed 0.010 inch (0.25mm the maximum number of terminal positions. 10. Corner leads (1, N, N/2 and N for E8.3, E16.3, E18.3, E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch (0.76 - 1.14mm). 12 ISL8487, ISL81483, ISL81487 E8.3 8 LEAD DUAL-IN-LINE PLASTIC PACKAGE SYMBOL E A2 ...

Page 13

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 13 ISL8487, ISL81483, ISL81487 M8.15 (JEDEC MS-012-AA ISSUE C) 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC ...

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