ISL81487L Intersil Corporation, ISL81487L Datasheet

ISL81487L

Manufacturer Part Number

ISL81487L

Description

15kV ESD Protected/ 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers

Manufacturer

Intersil Corporation

Datasheet

1.ISL81487L.pdf (14 pages)

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Low Power, High Speed or Slew Rate

Limited, RS-485/RS-422 Transceivers

These Intersil RS-485/RS-422 devices are ESD protected,

fractional unit load (UL), BiCMOS, 5V powered, single

transceivers that meet both the RS-485 and RS-422

standards for balanced communication. Each driver output/

receiver input is protected against

without latch-up. Unlike competitive devices, this Intersil

family is specified for 10% tolerance supplies (4.5V to 5.5V).

All devices 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). 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 ISL8487E and ISL81487L

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

ISL81487E, 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.

ISL81487E

ISL81487L

NUMBER

ISL8487E

15kV ESD Protected, 1/8 Unit Load, 5V,

PART

HALF/FULL

DUPLEX

Half

ALLOWED ON BUS

NO. OF DEVICES

256

15kV ESD strikes,

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

ISL8487E, ISL81487L, ISL81487E

Features

• RS-485 I/O Pin ESD Protection

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

• Specified for 10% Tolerance Supplies

• High Data Rate Version (ISL81487E) . . . . . up to 5Mbps

• Slew Rate Limited Versions for Error Free Data

• Low Current Shutdown Mode (Except ISL81487E). . . . 1nA

• Low Quiescent Supply Current:

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

• Three State Rx and Tx Outputs

• 30ns Propagation Delays, 5ns Skew (ISL81487E)

• Half Duplex Pinouts

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

• Current Limiting and Thermal Shutdown for driver

• Pin Compatible Replacements for: MAX487E,

Applications

• High Node Count Networks

• Automated Utility Meter Reading Systems

• Factory Automation

• Security Networks

• Building Environmental Control Systems

• Industrial/Process Control Networks

- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM

Transmission (ISL8487E, ISL81487L) . . . . .up to 250kbps

- ISL8487E, ISL81487L . . . . . . . . . . . . . . . 120

- ISL81487E . . . . . . . . . . . . . . . . . . . . . . . . 300

Overload Protection

(ISL8487E); LTC1487, ADM1487 (ISL81487L);

MAX1487E, ST485ER (ISL81487E)

DRIVER ENABLE?

December 2003

RECEIVER/

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

Yes

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

QUIESCENT

100

250

(µA)

. . . . . . . . . . . . . ±

SHUTDOWN?

LOW POWER

Yes

FN6051.2

15kV HBM

A (Max.)

COUNT

Related parts for ISL81487L

ISL81487L Summary of contents

Page 1

... Slew Rate Limited Versions for Error Free Data Transmission (ISL8487E, ISL81487L .up to 250kbps • Low Current Shutdown Mode (Except ISL81487E 1nA • Low Quiescent Supply Current: - ISL8487E, ISL81487L . . . . . . . . . . . . . . . 120 - ISL81487E . . . . . . . . . . . . . . . . . . . . . . . . 300 • -7V to +12V Common Mode Input Voltage Range • Three State Rx and Tx Outputs • ...

Page 2

... HBM ESD Protected, RS-485/422 level, inverting receiver input and inverting driver output. Pin is an input ( pin is B/Z an output ( System power supply input (4.5V to 5.5V ISL8487E, ISL81487L, ISL81487E Truth Tables B/Z 6 A/Y 5 GND *Shutdown Mode for ISL8487E, ISL81487L (see Note 7) PKG. DWG. # M8.15 E8.3 M8.15 E8.3 M8.15 *Shutdown Mode for ISL8487E, ISL81487L (see Note 7) E8.3 FUNCTION TRANSMITTING INPUTS ...

Page 3

... Typical Operating Circuits + GND 5 3 ISL8487E, ISL81487L, ISL81487E ISL8487E, ISL81487L, ISL81487E + 0.1µ +5V + 0.1µ B A GND 5 ...

Page 4

... Receiver Output Low Voltage V Three-State (high impedance) I OZR Receiver Output Current Receiver Input Resistance R 4 ISL8487E, ISL81487L, ISL81487E 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

... Maximum Data Rate f MAX Time to Shutdown t SHDN Driver Enable from Shutdown to t ZH(SHDN) Output High Driver Enable from Shutdown to t ZL(SHDN) Output Low 5 ISL8487E, ISL81487L, ISL81487E = 4.5V to 5.5V; Unless Otherwise Specified 5V (Note 2) (Continued TEST CONDITIONS ISL81487E, DI ...

Page 6

... SHDN. 7. The ISL8487E and ISL81487L 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 ISL8487E and ISL81487L only. PARAMETER OUTPUT Y/Z 0 (Note Y/Z 0 (Note Y/Z 1 (Note 7) ...

Page 8

... Test Circuits and Waveforms RE B +1. SIGNAL GENERATOR FIGURE 4A. TEST CIRCUIT SIGNAL A GENERATOR (SHDN) for ISL8487E and ISL81487L only. PARAMETER (Note (Note (Note 7) 0 ZH(SHDN) t (Note 7) 0 ZL(SHDN) FIGURE 5A. TEST CIRCUIT ...

Page 9

... EMI. Driver outputs are three-statable via the active high DE input. The ISL8487E and ISL81487L 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 10

... HIGH 100 100Ω DIFF 3 2 -40 - TEMPERATURE ( C) TEMPERATURE ISL81487E ISL81487E GND ISL8487E, ISL81487L ISL8487E, ISL81487L GND GND -40 - TEMPERATURE ( C) FIGURE 9. SUPPLY CURRENT vs TEMPERATURE R = 54Ω DIFF ...

Page 11

... DI R DIFF 5 RO ISL81487L 0 5 ISL8487E B A TIME (400ns/DIV) FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL8487E, ISL81487L) 11 ISL8487E, ISL81487L, ISL81487E 5V ISL8487E, ISL81487L and ISL81487E Unless Otherwise Specified (Continued) 250 200 t PLHY t PLHZ 150 100 t ...

Page 12

... FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL81487E) Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 518 PROCESS: Si Gate CMOS 12 ISL8487E, ISL81487L, ISL81487E 5V ISL8487E, ISL81487L and ISL81487E Unless Otherwise Specified (Continued) = 54Ω 100pF FIGURE 17 ...

Page 13

... 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). 13 ISL8487E, ISL81487L, ISL81487E E8.3 8 LEAD DUAL-IN-LINE PLASTIC PACKAGE SYMBOL E A2 ...

Page 14

... 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 14 ISL8487E, ISL81487L, ISL81487E M8.15 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC M ...

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