intersil ISL81387, ISL41387 DATA SHEET

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ISL81387, ISL41387

Data Sheet December 20, 2005

±15kV ESD Protected, Dual Protocol

(RS-232/RS-485) Transceivers

These devices are BiCMOS interface ICs that are user configured as either a single RS-422/485 differential transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver.

In RS-232 mode, the on-board charge pump generates RS-232 compliant ±5V Tx output levels, from a supply as low as 4.5V. Four small 0.1µF capacitors are required for the charge pump. The transceivers are RS-232 compliant, with the Rx inputs handling up to ±25V, and the Tx outputs handling ±12V.

In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The RS-485 receiver features "full failsafe" operation, so the Rx output remains in a high state if the inputs are open or shorted together. The RS-485 transmitter supports up to three data rates, two of which are slew rate limited for problem free communications. The charge pump disables in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors.

Both RS-232/485 modes feature loopback and shutdown functions. The loopback mode internally connects the Tx outputs to the corresponding Rx input, which facilitates the implementation of board level self test functions. The outputs remain connected to the loads during loopback, so connection problems (e.g., shorted connectors or cables) can be detected. The shutdown mode disables the Tx and Rx outputs, disables the charge pump if in RS-232 mode, and places the IC in a low current (20µA) mode.

The ISL41387 is a QFN packaged device that offers additional functionality, including a lower speed and edge rate option (115kbps) for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply voltage pin (V

) that sets the VOH level of logic outputs, and the

switching points of logic inputs, to be compatible with another supply voltage in mixed voltage systems. The QFN's choice of active high or low Rx enable pins increases design flexibility, allowing Tx/Rx direction control via a single signal by connecting DEN and RXEN

together.

FN6201.1

Features

• User Selectable RS-232 or RS-485/422 Interface Port (Two RS-232 Transceivers or One RS-485/422 Transceiver)

• ±15kV (HBM) ESD Protected Bus Pins (RS-232 or RS-485)

• Flow-Through Pinouts Simplify Board Layouts

• Pb-Free Plus Anneal Available (RoHS Compliant)

• Large (2.7V) Differential V

for Improved Noise

OUT

Immunity in RS-485/422 Networks

• Full Failsafe (Open/Short) Rx in RS-485/422 Mode

• Loopback Mode Facilitates Board Self Test Functions

• User Selectable RS-485 Data Rates . . . . . . . . . . 20Mbps

- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps

- Slew Rate Limited (ISL41387 Only) . . . . . . . . . 115kbps

• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 650kbps

• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .35µA

• QFN Package Saves Board Space (ISL41387 Only)

• Logic Supply Pin (V

) Eases Operation in Mixed Supply

Systems (ISL41387 Only)

Applications

• Gaming Applications (e.g., Slot machines)

• Single Board Computers

• Factory Automation

• Security Networks

• Industrial/Process Control Networks

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

• Point of Sale Equipment

For a dual port version of these devices, please see the ISL81334/ISL41334 data sheet.

TABLE 1. SUMMARY OF FEATURES

PART

NUMBER

ISL81387 1 20 Ld SOIC, 20 Ld SSOP 20M, 460k 650 NO H YES

ISL41387 1 40 Ld QFN (6 x 6mm) 20M, 460k, 115k 650 YES BOTH YES

NO. OF PORTS

PACKAGE OPTIONS

RS-485 DATA

RATE (bps)

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

1-888-INTERSIL or 1-888-468-3774

RS-232 DATA

RATE (kbps)

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

PIN?

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

ACTIVE H or L

Rx ENABLE?

LOW POWER SHUTDOWN?

ISL81387, ISL41387

Ordering Information

PART NUMBER (NOTE) PART MARKING TEMP. RANGE (°C) PACKAGE (Pb-Free) PKG. DWG. #

ISL81387IAZ 81387IAZ -40 to 85 20 Ld SSOP M20.209

ISL81387IAZ-T 81387IAZ -40 to 85 20 Ld SSOP Tape and Reel M20.209

ISL81387IBZ ISL81387IBZ -40 to 85 20 Ld SOIC M20.3

ISL81387IBZ-T ISL81387IBZ -40 to 85 20 Ld SOIC Tape and Reel M20.3

ISL41387IRZ 41387IRZ -40 to 85 40 Ld QFN L40.6x6

ISL41387IRZ-T 41387IRZ -40 to 85 40 Ld QFN Tape and Reel L40.6x6

NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

Pinouts

ISL81387 (SOIC, SSOP)

TOP VIEW

C1+

C1V+

485/232

DEN

GND

1 2 3

7 8 9

C2+ C2-

/SLEW

13 12

RXEN

V-

V+

ISL41387 (QFN)

TOP VIEW

11 12 13 14 15 16 17 18 19 20

485/232

C1-

C1+

C2+

39 38 37 36 35 34 33 32 31

DEN

SPB

GND

C2-NCV

GND

RXEN

V-

RXEN

DZ/SLEW

FN6201.1

December 20, 2005

ISL81387, ISL41387

TABLE 2. ISL81387 FUNCTION TABLE

INPUTS

ON RXEN DEN SLEW R

RECEIVER

OUTPUTS DRIVER OUTPUTS

DRIVER

SPEED

(Mbps)

0 1 0 0 N.A. High-Z High-Z High-Z High-Z - ON OFF RS-232

0 1 0 1 N.A. High-Z High-Z ON ON 0.46 ON OFF RS-232

0 1 1 0 N.A. ON ON High-Z High-Z - ON OFF RS-232

0 1 1 1 N.A. ON ON ON ON 0.46 ON OFF RS-232

0 0 0 1 N.A. High-Z High-Z ON High-Z 0.46 ON OFF RS-232

0 0 1 0 N.A. High-Z ON ON High-Z 0.46 ON OFF RS-232

0 0 1 1 N.A. ON ON ON ON 0.46 ON ON RS-232

X 0 0 0 X High-Z High-Z High-Z High-Z - OFF OFF Shutdown

1 1 0 0 X High-Z High-Z High-Z High-Z - OFF OFF RS-485

1 X 0 1 1/0 High-Z High-Z ON ON 20/0.46 OFF OFF RS-485

1 X 1 0 X ON High-Z High-Z High-Z - OFF OFF RS-485

1 1 1 1 1/0 ON High-Z ON ON 20/0.46 OFF OFF RS-485

1 0 1 1 1/0 ON High-Z ON ON 20/0.46 OFF ON RS-485

NOTES:

1. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN are high.

2. Loopback is enabled when ON = 0, and DEN = RXEN = 1.

CHARGE

PUMPS

(NOTE 1)

LOOPBACK

(NOTE 2) MODE485/232

ISL81387 Truth Tables

RS-232 TRANSMITTING MODE

INPUTS (ON = 1) OUTPUTS

485/232

010011

010110

011001

011100

0 0 X X High-Z High-Z

485/232

010011

010110

011001

011100

0 1 Open Open 1 1

0 0 X X High-Z High-Z

DEN D

RS-232 RECEIVING MODE

INPUTS (ON = 1) OUTPUT

RXEN A B R

RS-485 TRANSMITTING MODE

INPUTS (ON = 1) OUTPUTS

DATA RATE

485/232

DEN DYSLEW Y Z

(Mbps)

110110 20

111101 20

110010 0.46

111001 0.46

1 0 X X High-Z High-Z -

RS-485 RECEIVING MODE

INPUTS (ON = 1) OUTPUT

485/232

RXEN B-A R

11 ≥ -40mV 1 High-Z

11 ≤ -200mV 0 High-Z

1 1 Open or Shorted together 1 High-Z

1 0 X High-Z High-Z

FN6201.1

December 20, 2005

ISL81387, ISL41387

TABLE 3. ISL41387 FUNCTION TABLE

RECEIVER

OUTPUTS

INPUTS

RXEN

and/or

RXEN

DEN SLEW SPB R

0 1 1 and 0 0 N.A. N.A. High-Z High-Z High-Z High-Z - ON RS-232

0 1 1 and 0 1 N.A. N.A. High-Z High-Z ON ON 0.46 ON RS-232

0 1 0 or 1 0 N.A. N.A. ON ON High-Z High-Z - ON RS-232

0 1 0 or 1 1 N.A. N.A. ON ON ON ON 0.46 ON RS-232

0 0 1 and 0 1 N.A. N.A. High-Z High-Z ON High-Z 0.46 ON RS-232

0 0 0 or 1 0 N.A. N.A. High-Z ON ON High-Z 0.46 ON RS-232

0 0 0 or 1 1 N.A. N.A. ON ON ON ON 0.46 ON RS-232 (Note 4)

X 0 1 and 0 0 X X High-Z High-Z High-Z High-Z - OFF Shutdown

1 1 1 and 0 0 X X High-Z High-Z High-Z High-Z - OFF RS-485

1 X 1 and 0 1 0 1/0 High-Z High-Z ON ON 0.46/0.115 OFF RS-485

1 X 1 and 0 1 1 X High-Z High-Z ON ON 20 OFF RS-485

1 X 0 or 1 0 X X ON High-Z High-Z High-Z - OFF RS-485

1 1 0 or 1 1 0 1/0 ON High-Z ON ON 0.46/0.115 OFF RS-485

1 1 0 or 1 1 1 X ON High-Z ON ON 20 OFF RS-485

1 0 0 or 1 1 0 1/0 ON High-Z ON ON 0.46/0.115 OFF RS-485 (Note 4)

1 0 0 or 1 1 1 X ON High-Z ON ON 20 OFF RS-485 (Note 4)

NOTES:

3. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN is high, or RXEN

4. Loopback is enabled when ON = 0, and DEN = 1, and (RXEN = 1 or RXEN

= 0).

DRIVER

OUTPUTS

is low.

DRIVER

DATA RATE

(Mbps)

CHARGE

PUMPS

(NOTE 3) MODE 485/232

ISL41387 Truth Tables

RS-232 TRANSMITTING MODE

INPUTS (ON=1) OUTPUTS

485/232

DEN D

0 1 0011

0 1 0110

0 1 1001

0 1 1100

0 0 X X High-Z High-Z

RS-232 RECEIVING MODE

INPUTS (ON=1) OUTPUT

485/232

RXEN and/or A B R

00 or 10011

00 or 10110

00 or 11001

00 or 11100

0 0 or 1 Open Open 1 1

0 1 and 0 X X High-Z High-Z

RS-485 TRANSMITTING MODE

INPUTS (ON=1) OUTPUTS DATA

485/232

DEN SLEW SPB D

YZMbps

1 1 0 0 0/1 1/0 0/1 0.115

1 1 0 1 0/1 1/0 0/1 0.460

1 1 1 X 0/1 1/0 0/1 20

1 0 X X X High-Z High-Z -

RS-485 RECEIVING MODE

INPUTS (ON=1) OUTPUT

485/232

RXEN and/or B-A R

10 or 1 ≥ -40mV 1 High-Z

10 or 1≤ -200mV 0 High-Z

1 0 or 1 Open or Shorted

1 High-Z

together

1 1 and 0 X High-Z High-Z

FN6201.1

December 20, 2005

ISL81387, ISL41387

Pin Descriptions

PIN MODE FUNCTION

485/232

DEN BOTH Driver output enable. The driver outputs, Y and Z, are enabled by bringing DEN high. They are high impedance when DEN

GND BOTH Ground connection.

NC BOTH No Connection.

ON BOTH In RS-232 mode only, ON high enables the charge pumps. ON low, with DEN and RXEN low (and RXEN

RXEN BOTH Receiver output enable. Rx is enabled when RXEN is high; Rx is high impedance when RXEN is low and, if using the QFN

RXEN

SLEW RS-485 Slew rate control. With the SLEW pin high, the drivers run at the maximum slew rate (20Mbps). With the SLEW pin low, the

SPB RS-485 Speed control. Works in conjunction with the SLEW pin to select the 20Mbps, 460kbps or 115kbps RS-485 data rate.

C1+ RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.

C1- RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.

C2+ RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.

C2- RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.

V+ RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed in RS-485 Mode.

BOTH Interface Mode Select input. High for RS-485 Mode and low for RS-232 Mode.

is low.

high if QFN), turns off the charge pumps (in RS-232 mode), and in either mode places the device in low power shutdown. In both modes, when ON is low, and DEN is high, and RXEN is high or RXEN

package, RXEN

is high. When using the QFN and the active high Rx enable function, RXEN should be high or floating.

is low, loopback is enabled.

BOTH Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high and RXEN

is low. (i.e., to use active low Rx enable function, tie RXEN to GND). For single signal Tx/Rx direction control, connect RXEN to DEN. Internally pulled high. (QFN only)

BOTH System power supply input (5V).

BOTH Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. (QFN only)

A RS-232 Receiver input with ±15kV ESD protection. A low on A forces R

high; A high on A forces RA low.

RS-485 Inverting receiver input with ±15kV ESD protection.

B RS-232 Receiver input with ±15kV ESD protection. A low on B forces R

high; A high on B forces RB low.

RS-485 Noninverting receiver input with ±15kV ESD protection.

RS-232 Driver input. A low on DY forces output Y high. Similarly, a high on DY forces output Y low.

RS-485 Driver input. A low on D

RS-232 Driver input. A low on DZ forces output Z high. Similarly, a high on DZ forces output Z low.

forces output Y high and output Z low. Similarly, a high on DY forces output Y low and output Z high.

drivers run at a reduced slew rate (460kbps). On the QFN version, works in conjunction with SPB to select one of three RS-485 data rates. Internally pulled high in RS-485 mode.

Internally pulled high. (QFN only)

RS-232 Receiver output.

RS-485 Receiver output: If B > A by at least -40mV, R

is high; If B < A by -200mV or more, RA is low; RA = High if A and B are

unconnected (floating) or shorted together (i.e., full fail-safe).

RS-232 Receiver output.

RS-485 Not used. Output is high impedance, and unaffected by RXEN

and RXEN.

Y RS-232 Driver output with ±15kV ESD protection.

RS-485 Inverting driver output with ±15kV ESD protection.

Z RS-232 Driver output with ±15kV ESD protection.

RS-485 Noninverting driver output with ±15kV ESD protection.

V- RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed in RS-485 Mode.

FN6201.1

December 20, 2005

Typical Operating Circuit

RS-232 MODE WITHOUT LOOPBACK

ISL81387, ISL41387

RS-232 MODE WITH LOOPBACK

+5V

0.1µF

C1+

C1-

C2+

C2-

5kΩ

516

5kΩ

DEN

813

485/232

V+

RXEN

V-

0.1µF

GND

NOTE: PINOUT FOR SOIC AND SSOP

+5V

0.1µF

C1+

C1-

C2+

C2-

5kΩ

LB Rx

DEN

485/232

GND

NOTE: PINOUT FOR SOIC AND SSOP

RXEN

V+

V-

0.1µF

RS-485 MODE WITHOUT LOOPBACK

+5V

0.1µF

C1+

C1-

C2+

C2-

DEN

813

485/232

GND

RXEN

V+

V-

RS-485 MODE WITH LOOPBACK

+5V

0.1µF

SLEW

C1+

C1-

C2+

C2-

DEN

485/232

LB Rx

GND

V+

V-

RXEN

0.1µF

SLEW

NOTE: PINOUT FOR SOIC AND SSOP

FN6201.1

December 20, 2005

ISL81387, ISL41387

Absolute Maximum Ratings (T

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

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

Input Voltages

All Except A,B (non-QFN Package) . . . . . . -0.5V to (V

All Except A,B (QFN Package). . . . . . . . . . . -0.5V to (V

Input/Output Voltages

A, B (Any Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V

Y, Z (Any Mode, Note 5) . . . . . . . . . . . . . . . . . . . -12.5V to +12.5V

, RB (non-QFN Package). . . . . . . . . . . . -0.5V to (VCC + 0.5V)

, RB (QFN Package) . . . . . . . . . . . . . . . . -0.5V to (VL + 0.5V)

Output Short Circuit Duration

Y, Z , R

, RB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite

= 25°C) Thermal Information

Thermal Resistance (Typical, Note 6)

20 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 65

20 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 60

+ 0.5V) + 0.5V)

40 Ld QFN Package. . . . . . . . . . . . . . . . . . . . . . . . . 32

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

Maximum Storage Temperature Range. . . . . . . . . . -65°C to 150°C

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

(SOIC and SSOP - Lead Tips Only)

Operating Conditions

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 85°C

(°C/W)

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table

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.

NOTES:

5. One output at a time, I

6. QFN θ

is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features.

for other packages is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tec h B r i e f

≤ 100mA for ≤ 10 mins.

OUT

TB379 and Tech Brief TB389 for details.

Electrical Specifications Test Conditions: V

Typicals are at V

= 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only), Unless Otherwise Specified.

= 5V, TA = 25°C (Note 7)

TEMP

PARAMETER SYMBOL TEST CONDITIONS

DC CHARACTERISTICS - RS-485 DRIVER (485/232

Driver Differential V

(no load) V

OUT

(with load) V

OUT

OD1

OD2

R = 50Ω (RS-422) (Figure 1) Full 2.5 3.1 - V

= VCC)

(°C) MIN TYP MAX UNITS

Full - - V

R = 27Ω (RS-485) (Figure 1) Full 2.2 2.7 5 V

Change in Magnitude of Driver Differential V Complementary Output States

Driver Common-Mode V

OUT

for

OUT

Change in Magnitude of Driver Common-Mode V

OUT

for

∆V

OD3

RD = 60Ω, R = 375Ω, VCM = -7V to 12V (Figure 1) Full 2 2.7 5 V

R = 27Ω or 50Ω (Figure 1) Full - 0.01 0.2 V

R = 27Ω or 50Ω (Figure 1) (Note 11) Full - - 3.1 V

R = 27Ω or 50Ω (Figure 1) (Note 11) Full - 0.01 0.2 V

Complementary Output States

Driver Short-Circuit Current, V

= High or Low

OUT

Driver Three-State Output Leakage Current (Y, Z)

DC CHARACTERISTICS - RS-232 DRIVER (485/232

Driver Output Voltage Swing V Driver Output Short-Circuit Current I

-7V ≤ (VY or VZ) ≤ 12V (Note 9) Full 35 - 250 mA

Outputs Disabled, V

= 0V or 5.5V

= 12V Full - - 150 µA

OUT

= -7V Full -150 - - µA

OUT

= 0V)

All T

OUT

Loaded with 3kΩ to Ground Full ±5.0 +6/-7 - V

OUTS

= 0V Full -60 25/-35 60 mA

DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS)

Input High Voltage V

VL = VCC if QFN Full 2 1.6 - V

IH1

VL = 3.3V (QFN Only) Full 2 1.2 - V

IH2

VL = 2.5V (QFN Only) Full 1.5 1 - V

IH3

FN6201.1

December 20, 2005

ISL81387, ISL41387

Electrical Specifications Test Conditions: V

Typicals are at V

= 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only), Unless Otherwise Specified.

= 5V, TA = 25°C (Note 7) (Continued)

TEMP

PARAMETER SYMBOL TEST CONDITIONS

Input Low Voltage V

Input Current I

IN1

IN2

VL = VCC if QFN Full - 1.4 0.8 V

IL1

VL = 3.3V (QFN Only) Full - 1 0.7 V

IL2

VL = 2.5V (QFN Only) Full - 0.8 0.5 V

IL3

Except SLEW, RXEN (QFN), and SPB (QFN) Full -2 - 2 µA

SLEW (Note 12), RXEN (QFN), and SPB (QFN) Full -25 - 25 µA

DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (485/232

Receiver Differential Threshold Voltage

Receiver Input Hysteresis ∆V

Receiver Input Current (A, B) I

-7V ≤ VCM ≤ 12V, Full Failsafe Full -0.2 - -0.04 V

VCM = 0V 25 - 35 - mV

VCC = 0V or 4.5 to 5.5V VIN = 12V Full - - 0.8 mA

= VCC)

(°C) MIN TYP MAX UNITS

VIN = -7V Full -0.64 - - mA

Receiver Input Resistance R

-7V ≤ VCM ≤ 12V, VCC = 0 (Note 10), or

4.5V ≤ V

≤ 5.5V

Full 15 - - kΩ

DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (485/232 = GND)

Receiver Input Voltage Range V Receiver Input Threshold V

Receiver Input Hysteresis ∆V Receiver Input Resistance R

VIN = ±15V, VCC Powered Up (Note 10) Full 3 5 7 kΩ

Full -25 - 25 V

Full - 1.4 0.8 V

Full 2.4 1.9 - V

25 - 0.5 - V

DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE)

Receiver Output High Voltage V

Receiver Output Low Voltage V

Receiver Short-Circuit Current I

Receiver Three-State Output Current

OH1IO

OH2IO

OH3IO

OSR

OZR

= -2mA (VL = VCC if QFN) Full 3.5 4.6 - V

= -650µA, VL = 3V, QFN Only Full 2.6 2.9 - V

= -500µA, VL = 2.5V, QFN Only Full 2 2.4 - V

IO = 3mA Full - 0.1 0.4 V

0V ≤ VO ≤ V

Full 7 - 85 mA

Output Disabled, 0V ≤ VO ≤ VCC (or VL for QFN) Full - - ±10 µA

POWER SUPPLY CHARACTERISTICS

No-Load Supply Current, Note 8 I

Shutdown Supply Current I

CC232

CC485

SHDN232

SHDN485

485/232 = 0V, ON = V

485/232 = VCC, ON = V

ON = DEN = RXEN = 0V (RXEN

= SPB = V

if QFN)

ON = DEN = RXEN = SLEW = 0V (RXEN

= VCC, SPB = 0V if QFN)

Full - 3.7 7 mA

Full - 1.6 5 mA

Full - 5 30 µA

Full - 35 60 µA

ESD CHARACTERISTICS

Bus Pins (A, B, Y, Z) Any Mode Human Body Model 25 - 15 - kV

All Other Pins Human Body Model 25 - 4 - kV

RS-232 DRIVER and RECEIVER SWITCHING CHARACTERISTICS (485/232

Driver Output Transition Region

Slew Rate

SR R

=3kΩ, Measured From 3V to

-3V or -3V to 3V

= 0V, ALL VERSIONS AND SPEEDS)

CL ≥ 15pF Full - 18 30 V/µs

≤ 2500pF Full 4 12 - V/µs

FN6201.1

December 20, 2005

ISL81387, ISL41387

Electrical Specifications Test Conditions: V

Typicals are at V

= 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only), Unless Otherwise Specified.

= 5V, TA = 25°C (Note 7) (Continued)

TEMP

PARAMETER SYMBOL TEST CONDITIONS

Driver Output Transition Time t

Driver Propagation Delay t

Driver Propagation Delay Skew t

Driver Enable Time t

Driver Disable Time t

Driver Enable Time from Shutdown t

DPHL

DPLH

DSKEWtDPHL

DEN

DDIS

DENSDVOUT

Driver Maximum Data Rate DR

Receiver Propagation Delay t

Receiver Propagation Delay Skew t

RPHL

RPLH

RSKEWtRPHL

Receiver Maximum Data Rate DR

, t

RL=3kΩ, CL = 2500pF, 10% - 90% Full 0.22 1.2 3.1 µs

RL=3kΩ, C

RL=5kΩ, Measured at V

= 1000pF (Figure 6) Full - 1 2 µs

- t

(Figure 6) Full - 240 400 ns

DPLH

= ±3V 25 - 500 - ns

OUT

= ±3.0V (Note 13) 25 - 20 - µs

RL=3kΩ, CL= 1000pF, One Transmitter

Switching

= 15pF (Figure 7) Full - 50 120 ns

- t

(Figure 7) Full - 10 40 ns

RPLH

CL= 15pF Full 0.46 2 - Mbps

(°C) MIN TYP MAX UNITS

Full - 1.2 2 µs

25 - 800 - ns

Full 460 650 - kbps

Full - 40 120 ns

RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), 485/232 = VCC, SLEW = VCC, ALL VERSIONS)

Driver Differential Input to Output Delay

Driver Output Skew t

Driver Differential Rise or Fall Time tR, t

Driver Enable to Output Low t

Driver Enable to Output High t

Driver Disable from Output Low t

Driver Disable from Output High t

Driver Enable from Shutdown to Output Low

Driver Enable from Shutdown to Output High

Driver Maximum Data Rate f

RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps), 485/232

, t

DLH

DHLRDIFF

SKEW

ZL(SHDN)RL

ZH(SHDN)RL

MAX

= 54Ω, CL = 100pF (Figure 2) Full 15 30 50 ns

= 54Ω, CL = 100pF (Figure 2) Full - 0.5 10 ns

DIFF

= 54Ω, CL = 100pF (Figure 2) Full 3 11 20 ns

DIFF

CL = 100pF, SW = VCC (Figure 3) Full - 27 60 ns

CL = 100pF, SW = GND (Figure 3) Full - 24 60 ns

CL = 15pF, SW = VCC (Figure 3) Full - 31 60 ns

CL = 15pF, SW = GND (Figure 3) Full - 24 60 ns

= 500Ω, CL = 100pF, SW = VCC (Figure 3)

Full - 65 250 ns

(Note 13)

= 500Ω, CL = 100pF, SW = GND (Figure 3)

Full - 152 250 ns

(Note 13)

= 54Ω, CL = 100pF (Figure 2) Full - 30 - Mbps

DIFF

= VCC, SLEW = SPB (QFN Only) = GND, ALL

VERSIONS)

Driver Differential Input to Output Delay

Driver Output Skew t

Driver Differential Rise or Fall Time t

Driver Enable to Output Low t

Driver Enable to Output High t

Driver Disable from Output Low t

Driver Disable from Output High t

Driver Enable from Shutdown to Output Low

Driver Enable from Shutdown to Output High

Driver Maximum Data Rate f

, t

DLH

DHLRDIFF

SKEW

, t

ZL(SHDN)RL

ZH(SHDN)RL

MAX

= 54Ω, CL = 100pF (Figure 2) Full 200 490 1000 ns

= 54Ω, CL = 100pF (Figure 2) Full - 110 400 ns

DIFF

= 54Ω, CL = 100pF (Figure 2) Full 300 600 1100 ns

DIFF

CL = 100pF, SW = VCC (Figure 3) Full - 30 300 ns

CL = 100pF, SW = GND (Figure 3) Full - 128 300 ns

CL = 15pF, SW = VCC (Figure 3) Full - 31 60 ns

CL = 15pF, SW = GND (Figure 3) Full - 24 60 ns

= 500Ω, CL = 100pF, SW = VCC (Figure 3)

Full - 65 500 ns

(Note 13)

= 500Ω, CL = 100pF, SW = GND (Figure 3)

Full - 255 500 ns

(Note 13)

= 54Ω, CL = 100pF (Figure 2) Full - 2000 - kbps

DIFF

FN6201.1

December 20, 2005

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