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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
Data Sheet August 2004 FN6052.3
3.3V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
These Intersil RS-485/RS-422 devices are BiCMOS 3.3V 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 (3V to 3.6V). The ISL83483 and ISL83488 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 10Mbps are achievable by using the ISL83485, ISL83490, or ISL83491, which feature higher slew rates. Logic inputs (e.g., DI and DE) accept signals in excess of 5.5V, making them compatible with 5V logic families. Receiver (Rx) inputs feature a "fail-safe if open" design, which ensures a logic high output if Rx inputs are floating. All devices present a "single unit load" to the RS-485 bus, which allows up to 32 transceivers on the network. 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 ISL83488, ISL83490, ISL83491 are configured for full duplex (separate Rx input and Tx output pins) applications. The ISL83488 and ISL83490 are offered in space saving 8 lead packages for applications not requiring Rx and Tx output disable functions (e.g., point-to-point and RS-422). Half duplex configurations (ISL83483, ISL83485) multiplex the Rx inputs and Tx outputs to provide transceivers with Rx and Tx disable functions in 8 lead packages.
Features
* Operate from a Single +3.3V Supply (10% Tolerance) * Interoperable with 5V Logic * High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 10Mbps * Single Unit Load Allows up to 32 Devices on the Bus * Slew Rate Limited Versions for Error Free Data Transmission (ISL83483, ISL83488) . . . . . .up to 250kbps * Low Current Shutdown Mode (ISL83483, ISL83485, ISL83491). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15nA * -7V to +12V Common Mode Input Voltage Range * Three State Rx and Tx Outputs (Except ISL83488, ISL83490) * 10ns Propagation Delay, 1ns Skew (ISL83485, ISL83490, ISL83491) * Full Duplex and Half Duplex Pinouts * Current Limiting and Thermal Shutdown for driver Overload Protection * Pb-free available
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 ISL83483 ISL83485 ISL83488 ISL83490 ISL83491 HALF/FULL DUPLEX Half Half Full Full Full DATA RATE (Mbps) 0.25 10 0.25 10 10 SLEW-RATE LIMITED? Yes No Yes No No RECEIVER/DRIVER ENABLE? Yes Yes No No Yes QUIESCENT ICC (mA) 0.65 0.65 0.65 0.65 0.65 LOW POWER SHUTDOWN? Yes Yes No No Yes PIN COUNT 8 8 8 8 14
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2003, 2004. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Pinouts
ISL83483, ISL83485 (PDIP, SOIC) TOP VIEW
RO 1 RE 2 DE 3 DI 4 D 8 7 6 5 VCC B/Z A/Y GND
ISL83488, ISL83490 (PDIP, SOIC) TOP VIEW
VCC 1 RO 2 DI 3 GND 4 D 8 7 6 5 A B Z Y
ISL83491 (PDIP, SOIC) TOP VIEW
NC 1 RO 2 RE 3 DE 4 DI 5 GND 6 GND 7 D R 14 VCC 13 VCC 12 A 11 B 10 Z 9Y 8 NC
R
R
Ordering Information
PART NO. (BRAND) ISL83483IB* (83483IB) ISL83483IBZ* (83483IB) (Note) ISL83483IP ISL83485IB* (83485IB) ISL83485IBZ* (83485IB) (Note) ISL83485IP ISL83488IB* (83488IB) ISL83488IBZ* (83488IB) (Note) ISL83488IP ISL83490IB* (83490IB) ISL83490IBZ* (83490IB) (Note) ISL83490IP ISL83491IB* ISL83491IBZ* (Note) ISL83491IP TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld PDIP 8 Ld SOIC 8 Ld SOIC (Pb-free) 8 Ld PDIP 14 Ld SOIC 14 Ld SOIC (Pb-free) 14 Ld PDIP PKG. DWG. # M8.15
Truth Tables
TRANSMITTING INPUTS RE M8.15 E8.3 M8.15 M8.15 E8.3 M8.15 M8.15 RE E8.3 M8.15 M8.15 E8.3 M14.15 M14.15 E14.3 0 0 0 1 1 RECEIVING INPUTS DE DE Half Duplex Full Duplex 0 0 0 0 1 X X X 0 1 A-B +0.2V -0.2V Inputs Open X X OUTPUT RO 1 0 1 High-Z * High-Z X X 0 1 DE 1 1 0 0 DI 1 0 X X Z 0 1 High-Z High-Z * OUTPUTS Y 1 0 High-Z High-Z *
NOTE: *Shutdown Mode for ISL83483, ISL83485, ISL83491
NOTE: *Shutdown Mode for ISL83483, ISL83485, ISL83491
*Add "-T" suffix to part number for tape and reel packaging. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B.
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Pin Descriptions
PIN RO RE DE DI GND A/Y B/Z A B Y Z VCC NC FUNCTION 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). Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low. 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. Ground connection. Noninverting receiver input and noninverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1. Inverting receiver input and inverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1. Noninverting receiver input. Inverting receiver input. Noninverting driver output. Inverting driver output. System power supply input (3V to 3.6V). No Connection.
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Typical Operating Circuits
ISL83483, ISL83485
+3.3V + 8 VCC 1 RO 2 RE 3 DE 4 DI R B/Z A/Y 7 6 RT RT 7 6 B/Z A/Y 0.1F 0.1F + 8 VCC D DI 4 DE 3 RE 2 R GND 5 GND 5 RO 1 +3.3V
D
ISL83488, ISL83490
+3.3V + 1 VCC A8 2 RO R B7 RT 5 6 Y Z D DI 3 0.1F 0.1F + 1 VCC +3.3V
Z6 3 DI D GND 4 Y5
RT
7B 8A GND 4 R
RO 2
ISL83491
+3.3V + 13, 14 VCC 2 RO 3 RE 4 DE Z 10 5 DI D GND 6, 7 Y9 RT 11 B 12 A GND 6, 7 R R A 12 B 11 0.1F RT 0.1F + 13,14 9Y 10 Z VCC D DI 5 DE 4 RE 3 RO 2 +3.3V
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Input Voltages DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +7V Input/Output Voltages A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC +0.5V) Short Circuit Duration Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Thermal Information
Thermal Resistance (Typical, Note 1)
JA (oC/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . 170 8 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . 140 14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 130 14 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . 105 Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC (SOIC- Lead Tips Only)
Operating Conditions
Temperature Range ISL834XXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
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: 1. JA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: VCC = 3V to 3.6V; Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = 25oC, Note 2 SYMBOL TEST CONDITIONS TEMP (oC) MIN TYP MAX UNITS
PARAMETER DC CHARACTERISTICS Driver Differential VOUT (no load) Driver Differential VOUT (with load)
VOD1 VOD2 RL = 100 (RS-422) (Figure 1A) RL = 54 (RS-485) (Figure 1A) RL = 60, -7V VCM 12V (Figure 1B) VOD
Full Full Full Full Full
2 1.5 1.5 -
2.7 2.3 2.6 0.01
VCC VCC 0.2
V V V V V
Change in Magnitude of Driver Differential VOUT for Complementary Output States Driver Common-Mode VOUT Change in Magnitude of Driver Common-Mode VOUT for Complementary Output States Logic Input High Voltage Logic Input Low Voltage Logic Input Current
RL = 54 or 100 (Figure 1A)
VOC VOC
RL = 54 or 100 (Figure 1A) RL = 54 or 100 (Figure 1A)
Full Full
-
1.8 0.01
3 0.2
V V
VIH VIL IIN1
DE, DI, RE DE, DI, RE DE, DI RE
Full Full Full Full VIN = 12V VIN = -7V Full Full Full Full Full Full Full 25 Full Full
2 -2 -25 -20 -1 -0.2 VCC 0.4 -
0.6 -0.3 14 -11 0.03 -0.01 50 -
0.8 2 25 1 -0.8 20 1 0.2 0.4
V V A A mA mA A A A A V mV V V
Input Current (A, B)
IIN2
DE = 0V, VCC = 0V or 3.6V
Output Leakage Current (Y, Z) (ISL83491) Output Leakage Current (Y, Z) in Shutdown Mode (ISL83491) Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage
IIN3
RE = 0V, DE = 0V, VCC = 0V or 3.6V VIN = 12V VIN = -7V
IIN3
RE = VCC, DE = 0V, VCC = 0V or 3.6V VIN = 12V VIN = -7V -7V VCM 12V VCM = 0V IO = -4mA, VID = 200mV IO = -4mA, VID = 200mV
VTH VTH VOH VOL
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
Electrical Specifications
Test Conditions: VCC = 3V to 3.6V; Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = 25oC, Note 2 (Continued) SYMBOL IOZR RIN ICC TEST CONDITIONS 0.4V VO 2.4V -7V VCM 12V DI = 0V or VCC DE = VCC, RE = 0V or VCC DE = 0V, RE = 0V Shutdown Supply Current (Except ISL83488 and ISL83490) Driver Short-Circuit Current, VO = High or Low Receiver Short-Circuit Current ISHDN IOSD1 IOSR DE = 0V, RE = VCC, DI = 0V or VCC DE = VCC, -7V VY or VZ 12V (Note 4) 0V VO VCC TEMP (oC) Full Full Full MIN -1 12 TYP 19 0.75 MAX 1 1.2 UNITS A k mA
PARAMETER Three-State (high impedance) Receiver Output Current Receiver Input Resistance No-Load Supply Current (Note 3)
Full Full Full Full
8
0.65 15 -
1 100 250 60
mA nA mA mA
DRIVER SWITCHING CHARACTERISTICS (ISL83485, ISL83490, ISL83491) Maximum Data Rate Driver Differential Output Delay Driver Differential Rise or Fall Time Driver Input to Output Delay Driver Output Skew Driver Enable to Output High (Except ISL83490) Driver Enable to Output Low (Except ISL83490) Driver Disable from Output High (Except ISL83490) Driver Disable from Output Low (Except ISL83490) Driver Enable from Shutdown to Output High (Except ISL83490) Driver Enable from Shutdown to Output Low (Except ISL83490) fMAX tDD tR, tF RDIFF = 60, CL = 15pF (Figure 2A) RDIFF = 60, CL = 15pF (Figure 2A) Full Full Full Full Full Full Full 25 Full tLZ RL = 110, CL = 50pF, SW = VCC (Figure 3) 25 Full tZH(SHDN) RL = 110, CL = 50pF, SW = GND (Figure 3), (Notes 7, 8) tZL(SHDN) RL = 110, CL = 50pF, SW = VCC (Figure 3), (Notes 7, 8) Full Full 12 1 3 6 15 10 5 10 1 45 45 65 65 115 115 35 20 35 8 90 90 80 110 80 110 150 150 Mbps ns ns ns ns ns ns ns ns ns ns ns ns
tPLH, tPHL RL = 27, CL = 15pF (Figure 2C) tSKEW tZH tZL tHZ RL = 27, CL = 15pF (Figure 2C) RL = 110, CL = 50pF, SW = GND (Figure 3), (Note 5) RL = 110, CL = 50pF, SW = VCC (Figure 3), (Note 5) RL = 110, CL = 50pF, SW = GND (Figure 3)
DRIVER SWITCHING CHARACTERISTICS (ISL83483, ISL83488) Maximum Data Rate Driver Differential Output Delay Driver Differential Rise or Fall Time Driver Input to Output Delay fMAX tDD tR, tF RDIFF = 60, CL = 15pF (Figure 2A) RDIFF = 60, CL = 15pF (Figure 2A) Full Full Full 25 Full Driver Output Skew Driver Enable to Output High (Except ISL83488) Driver Enable to Output Low (Except ISL83488) Driver Disable from Output High (Except ISL83488) tSKEW tZH tZL tHZ RL = 27, CL = 15pF (Figure 2C) RL = 110, CL = 50pF, SW = GND (Figure 3), (Note 5) RL = 110, CL = 50pF, SW = VCC (Figure 3), (Note 5) RL = 110, CL = 50pF, SW = GND (Figure 3) Full Full Full 25 Full 250 600 400 600 400 930 900 930 140 385 55 63 1400 1200 1500 1500 800 800 80 110 kbps ns ns ns ns ns ns ns ns ns
tPLH, tPHL RL = 27, CL = 15pF (Figure 2C)
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
Electrical Specifications
Test Conditions: VCC = 3V to 3.6V; Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = 25oC, Note 2 (Continued) SYMBOL tLZ TEST CONDITIONS RL = 110, CL = 50pF, SW = VCC (Figure 3) TEMP (oC) 25 Full tZH(SHDN) RL = 110, CL = 50pF, SW = GND (Notes 7, 8) tZL(SHDN) RL = 110, CL = 50pF, SW = VCC (Figure 3), (Notes 7, 8) Full Full MIN TYP 70 450 126 MAX 80 110 2000 2000 UNITS ns ns ns ns
PARAMETER Driver Disable from Output Low (Except ISL83488) Driver Enable from Shutdown to Output High (Except ISL83488) Driver Enable from Shutdown to Output Low (Except ISL83488)
RECEIVER SWITCHING CHARACTERISTICS (All Versions) Receiver Input to Output Delay Receiver Skew | tPLH - tPHL | tPLH, tPHL (Figure 4) tSKD (Figure 4) Full 25 Full Receiver Enable to Output High (Except ISL83488 and ISL83490) Receiver Enable to Output Low (Except ISL83488 and ISL83490) Receiver Disable from Output High (Except ISL83488 and ISL83490) Receiver Disable from Output Low (Except ISL83488 and ISL83490) Time to Shutdown (Except ISL83488 and ISL83490) Receiver Enable from Shutdown to Output High (Except ISL83488 and ISL83490) Receiver Enable from Shutdown to Output Low (Except ISL83488 and ISL83490) NOTES: 2. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. 3. Supply current specification is valid for loaded drivers when DE = 0V. 4. Applies to peak current. See "Typical Performance Curves" for more information. 5. When testing the ISL83483, ISL83485, ISL83491, keep RE = 0 to prevent the device from entering SHDN. 6. When testing the ISL83483, ISL83485, ISL83491, the RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN. 7. The ISL83483, ISL83485, ISL83491 are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See "Low-Power Shutdown Mode" section. 8. Keep RE = VCC, and set the DE signal low time >300ns to ensure that the device enters SHDN. 9. Set the RE signal high time >300ns to ensure that the device enters SHDN. tZH tZL tHZ tLZ tSHDN RL = 1k, CL = 15pF, SW = GND (Figure 5), (Note 6) RL = 1k, CL = 15pF, SW = VCC (Figure 5), (Note 6) RL = 1k, CL = 15pF, SW = GND (Figure 5) RL = 1k, CL = 15pF, SW = VCC (Figure 5) (Note 7) Full Full Full Full Full Full 25 80 45 2 2 11 11 7 7 190 240 90 10 12 50 50 45 45 300 600 ns ns ns ns ns ns ns ns ns
tZH(SHDN) RL = 1k, CL = 15pF, SW = GND (Figure 5), (Notes 7, 9) tZL(SHDN) RL = 1k, CL = 15pF, SW = VCC (Figure 5), (Notes 7, 9)
Full
-
240
600
ns
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Test Circuits and Waveforms
VCC
DE DI D Y Z VOD
RL/2 VCC
375 DE DI D Y Z VOD RL = 60 VCM -7V to +12V 375
RL/2
VOC
FIGURE 1A. VOD AND VOC
FIGURE 1B. VOD WITH COMMON MODE LOAD FIGURE 1. DC DRIVER TEST CIRCUITS
3V CL = 15pF 3V DE DI D Y SIGNAL GENERATOR tPHL tPLH VOH OUT (Z) 50% 50% VOL OUT 3V DE DI D Y CL = 15pF SIGNAL GENERATOR VOM = VOH + VOL 2 1.5V Z RL = 27 VOM DIFF OUT (Y - Z) 90% 50% 10% tR SKEW = |tPLH (Y or Z) - tPHL (Z or Y)| 90% 50% 10% tF tDD tDD +VOD -VOD Z RDIFF = 60 CL = 15pF OUT (Y) tPLH 50% tPHL VOH 50% VOL DI 1.5V 1.5V 0V
FIGURE 2A. DIFFERENTIAL TEST CIRCUIT
FIGURE 2C. SINGLE ENDED TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Test Circuits and Waveforms (Continued)
DE DI D SIGNAL GENERATOR Y SW CL = 50pF tZH, tZH(SHDN) NOTE 7 OUTPUT HIGH VOH - 0.25V OUT (Y, Z) 50% 0V tZL, tZL(SHDN) NOTE 7 OUT (Y, Z) 50% VOL + 0.25V V OUTPUT LOW
OL
Z
110
VCC GND DE NOTE 7 1.5V 1.5V
3V 0V tHZ VOH
PARAMETER tHZ tLZ tZH tZL tZH(SHDN) tZL(SHDN)
OUTPUT Y/Z Y/Z Y/Z Y/Z Y/Z Y/Z
RE X X 0 (Note 5) 0 (Note 5) 1 (Note 8) 1 (Note 8)
DI 1/0 0/1 1/0 0/1 1/0 0/1
SW GND VCC GND VCC GND VCC
tLZ VCC
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES (EXCLUDING ISL83488, ISL83490)
GND +1.5V
RE B A R 15pF RO A 1.5V 1.5V
3V 0V tPLH tPHL VCC RO 50% 50% 0V
SIGNAL GENERATOR
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS FIGURE 4. RECEIVER PROPAGATION DELAY
RE GND SIGNAL GENERATOR B A R RO 1k SW 15pF tZH, tZH(SHDN) NOTE 7 OUTPUT HIGH VOH - 0.25V RO 1.5V 0V tZL, tZL(SHDN) NOTE 7 RO 1.5V VOL + 0.25V V OUTPUT LOW
OL
VCC GND RE
NOTE 7 3V 1.5V 1.5V 0V tHZ VOH
PARAMETER tHZ tLZ tZH (Note 6) tZL (Note 6) tZH(SHDN) (Note 9) tZL(SHDN) (Note 9)
DE 0 0 0 0 0 0
A +1.5V -1.5V +1.5V -1.5V +1.5V -1.5V
SW GND VCC GND VCC GND VCC
tLZ VCC
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES (EXCLUDING ISL83488, ISL83490)
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ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Application Information
RS-485 and RS-422 are differential (balanced) data transmission standards for use in long haul or noisy environments. RS-422 is a subset of RS-485, so RS-485 transceivers are also RS-422 compliant. RS-422 is a pointto-multipoint (multidrop) standard, which allows only one driver and up to 10 (assuming one unit load devices) receivers on each bus. RS-485 is a true multipoint standard, which allows up to 32 one unit load devices (any combination of drivers and receivers) on each bus. To allow for multipoint operation, the RS-485 spec requires that drivers must handle bus contention without sustaining any damage. Another important advantage of RS-485 is the extended common mode range (CMR), which specifies that the driver outputs and receiver inputs withstand signals that range from +12V to -7V. RS-422 and RS-485 are intended for runs as long as 4000', so the wide CMR is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. rate limited versions is a maximum of 250kbps. Outputs of ISL83485, ISL83490, ISL83491 drivers are not limited, so faster output transition times allow data rates of at least 10Mbps.
Data Rate, Cables, and Terminations
RS-485, RS-422 are intended for network lengths up to 4000', but the maximum system data rate decreases as the transmission length increases. Devices operating at 10Mbps are limited to lengths of a few hundred feet, while the 250kbps versions can operate at full data rates with lengths in excess of 1000'. Twisted pair is the cable of choice for RS-485, RS-422 networks. Twisted pair cables tend to pick up noise and other electromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receivers in these ICs. Proper termination is imperative, when using the 10Mbps devices, to minimize reflections. Short networks using the 250kbps versions need not be terminated, but, terminations are recommended unless power dissipation is an overriding concern. In point-to-point, or point-to-multipoint (single driver on bus) networks, the main cable should be terminated in its characteristic impedance (typically 120) at the end farthest from the driver. In multi-receiver applications, stubs connecting receivers to the main cable should be kept as short as possible. Multipoint (multi-driver) systems require that the main cable be terminated in its characteristic impedance at both ends. Stubs connecting a transceiver to the main cable should be kept as short as possible.
Receiver Features
These devices utilize a differential input receiver for maximum noise immunity and common mode rejection. Input sensitivity is 200mV, as required by the RS422 and RS-485 specifications. Receiver input impedance surpasses the RS-422 spec of 4k, and meets the RS-485 "Unit Load" requirement of 12k minimum. Receiver inputs function with common mode voltages as great as +9V/-7V outside the power supplies (i.e., +12V and -7V), making them ideal for long networks where induced voltages are a realistic concern. All the receivers include a "fail-safe if open" function that guarantees a high level receiver output if the receiver inputs are unconnected (floating). Receivers easily meet the data rates supported by the corresponding driver. ISL83483, ISL83485, ISL83491 receiver outputs are tristatable via the active low RE input.
Built-In Driver Overload Protection
As stated previously, the RS-485 spec requires that drivers survive worst case bus contentions undamaged. The ISL834XX devices meet this requirement via driver output short circuit current limits, and on-chip thermal shutdown circuitry. The driver output stages incorporate short circuit current limiting circuitry which ensures that the output current never exceeds the RS-485 spec, even at the common mode voltage range extremes. Additionally, these devices utilize a foldback circuit which reduces the short circuit current, and thus the power dissipation, whenever the contending voltage exceeds either supply. In the event of a major short circuit condition, ISL834XX devices also include a thermal shutdown feature that disables the drivers whenever the die temperature becomes excessive. This eliminates the power dissipation, allowing the die to cool. The drivers automatically reenable after the die temperature drops about 15 degrees. If the contention persists, the thermal shutdown/reenable cycle repeats until the fault is cleared. Receivers stay operational during thermal shutdown.
Driver Features
The RS-485, RS-422 driver is a differential output device that delivers at least 1.5V across a 54 load (RS-485), and at least 2V across a 100 load (RS-422) even with VCC = 3V. The drivers feature low propagation delay skew to maximize bit width, and to minimize EMI. Drivers of the ISL83483, ISL83485, ISL83491 are tri-statable via the active high DE input. ISL83483/88 driver outputs are slew rate limited to minimize EMI, and to minimize reflections in unterminated or improperly terminated networks. Data rate on these slew 10
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
Low Power Shutdown Mode (ISL83483, ISL83485, ISL83491 Only)
These CMOS transceivers all use a fraction of the power required by their bipolar counterparts, but the ISL83483, ISL83485, ISL83491 include a shutdown feature that reduces the already low quiescent ICC to a 15nA trickle. They enter shutdown whenever the receiver and driver are simultaneously disabled (RE = VCC and DE = GND) for a period of at least 300ns. Disabling both the driver and the receiver for less than 80ns guarantees that shutdown is not entered. Note that receiver and driver enable times increase when these devices enable from shutdown. Refer to Notes 5-9, at the end of the Electrical Specification table, for more information.
Typical Performance Curves
110 DRIVER OUTPUT CURRENT (mA) 100 90 80 70 60 50 40 30 20 10 0 0
VCC = 3.3V, TA = 25oC, ISL83483 thru ISL83491; Unless Otherwise Specified
2.9 DIFFERENTIAL OUTPUT VOLTAGE (V) 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 -40 -25 0 25 50 75 85 RDIFF = 54 RDIFF = 100
0.5 1 1.5 2 2.5 DIFFERENTIAL OUTPUT VOLTAGE (V)
3
3.5
TEMPERATURE (oC)
FIGURE 6. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT VOLTAGE
FIGURE 7. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs TEMPERATURE
160 140 120 100 OUTPUT CURRENT (mA) 80 60 ICC (A) 40 20 0 -20 -40 -60 Y OR Z = HIGH Y OR Z = LOW
800 ISL83483/85, DE = VCC, RE = X 750
700 ISL83483/85, DE = RE = GND; ISL83491, DE = X, RE = GND; ISL83488/90 650
-80 -100 -120 -7 -6 -4 -2 0 2 4 6 OUTPUT VOLTAGE (V) 8 10 12 600 -40 -25 0 25 50 75 85
TEMPERATURE (oC)
FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE
FIGURE 9. SUPPLY CURRENT vs TEMPERATURE
11
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Typical Performance Curves
1200 RDIFF = 54
VCC = 3.3V, TA = 25oC, ISL83483 thru ISL83491; Unless Otherwise Specified (Continued)
300 |tPHLY - tPLHZ| |tPLHY - tPHLZ| 200 SKEW (ns) RDIFF = 54 FIGURE 2A
1100 PROPAGATION DELAY (ns) tPLHZ 1000 tPLHY
250
150
900
tPHLY tPHLZ
100
800
50 |CROSS PT. OF Y & Z - CROSS PT. OF Y & Z|
700 -40
-25
0 25 TEMPERATURE (oC)
50
75
85
0 -40
-25
0 50 25 TEMPERATURE (oC)
75
85
FIGURE 10. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL83483, ISL83488)
FIGURE 11. DRIVER SKEW vs TEMPERATURE (ISL83483, ISL83488)
16 RDIFF = 54 15 PROPAGATION DELAY (ns) 14 13 tPLHZ
4 3.5 3 2.5 RDIFF = 54 FIGURE 2A |tPHLY - tPLHZ|
12 11 10 9 tPHLZ 8 -40 -25 0 25
SKEW (ns)
tPLHY
2 1.5 |CROSSING PT. OF Y & Z CROSSING PT. OF Y & Z| 1 |tPLHY - tPHLZ| 0.5 -40
tPHLY tPHLY
50
75
85
-25
TEMPERATURE (oC)
0 25 TEMPERATURE (oC)
50
75
85
FIGURE 12. DRIVER PROPAGATION DELAY vs TEMPERATURE (ISL83485, ISL83490, ISL83491)
FIGURE 13. DRIVER SKEW vs TEMPERATURE (ISL83485, ISL84390, ISL83491)
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
RECEIVER OUTPUT (V)
RDIFF = 54, CL = 15pF DI 5 0 5 RO 0
RDIFF = 54, CL = 15pF DI 5 0 5 0 RO
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
3 2.5 2 1.5 1 0.5 0 TIME (400ns/DIV) A/Y B/Z
3 2.5 2 1.5 1 0.5 0 TIME (400ns/DIV) B/Z A/Y
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL83483, ISL83488)
FIGURE 15. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL83483, ISL83488)
12
DRIVER INPUT (V)
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Typical Performance Curves
RECEIVER OUTPUT (V)
VCC = 3.3V, TA = 25oC, ISL83483 thru ISL83491; Unless Otherwise Specified (Continued)
DRIVER INPUT (V) RECEIVER OUTPUT (V) DRIVER INPUT (V)
RDIFF = 54, CL = 15pF DI 5 0 5 RO 0
RDIFF = 54, CL = 15pF DI 5 0 5 RO 0
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
3 2.5 2 1.5 1 0.5 0 TIME (10ns/DIV) A/Y B/Z
3 2.5 2 1.5 1 0.5 0 TIME (10ns/DIV) B/Z A/Y
FIGURE 16. DRIVER AND RECEIVER WAVEFORMS, LOW TO HIGH (ISL83485, ISL83490, ISL83491)
FIGURE 17. DRIVER AND RECEIVER WAVEFORMS, HIGH TO LOW (ISL83485, ISL83490, ISL83491)
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 528 PROCESS: Si Gate CMOS
13
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Dual-In-Line Plastic Packages (PDIP)
N E1 INDEX AREA 12 3 N/2
E8.3 (JEDEC MS-001-BA ISSUE D)
8 LEAD DUAL-IN-LINE PLASTIC PACKAGE INCHES SYMBOL
-B-
MILLIMETERS MIN 0.39 2.93 0.356 1.15 0.204 9.01 0.13 7.62 6.10 MAX 5.33 4.95 0.558 1.77 0.355 10.16 8.25 7.11 NOTES 4 4 8, 10 5 5 6 5 6 7 4 9 Rev. 0 12/93
MIN 0.015 0.115 0.014 0.045 0.008 0.355 0.005 0.300 0.240
MAX 0.210 0.195 0.022 0.070 0.014 0.400 0.325 0.280
-AD BASE PLANE SEATING PLANE D1 B1 B 0.010 (0.25) M D1 A1 A2 L A C L E
A A1 A2 B B1 C D D1 E
-C-
eA eC
C
e
C A BS
eB
NOTES: 1. Controlling Dimensions: INCH. In case of conflict between English and Metric dimensions, the inch dimensions control. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication No. 95. 4. Dimensions A, A1 and L are measured with the package seated in JEDEC seating plane gauge GS-3. 5. D, D1, and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch (0.25mm). 6. E and eA are measured with the leads constrained to be perpendicular to datum -C- . 7. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater. 8. B1 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm). 9. N is the maximum number of terminal positions. 10. Corner leads (1, N, N/2 and N/2 + 1) 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).
E1 e eA eB L N
0.100 BSC 0.300 BSC 0.115 8 0.430 0.150 -
2.54 BSC 7.62 BSC 10.92 3.81 8
2.93
14
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Dual-In-Line Plastic Packages (PDIP)
N E1 INDEX AREA 12 3 N/2
E14.3 (JEDEC MS-001-AA ISSUE D)
14 LEAD DUAL-IN-LINE PLASTIC PACKAGE INCHES SYMBOL
-B-
MILLIMETERS MIN 0.39 2.93 0.356 1.15 0.204 18.66 0.13 7.62 6.10 MAX 5.33 4.95 0.558 1.77 0.355 19.68 8.25 7.11 NOTES 4 4 8 5 5 6 5 6 7 4 9 Rev. 0 12/93
MIN 0.015 0.115 0.014 0.045 0.008 0.735 0.005 0.300 0.240
MAX 0.210 0.195 0.022 0.070 0.014 0.775 0.325 0.280
A
E A2 L A C L
-AD BASE PLANE SEATING PLANE D1 B1 B 0.010 (0.25) M D1 A1
A1 A2
-C-
B B1 C D D1 E E1 e eA eB L N
eA eC
C
e
C A BS
eB
NOTES: 1. Controlling Dimensions: INCH. In case of conflict between English and Metric dimensions, the inch dimensions control. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication No. 95. 4. Dimensions A, A1 and L are measured with the package seated in JEDEC seating plane gauge GS-3. 5. D, D1, and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch (0.25mm). 6. E and eA are measured with the leads constrained to be perpendicular to datum -C- . 7. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater. 8. B1 maximum dimensions do not include dambar protrusions. Dambar protrusions shall not exceed 0.010 inch (0.25mm). 9. N is the maximum number of terminal positions. 10. Corner leads (1, N, N/2 and N/2 + 1) 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).
0.100 BSC 0.300 BSC 0.115 14 0.430 0.150 -
2.54 BSC 7.62 BSC 10.92 3.81 14
2.93
15
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Small Outline Plastic Packages (SOIC)
N INDEX AREA E -B1 2 3 SEATING PLANE -AD -CA h x 45o H 0.25(0.010) M BM
M8.15 (JEDEC MS-012-AA ISSUE C)
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A
L
MILLIMETERS MIN 1.35 0.10 0.33 0.19 4.80 3.80 MAX 1.75 0.25 0.51 0.25 5.00 4.00 NOTES 9 3 4 5 6 7 8o Rev. 0 12/93
MIN 0.0532 0.0040 0.013 0.0075 0.1890 0.1497
MAX 0.0688 0.0098 0.020 0.0098 0.1968 0.1574
A1 B C D E

A1 0.10(0.004) C
e H h L N
0.050 BSC 0.2284 0.0099 0.016 8 0o 8o 0.2440 0.0196 0.050
1.27 BSC 5.80 0.25 0.40 8 0o 6.20 0.50 1.27
e
B 0.25(0.010) M C AM BS
NOTES: 1. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension "E" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. "L" is the length of terminal for soldering to a substrate. 7. "N" is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. The lead width "B", as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact.
16
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Small Outline Plastic Packages (SOIC)
N INDEX AREA E -B1 2 3 SEATING PLANE -AD -CA h x 45o H 0.25(0.010) M BM
M14.15 (JEDEC MS-012-AB ISSUE C)
14 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE INCHES SYMBOL A
L
MILLIMETERS MIN 1.35 0.10 0.33 0.19 8.55 3.80 MAX 1.75 0.25 0.51 0.25 8.75 4.00 NOTES 9 3 4 5 6 7 8o Rev. 0 12/93
MIN 0.0532 0.0040 0.013 0.0075 0.3367 0.1497
MAX 0.0688 0.0098 0.020 0.0098 0.3444 0.1574
A1 B C D E

A1 0.10(0.004) C
e
B 0.25(0.010) M C AM BS
e H h L N
0.050 BSC 0.2284 0.0099 0.016 14 0o 8o 0.2440 0.0196 0.050
1.27 BSC 5.80 0.25 0.40 14 0o 6.20 0.50 1.27
NOTES: 1. Symbols are defined in the "MO Series Symbol List" in Section 2.2 of Publication Number 95. 2. Dimensioning and tolerancing per ANSI Y14.5M-1982. 3. Dimension "D" does not include mold flash, protrusions or gate burrs. Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 4. Dimension "E" does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 5. The chamfer on the body is optional. If it is not present, a visual index feature must be located within the crosshatched area. 6. "L" is the length of terminal for soldering to a substrate. 7. "N" is the number of terminal positions. 8. Terminal numbers are shown for reference only. 9. The lead width "B", as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact.
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