ISL41334

® ISL81334, ISL41334 Data Sheet December 20, 2005 FN6202.1 ±15kV ESD Protected, Two Port, Dual Protocol Transceivers The ISLX1334 are two port interface ICs where each port can be independently configured as a single RS-485/422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. With both ports set to the same mode, two RS-485/422 transceivers, or four RS-232 transceivers are available. If either port is in RS-232 mode, the onboard charge pump generates RS-232 compliant ±5V Tx output levels from a single VCC 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 receivers feature "full failsafe" operation, so the Rx outputs remain in a high state if the inputs are open or shorted together. The transmitters support up to three data rates, two of which are slew rate limited for problem free communications. The charge pump disables when both ports are in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors. Both RS-232 and RS-485 modes feature loopback and shutdown functions. Loopback internally connects the Tx outputs to the corresponding Rx input, to facilitate board level self test implementation. The outputs remain connected to the loads during loopback, so connection problems (e.g., shorted connectors or cables) can be detected. Shutdown mode disables the Tx and Rx outputs, disables the charge pumps, and places the IC in a low current (µA) mode. The ISL41334 is a QFN packaged device that includes two additional user selectable, lower speed and edge rate options for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply pin (VL) 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 also adds active low Rx enable pins to increase design flexibility, allowing Tx/Rx direction control, via a single signal per port, by connecting the corresponding DE and RE pins together. For a single port version of these devices, please see the ISL81387/ ISL41387 data sheet. NO. OF PORTS 2 2 Features • ±15kV (HBM) ESD Protected Bus Pins (RS-232 or RS-485) • Two Independent Ports, Each User Selectable for RS-232 (2 Transceivers) or RS-485/422 (1 Transceiver) • Flow-Through Pinouts Simplify Board Layouts • Pb-Free Plus Anneal Available (RoHS Compliant) • Large (2.7V) Differential VOUT for Improved Noise 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 (ISL41334 Only) - Fast Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps - Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps - Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 115kbps • Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 650kbps • Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .42µA • QFN Package Saves Board Space (ISL41334 Only) • Logic Supply Pin (VL) Eases Operation in Mixed Supply Systems (ISL41334 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 • Dual Channel RS-485 Interfaces TABLE 1. SUMMARY OF FEATURES RS-485 DATA RATE (bps) 20M 20M, 460k, 115k RS-232 DATA RATE (kbps) 650 650 VL PIN? NO YES ACTIVE H or L Rx ENABLE? NONE L LOW POWER SHUTDOWN? YES YES PART NUMBER ISL81334 ISL41334 PACKAGE OPTIONS 28 Ld SOIC, 28 Ld SSOP 40 Ld QFN (6 x 6mm) 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL81334, ISL41334 Ordering Information PART NUMBER (NOTE) ISL81334IAZ ISL81334IAZ-T ISL81334IBZ ISL81334IBZ-T ISL41334IRZ ISL41334IRZ-T PART MARKING 81334IAZ 81334IAZ ISL81334IBZ ISL81334IBZ 41334IRZ 41334IRZ TEMP. RANGE (°C) -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE (Pb-Free) 28 Ld SSOP 28 Ld SSOP Tape and Reel 28 Ld SOIC 28 Ld SOIC Tape and Reel 40 Ld QFN 40 Ld QFN Tape and Reel PKG. DWG. # M28.209 M28.209 M28.3 M28.3 L40.6x6 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 ISL81334 (SOIC, SSOP) TOP VIEW C1NC NC C1+ 1 C1- 2 V+ 3 A1 4 B1 5 Y1 6 Z1 7 SEL1 8 SEL2 9 Z2 10 Y2 11 B2 12 A2 13 GND 14 28 C2+ 27 C226 VCC 25 RB1 24 RA1 23 DZ1/DE1 22 DY1 21 LB 20 ON/OFF 19 DY2 18 DZ2/DE2 17 RA2 16 RB2 15 VV+ A1 B1 Y1 Z1 SEL1 SEL2 Z2 Y2 B2 1 2 3 4 5 6 7 8 9 10 11 A2 12 NC 13 SPA 14 SPB 15 GND 16 GND 17 RXEN1 18 RXEN2 19 V20 NC FN6202.1 December 20, 2005 ISL41334 (QFN) TOP VIEW VCC C1+ C2+ C2NC NC 32 VL 31 30 RB1 29 RA1 28 DZ1/DE1 27 DY1 26 LB 25 ON/OFF 24 DY2 23 DZ2/DE2 22 RA2 21 RB2 40 39 38 37 36 35 34 33 2 ISL81334, ISL41334 TABLE 2. ISL81334 FUNCTION TABLE INPUTS SEL1 or 2 0 X 1 1 NOTE: 1. Charge pumps are off iff SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps are on. ON/OFF 1 0 1 1 DE 1 or 2 N.A. X 0 1 RECEIVER OUTPUTS RA ON High-Z ON ON RB ON High-Z High-Z * High-Z * DRIVER OUTPUTS Y ON High-Z High-Z ON Z ON High-Z High-Z ON CHARGE PUMPS (NOTE 1) ON OFF OFF OFF MODE RS-232 Shutdown RS-485 RS-485 ISL81334 Truth Tables (FOR EACH PORT) RS-232 TRANSMITTING MODE INPUTS SEL1 or 2 ON/OFF 0 0 0 0 0 1 1 1 1 0 DY 0 0 1 1 X DZ 0 1 0 1 X OUTPUTS Y 1 1 0 0 High-Z Z 1 0 1 0 High-Z RS-485 RECEIVING MODE OUTPUT A 0 0 1 1 Open X B 0 1 0 1 Open X RA 1 1 0 0 1 High-Z RB 1 0 1 0 1 High-Z INPUTS SEL1 or 2 ON/OFF 1 1 1 1 1 1 1 0 B-A ≥ -40mV ≤ -200mV Open or Shorted together X OUTPUT RA 1 0 1 High-Z RB * High-Z High-Z High-Z High-Z RS-485 TRANSMITTING MODE INPUTS SEL1 or 2 ON/OFF 1 1 1 1 1 1 1 0 DE1 or 2 1 1 0 X DY 0 1 X X OUTPUTS Y 1 0 High-Z High-Z Z 0 1 High-Z High-Z RS-232 RECEIVING MODE INPUTS SEL1 or 2 ON/OFF 0 0 0 0 0 0 1 1 1 1 1 0 * Internally pulled high through a 40kΩ resistor. 3 FN6202.1 December 20, 2005 ISL81334, ISL41334 TABLE 3. ISL41334 FUNCTION TABLE INPUTS SEL1 or 2 ON/OFF 0 0 X 1 1 1 1 1 1 1 1 1 1 NOTE: 2. Charge pumps are off iff SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps are on. 1 1 0 1 1 1 1 1 1 1 1 1 1 SPA X X X X 0 0 1 1 X 0 0 1 1 SPB X X X X 0 1 0 1 X 0 1 0 1 RXEN 1 or 2 DE 1 or 2 0 1 X 0 0 0 0 0 1 1 1 1 1 N.A. N.A. X 0 1 1 1 1 0 1 1 1 1 RECEIVER OUTPUTS RA ON High-Z High-Z ON ON ON ON ON RB ON High-Z High-Z DRIVER OUTPUTS Y ON ON High-Z Z ON ON High-Z High-Z ON ON ON ON High-Z ON ON ON ON DRIVER DATA RATE (Mbps) 0.46 0.46 N.A. N.A. 0.46 0.115 20 20 N.A. 0.46 0.115 20 20 CHARGE PUMPS (NOTE 2) ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF MODE RS-232 RS-232 Shutdown RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 High-Z * High-Z High-Z * High-Z * High-Z * High-Z * ON ON ON ON High-Z High-Z * High-Z High-Z High-Z * High-Z High-Z * High-Z High-Z * High-Z High-Z * ON ON ON ON ISL41334 Truth Tables (FOR EACH PORT) RS-232 TRANSMITTING MODE INPUTS SEL1 or 2 ON/OFF 0 0 0 0 0 1 1 1 1 0 DY 0 0 1 1 X DZ 0 1 0 1 X OUTPUTS Y 1 1 0 0 High-Z Z 1 0 1 0 High-Z RS-485 TRANSMITTING MODE INPUTS SEL1 ON/ DEN or 2 OFF 1 or 2 SPA SPB 1 1 1 1 1 1 1 1 1 0 1 1 1 0 X 0 0 1 X X 0 1 X X X DY 0/1 0/1 0/1 X X OUTPUTS Y 1/0 1/0 1/0 Z 0/1 0/1 0/1 DATA RATE Mbps 0.46 0.115 20 N.A. N.A. High-Z High-Z High-Z High-Z RS-232 RECEIVING MODE INPUTS RXEN 1 or 2 SEL1 or 2 ON/OFF 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 1 X A 0 0 1 1 Open X X B 0 1 0 1 Open X X OUTPUT RA 1 1 0 0 1 RB 1 0 1 0 1 1 1 1 0 SEL1 or 2 1 1 1 RS-485 RECEIVING MODE INPUTS ON/OFF 1 1 1 RXEN 1 or 2 0 0 0 1 X B-A ≥ -40mV ≤ -200mV Open or Shorted together X X OUTPUT RA 1 0 1 RB * High-Z High-Z High-Z High-Z High-Z High-Z High-Z High-Z High-Z High-Z High-Z * Internally pulled high through a 40kΩ resistor. 4 FN6202.1 December 20, 2005 ISL81334, ISL41334 Pin Descriptions PIN GND LB NC ON/OFF RXEN SEL VCC VL A MODE BOTH BOTH BOTH BOTH BOTH BOTH BOTH BOTH Ground connection. Enables loopback mode when low. Internally pulled-high. No Connection. If either port is in RS-232 mode, a low on ON/OFF disables the charge pumps. In either mode, a low disables all the outputs, and places the device in low power shutdown. Internally pulled-high. ON = 1 for normal operation. Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high. Internally pulled low. (QFN only) Interface Mode Select input. High puts corresponding port in RS-485 Mode, while a low puts it in RS-232 Mode. System power supply input (5V). Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. (QFN only) FUNCTION RS-232 Receiver input with ±15kV ESD protection. A low on A forces RA 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 RB high; A high on B forces RB low. RS-485 Noninverting receiver input with ±15kV ESD protection. DY 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 DY forces output Y high and output Z low. Similarly, a high on DY forces output Y low and output Z high. DZ DE RA RS-232 Driver input. A low on DZ forces output Z high. Similarly, a high on DZ forces output Z low. RS-485 Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low. Internally pulled high when port selected for RS-485 mode. RS-232 Receiver output. RS-485 Receiver output: If B > A by at least -40mV, RA 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). RB RS-232 Receiver output. RS-485 Not used. Internally pulled-high, and unaffected by 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. SP C1+ C1C2+ C2V+ V- RS-485 Speed control. Internally pulled-high. (QFN only) RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode. RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode. RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode. RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode. RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed if both ports in RS-485 Mode. RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed if both ports in RS-485 Mode. 5 FN6202.1 December 20, 2005 ISL81334, ISL41334 Typical Operating Circuit RS-232 MODE WITHOUT LOOPBACK +5V + +5V 0.1µF 1 + + 2 28 27 4 5kΩ 5 5kΩ 6 7 C1+ C1C2+ C2R 26 VCC V+ 3 + C3 0.1µF C4 0.1µF + RA1 C1 0.1µF C2 0.1µF + + + RS-232 MODE WITH LOOPBACK 0.1µF 1 2 28 27 4 5kΩ B1 5 5kΩ R LB Rx 25 C1+ C1C2+ C2R 24 RA1 26 VCC V+ 3 + C3 0.1µF C4 0.1µF + C1 0.1µF C2 0.1µF V- 15 V- 15 A1 24 A1 B1 R 25 RB1 RB1 Y1 Z1 D D LB 22 23 21 20 DY1 DZ1 VCC VCC Y1 Z1 6 7 D D LB 22 23 21 20 DY1 DZ1 GND VCC 8 SEL1 GND 14 ON/OFF 8 SEL1 GND 14 ON/OFF NOTE: PINOUT FOR SOIC AND SSOP SAME FOR PORT 2. NOTE: PINOUT FOR SOIC AND SSOP SAME FOR PORT 2. RS-485 MODE WITHOUT LOOPBACK +5V + +5V 0.1µF 1 + + 2 28 27 4 5 R 24 C1+ C1C2+ C226 VCC V+ 3 + C3 0.1µF C4 0.1µF + RA1 C1 0.1µF C2 0.1µF RS-485 MODE WITH LOOPBACK + 0.1µF 1 C1+ C1C2+ C2- 26 VCC V+ 3 + C3 0.1µF C4 0.1µF + RA1 C1 0.1µF C2 0.1µF A1 B1 + + 2 28 27 4 5 V- 15 V- 15 A1 B1 R 24 25 Y1 Z1 6 7 D 22 RB1 DY1 Y1 Z1 6 7 LB Rx 25 D 22 RB1 DY1 VCC VCC 23 8 DE1 LB ON/OFF GND 14 21 20 VCC VCC VCC VCC 23 8 DE1 LB SEL1 GND 14 ON/OFF 21 20 GND VCC SEL1 NOTE: PINOUT FOR SOIC AND SSOP SAME FOR PORT 2. NOTE: PINOUT FOR SOIC AND SSOP SAME FOR PORT 2. 6 FN6202.1 December 20, 2005 ISL81334, ISL41334 Absolute Maximum Ratings (TA = 25°C) VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V VL (QFN Only) . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VCC + 0.5V Input Voltages All Except A, B (non-QFN Package) . . . . . -0.5V to (VCC + 0.5V) All Except A, B (QFN Package) . . . . . . . . . . -0.5V to (VL + 0.5V) Input/Output Voltages A, B (Any Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V Y, Z (Any Mode, Note 3) . . . . . . . . . . . . . . . . . . . -12.5V to +12.5V RA, RB (non-QFN Package). . . . . . . . . . . . -0.5V to (VCC + 0.5V) RA, RB (QFN Package) . . . . . . . . . . . . . . . . -0.5V to (VL + 0.5V) Output Short Circuit Duration Y, Z, RA, RB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table Thermal Information Thermal Resistance (Typical, Note 4) θJA (°C/W) 28 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 65 28 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 60 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 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: 3. One output at a time, IOUT ≤ 100mA for ≤ 10 mins. 4. QFN θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. θJA for other packages is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 and Tech Brief TB389 for details. Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25°C (Note 5) SYMBOL TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITS PARAMETER DC CHARACTERISTICS - RS-485 DRIVER (SEL = VCC) Driver Differential VOUT (no load) Driver Differential VOUT (with load) VOD1 VOD2 R = 50Ω (RS-422) (Figure 1) R = 27Ω (RS-485) (Figure 1) VOD3 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 Driver Short-Circuit Current, VOUT = High or Low Driver Three-State Output Leakage Current (Y, Z) ∆VOD RD = 60Ω, R = 375Ω, VCM = -7V to 12V (Figure 1) R = 27Ω or 50Ω (Figure 1) Full Full Full Full Full 2.5 2.2 2 3.1 2.7 2.7 0.01 VCC 5 5 0.2 V V V V V VOC ∆VOC R = 27Ω or 50Ω (Figure 1) (Note 9) R = 27Ω or 50Ω (Figure 1) (Note 9) Full Full - 0.01 3.1 0.2 V V IOS IOZ -7V ≤ (VY or VZ) ≤ 12V (Note 7) Outputs Disabled, VCC = 0V or 5.5V VOUT = 12V VOUT = -7V Full Full Full 35 -200 - 250 500 - mA µA µA DC CHARACTERISTICS - RS-232 DRIVER (SEL = GND) Driver Output Voltage Swing Driver Output Short-Circuit Current VO IOS All TOUTS Loaded with 3kΩ to Ground VOUT = 0V Full Full ±5.0 -60 +6/-7 25/-35 60 V mA DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS) Input High Voltage VIH1 VIH2 VIH3 VL = VCC if QFN VL = 3.3V (QFN Only) VL = 2.5V (QFN Only) Full Full Full 2 2 1.5 1.6 1.2 1 V V V 7 FN6202.1 December 20, 2005 ISL81334, ISL41334 Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25°C (Note 5) (Continued) SYMBOL VIL1 VIL2 VIL3 Input Current IIN1 IIN2 TEST CONDITIONS VL = VCC if QFN VL = 3.3V (QFN Only) VL = 2.5V (QFN Only) Pins Without Pull-ups or Pull-downs LB, ON/OFF, DE, SP (QFN), RXEN (QFN) TEMP (°C) Full Full Full Full Full MIN -2 -25 TYP 1.4 1 MAX 0.8 0.7 0.5 2 25 UNITS V V V µA µA PARAMETER Input Low Voltage DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (SEL = VCC) Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Input Current (A, B) VTH ∆VTH IIN -7V ≤ VCM ≤ 12V, Full Failsafe VCM = 0V VCC = 0V or 4.5 to 5.5V VIN = 12V VIN = -7V Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V, VCC = 0 (Note 8) or 4.5V ≤ VCC ≤ 5.5V Full 25 Full Full Full -0.2 -0.64 15 35 -0.04 0.8 V mV mA mA kΩ DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (SEL = GND) Receiver Input Voltage Range Receiver Input Threshold VIN VIL VIH Receiver Input Hysteresis Receiver Input Resistance ∆VTH RIN VIN = ±15V, VCC Powered Up (Note 8) Full Full Full 25 Full -25 2.4 3 1.4 1.9 0.5 5 25 0.8 7 V V V V kΩ DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE) Receiver Output High Voltage VOH1 VOH2 VOH3 Receiver Output Low Voltage Receiver Short-Circuit Current Receiver Three-State Output Current Unused Receiver (RB) Pull-Up Resistance VOL IOSR IOZR ROBZ IO = -2mA (VL = VCC if QFN) IO = -650µA, VL = 3V, QFN Only IO = -500µA, VL = 2.5V, QFN Only IO = 3mA 0V ≤ VO ≤ VCC Output Disabled, 0V ≤ VO ≤ VCC (or VL for QFN) ON/OFF = VCC, SELX = VCC (RS-485 Mode) Full Full Full Full Full Full 25 3.5 2.6 2 7 4.6 2.9 2.4 0.1 40 0.4 85 ±10 V V V V mA µA kΩ POWER SUPPLY CHARACTERISTICS No-Load Supply Current, Note 6 ICC232 ICC485 Shutdown Supply Current ISHDN232 ISHDN485 SEL1 or SEL2 = GND, LB = ON/OFF = VCC SEL 1 & 2 = LB = DE = ON/OFF = VCC ON/OFF = SELX = GND, LB = VCC, (SPX = VCC if QFN) ON/OFF = DEX = GND, SELX = LB = VCC, (SPX = GND if QFN) SOIC/SSOP QFN Full Full Full Full Full 3.7 1.6 25 42 80 7 5 50 80 160 mA mA µA µA µA ESD CHARACTERISTICS Bus Pins (A, B, Y, Z) Any Mode All Other Pins Human Body Model Human Body Model 25 25 15 4 kV kV 8 FN6202.1 December 20, 2005 ISL81334, ISL41334 Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25°C (Note 5) (Continued) SYMBOL TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITS PARAMETER RS-232 DRIVER AND RECEIVER SWITCHING CHARACTERISTICS (SEL = GND, ALL VERSIONS AND SPEEDS) Driver Output Transition Region Slew Rate Driver Output Transition Time Driver Propagation Delay SR RL = 3kΩ, Measured From 3V to -3V or -3V to 3V RL = 3kΩ, CL = 2500pF, 10% - 90% RL = 3kΩ, CL = 1000pF (Figure 6) CL ≥ 15pF CL ≤ 2500pF Full Full Full Full Full tDPHL - tDPLH (Figure 6) VOUT = ±3.0V RL = 3kΩ, CL = 1000pF, One Transmitter Switching per port CL = 15pF (Figure 7) Full 25 Full Full Full tRPHL - tRPLH (Figure 7) CL = 15pF Full Full 4 0.22 460 0.46 18 12 1.2 1 1.2 240 20 650 50 40 10 2 30 3.1 2 2 400 120 120 40 V/µs V/µs µs µs µs ns µs kbps ns ns ns Mbps tr, tf tDPHL tDPLH Driver Propagation Delay Skew Driver Enable Time from Shutdown Driver Maximum Data Rate Receiver Propagation Delay tDSKEW tDENSD DRD tRPHL tRPLH Receiver Propagation Delay Skew Receiver Maximum Data Rate tRSKEW DRR RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), SEL = VCC, ALL VERSIONS (SPA = VCC if QFN)) Driver Differential Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output Low Driver Enable to Output High Driver Disable from Output Low Driver Disable from Output High Driver Enable from Shutdown to Output Low Driver Enable from Shutdown to Output High Driver Maximum Data Rate tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 2) tSKEW tR, tF tZL tZH tLZ tHZ tZL(SHDN) RDIFF = 54Ω, CL = 100pF (Figure 2) RDIFF = 54Ω, CL = 100pF, Figure 2 CL = 100pF, SW = VCC (Figure 3) CL = 100pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) RL = 500Ω, CL = 100pF, SW = VCC (Figure 3) Full Full Full Full Full Full Full Full Full Full 15 3 30 0.5 11 27 24 31 24 65 152 30 50 10 20 60 60 60 60 250 250 ns ns ns ns ns ns ns ns ns Mbps tZH(SHDN) RL = 500Ω, CL = 100pF, SW = GND (Figure 3) fMAX RDIFF = 54Ω, CL = 100pF (Figure 2) RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps, QFN ONLY), SEL = VCC, SPA = SPB= GND) Driver Differential Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output Low Driver Enable to Output High Driver Disable from Output Low Driver Disable from Output High Driver Enable from Shutdown to Output Low Driver Enable from Shutdown to Output High tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 2) tSKEW tR, tF tZL tZH tLZ tHZ tZL(SHDN) RDIFF = 54Ω, CL = 100pF (Figure 2) RDIFF = 54Ω, CL = 100pF (Figure 2) CL = 100pF, SW = VCC (Figure 3) CL = 100pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) RL = 500Ω, CL = 100pF, SW = VCC (Figure 3) Full Full Full Full Full Full Full Full Full 200 300 490 110 600 30 128 31 24 65 255 1000 400 1100 300 300 60 60 500 500 ns ns ns ns ns ns ns ns ns tZH(SHDN) RL = 500Ω, CL = 100pF, SW = GND (Figure 3) 9 FN6202.1 December 20, 2005 ISL81334, ISL41334 Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, VL = VCC (for QFN only); Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25°C (Note 5) (Continued) SYMBOL fMAX TEST CONDITIONS RDIFF = 54Ω, CL = 100pF (Figure 2) TEMP (°C) Full MIN TYP 2000 MAX UNITS kbps PARAMETER Driver Maximum Data Rate RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps, QFN ONLY), SEL = VCC, SPA = GND, SPB= VCC) Driver Differential Input to Output Delay Driver Output Skew Driver Differential Rise or Fall Time Driver Enable to Output Low Driver Enable to Output High Driver Disable from Output Low Driver Disable from Output High Driver Enable from Shutdown to Output Low Driver Enable from Shutdown to Output High Driver Maximum Data Rate tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 2) tSKEW tR, tF tZL tZH tLZ tHZ tZL(SHDN) RDIFF = 54Ω, CL = 100pF (Figure 2) RDIFF = 54Ω, CL = 100pF (Figure 2) CL = 100pF, SW = VCC (Figure 3) CL = 100pF, SW = GND (Figure 3) CL = 15pF, SW = VCC (Figure 3) CL = 15pF, SW = GND (Figure 3) RL = 500Ω, CL = 100pF, SW = VCC (Figure 3) Full Full Full Full Full Full Full Full Full Full 800 1000 1500 350 2000 32 300 31 24 65 420 800 2500 1250 3100 600 600 60 60 800 800 ns ns ns ns ns ns ns ns ns kbps tZH(SHDN) RL = 500Ω, CL = 100pF, SW = GND (Figure 3) fMAX RDIFF = 54Ω, CL = 100pF (Figure 2) RS-485 RECEIVER SWITCHING CHARACTERISTICS (SEL = VCC, ALL VERSIONS AND SPEEDS) Receiver Input to Output Delay Receiver Skew | tPLH - tPHL | Receiver Maximum Data Rate tPLH, tPHL tSKEW fMAX (Figure 4) (Figure 4) Full Full Full 20 50 0.1 40 90 10 ns ns Mbps RECEIVER ENABLE/DISABLE CHARACTERISTICS (ALL MODES AND SPEEDS) Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Output Low Receiver Disable from Output High Receiver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High NOTES: 5. 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. 6. Supply current specification is valid for loaded drivers when DE = 0V (RS-485 mode only). 7. Applies to peak current. See “Typical Performance Curves” for more information. 8. RIN defaults to RS-485 mode (>15kΩ) when the device is unpowered (VCC = 0V), regardless of the state of the SEL inputs. 9. VCC ≤ 5.25V. tZL tZH tLZ tHZ tZLSHDN QFN Only, CL = 15pF, SW = VCC (Figure 5) QFN Only, CL = 15pF, SW = GND (Figure 5) QFN Only, CL = 15pF, SW = VCC (Figure 5) QFN Only, CL = 15pF, SW = GND (Figure 5) CL = 15pF, SW = VCC (Figure 5) RS-485 Mode RS-232 Mode tZHSHDN CL = 15pF, SW = GND (Figure 5) RS-485 Mode RS-232 Mode Full Full Full Full Full 25 Full 25 22 23 24 25 260 35 260 25 60 60 60 60 700 700 ns ns ns ns ns ns ns ns 10 FN6202.1 December 20, 2005 ISL81334, ISL41334 Test Circuits and Waveforms R VCC DE Y DY D Z R VOC RD VOD FIGURE 1. RS-485 DRIVER VOD AND VOC TEST CIRCUIT 3V DY CL = 100pF Y D Z SIGNAL GENERATOR OUT (Y) tDLH DIFF OUT (Z - Y) tR SKEW = |tPLH (Y or Z) - tPHL (Z or Y)| 90% 10% 0V 0V RDIFF CL = 100pF tPHL 50% tDHL 90% 10% tF +VOD -VOD tPLH VOH 50% VOL 1.5V 1.5V 0V DE DY tPLH OUT (Z) 50% tPHL VOH 50% VOL VCC FIGURE 2A. TEST CIRCUIT FIGURE 2B. MEASUREMENT POINTS FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES 11 FN6202.1 December 20, 2005 ISL81334, ISL41334 Test Circuits and Waveforms (Continued) DE DY D SIGNAL GENERATOR Z CL tZH(SHDN) FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN DE OUT (Y, Z) tZH OUTPUT HIGH 2.3V 0V tZL tZL(SHDN) OUT (Y, Z) 2.3V OUTPUT LOW tLZ VCC VOL + 0.5V V OL tHZ VOH - 0.5V VOH SW Y 500Ω VCC GND ENABLED DE (ON/OFF FOR SHDN) 1.5V 1.5V 0V 3V PARAMETER tHZ tLZ tZH tZL tZH(SHDN) tZL(SHDN) ON/DE 1/1/1/1/-/1 -/1 OUTPUT Y/Z Y/Z Y/Z Y/Z Y/Z Y/Z DY 0/1 1/0 0/1 1/0 0/1 1/0 SW GND VCC GND VCC GND VCC CL (pF) 15 15 100 100 100 100 FIGURE 3B. MEASUREMENT POINTS FIGURE 3A. TEST CIRCUIT FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES RXEN (QFN ONLY) 0V A B R 15pF RA B 0V tPLH tPHL SIGNAL GENERATOR 0V +1.5V -1.5V VCC RA 1.5V 1.5V 0V FIGURE 4A. TEST CIRCUIT FIGURE 4B. MEASUREMENT POINTS FIGURE 4. RS-485 RECEIVER PROPAGATION DELAY RXEN (QFN ONLY) A R SIGNAL GENERATOR B 15pF RA 1kΩ SW VCC GND 3V ON/OFF (FOR SHDN TESTS) 1.5V 0V ENABLED 3V RXEN (QFN ONLY) 1.5V 1.5V 0V FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN RXEN PARAMETER tHZ (QFN Only) tLZ (QFN Only) tZH (QFN Only) tZL (QFN Only) tZH(SHDN) tZL(SHDN) ON/RXEN 1/1/1/1/-/0 -/0 B +1.5V -1.5V +1.5V -1.5V +1.5V -1.5V SW GND VCC GND VCC GND VCC tZH tZH(SHDN) RA OUTPUT HIGH 1.5V tHZ VOH - 0.5V VOH 0V tZL tZL(SHDN) RA 1.5V tLZ VCC VOL + 0.5V V OL OUTPUT LOW FIGURE 5A. TEST CIRCUIT FIGURE 5B. MEASUREMENT POINTS FIGURE 5. RS-485 RECEIVER ENABLE AND DISABLE TIMES 12 FN6202.1 December 20, 2005 ISL81334, ISL41334 Test Circuits and Waveforms (Continued) VCC DE DY,Z D RL Y, Z CL tDPHL OUT (Y,Z) 0V 0V VOSKEW = |tDPHL - tDPLH| 3V DY,Z 1.5V 1.5V 0V tDPLH VO+ SIGNAL GENERATOR FIGURE 6A. TEST CIRCUIT FIGURE 6B. MEASUREMENT POINTS FIGURE 6. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES RXEN A, B R RA, RB CL = 15pF tRPHL RA, RB 0.8V SKEW = |tRPHL - tRPLH| tRPLH 2.4V VOH VOL 3V A, B 1.3V 1.7V 0V SIGNAL GENERATOR FIGURE 7A. TEST CIRCUIT FIGURE 7B. MEASUREMENT POINTS FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES 13 FN6202.1 December 20, 2005 ISL81334, ISL41334 Typical Application RS-232 to RS-485 Converter The ISLX1334 are ideal for implementing a single IC 2-wire (Tx Data, Rx Data) protocol converter, because each port can be programmed for a different protocol. Figure 8 illustrates the simple connections to create a single transceiver RS-232 to RS-485 converter. Depending on the RS-232 data rate, using an RS-422 bus as an RS-232 “extension cord” can extend the transmission distance up to 4000’ (1220m). A similar circuit on the other end of the cable completes the conversion to/from RS-232. +5V C1 0.1µF C2 0.1µF NC TxD RS-232 IN + 0.1µF 2 C128 C2+ + 27 C24 A1 5kΩ 5 B1 5kΩ 6 Y1 7 Z1 8 VCC 9 SEL1 SEL2 ON/OFF 20 VCC + 1 C1+ 26 VCC V+ 3 +C3 0.1µF C4 0.1µF + Detailed Description Each of the two ISLX1334 ports supports dual protocols: RS-485/422, and RS-232. RS-485 and RS-422 are differential (balanced) data transmission standards for use in high speed (up to 20Mbps) networks, or long haul and noisy environments. The differential signaling, coupled with RS-485’s requirement for extended common mode range (CMR) of +12V to -7V make these transceivers extremely tolerant of ground potential differences, as well as voltages induced in the cable by external fields. Both of these effects are real concerns when communicating over the RS-485/422 maximum distance of 4000’ (1220m). It is important to note that the ISLX1334 don’t follow the RS-485 convention whereby the inverting I/O is labeled “B/Z”, and the noninverting I/O is “A/Y”. Thus, in the application diagrams below the 1334 A/Y (B/Z) pins connect to the B/Z (A/Y) pins of the generic RS-485/422 ICs. RS-422 is typically a point-to-point (one driver talking to one receiver on a bus), or a point-to-multipoint (multidrop) standard that allows only one driver and up to 10 receivers on each bus. Because of the one driver per bus limitation, RS-422 networks use a two bus, full duplex structure for bidirectional communication, and the Rx inputs and Tx outputs (no tri-state required) connect to different busses, as shown in Figure 10. Conversely, RS-485 is a true multipoint standard, which allows up to 32 devices (any combination of drivers- must be tri-statable - and receivers) on each bus. Now bidirectional communication takes place on a single bus, so the Rx inputs and Tx outputs of a port connect to the same bus lines, as shown in Figure 9. Each port set to RS-485 /422 mode includes one Rx and one Tx. V- 15 R RA1 24 NC RB1 25 R NC RxD RS-232 OUT D D DY1 22 DZ1 23 13 A2 RS-485 IN 12 B2 11 RS-485 OUT 10 Y2 Z2 D R RA2 17 DY2 19 DE2 18 VCC GND 14 NOTE: PINOUT FOR SOIC AND SSOP FIGURE 8. SINGLE IC RS-232 TO RS-485 CONVERTER GENERIC 1/2 DUPLEX 485 XCVR RO RE DE DI D 0.1µF GND B/Z A/Y Y D Z GND B/Z A/Y RT RT GND D + GENERIC 1/2 DUPLEX 485 XCVR +5V + VCC R RO RE DE DI +5V ISLX1334 VCC RA RXEN * Tx/Rx DE DY R B A + 0.1µF 0.1µF R +5V VCC * QFN ONLY FIGURE 9. TYPICAL HALF DUPLEX RS-485 NETWORK 14 FN6202.1 December 20, 2005 ISL81334, ISL41334 GENERIC 422 Rx (SLAVE) RO RE GENERIC FULL DUPLEX 422 XCVR (SLAVE) +5V R 0.1µF VCC D DY DE Y RT B Z +5V VCC GND B A RT A VCC R RO 0.1µF + + +5V ISLX1334 (MASTER) 1kΩ OR NC + 0.1µF A RA R B GND Z DI Y GND D FIGURE 10. TYPICAL RS-422 NETWORK RS-232 is a point-to-point, singled ended (signal voltages referenced to GND) communication protocol targeting fairly short (