LTC1335IN

LTC1321/LTC1322/LTC1335 RS232/EIA562/RS485 Transceivers FEATURES s s DESCRIPTIO s s s s s s s s s s s s s LTC1321: 2-EIA562/RS232 Transceivers/2-RS485 Transceivers LTC1322: 4-EIA562/RS232 Transceivers/2-RS485 Transceivers LTC1335: 4-EIA562 Transceivers/2-RS485 Transceivers with OE LTC1321/LTC1322 Have the Same Pinout as SP301/SP302 LTC1335 Features Receiver Three-State Outputs Low Supply Current: 1mA Typical 15µA Supply Current in Shutdown 120kBaud in EIA/TIA-562 or RS232 Mode 10MBaud in RS485/RS422 Mode Self-Testing Capability in Loopback Mode Power-Up/Down Glitch-Free Outputs Driver Maintains High Impedance in Three-State, Shutdown or With Power Off Thermal Shutdown Protection I/O Lines Can Withstand ± 25V Withstands Repeated 10kV ESD Pulses The LTC1321/LTC1322/LTC1335 are low power CMOS bidirectional transceivers, each featuring two reconfigurable interface ports. Each can be configured as two RS485 differential ports, as two single-ended ports, or as one RS485 differential port and one single-ended port. The LTC1321/LTC1322 can provide RS232 or EIA562 compatible single-ended outputs; the LTC1335 provides EIA562 compatible outputs and additionally includes an output enable pin, allowing the receiver logic level outputs to be three-stated. The RS232/EIA562 transceivers operate to 120kbaud and are in full compliance with EIA/TIA-562 specification. The RS485 transceivers operate to 10Mbaud and are in full compliance with RS485 and RS422 specifications. All interface drivers feature short-circuit and thermal shutdown protection. An enable pin allows RS485 driver outputs to be forced into high impedance which is maintained even when the outputs are forced beyond supply rails or power is off. Both driver outputs and receiver inputs feature ±10kV ESD protection. A loopback mode connects the driver outputs back to the receiver inputs for diagnostic self-test. The LTC1321/LTC1322 can support RS232 voltage levels when 6.5V ≤ VDD ≤ 10V and – 6.5V ≥ VEE ≥ – 10V. The LTC1335 supports receiver output enable but not RS232 levels. A shutdown mode reduces the ICC supply current to 15µA. APPLICATIONS s s s Low Power RS485/RS422/EIA562/RS232 Interface Cable Repeater Level Translator TYPICAL APPLICATI VCC1 5V RX OUT DR ENABLE DR IN 5V 5V DR IN DR IN RX OUT RX OUT VEE1 – 5V 24 1 22 21 20 19 18 17 16 15 14 13 2 3 120Ω 4 5 6 LTC1322 7 8 9 10 11 12 5V 0V RS485 INTERFACE 120Ω 11 10 9 8 5V 7 6 3 2 5 4 12 LTC1322 4000-FT 24-GAUGE TWISTED PAIR EIA562 INTERFACE 0V U 24 1 15 16 17 19 18 22 23 20 21 13 VCC2 5V RX OUT DR ENABLE DR IN 5V 5V RX OUT RX OUT DR IN DR IN VEE2 – 5V 1321/22/35 TA01 UO U 1 LTC1321/LTC1322/LTC1335 ABSOLUTE AXI U RATI GS Output Voltage Drivers ................................................. – 25V to 25V Receivers ............................... – 0.3V to (VCC + 0.3V) Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range LTC1321C/LTC1322C/LTC1335C ......... 0°C to 70°C LTC1321I/LTC1322I/LTC1335I ......... – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................ 300°C Supply Voltage VCC .................................................................... 6.5V VDD (LTC1321/LTC1322 Only) ........................... 10V VEE ................................................................... – 10V Input Voltage Drivers ................................... – 0.3V to (VCC + 0.3V) Receivers ............................................. – 25V to 25V ON/OFF, LB, SEL1, SEL2, OE ............................ – 0.3V to (VCC + 0.3V) PACKAGE/ORDER I FOR ATIO 2 RS485 DRIVERS/RECEIVERS 2 EIA/TIA-562 DRIVERS/RECEIVERS 2 RS485 DRIVERS/RECEIVERS 4 EIA/TIA-562 DRIVERS/RECEIVERS TOP VIEW VDD B1 A1 Z1 Y1 SEL1 SEL2 Y2 Z2 1 2 3 4 5 6 7 8 9 24 VCC 23 NC 22 RA1 21 DE1 20 DY1 19 LB 18 ON/OFF 17 DY2 16 DE2 15 RA2 14 NC 13 VEE S PACKAGE 24-LEAD PLASTIC SOL VDD B1 A1 Z1 Y1 SEL1 SEL2 Y2 Z2 1 2 3 4 5 6 7 8 9 A2 10 B2 11 GND 12 N PACKAGE 24-LEAD PLASTIC DIP A2 10 B2 11 GND 12 N PACKAGE 24-LEAD PLASTIC DIP TJMAX = 125°C, θJA = 75°C/W (N) TJMAX = 125° C, θJA = 85°C/W (S) TJMAX = 125°C, θJA = 75°C/W (N) TJMAX = 125° C, θJA = 85°C/W (S) ORDER PART NUMBER LTC1321CN LTC1321CS LTC1321IN LTC1321IS Consult factory for Military grade parts. ORDER PART NUMBER LTC1322CN LTC1322CS LTC1322IN LTC1322IS 2 U U W WW U W 2 RS485 DRIVERS/RECEIVERS 4 EIA/TIA-562 DRIVERS/RECEIVERS TOP VIEW 24 VCC 23 RB1 22 RA1 21 DZ1/DE1 20 DY1 19 LB 18 ON/OFF 17 DY2 16 DZ2 /DE2 15 RA2 14 RB2 13 VEE S PACKAGE 24-LEAD PLASTIC SOL OE B1 A1 Z1 Y1 SEL1 SEL2 Y2 Z2 1 2 3 4 5 6 7 8 9 TOP VIEW 24 VCC 23 RB1 22 RA1 21 DZ1/DE1 20 DY1 19 LB 18 ON/OFF 17 DY2 16 DZ2 /DE2 15 RA2 14 RB2 13 VEE S PACKAGE 24-LEAD PLASTIC SOL A2 10 B2 11 GND 12 N PACKAGE 24-LEAD PLASTIC DIP TJMAX = 125°C, θJA = 75°C/W (N) TJMAX = 125° C, θJA = 85°C/W (S) ORDER PART NUMBER LTC1335CN LTC1335CS LTC1335IN LTC1335IS LTC1321/LTC1322/LTC1335 DC ELECTRICAL CHARACTERISTICS VCC = VDD (LTC1321/LTC1322) = 5V ± 5%, VEE = – 5V ± 5% (Notes 2, 3) SYMBOL VOD1 VOD2 ∆VOD VOC ∆VOC IOSD IOZD VO IOSD VIH VIL IIN PARAMETER Differential Driver Output Voltage (Unloaded) Differential Driver Output Voltage (With Load) Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Driver Common-Mode Output Voltage Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States Driver Short-Circuit Current Three-State Output Current (Y, Z) Output Voltage Swing Output Short-Circuit Current Input High Voltage Input Low Voltage Input Current CONDITIONS IO = 0 Figure 1, R = 50Ω (RS422) Figure 1, R = 27Ω (RS485) Figure 1, R = 27Ω or R = 50Ω Figure 1, R = 27Ω or R = 50Ω Figure 1, R = 27Ω or R = 50Ω – 7V ≤ VO ≤ 12V, VO = HIGH – 7V ≤ VO ≤ 12V, VO = LOW (Note 4) – 7V ≤ VO ≤ 12V Figure 4, RL = 3k, Positve Figure 4, RL = 3k, Negative VO = 0V D, DE, ON/OFF, SEL1, SEL2, LB OE (LTC1335) D, DE, ON/OFF, SEL1, SEL2, LB OE (LTC1335) D, SEL1, SEL2 DE, ON/OFF, LB OE (LTC1335) – 7V ≤ VCM ≤ 7V, Commercial – 7V ≤ VCM ≤ 7V, Industrial VCM = 0V – 7V ≤ VIN ≤ 12V – 7V ≤ VIN ≤ 12V Input Low Threshold Input High Threshold VIN = ± 10V IO = – 3mA, VIN = 0V, SEL1 = SEL2 = LOW IO = 3mA, VIN = 3V, SEL1 = SEL2 = LOW 0V ≤ VO ≤ VCC ON/OFF = 0V OE = VCC (LTC1335) q q q q q q q q q q q q q q MIN TYP MAX 5 UNITS V V V V V V mA mA µA V V RS485 Driver (SEL1 = SEL2 = HIGH) 2.0 1.5 5 5 0.2 3 0.2 35 10 ±5 3.7 – 3.7 4.2 – 4.3 ± 11 2 2 0.8 0.8 –4 4 ± 10 – 15 15 ± 60 250 250 ± 500 EIA/TIA-562 Driver (SEL1 = SEL2 = LOW) q q q mA V V V V µA µA µA V V mV mA kΩ V V V kΩ V Driver Inputs and Control Inputs q q q q q q q RS485 Receiver (SEL1 = SEL2 = HIGH) VTH ∆VTH IIN RIN VTH ∆VTH RIN VOH VOL IOSR IOZR Differential Input Threshold Voltage Input Hysteresis Input Current (A, B) Input Resistance Receiver Input Voltage Threshold Receiver Input Hysteresis Receiver Input Resistance Receiver Output High Voltage Receiver Output Low Voltage Short-Circuit Current Three-State Output Current q q q q q – 0.2 – 0.3 70 0.2 0.3 ±1 12 0.8 0.1 3 3.5 7 24 1.1 1.7 0.6 5 4.6 0.2 0.4 85 ± 10 ± 10 EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW) q q q 2.4 1.0 7 Receiver Output V mA µA µA 3 LTC1321/LTC1322/LTC1335 DC ELECTRICAL CHARACTERISTICS VCC = VDD (LTC1321/LTC1322) = 5V ± 5%, VEE = – 5V ± 5% (Notes 2, 3) SYMBOL ICC IDD IEE PARAMETER VCC Supply Current VDD Supply Current (LTC1321/LTC1322) VEE Supply Current CONDITIONS No Load (SEL1 = SEL2 = HIGH) Shutdown, ON/OFF = 0V No Load (SEL1 = SEL2 = LOW) Shutdown, ON/OFF = 0V No Load (SEL1 = SEL2 = HIGH) Shutdown, ON/OFF = 0V q q q q q q MIN TYP 1000 15 300 0.1 – 1000 – 0.1 MAX 2000 50 1000 50 – 2000 – 50 UNITS µA µA µA µA µA µA Supply Currents AC ELECTRICAL CHARACTERISTICS DC SYMBOL SR tT t PLH t PHL t PLH t PHL t PLH t PHL t SKEW t r, tf t ZL t ZH tLZ tHZ t PLH t PHL tSKEW tZL tZH tLZ tHZ PARAMETER Slew Rate Transition Time Driver Input to Output Driver Input to Output Receiver Input to Output Receiver Input to Output Driver Input to Output Driver Input to Output Driver Output to Output Driver Rise or Fall Time Driver Enable to Output Low Driver Enable to Output High Driver Disable from Low Driver Disable from High Receiver Input to Output Receiver Input to Output Differential Receiver Skew, tPLH-tPHL Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from Low Receiver Disable from High EIA/TIA-562 Mode (SEL1 = SEL2 = LOW) VCC = VDD (LTC1321/LTC1322) = 5V ± 5%, VEE = – 5V ± 5% (Notes 2, 3) CONDITIONS Figure 4, RL = 3k, CL = 15pF Figure 4, RL = 3k, CL = 1000pF Figure 4, RL = 3k, CL = 2500pF Figures 4,10, RL = 3k, CL = 15pF Figures 4,10, RL = 3k, CL = 15pF Figures 5,11 Figures 5,11 Figures 2,7, RL = 54Ω, CL = 100pF Figures 2,7, RL = 54Ω, CL = 100pF Figures 2,7, RL = 54Ω, CL = 100pF Figures 2,7, RL = 54Ω, CL = 100pF Figures 3,8, CL = 100pF, S1 Closed Figures 3,8, CL = 100pF, S2 Closed Figures 3,8, CL = 15pF, S1 Closed Figures 3,8, CL = 15pF, S2 Closed Figures 2,9, RL = 54Ω, CL = 100pF Figures 2,9, RL = 54Ω, CL = 100pF Figures 2,9, RL = 54Ω, CL = 100pF Figures 6,12, CL = 15pF, S1 Closed Figures 6,12, CL = 15pF, S2 Closed Figures 6,12, CL = 15pF, S1 Closed Figures 6,12, CL = 15pF, S2 Closed q q q q q q q MIN TYP 14 7 1.9 0.6 0.6 0.3 0.4 MAX 30 3.1 4 4 6 6 70 70 15 40 90 90 90 90 140 140 UNITS V/µs V/µs µs µs µs µs µs ns ns ns ns ns ns ns ns ns ns ns 4 0.22 RS485 Mode (SEL1 = SEL2 = HIGH) q q q q q q q q q q q 20 20 3 40 40 5 15 50 50 50 60 20 20 60 70 10 40 40 40 50 Receiver Output Enable/Disable (LTC1335) q q q q 90 90 90 90 ns ns ns ns The q denotes specifications which apply over the full operating temperature range. Note 1: Absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. Note 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. Note 3: All typicals are given at VCC = VDD (LTC1321/LTC1322) = 5V, VEE = – 5V, and TA = 25°C. Note 4: Short-circuit current for RS485 driver output low state folds back above VCC. Peak current occurs around VO = 3V. 4 LTC1321/LTC1322/LTC1335 TYPICAL PERFORMANCE CHARACTERISTICS RS485 Driver Differential Output Voltage vs Temperature 2.6 DIFFERENTIAL OUTPUT VOLTAGE (V) 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 DIFFERENTIAL OUTPUT CURRENT (mA) RL = 54Ω 40 30 20 TIME (µs) 1.6 –50 –25 50 25 0 75 TEMPERATURE (°C) RS485 Driver Output High Voltage vs Output Current –80 TA = 25°C –70 100 120 OUTPUT SHORT-CIRCUIT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) –60 –50 –40 –30 –20 –10 0 0 1 3 OUTPUT VOLTAGE (V) 2 4 5 1321 G04 EIA562 Driver Output Voltage vs Temperature 5 4 3 OUTPUT VOLTAGE (V) OUTPUT HIGH OUTPUT VOLTAGE (V) 8 6 4 2 0 –2 –4 –6 RL = 3k TA = 25°C VEE = – VDD OUTPUT SHORT-CIRCUIT CURRENT (mA) 2 1 0 –1 –2 –3 –4 –5 –50 –25 OUTPUT LOW 50 25 0 75 TEMPERATURE (°C) 100 125 RL = 3k UW 100 125 1321 G01 RS485 Driver Differential Output Current vs Output Voltage 70 TA = 25°C 60 12 15 RS485 Driver Skew vs Temperature 50 9 6 3 10 0 0 3 4 DIFFERENTIAL OUTPUT VOLTAGE (V) 1 2 5 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1321 G02 1321 G03 RS485 Driver Output Low Voltage vs Output Current 160 TA = 25°C RS485 Driver Output Short-Circuit Current vs Temperature 140 120 100 80 60 40 –50 –25 80 60 40 20 0 SINK (VOUT = 5V) SOURCE (VOUT = 0V) 0 1 2 3 4 OUTPUT VOLTAGE (V) 5 1321 G05 50 25 75 0 TEMPERATURE (°C) 100 125 1321 G19 EIA562 Driver Output Voltage vs Supply Voltage 10 18 EIA562 Driver Output Short-Circuit Current vs Temperature VOUT = 0V 16 14 12 10 SINK 8 6 –50 –25 SOURCE OUTPUT HIGH OUTPUT LOW –8 –10 4 5 7 8 9 6 VDD SUPPLY VOLTAGE (V) 10 1321 G08 50 25 75 0 TEMPERATURE (°C) 100 125 1321 G07 1321 G09 5 LTC1321/LTC1322/LTC1335 TYPICAL PERFORMANCE CHARACTERISTICS Receiver Output High Voltage vs Temperature 5.0 4.9 4.8 IOUT = 3mA 0.4 0.5 IOUT = 3mA OUTPUT VOLTAGE (V) 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 OUTPUT VOLTAGE (V) TIME (ns) 125 Receiver Output Current vs Output High Voltage 120 18 16 OUTPUT CURRENT (mA) 14 12 10 8 6 4 2 0 2.0 2.5 3.5 4.0 3.0 OUTPUT VOLTAGE (V) 4.5 5.0 1321 G13 TA = 25°C OUTPUT CURRENT (mA) INPUT THRESHOLD VOLTAGE (V) Driver Output Leakage Current (Disable/Shutdown) vs Temperature ±400 OUTPUT LEAKAGE CURRENT (µA) ±350 SUPPLY CURRENT (mA) ±250 ±200 ±150 ±100 ±50 0 –50 –25 0 25 50 75 100 125 0.8 0.6 0.4 0.2 0 –50 –25 –IEE SUPPLY CURRENT (µA) ±300 TEMPERATURE (°C) 1321 G06 6 UW 1321 G10 Receiver Output Low Voltage vs Temperature 20 18 16 14 0.3 12 10 8 6 0.1 4 2 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 RS485 Receiver tPLH – tPHL vs Temperature 0.2 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1321 G11 1321 G12 Receiver Output Current vs Output Low Voltage 40 TA = 25°C 35 30 25 20 15 10 5 0 0 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) 2.5 3.0 1321 G14 EIA562 Receiver Input Threshold Voltage vs Temperature 2.0 1.8 1.6 1.4 1.2 1.0 0.8 –50 –25 INPUT HIGH INPUT LOW 50 25 75 0 TEMPERATURE (°C) 100 125 1321 G15 Supply Current in RS485 Mode vs Temperature (Both Ports) 1.2 ICC 1.0 Supply Current in EIA562 Mode vs Temperature (Both Ports) 500 450 400 350 300 250 200 150 100 50 –IDD ICC RL = ∞ –IEE RL = ∞ –IDD 50 25 75 0 TEMPERATURE (°C) 100 125 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1321 G17 1321 G18 LTC1321/LTC1322/LTC1335 PI FU CTIO S LTC1321 VDD (Pin 1): Positive Supply Input for EIA/TIA-562 Drivers. B1: (Pin 2): Receiver Input. A1 (Pin 3): Receiver Input. Z1 (Pin 4): Driver Output. Y1 (Pin 5): Driver Output. SEL1 (Pin 6): Interface Mode Select Input. SEL2 (Pin 7): Interface Mode Select Input. Y2 (Pin 8): Driver Output. Z2 (Pin 9): Driver Output. A2 (Pin 10): Receiver Input. B2 (Pin 11): Receiver Input. GND (Pin 12): Ground. VEE (Pin 13): Negative Supply. NC (Pin 14): No Connection. RA2 (Pin 15): Receiver Output. DE2 (Pin 16): Driver Enable with Internal Pull-Up in RS485 Mode. DY2 (Pin 17): Driver Input. ON/OFF (Pin 18): A HIGH logic input enables the transceivers. A LOW puts the device into shutdown mode and reduces ICC to 15µA. This pin has an internal pull-up. LB (Pin 19): Loopback Control Input. A LOW logic level enables loopback connections. This pin has an internal pull-up. DY1 (Pin 20): Driver Input. DE1 (Pin 21): Driver Enable with Internal Pull-Up in RS485 Mode. RA1 (Pin 22): Receiver Output. NC (Pin 23): No Connection. VCC (Pin 24): Positive Supply; 4.75V ≤ VCC ≤ 5.25V. U U U LTC1322/LTC1335 OE/VDD (Pin 1): For LTC1335, pin 1 is the receiver output enable with internal pull-down. For LTC1322, pin 1 is the positive supply input for EIA/TIA-562 drivers. B1: (Pin 2): Receiver Input. A1 (Pin 3): Receiver Input. Z1 (Pin 4): Driver Output. Y1 (Pin 5): Driver Output. SEL1 (Pin 6): Interface Mode Select Input. SEL2 (Pin 7): Interface Mode Select Input. Y2 (Pin 8): Driver Output. Z2 (Pin 9): Driver Output. A2 (Pin 10): Receiver Input. B2 (Pin 11): Receiver Input. GND (Pin 12): Ground. VEE (Pin 13): Negative Supply. RB2 (Pin 14): Receiver Output. RA2 (Pin 15): Receiver Output. DZ2/DE2 (Pin 16): EIA/TIA-562 Driver Input in EIA562 Mode. RS485 Driver Enable with Internal Pull-Up in RS485 Mode. DY2 (Pin 17): Driver Input. ON/OFF (Pin 18): A HIGH logic input enables the transceivers. A LOW puts the device into shutdown mode and reduces ICC to 15µA. This pin has an internal pull-up. LB (Pin 19): Loopback Control Input. A LOW logic level enables loopback connections. This pin has an internal pull-up. DY1 (Pin 20): Driver Input. DZ1/DE1 (Pin 21): EIA/TIA-562 Driver Input in EIA562 Mode. RS485 Driver Enable with Internal Pull-up in RS485 Mode. RA1 (Pin 22): Receiver Output. RB1 (Pin 23): Receiver Output. VCC (Pin 24): Positive Supply; 4.75V ≤ VCC ≤ 5.25V. 7 LTC1321/LTC1322/LTC1335 FU CTIO TABLES LTC1321 RS485 Driver Mode ON/OFF 1 1 1 1 0 INPUTS SEL DE 1 1 1 1 1 1 1 1 0 X D 0 1 X X X LINE CONDITION No Fault No Fault Fault X X OUTPUTS Y Z 0 1 Z Z Z 1 0 Z Z Z RS485 Receiver Mode ON/OFF 1 1 1 0 INPUTS SEL 1 1 1 1 A–B < – 0.2V > 0.2V Inputs Open X OUTPUT R 0 1 1 Z RS232/EIA562 Driver Mode ON/OFF 1 1 1 0 INPUTS SEL 0 0 0 0 D 0 1 X X LINE CONDITION No Fault No Fault Fault X OUTPUT Y 1 0 Z Z RS232/EIA562 Receiver Mode ON/OFF 1 1 1 0 INPUTS SEL 0 0 0 0 A 0 1 Inputs Open X OUTPUT R 1 0 1 Z 8 U U LTC1322 RS485 Driver Mode ON/OFF 1 1 1 1 0 INPUTS SEL DE 1 1 1 1 1 1 1 1 0 X D 0 1 X X X LINE CONDITION No Fault No Fault Fault X X OUTPUTS Y Z 0 1 Z Z Z 1 0 Z Z Z RS485 Receiver Mode ON/OFF 1 1 1 0 INPUTS SEL 1 1 1 1 A–B < – 0.2V > 0.2V Inputs Open X OUTPUT R 0 1 1 Z RS232/EIA562 Driver Mode ON/OFF 1 1 1 0 INPUTS SEL 0 0 0 0 D 0 1 X X LINE CONDITION No Fault No Fault Fault X OUTPUT Y, Z 1 0 Z Z RS232/EIA562 Receiver Mode ON/OFF 1 1 1 0 INPUTS SEL 0 0 0 0 A OR B 0 1 Input Open X OUTPUT R 1 0 1 Z LTC1321/LTC1322/LTC1335 FU CTIO TABLES LTC1335 RS485 Driver Mode ON/OFF 1 1 1 1 0 INPUTS SEL DE 1 1 1 1 1 1 1 1 0 X D 0 1 X X X LINE CONDITION No Fault No Fault Fault X X OUTPUTS Y Z 0 1 Z Z Z 1 0 Z Z Z RS485 Receiver Mode INPUTS ON/OFF 1 1 1 1 0 SEL 1 1 1 1 1 OE 0 0 0 1 X A–B < – 0.2V > 0.2V Inputs Open X X OUTPUT R 0 1 1 Z Z BLOCK DIAGRA SM LTC1321 Interface Configuration Without Loopback PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 1 24 3 5 6 22 20 19 PORT 1 = RS485 MODE PORT 2 = EIA562 MODE 1 24 2 3 4 5 6 7 18 8 10 12 17 15 13 ON DY2 A2 RA2 VEE B2 GND 22 21 20 19 PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 1 24 3 5 6 22 20 19 18 17 1 16 10 11 12 15 13 PORT 1 = RS485 MODE PORT 2 = RS485 MODE 24 1 2 22 3 4 5 6 7 8 9 10 11 12 21 20 19 18 17 16 15 13 VDD A1 Y1 SEL1 VCC RA1 DY1 LB SEL2 Y2 A2 GND 7 8 10 12 18 ON DY2 RA2 VEE 17 15 13 * SEL1/SEL2 = VCC W U U EIA562 Driver Mode ON/OFF 1 1 1 0 INPUTS SEL 0 0 0 0 D 0 1 X X LINE CONDITION No Fault No Fault Fault X OUTPUT Y, Z 1 0 Z Z EIA562 Receiver Mode INPUTS ON/OFF 1 1 1 1 0 SEL 0 0 0 0 0 OE 0 0 0 1 X A OR B 0 1 Input Open X X OUTPUT R 1 0 1 Z Z VDD B1 A1 Z1 Y1 *SEL1 SEL2 Y2 A2 GND VCC RA1 DE1 DY1 LB VDD A1 Y1 SEL1 VCC RA1 DY1 LB ON DY2 DE2 RA2 VEE VDD B1 A1 Z1 Y1 *SEL1 *SEL2 Y2 Z2 A2 B2 GND VCC RA1 DE1 DY1 LB ON DY2 DE2 RA2 VEE *SEL2 Y2 Z2 7 8 9 1321BD01 9 LTC1321/LTC1322/LTC1335 BLOCK DIAGRA SM LTC1321 Interface Configuration With Loopback VDD PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 1 24 22 5 6 20 19 VCC RA1 Y1 SEL1 DY1 LB Y1 *SEL1 5 6 7 SEL2 Y2 7 8 18 ON DY2 RA2 VEE 17 15 GND 12 13 *SEL1/SEL2 = VCC *VDD /OE PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 24 1* VCC B1 A1 Z1 Y1 SEL1 SEL2 Y2 Z2 A2 B2 GND 2 3 4 5 6 23 22 21 20 19 RB1 RA1 DZ1 DY1 LB ON DY2 DZ2 RA2 RB2 VEE Z1 Y1 **SEL1 SEL2 A1 3 7 8 9 10 11 12 18 17 16 15 14 13 * FOR LTC1322 ONLY, PIN 1 IS VDD, AND OE IS ALWAYS ENABLED. FOR LTC1335, PIN 1 IS OE, AND VDD IS CONNECTED TO VCC. ** SEL1/SEL2 = VCC. 10 W VDD Z1 PORT 1 = RS485 MODE PORT 2 = EIA562 MODE 1 24 4 22 21 20 19 18 8 17 15 VCC RA1 DE1 DY1 LB ON DY2 VDD PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 1 24 22 5 6 7 8 20 19 18 17 16 VCC RA1 DY1 LB ON DY2 DE2 RA2 VEE VDD Z1 PORT 1 = RS485 MODE PORT 2 = RS485 MODE 1 24 4 22 21 VCC RA1 DE1 DY1 LB ON DY2 DE2 RA2 VEE Y1 SEL1 *SEL2 Y2 Y1 *SEL1 *SEL2 Y2 5 6 7 8 20 19 18 17 16 15 13 SEL2 Y2 Z2 RA2 VEE GND 9 12 15 13 Z2 GND 9 12 GND 12 13 1321 BD02 LTC1322/LTC1335 Interface Configuration Without Loopback PORT 1 = RS485 MODE PORT 2 = EIA562 MODE *VDD /OE B1 1 2 * 24 23 VCC RB1 B1 RA1 DE1 DY1 LB **SEL2 8 9 10 11 12 18 17 16 15 14 13 ON DY2 DZ2 RA2 RB2 VEE Y2 Z2 A2 B2 GND A1 Z1 Y1 SEL1 2 3 4 5 6 19 7 8 9 16 10 11 12 15 14 13 18 17 23 22 21 20 RB1 RA1 DZ1 DY1 LB ON DY2 DE2 RA2 RB2 VEE A2 B2 GND 10 11 12 A1 Z1 Y1 **SEL1 **SEL2 Y2 Z2 3 4 5 6 7 8 9 16 15 14 13 *VDD /OE PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 24 1* PORT 1 = RS485 MODE PORT 2 = RS485 MODE 24 1* 2 23 VCC *VDD /OE B1 VCC RB1 RA1 DE1 DY1 LB ON DY2 DE2 RA2 RB2 VEE 22 21 22 21 20 19 18 17 4 5 6 7 20 19 Y2 Z2 A2 B2 GND 1322/35 BD01 LTC1321/LTC1322/LTC1335 BLOCK DIAGRA SM LTC1322/LTC1335 Interface Configuration With Loopback PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 24 1* PORT 1 = RS485 MODE PORT 2 = EIA562 MODE VCC *VDD /OE 1 * 24 23 23 22 Z1 Y1 SEL1 SEL2 Y2 Z2 4 5 6 7 8 9 18 17 16 15 14 13 21 20 19 RB1 RA1 DZ1 DY1 LB ON DY2 DZ2 RA2 RB2 VEE 12 Y1 **SEL1 SEL2 5 6 7 8 9 Z1 4 VCC RB1 23 22 21 20 19 18 17 16 15 14 13 RA1 DE1 DY1 LB **SEL2 ON DY2 DZ2 RA2 RB2 VEE Z2 9 15 12 14 13 Y2 7 8 18 17 16 ON DY2 DE2 RA2 RB2 VEE Z2 9 **SEL2 Y2 Z1 Y1 SEL1 4 5 6 22 21 20 19 RB1 RA1 DZ1 DY1 LB Y1 **SEL1 5 6 7 8 Z1 4 *VDD /OE PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 24 1* PORT 1 = RS485 MODE PORT 2 = RS485 MODE 24 1* 23 *VDD /OE GND 12 * FOR LTC1322 ONLY, PIN 1 IS VDD, AND OE IS ALWAYS ENABLED. FOR LTC1335, PIN 1 IS OE, AND VDD IS CONNECTED TO VCC. ** SEL1/SEL2 = VCC. TEST CIRCUITS VCC Y 3V 3V SEL Y RL DE Z CL B 0V 1321/22/35 F03 R VOD R Z VOC 3V D 1321/22/35 F01 Figure 1. RS485 Driver Test Load 0V D SEL Y OR Z D 0V SEL Y OR Z A OR B OE 15pF 0V 1321/22/35 F04 1321/22/35 F05 CL RL Figure 4. EIA/TIA-562 Driver Timing Test Circuit W VCC *VDD /OE VCC RB1 22 21 20 19 18 17 16 15 14 13 RA1 DE1 DY1 LB ON DY2 DE2 RA2 RB2 VEE Y2 Z2 GND GND GND 12 1322/35 BD02 S1 500Ω DR OUT CL A SEL R OE 15pF CL S2 1321/22/35 F02 Figure 2. RS485 Driver/Receiver Timing Test Circuit Figure 3. RS485 Driver Output Enable/Disable Timing Test Load VCC 0V SEL R S1 1k RX OUT CL S2 1321/22/35 F06 Figure 5. EIA/TIA-562 Receiver Timing Test Circuit Figure 6. Receiver Output Enable/Disable Timing Test Load 11 LTC1321/LTC1322/LTC1335 SWITCHI G WAVEFOR S 3V D 0V tPLH VO Y–Z –VO Z VO Y tSKEW tSKEW 1321/22/35 F07 3V DE 0V tZL 5V Y OR Z VOL tZH VOH Y OR Z 0V 1.5V Figure 8. RS485 Driver Enable and Disable Times V OD2 A–B –V OD2 tPLH VOH R VOL 0V 3V D 0V tPHL VO Y OR Z –VO 0V 0V 1321/22/35 F10 Figure 10. EIA/TIA-562 Driver Propagation Delays 12 W 1.5V U f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V tPHL 90% 50% 10% tr VDIFF = V(Y) – V(Z) 90% 50% 10% tf 1/2 VO Figure 7. RS485 Driver Propagation Delays f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V tLZ 2.3V OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH 2.3V 1321/22/35 F08 0.5V tHZ 0.5V f = 1MHz: tr ≤ 10ns: tf ≤ 10ns INPUT 0V tPHL 1.5V 1321/22/35 F09 OUTPUT 1.5V Figure 9. RS485 Receiver Propagation Delays 1.5V 1.5V tPLH LTC1321/LTC1322/LTC1335 SWITCHI G WAVEFOR S V IH A OR B VIL tPHL VOH R VOL 0.8V tPLH 2.4V 1321/22/35 F11 Figure 11. EIA/TIA-562 Receiver Propagation Delays 3V OE 0V tZL 5V R VOL tZH VOH R 0V 1321/22/35 F12 APPLICATI S I FOR ATIO Basic Theory of Operation The LTC1321/LTC1322/LTC1335 each have two interface ports. Each port may be configured as single-ended EIA562 transceiver(s) or differential RS485 transceiver by forcing the port’s selection input to a LOW or HIGH, respectively. The LTC1321 provides one EIA562 driver and one EIA562 receiver per port to maintain same pinout as SP301. The LTC1322 and LTC1335 each provide two drivers and two receivers per port. Additionally, the LTC1321 and LTC1322 single-ended ports are RS232 compatible with higher VDD and VEE supply levels. All the interface drivers feature three-state outputs. Interface outputs are forced into high impedance when the driver is disabled, in the shutdown mode, or with the power off. All the interface driver outputs are fault protected by a current limiting and thermal shutdown circuit. The thermal shutdown circuit disables both the EIA562 and RS485 driver outputs when the die temperature reaches 150°C. The thermal shutdown circuit enables the drivers when the die temperature cools to 135°C. U W W U UO U 1.3V 1.7V 1.5V f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V tLZ 1.5V OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH 1.5V tHZ 0.5V 0.5V Figure 12. Receiver Enable and Disable Times In RS485 mode, shutdown mode or with the power off, the input resistance of the receiver is 24k. The input resistance drops to 6.3k in EIA562 mode. A logic LOW at the ON/OFF pin shuts down the device and forces all the outputs into a high impedance state. A logic HIGH enables the device. An internal 4µA current source to VCC pulls the ON/OFF pin HIGH if left open. In RS485 mode, an internal 4µA current source pulls the driver enable pin HIGH if left open. The RS485 receiver has a 4µA current source at the noninverting input. If both the RS485 receiver inputs are open, the output is a high state. Both the current sources are disabled in the EIA562 mode. For LTC1335, a logic LOW at the OE pin enables all the receiver outputs and a logic HIGH disables all the receiver outputs. An internal 4µA current source pulls the OE pin LOW if left open. A loopback mode enables internal connections from driver outputs to receiver inputs for self-test when the 13 LTC1321/LTC1322/LTC1335 APPLICATI S I FOR ATIO LB pin has a LOW logic state. The driver outputs are not isolated from the external loads. This allows transmitter verification under the loaded condition. An internal 4µA current source pulls the LB pin HIGH if left open and disables the loopback configuration. EIA562/RS485 Applications EIA562 and RS485 output levels are supported when LTC1321/LTC1322/LTC1335 are powered from ± 5V supplies. The LTC1321/LTC1322 require the VDD and VCC pins to be tied together and connected to 5V supply (Figure 13). The VDD and VCC are connected internally and brought out at VCC pin in the LTC1335. The unloaded outputs will swing from – 5V to 5V in EIA562 mode, and from 0V to 5V in RS485 mode. RS232/RS485 Applications If true RS232-compatible outputs are required, the LTC1321/LTC1322 may be used with the VDD and VEE supply voltages increased to provide the additional signal swing. To meet RS232, VDD must be between 6.5V and 10V, and VEE must be between – 6.5V and – 10V. VCC remains connected to 5V. If only ±12V supplies are available, inexpensive Zener diodes (Z1 and Z2) may be connected in series with VDD and VEE supply pins as shown in Figure 14. An optional 16V Zener diode between VCC and VEE is recommended to keep the maximum voltage between VCC and VEE within safe limits. LocalTalk®/AppleTalk® Applications The LTC1321/LTC1322/LTC1335 can be used to provide AppleTalk/LocalTalk-compatible signals in RS485 mode. Figure 15 shows one half of an LTC1335 connected to an LTC1320 AppleTalk transceiver in a typical LocalTalk configuration. Figure 16 shows a typical direct-wire connection with the LTC1335 as the DCE transceiver and the LTC1320 as the DTE transceiver. The LTC1321/LTC1322/ LTC1335 RS485 mode is capable of meeting all AppleTalk protocol specifications. LocalTalk and AppleTalk are registered trademarks of Apple Computer, Inc. 14 U LTC1321/LTC1322 ONLY VCC 5V 24 0.1µF RX OUT DR ENABLE DR IN 5V 5V DR IN DR IN RX OUT RX OUT VEE –5V 0.1µF 1321/22/35 F13 W U UO 22 21 20 19 18 17 16 15 14 13 LTC1321 LTC1322 LTC1335 1 2 3 4 5 6 7 8 9 10 11 12 5V 0V VDD (LTC1321/LTC1322) OR OE (LTC1335) 120Ω RS485 I/O EIA562 DR OUT EIA562 DR OUT (LTC1322/LTC1335 ONLY) EIA562 RX IN EIA562 RX IN (LTC1322/LTC1335 ONLY) Figure 13. EIA562/RS485 Interfaces with ± 5V Supplies V+ 12V Z1 1N5229B 4.3V 0.1µF 120Ω RS485 I/O VCC 5V 24 0.1µF RX OUT DR ENABLE DR IN Z3* 1N5246B 16V 5V 5V DR IN DR IN RX OUT VEE RX OUT 22 21 20 19 18 17 16 15 14 13 0.1µF LTC1321 LTC1322 1 VDD 2 3 4 5 6 7 8 9 10 11 12 5V 0V RS232 DR OUT RS232 DR OUT (LTC1322 ONLY) RS232 RX IN RS232 RX IN (LTC1322 ONLY) V – 12V – Z2 1N5229B 4.3V 1321/22/35 F14 *OPTIONAL Figure 14. RS232/RS485 Interfaces with 5V, ± 12V Supplies LTC1321/LTC1322/LTC1335 APPLICATI S I FOR ATIO TXD TXI 1 2 5V 17 TXD – 16 TXD + 15 14 13 12 5V 18 RFI 120Ω RFI 1k 1k RFI = 22Ω 22Ω 100pF 120Ω TXDEN RXEN RXO RXO RXDO 3 4 5 6 7 8 9 LTC1320 – 11 RXD + RFI 10 RXD RFI Figure 15. Apple LocalTalk Implemented Using LTC1320 and LTC1335 Transceivers TXD TXI 1 2 3 18 5V 17 TXD – 16 TXD + 15 TXO – 5V 13 RXI 12 RXI 11 RXD – LTC1320 10 RXD + 14 RFI 120Ω RFI RFI 120Ω RFI RFI RFI 120Ω RFI 22Ω 100pF RFI RFI RFI SEL1, 5V SEL2 RFI 120Ω RFI RFI RFI TXDEN 4 RXEN RXO RXO RXDO 5 6 7 8 9 RFI = 22Ω Figure 16. AppleTalk Direct Connect Using LTC1320 for DTE and LTC1335 for DCE Transceivers U 1k 1k RFI RFI OE RFI 1 2 3 4 24 23 22 21 20 19 LTC1335 18 17 16 15 14 13 –5V RA1 DE1 DY1 5V 5V 5V RFI SEL1, 5V SEL2, 5V 5 6 7 8 9 10 11 12 1321/22/35 F15 W U UO OE 1 2 3 4 24 23 22 21 20 19 LTC1335 18 17 16 15 14 13 5V RA1 DE1 DY1 5V 5V DY2 DZ2 RA2 5 6 7 8 9 10 11 12 –5V 1321/22/35 F16 15 LTC1321/LTC1322/LTC1335 TYPICAL APPLICATI A typical EIA562/RS232 interface application is shown in Figure 17 with LTC1322. A typical EIA562 interface application with LTC1335 is shown in Figure 18. A typical connection for RS485 transceiver is shown in Figure 19. A twisted pair of wires connects up to 32 drivers 1/2 LTC1322 DR IN DR IN RX OUT RX OUT OV 17 16 15 14 7 8 9 11 EIA562/ RS232 LINES 10 INTERFACE Figure 17. Typical Connection for EIA562/RS232 Interface 1/2 LTC1322/LTC1335 RX OUT DR ENABLE DR IN 5V 22 21 20 6 4 5 54 32 2 3 120Ω 120Ω 16 UO 3 2 5 4 S and receivers for half duplex multi-point data transmission. The wires must be terminated at both ends with resistors equal to the wire’s characteristic impedance, generally 120Ω. An optional shield around the twisted pair helps to reduce unwanted noise and should be connected to ground at one end. 1/2 LTC1322 22 23 20 21 6 RX OUT RX OUT DR IN DR IN 0V 1321/22/35 F17 1/2 LTC1335 DR IN DR IN RX OUT RX OUT OV 17 16 15 14 7 1 OE = 0V 8 9 10 11 EIA562 INTERFACE LINES 1/2 LTC1335 3 2 5 4 22 23 20 21 6 1 OE = 0V RX OUT RX OUT DR IN DR IN 0V 1321/22/35 F18 Figure 18. Typical Connection for EIA562 Interface 1/2 LTC1322/LTC1335 11 10 9 8 15 16 17 7 1/2 LTC1322/LTC1335 20 21 DR IN 22 6 1321/22/35 F19 RX OUT DR ENABLE DR IN 5V RX OUT 5V DR ENABLE Figure 19. Typical Connection for RS485 Interface LTC1321/LTC1322/LTC1335 TYPICAL APPLICATI A typical RS422 connection shown in Figure 20 allows one driver and ten receivers on a twisted pair of wires terminated with a 100Ω resistor at one end. The ground shield is optional. 1/2 LTC1322/LTC1335 DR ENABLE DR IN 5V RX OUT 20 6 21 4 5 32 22 RX IN UO S A typical twisted pair line repeater is shown in Figure 21. As data transmission rate drops with increased cable length, repeater can be inserted to improve transmission rate or to transmit beyond 4000 feet limit. 1/2 LTC1322/LTC1335 RX OUT 22 6 5V 1/2 LTC1322/LTC1335 100Ω 11 10 15 RX OUT 7 5V 16 2 3 100Ω 9 8 1321/22/35 F20 DR ENABLE DR IN 17 Figure 20. Typical Connection for RS422 Interface 5V 22 100Ω 2 3 20 21 6 4 TX OUT 5 1/2 LTC1322/LTC1335 1321/22/35 F21 Figure 21. Typical Cable Repeater for RS422 Interface 17 LTC1321/LTC1322/LTC1335 TYPICAL APPLICATI The LTC1322/LTC1335 can be used to translate EIA562 to RS422 interface level or vice versa as shown in Figure 22. One port is configured as EIA562 transceiver and the other as RS485 transceiver. The LTC1322 can also support RS232 to RS422 level translation if VDD is between 6.5V and 10V, and VEE is between – 6.5V and – 10V. EIA562/RS232* TX OUT 8 RX IN EIA562/RS232* TX OUT 10 LTC1322/LTC1335 8 2 3 7 17 22 * RS232 LEVELS ARE SUPPORTED ON LTC1322. 100Ω 4 5 Figure 23. Typical Cable Extension for EIA562/RS232 Interface 18 UO 15 20 S Using two LTC1321/LTC1335 as level translators, the EIA562/RS232 interface distance can be extended to 4000 feet with twisted wires (Figure 23). 5V 15 20 RX IN 10 21 6 4 TX OUT 5 LTC1322/LTC1335 2 3 7 17 22 1321/22/35 F22 RS422 100Ω RX IN * RS232 LEVELS ARE SUPPORTED ON LTC1322. Figure 22. Typical EIA562/RS232 to RS422 Level Translator 5V 21 6 4 5 RS422 100Ω 2 3 LTC1322/LTC1335 10 6 21 20 15 7 1321/22/35 F23 22 17 8 TX OUT EIA562/RS232* RX IN 5V LTC1321/LTC1322/LTC1335 PACKAGE DESCRIPTIO 0.260 ± 0.010 (6.604 ± 0.254) 0.300 – 0.325 (7.620 – 8.255) 0.015 (0.381) MIN 0.009 – 0.015 (0.229 – 0.381) ( +0.025 0.325 –0.015 +0.635 8.255 –0.381 ) 0.125 (3.175) MIN NOTE 1 NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS. 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 1 0.291 – 0.299 (7.391 – 7.595) (NOTE 2) 0.010 – 0.029 × 45° (0.254 – 0.737) 2 3 4 5 6 7 8 9 10 11 12 0.005 (0.127) RAD MIN 0.009 – 0.013 (0.229 – 0.330) NOTE 1 0.016 – 0.050 (0.406 – 1.270) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U Dimensions in inches (millimeters) unless otherwise noted. N Package 24-Lead Plastic DIP 1.265 (32.131) 24 23 22 21 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 9 10 11 12 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) 0.065 (1.651) TYP 0.050 – 0.085 (1.27 – 2.159) 0.100 ± 0.010 (2.540 ± 0.254) 0.018 ± 0.003 (0.457 ± 0.076) N24 0592 S Package 24-Lead Plastic SOL 0.598 – 0.614 (15.190 – 15.600) (NOTE 2) 20 19 18 17 16 24 23 22 21 15 14 13 0.394 – 0.419 (10.007 – 10.643) 0.093 – 0.104 (2.362 – 2.642) 0.037 – 0.045 (0.940 – 1.143) 0° – 8° TYP 0.050 (1.270) TYP 0.004 – 0.012 (0.102 – 0.305) 0.014 – 0.019 (0.356 – 0.482) SOL24 0392 19 LTC1321/LTC1322/LTC1335 U.S. Area Sales Offices NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 NORTHWEST REGION Linear Technology Corporation 782 Sycamore Dr. Milpitas, CA 95035 Phone: (408) 428-2050 FAX: (408) 432-6331 International Sales Offices FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" 58 Chemin de la Justice 92290 Chatenay Malabry France Phone: 33-1-41079555 FAX: 33-1-46314613 GERMANY Linear Techonolgy GmbH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 JAPAN Linear Technology KK 5F YZ Bldg. 4-4-12 Iidabashi, Chiyoda-Ku Tokyo, 102 Japan Phone: 81-3-3237-7891 FAX: 81-3-3237-8010 KOREA Linear Technology Korea Branch Namsong Building, #505 Itaewon-Dong 260-199 Yongsan-Ku, Seoul Korea Phone: 82-2-792-1617 FAX: 82-2-792-1619 SINGAPORE Linear Technology Pte. Ltd. 101 Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 TAIWAN Linear Technology Corporation Rm. 801, No. 46, Sec. 2 Chung Shan N. Rd. Taipei, Taiwan, R.O.C. Phone: 886-2-521-7575 FAX: 886-2-562-2285 UNITED KINGDOM Linear Technology (UK) Ltd. The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851 World Headquarters Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7487 Phone: (408) 432-1900 FAX: (408) 434-0507 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 LT/GP 0594 10K • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1994