LTC1321/LTC1322/LTC1335 RS232/EIA562/RS485 Transceivers U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 U APPLICATIONS ■ ■ Low Power RS485/RS422/EIA562/RS232 Interface Cable Repeater Level Translator 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. UO ■ 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. 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 2 3 RS485 INTERFACE 21 120Ω 20 19 18 LTC1322 16 120Ω 4 9 5 8 6 7 17 8 16 9 4000-FT 24-GAUGE TWISTED PAIR 5V 5V 0V 0V EIA562 INTERFACE 24 1 15 11 10 17 7 6 19 LTC1322 18 3 22 2 23 15 10 5 20 14 11 4 21 13 12 12 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 1 LTC1321/LTC1322/LTC1335 W W W AXI U U ABSOLUTE 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) W U U 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 TOP VIEW TOP VIEW VDD 1 24 VCC VDD 1 24 VCC OE 1 B1 2 23 NC B1 2 23 RB1 B1 2 24 VCC 23 RB1 A1 3 22 RA1 A1 3 22 RA1 A1 3 22 RA1 Z1 4 21 DE1 Z1 4 21 DZ1/DE1 Z1 4 21 DZ1/DE1 Y1 5 20 DY1 Y1 5 20 DY1 Y1 5 20 DY1 SEL1 6 19 LB SEL1 6 19 LB SEL1 6 19 LB SEL2 7 18 ON/OFF SEL2 7 18 ON/OFF SEL2 7 18 ON/OFF Y2 8 17 DY2 Y2 8 17 DY2 Y2 8 17 DY2 Z2 9 16 DE2 Z2 9 16 DZ2 /DE2 Z2 9 16 DZ2 /DE2 A2 10 15 RA2 A2 10 15 RA2 A2 10 15 RA2 B2 11 14 NC B2 11 14 RB2 B2 11 14 RB2 GND 12 13 VEE GND 12 13 VEE GND 12 13 VEE N PACKAGE 24-LEAD PLASTIC DIP S PACKAGE 24-LEAD PLASTIC SOL N PACKAGE 24-LEAD PLASTIC DIP S PACKAGE 24-LEAD PLASTIC SOL N PACKAGE 24-LEAD PLASTIC DIP S PACKAGE 24-LEAD PLASTIC SOL 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) TJMAX = 125°C, θJA = 75°C/W (N) TJMAX = 125°C, θJA = 85°C/W (S) ORDER PART NUMBER ORDER PART NUMBER ORDER PART NUMBER LTC1321CN LTC1321CS LTC1321IN LTC1321IS LTC1322CN LTC1322CS LTC1322IN LTC1322IS LTC1335CN LTC1335CS LTC1335IN LTC1335IS Consult factory for Military grade parts. 2 2 RS485 DRIVERS/RECEIVERS 4 EIA/TIA-562 DRIVERS/RECEIVERS LTC1321/LTC1322/LTC1335 DC ELECTRICAL CHARACTERISTICS VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = – 5V ±5% (Notes 2, 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RS485 Driver (SEL1 = SEL2 = HIGH) VOD1 Differential Driver Output Voltage (Unloaded) IO = 0 ● VOD2 Differential Driver Output Voltage (With Load) Figure 1, R = 50Ω (RS422) Figure 1, R = 27Ω (RS485) ● ● 5 V 5 5 V V ∆VOD Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Figure 1, R = 27Ω or R = 50Ω ● 0.2 V VOC Driver Common-Mode Output Voltage Figure 1, R = 27Ω or R = 50Ω ∆VOC Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States Figure 1, R = 27Ω or R = 50Ω ● 3 V ● 0.2 V IOSD Driver Short-Circuit Current – 7V ≤ VO ≤ 12V, VO = HIGH – 7V ≤ VO ≤ 12V, VO = LOW (Note 4) ● ● 250 250 mA mA IOZD Three-State Output Current (Y, Z) – 7V ≤ VO ≤ 12V ● ±500 µA 2.0 1.5 35 10 ±5 EIA/TIA-562 Driver (SEL1 = SEL2 = LOW) VO Output Voltage Swing Figure 4, RL = 3k, Positve Figure 4, RL = 3k, Negative ● ● IOSD Output Short-Circuit Current VO = 0V ● 3.7 – 3.7 4.2 – 4.3 ±11 V V ±60 mA Driver Inputs and Control Inputs VIH Input High Voltage D, DE, ON/OFF, SEL1, SEL2, LB OE (LTC1335) ● ● VIL Input Low Voltage D, DE, ON/OFF, SEL1, SEL2, LB OE (LTC1335) ● ● IIN Input Current D, SEL1, SEL2 DE, ON/OFF, LB OE (LTC1335) ● ● ● 2 2 V V –4 4 0.8 0.8 V V ±10 – 15 15 µA µA µA 0.2 0.3 V V RS485 Receiver (SEL1 = SEL2 = HIGH) VTH Differential Input Threshold Voltage – 7V ≤ VCM ≤ 7V, Commercial – 7V ≤ VCM ≤ 7V, Industrial ● ● ∆VTH Input Hysteresis VCM = 0V ● IIN Input Current (A, B) – 7V ≤ VIN ≤ 12V ● RIN Input Resistance – 7V ≤ VIN ≤ 12V ● 12 24 Input Low Threshold Input High Threshold ● ● 0.8 1.1 1.7 2.4 V V ● 0.1 0.6 1.0 V 3 5 7 3.5 4.6 – 0.2 – 0.3 70 mV ±1 mA kΩ EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW) VTH Receiver Input Voltage Threshold ∆VTH Receiver Input Hysteresis RIN Receiver Input Resistance VIN = ±10V kΩ Receiver Output VOH Receiver Output High Voltage IO = – 3mA, VIN = 0V, SEL1 = SEL2 = LOW ● VOL Receiver Output Low Voltage IO = 3mA, VIN = 3V, SEL1 = SEL2 = LOW ● IOSR Short-Circuit Current 0V ≤ VO ≤ VCC ● IOZR Three-State Output Current ON/OFF = 0V OE = VCC (LTC1335) ● ● 0.2 7 V 0.4 V 85 mA ±10 ±10 µA µA 3 LTC1321/LTC1322/LTC1335 DC ELECTRICAL CHARACTERISTICS VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = – 5V ±5% (Notes 2, 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supply Currents ICC VCC Supply Current No Load (SEL1 = SEL2 = HIGH) Shutdown, ON/OFF = 0V ● ● 1000 15 2000 50 µA µA IDD VDD Supply Current (LTC1321/LTC1322) No Load (SEL1 = SEL2 = LOW) Shutdown, ON/OFF = 0V ● ● 300 0.1 1000 50 µA µA IEE VEE Supply Current No Load (SEL1 = SEL2 = HIGH) Shutdown, ON/OFF = 0V ● ● – 1000 – 0.1 – 2000 – 50 µA µA MIN TYP MAX AC DC ELECTRICAL CHARACTERISTICS VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = – 5V ±5% (Notes 2, 3) SYMBOL PARAMETER CONDITIONS UNITS EIA/TIA-562 Mode (SEL1 = SEL2 = LOW) SR Slew Rate Figure 4, RL = 3k, CL = 15pF Figure 4, RL = 3k, CL = 1000pF ● ● 14 7 30 4 V/µs V/µs 0.22 1.9 3.1 µs tT Transition Time Figure 4, RL = 3k, CL = 2500pF ● t PLH Driver Input to Output Figures 4,10, RL = 3k, CL = 15pF ● 0.6 4 µs t PHL Driver Input to Output Figures 4,10, RL = 3k, CL = 15pF ● 0.6 4 µs t PLH Receiver Input to Output Figures 5,11 ● 0.3 6 µs t PHL Receiver Input to Output Figures 5,11 ● 0.4 6 µs RS485 Mode (SEL1 = SEL2 = HIGH) t PLH Driver Input to Output Figures 2,7, RL = 54Ω, CL = 100pF ● 20 40 70 ns t PHL Driver Input to Output Figures 2,7, RL = 54Ω, CL = 100pF ● 20 40 70 ns t SKEW Driver Output to Output Figures 2,7, RL = 54Ω, CL = 100pF ● 5 15 ns t r, tf Driver Rise or Fall Time Figures 2,7, RL = 54Ω, CL = 100pF ● 3 15 40 ns t ZL Driver Enable to Output Low Figures 3,8, CL = 100pF, S1 Closed ● 50 90 ns t ZH Driver Enable to Output High Figures 3,8, CL = 100pF, S2 Closed ● 50 90 ns tLZ Driver Disable from Low Figures 3,8, CL = 15pF, S1 Closed ● 50 90 ns tHZ Driver Disable from High Figures 3,8, CL = 15pF, S2 Closed ● 60 90 ns t PLH Receiver Input to Output Figures 2,9, RL = 54Ω, CL = 100pF ● 20 60 140 ns t PHL Receiver Input to Output Figures 2,9, RL = 54Ω, CL = 100pF ● 20 70 140 ns tSKEW Differential Receiver Skew, tPLH-tPHL Figures 2,9, RL = 54Ω, CL = 100pF ● 10 ns Receiver Output Enable/Disable (LTC1335) tZL Receiver Enable to Output Low Figures 6,12, CL = 15pF, S1 Closed ● 40 90 ns tZH Receiver Enable to Output High Figures 6,12, CL = 15pF, S2 Closed ● 40 90 ns tLZ Receiver Disable from Low Figures 6,12, CL = 15pF, S1 Closed ● 40 90 ns tHZ Receiver Disable from High Figures 6,12, CL = 15pF, S2 Closed ● 50 90 ns The ● 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. 4 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. LTC1321/LTC1322/LTC1335 U W TYPICAL PERFORMANCE CHARACTERISTICS RS485 Driver Differential Output Voltage vs Temperature RS485 Driver Differential Output Current vs Output Voltage 15 70 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 TA = 25°C 60 12 50 TIME (µs) RL = 54Ω 2.5 DIFFERENTIAL OUTPUT CURRENT (mA) 40 30 50 25 0 75 TEMPERATURE (°C) 100 3 125 0 1 2 160 TA = 25°C 100 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT SHORT-CIRCUIT CURRENT (mA) TA = 25°C –70 –50 –40 –30 –20 80 60 40 20 –10 0 1 0 2 3 OUTPUT VOLTAGE (V) 4 5 0 1 2 3 4 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 6 RL = 3k –1 –2 –3 –4 –5 –50 –25 80 OUTPUT LOW OUTPUT HIGH 2 0 –2 –4 OUTPUT LOW –8 100 125 1321 G07 SOURCE (VOUT = 0V) 60 50 25 75 0 TEMPERATURE (°C) –10 100 125 1321 G19 EIA562 Driver Output Short-Circuit Current vs Temperature 4 –6 50 25 0 75 TEMPERATURE (°C) 100 18 RL = 3k TA = 25°C VEE = –VDD 8 OUTPUT HIGH 2 SINK (VOUT = 5V) 40 –50 –25 5 10 3 0 120 EIA562 Driver Output Voltage vs Supply Voltage 5 4 140 1321 G05 1321 G04 EIA562 Driver Output Voltage vs Temperature 125 RS485 Driver Output Short-Circuit Current vs Temperature 120 –80 100 1321 G03 RS485 Driver Output Low Voltage vs Output Current –60 50 25 0 75 TEMPERATURE (°C) 1321 G02 RS485 Driver Output High Voltage vs Output Current 1 0 –50 –25 5 3 4 DIFFERENTIAL OUTPUT VOLTAGE (V) 1321 G01 0 6 10 0 1.6 –50 –25 9 20 OUTPUT SHORT-CIRCUIT CURRENT (mA) DIFFERENTIAL OUTPUT VOLTAGE (V) 2.6 RS485 Driver Skew vs Temperature 4 5 7 8 9 6 VDD SUPPLY VOLTAGE (V) 10 1321 G08 VOUT = 0V 16 14 SOURCE 12 10 SINK 8 6 –50 –25 50 25 75 0 TEMPERATURE (°C) 100 125 1321 G09 5 LTC1321/LTC1322/LTC1335 U W TYPICAL PERFORMANCE CHARACTERISTICS 5.0 0.5 20 IOUT = 3mA IOUT = 3mA 4.9 18 0.4 4.7 4.6 4.5 4.4 4.3 16 14 0.3 TIME (ns) OUTPUT VOLTAGE (V) 4.8 OUTPUT VOLTAGE (V) RS485 Receiver tPLH – tPHL vs Temperature Receiver Output Low Voltage vs Temperature Receiver Output High Voltage vs Temperature 0.2 2 4.0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 0 –50 –25 125 50 25 0 75 TEMPERATURE (°C) 100 1321 G10 12 10 8 6 INPUT THRESHOLD VOLTAGE (V) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 2.0 35 14 30 25 20 15 10 4 5 2 0 3.5 4.0 3.0 OUTPUT VOLTAGE (V) 4.5 5.0 0 0.5 1.0 1.5 2.0 OUTPUT VOLTAGE (V) Driver Output Leakage Current (Disable/Shutdown) vs Temperature ICC ±350 SUPPLY CURRENT (mA) ±150 ±100 INPUT LOW 1.0 50 25 75 0 TEMPERATURE (°C) 0.8 100 125 1321 G15 Supply Current in EIA562 Mode vs Temperature (Both Ports) RL = ∞ 450 RL = ∞ 400 –IEE 0.6 0.4 –IEE 350 300 250 –IDD ICC 200 150 100 0.2 ±50 1.2 0.8 –50 –25 3.0 1.0 ±200 1.4 500 1.2 ±250 INPUT HIGH 1.6 Supply Current in RS485 Mode vs Temperature (Both Ports) ±400 ±300 1.8 1321 G14 1321 G13 0 –50 –25 2.5 SUPPLY CURRENT (µA) 2.5 125 TA = 25°C 16 2.0 100 EIA562 Receiver Input Threshold Voltage vs Temperature 40 TA = 25°C 18 50 25 0 75 TEMPERATURE (°C) 1321 G12 Receiver Output Current vs Output Low Voltage 120 OUTPUT LEAKAGE CURRENT (µA) 0 –50 –25 125 1321 G11 Receiver Output Current vs Output High Voltage 50 0 25 50 75 100 125 TEMPERATURE (°C) 1321 G06 6 8 4 4.1 0 10 6 0.1 4.2 12 0 –50 –25 –IDD 50 25 75 0 TEMPERATURE (°C) 100 125 1321 G17 0 –50 –25 50 25 0 75 TEMPERATURE (°C) 100 125 1321 G18 LTC1321/LTC1322/LTC1335 U U U PI FU CTIO S LTC1321 LTC1322/LTC1335 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. 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. 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. 7 LTC1321/LTC1322/LTC1335 U U FU CTIO TABLES LTC1321 LTC1322 RS485 Driver Mode RS485 Driver Mode ON/OFF INPUTS SEL DE D LINE CONDITION OUTPUTS Y Z ON/OFF INPUTS SEL DE D LINE CONDITION OUTPUTS Y Z 1 1 1 0 No Fault 0 1 1 1 1 0 No Fault 0 1 1 1 1 1 No Fault 1 0 1 1 1 1 No Fault 1 0 1 1 1 X Fault Z Z 1 1 1 X Fault Z Z 1 1 0 X X Z Z 1 1 0 X X Z Z 0 1 X X X Z Z 0 1 X X X Z Z RS485 Receiver Mode RS485 Receiver Mode ON/OFF INPUTS SEL A–B OUTPUT R ON/OFF INPUTS SEL A–B OUTPUT R 1 1 < – 0.2V 0 1 1 < – 0.2V 0 1 1 > 0.2V 1 1 1 > 0.2V 1 1 1 Inputs Open 1 1 1 Inputs Open 1 0 1 X Z 0 1 X Z RS232/EIA562 Driver Mode RS232/EIA562 Driver Mode ON/OFF INPUTS SEL D LINE CONDITION OUTPUT Y ON/OFF INPUTS SEL D LINE CONDITION OUTPUT Y, Z 1 0 0 No Fault 1 1 0 0 No Fault 1 1 0 1 No Fault 0 1 0 1 No Fault 0 1 0 X Fault Z 1 0 X Fault Z 0 0 X X Z 0 0 X X Z RS232/EIA562 Receiver Mode RS232/EIA562 Receiver Mode ON/OFF INPUTS SEL A OUTPUT R ON/OFF INPUTS SEL A OR B OUTPUT R 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 Inputs Open 1 1 0 Input Open 1 0 0 X Z 0 0 X Z 8 LTC1321/LTC1322/LTC1335 U U FU CTIO TABLES LTC1335 EIA562 Driver Mode RS485 Driver Mode ON/OFF INPUTS SEL DE D LINE CONDITION OUTPUTS Y Z ON/OFF INPUTS SEL D LINE CONDITION OUTPUT Y, Z 1 1 1 0 No Fault 0 1 1 0 0 No Fault 1 1 1 1 1 No Fault 1 0 1 0 1 No Fault 0 1 1 1 X Fault Z Z 1 0 X Fault Z 1 1 0 X X Z Z 0 0 X X Z 0 1 X X X Z Z RS485 Receiver Mode EIA562 Receiver Mode INPUTS INPUTS ON/OFF SEL OE A–B OUTPUT R ON/OFF SEL OE A OR B OUTPUT R 1 1 0 < – 0.2V 0 1 0 0 0 1 1 1 0 > 0.2V 1 1 0 0 1 0 1 1 0 Inputs Open 1 1 0 0 Input Open 1 1 1 1 X Z 1 0 1 X Z 0 1 X X Z 0 0 X X Z W BLOCK DIAGRA SM LTC1321 Interface Configuration Without Loopback VDD A1 Y1 SEL1 PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 1 24 3 5 6 22 20 19 VCC VDD RA1 B1 A1 DY1 LB Z1 Y1 *SEL1 SEL2 Y2 A2 GND 7 8 10 12 18 17 15 13 ON DY2 SEL2 Y2 RA2 A2 VEE GND PORT 1 = RS485 MODE PORT 2 = EIA562 MODE 1 24 2 3 4 5 6 22 21 20 19 VCC RA1 DE1 DY1 8 10 12 17 15 13 A1 Y1 SEL1 LB *SEL2 ON Y2 Z2 7 18 VDD DY2 A2 RA2 VEE B2 GND PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 1 24 3 5 6 7 8 9 22 20 19 18 17 1 16 10 11 12 15 13 RA1 VDD B1 A1 DY1 Z1 VCC LB Y1 *SEL1 ON DY2 *SEL2 Y2 Z2 DE2 RA2 A2 B2 VEE GND PORT 1 = RS485 MODE PORT 2 = RS485 MODE 24 1 2 22 3 4 5 21 20 6 19 7 18 8 9 17 10 11 12 16 15 13 VCC RA1 DE1 DY1 LB ON DY2 DE2 RA2 VEE 1321BD01 * SEL1/SEL2 = VCC 9 LTC1321/LTC1322/LTC1335 W BLOCK DIAGRA SM LTC1321 Interface Configuration With Loopback VDD Y1 SEL1 PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 1 24 22 5 6 20 19 VCC VDD RA1 Z1 Y2 7 8 18 17 15 GND 12 13 22 4 21 DY1 LB Y1 *SEL1 SEL2 PORT 1 = RS485 MODE PORT 2 = EIA562 MODE 1 24 ON DY2 SEL2 Y2 20 6 19 7 18 8 17 15 RA2 VEE 5 GND 12 13 VCC VDD PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 1 24 22 RA1 DE1 DY1 LB ON Y1 SEL1 *SEL2 Y2 20 6 19 7 8 18 17 16 DY2 Z2 RA2 VEE 5 GND 9 12 15 13 VCC RA1 VDD Z1 PORT 1 = RS485 MODE PORT 2 = RS485 MODE 1 24 4 21 DY1 LB Y1 *SEL1 ON DY2 22 *SEL2 Y2 5 20 6 19 7 8 DE2 RA2 Z2 VEE GND 9 12 18 17 16 15 13 VCC RA1 DE1 DY1 LB ON DY2 DE2 RA2 VEE 1321 BD02 *SEL1/SEL2 = VCC LTC1322/LTC1335 Interface Configuration Without Loopback *VDD /OE PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 24 1 * PORT 1 = RS485 MODE PORT 2 = EIA562 MODE VCC *VDD /OE B1 B1 A1 Z1 Y1 SEL1 SEL2 Y2 Z2 A2 B2 GND 2 23 3 22 4 21 5 20 6 19 7 8 9 16 10 15 11 12 14 13 * RB1 RA1 A1 DY1 LB Z1 Y1 **SEL1 ON DY2 Y2 DZ2 Z2 RA2 RB2 VEE 3 24 23 22 21 DZ1 SEL2 18 17 1 2 A2 B2 GND 4 5 6 7 20 19 VCC *VDD /OE 18 17 9 16 10 15 11 12 14 13 VCC *VDD /OE B1 RB1 B1 RA1 DE1 DY1 A1 Z1 Y1 SEL1 LB **SEL2 8 PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 24 1 * ON DY2 DZ2 RA2 Y2 Z2 A2 B2 RB2 VEE GND 2 23 3 22 4 21 5 20 6 19 7 8 18 17 9 16 10 11 12 15 14 13 PORT 1 = RS485 MODE PORT 2 = RS485 MODE 24 1 * 2 RB1 RA1 A1 DZ1 Z1 DY1 LB ON DY2 Y1 **SEL1 **SEL2 Y2 Z2 3 4 5 6 7 8 RA2 RB2 VEE B2 GND 22 21 20 19 18 17 9 16 DE2 A2 23 10 11 12 15 14 13 VCC RB1 RA1 DE1 DY1 LB ON DY2 DE2 RA2 RB2 VEE 1322/35 BD01 * 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 LTC1321/LTC1322/LTC1335 W BLOCK DIAGRA SM LTC1322/LTC1335 Interface Configuration With Loopback PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE 24 1 * *VDD /OE PORT 1 = RS485 MODE PORT 2 = EIA562 MODE VCC 1 *VDD /OE 24 * 23 23 22 Z1 Y1 SEL1 4 21 5 6 20 19 7 SEL2 18 17 9 16 Y2 Z2 15 GND Z1 21 LB 14 13 12 ON DY2 Y2 DZ2 Z2 20 5 6 Y1 **SEL1 19 7 SEL2 8 22 4 DZ1 DY1 8 18 17 9 16 15 RA2 RB2 VEE *VDD /OE GND 14 13 12 VCC *VDD /OE PORT 1 = RS485 MODE PORT 2 = RS485 MODE 24 1 * 23 RB1 23 RB1 RA1 VCC PORT 1 = EIA562 MODE PORT 2 = RS485 MODE 24 1 * RA1 22 DE1 Z1 Y1 SEL1 DY1 4 21 5 6 20 19 LB 18 8 Y2 17 16 DZ2 9 Z2 RA2 RB2 VEE RA1 Z1 15 14 13 12 GND 22 4 21 DZ1 DY1 LB Y1 **SEL1 7 **SEL2 ON DY2 RB1 ON DY2 **SEL2 Y2 5 20 6 19 7 18 8 17 16 DE2 RA2 RB2 VEE Z2 GND 9 15 14 13 12 VCC RB1 RA1 DE1 DY1 LB ON DY2 DE2 RA2 RB2 VEE 1322/35 BD02 * 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 R D VOD SEL Y R A SEL R CL B OE RL Z DE VOC S1 CL 500Ω DR OUT 15pF CL S2 0V 3V Z 1321/22/35 F03 1321/22/35 F02 1321/22/35 F01 Figure 1. RS485 Driver Test Load Figure 2. RS485 Driver/Receiver Timing Test Circuit Figure 3. RS485 Driver Output Enable/Disable Timing Test Load VCC 0V D 0V 0V SEL Y OR Z D CL SEL Y OR Z S1 SEL A OR B 1k R RL RX OUT OE 15pF 0V 1321/22/35 F04 Figure 4. EIA/TIA-562 Driver Timing Test Circuit CL S2 1321/22/35 F05 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 U W SWITCHI G WAVEFOR S 3V f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V D 1.5V 0V tPLH tPHL VO 90% Y–Z VDIFF = V(Y) – V(Z) 50% 10% –VO 90% 50% 10% 1/2 VO tr tf Z VO Y tSKEW tSKEW 1321/22/35 F07 Figure 7. RS485 Driver Propagation Delays 3V 1.5V DE f = 1MHz: tr ≤ 10ns: tf ≤ 10ns 1.5V 0V tZL tLZ 5V Y OR Z 2.3V OUTPUT NORMALLY LOW VOL tZH OUTPUT NORMALLY HIGH VOH 0.5V tHZ 0.5V 2.3V Y OR Z 0V 1321/22/35 F08 Figure 8. RS485 Driver Enable and Disable Times V OD2 0V A–B f = 1MHz: tr ≤ 10ns: tf ≤ 10ns INPUT 0V –V OD2 tPLH OUTPUT VOH R tPHL 1.5V 1.5V VOL 1321/22/35 F09 Figure 9. RS485 Receiver Propagation Delays 3V 1.5V 1.5V D 0V tPHL tPLH VO Y OR Z 0V 0V –VO Figure 10. EIA/TIA-562 Driver Propagation Delays 12 1321/22/35 F10 LTC1321/LTC1322/LTC1335 U W SWITCHI G WAVEFOR S V IH 1.7V 1.3V A OR B VIL tPHL tPLH VOH 2.4V R 1321/22/35 F11 0.8V VOL Figure 11. EIA/TIA-562 Receiver Propagation Delays 3V 1.5V OE 0V f = 1MHz: tr ≤ 10ns: tf ≤ 10ns tZL 1.5V tLZ 5V R 1.5V OUTPUT NORMALLY LOW VOL tZH OUTPUT NORMALLY HIGH VOH 0.5V tHZ 0.5V 1.5V R 0V 1321/22/35 F12 Figure 12. Receiver Enable and Disable Times U W U UO 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. 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 U W U UO 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. LTC1321/LTC1322 ONLY VCC 5V 24 0.1µF RX OUT 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. 22 120Ω RS485 I/O 4 5 20 DR IN 19 5V LTC1321 LTC1322 LTC1335 18 5V 17 DR IN DR IN RX OUT RX OUT VEE –5V VDD (LTC1321/LTC1322) OR OE (LTC1335) 21 DR ENABLE EIA562/RS485 Applications 1 2 3 6 7 8 16 9 15 10 14 11 13 12 5V 0V EIA562 DR OUT EIA562 DR OUT (LTC1322/LTC1335 ONLY) EIA562 RX IN EIA562 RX IN (LTC1322/LTC1335 ONLY) 0.1µF 1321/22/35 F13 Figure 13. EIA562/RS485 Interfaces with ±5V Supplies 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. V+ 12V VCC 5V DR ENABLE DR IN Z3* 1N5246B 16V LocalTalk and AppleTalk are registered trademarks of Apple Computer, Inc. 14 5V 5V DR IN DR IN RX OUT 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. 1 VDD 2 3 24 0.1µF RX OUT VEE – V –12V RX OUT Z2 1N5229B 4.3V Z1 1N5229B 4.3V 22 0.1µF 21 19 18 120Ω RS485 I/O 4 5 20 6 LTC1321 LTC1322 7 17 8 16 9 15 10 14 11 13 12 5V 0V RS232 DR OUT RS232 DR OUT (LTC1322 ONLY) RS232 RX IN RS232 RX IN (LTC1322 ONLY) 0.1µF 1321/22/35 F14 *OPTIONAL Figure 14. RS232/RS485 Interfaces with 5V, ±12V Supplies LTC1321/LTC1322/LTC1335 W U U UO APPLICATI S I FOR ATIO 1k OE RFI TXD TXI TXDEN RXEN RXO RXO RXDO 1k 18 1 5V 17 TXD – 2 RFI RFI 4 5 14 RFI 1k 5V 6 13 7 12 8 – 11 RXD + RFI 10 RXD RFI 9 LTC1320 24 2 23 22 3 21 4 120Ω 120Ω 16 TXD + 15 3 RFI 1 RFI SEL1, 5V 1k 22Ω 22Ω SEL2, 5V RFI = 20 5 6 7 19 LTC1335 18 8 17 9 16 100pF 10 5V RA1 DE1 DY1 5V 5V 15 11 14 12 13 –5V 1321/22/35 F15 Figure 15. Apple LocalTalk Implemented Using LTC1320 and LTC1335 Transceivers TXD TXI 18 5V 17 TXD – 1 2 3 16 TXD + TXDEN RXEN RXO RXO RXDO 4 15 TXO 5 14 6 7 12 RXI 8 11 RXD – LTC1320 120Ω 120Ω RFI RFI RFI RFI RFI – 5V 13 RXI 9 OE RFI 1 24 2 23 3 22 4 21 120Ω RFI 10 RXD + RFI RFI SEL1, 5V SEL2 RFI 20 5 19 6 7 LTC1335 18 120Ω RFI 22Ω RFI 22Ω RFI = RFI RFI 100pF 8 17 9 16 10 15 11 14 12 13 5V RA1 DE1 DY1 5V 5V DY2 DZ2 RA2 –5V 1321/22/35 F16 Figure 16. AppleTalk Direct Connect Using LTC1320 for DTE and LTC1335 for DCE Transceivers 15 LTC1321/LTC1322/LTC1335 UO TYPICAL APPLICATI 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. 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 1/2 LTC1335 1/2 LTC1322 17 8 EIA562/ 3 22 16 9 RS232 2 23 15 10 INTERFACE 5 20 14 11 4 21 LINES 7 6 RX OUT DR IN RX OUT DR IN DR IN RX OUT DR IN RX OUT OV 0V 1/2 LTC1335 17 8 EIA562 3 22 16 9 INTERFACE 2 23 15 10 LINES 5 20 14 11 4 21 7 6 1 1321/22/35 F17 1 OE = 0V DR ENABLE DR IN 5V 20 11 2 3 21 10 120Ω 120Ω 4 5 6 5 4 15 16 9 8 17 7 3 2 RX OUT DR ENABLE DR IN 5V 1/2 LTC1322/LTC1335 20 21 DR IN 22 6 RX OUT DR ENABLE 5V Figure 19. Typical Connection for RS485 Interface 16 DR IN DR IN 0V 1321/22/35 F18 OE = 0V 1/2 LTC1322/LTC1335 1/2 LTC1322/LTC1335 22 RX OUT Figure 18. Typical Connection for EIA562 Interface Figure 17. Typical Connection for EIA562/RS232 Interface RX OUT RX OUT 1321/22/35 F19 LTC1321/LTC1322/LTC1335 UO TYPICAL APPLICATI S 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. 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 1/2 LTC1322/LTC1335 DR ENABLE DR IN 5V RX OUT 1/2 LTC1322/LTC1335 3 2 21 20 5V 11 4 100Ω 5 10 2 9 15 RX OUT 7 5V 6 16 22 100Ω 3 17 DR ENABLE DR IN 8 1321/22/35 F20 Figure 20. Typical Connection for RS422 Interface 5V 22 RX IN 20 21 6 2 4 3 5 100Ω TX OUT 1/2 LTC1322/LTC1335 1321/22/35 F21 Figure 21. Typical Cable Repeater for RS422 Interface 17 LTC1321/LTC1322/LTC1335 UO TYPICAL APPLICATI S 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. 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 21 6 4 10 RX IN TX OUT 5 EIA562/RS232* RS422 LTC1322/LTC1335 2 8 TX OUT 100Ω RX IN 3 7 17 22 1321/22/35 F22 * RS232 LEVELS ARE SUPPORTED ON LTC1322. Figure 22. Typical EIA562/RS232 to RS422 Level Translator 5V 15 20 RX IN 22 17 RS422 21 6 2 4 10 EIA562/RS232* TX OUT 8 100Ω 5 LTC1322/LTC1335 EIA562/RS232* LTC1322/LTC1335 4 2 8 10 100Ω 3 7 TX OUT 3 6 17 22 RX IN 5 21 20 15 7 1321/22/35 F23 * RS232 LEVELS ARE SUPPORTED ON LTC1322. 5V Figure 23. Typical Cable Extension for EIA562/RS232 Interface 18 LTC1321/LTC1322/LTC1335 U PACKAGE DESCRIPTIO 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 0.260 ± 0.010 (6.604 ± 0.254) 0.300 – 0.325 (7.620 – 8.255) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.015 (0.381) MIN 0.009 – 0.015 (0.229 – 0.381) ( 0.125 (3.175) MIN +0.025 0.325 –0.015 +0.635 8.255 –0.381 0.065 (1.651) TYP ) 0.050 – 0.085 (1.27 – 2.159) 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) N24 0592 S Package 24-Lead Plastic SOL 24 23 22 21 0.598 – 0.614 (15.190 – 15.600) (NOTE 2) 20 19 18 17 16 15 14 13 0.394 – 0.419 (10.007 – 10.643) 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 0.005 (0.127) RAD MIN 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 0.093 – 0.104 (2.362 – 2.642) 12 0.037 – 0.045 (0.940 – 1.143) 0° – 8° TYP 0.009 – 0.013 (0.229 – 0.330) 0.050 (1.270) TYP NOTE 1 0.016 – 0.050 (0.406 – 1.270) 0.004 – 0.012 (0.102 – 0.305) 0.014 – 0.019 (0.356 – 0.482) SOL24 0392 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. 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 SOUTHEAST REGION Linear Technology Corporation 17060 Dallas Parkway Suite 208 Dallas, TX 75248 Phone: (214) 733-3071 FAX: (214) 380-5138 SOUTHWEST REGION Linear Technology Corporation 22141 Ventura Blvd. Suite 206 Woodland Hills, CA 91364 Phone: (818) 703-0835 FAX: (818) 703-0517 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 CENTRAL REGION Linear Technology Corporation Chesapeake Square 229 Mitchell Court, Suite A-25 Addison, IL 60101 Phone: (708) 620-6910 FAX: (708) 620-6977 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 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 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 GERMANY Linear Techonolgy GmbH Untere Hauptstr. 9 D-85386 Eching Germany Phone: 49-89-3197410 FAX: 49-89-3194821 SINGAPORE Linear Technology Pte. Ltd. 101 Boon Keng Road #02-15 Kallang Ind. Estates Singapore 1233 Phone: 65-293-5322 FAX: 65-292-0398 UNITED KINGDOM Linear Technology (UK) Ltd. The Coliseum, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Phone: 44-276-677676 FAX: 44-276-64851 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 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 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LT/GP 0594 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994