LTC1322 Linear Technology, LTC1322 Datasheet
LTC1322
Available stocks
Related parts for LTC1322
LTC1322 Summary of contents
Page 1
... Each can be configured as two RS485 differential ports, as two single-ended ports one RS485 differential port and one single-ended port. The LTC1321/LTC1322 can provide RS232 or EIA562 compat- ible 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 ...
Page 2
... Output Voltage Drivers ................................................. – 25V to 25V Receivers ............................... – 0. Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range + 0.3V) LTC1321C/LTC1322C/LTC1335C ......... LTC1321I/LTC1322I/LTC1335I ......... – Storage Temperature Range ................ – 150 C + 0.3V) Lead Temperature (Soldering, 10 sec)................ 300 RS485 DRIVERS/RECEIVERS 4 EIA/TIA-562 DRIVERS/RECEIVERS ...
Page 3
... DC ELECTRICAL CHARACTERISTICS (LTC1321/LTC1322 5 SYMBOL PARAMETER RS485 Driver (SEL1 = SEL2 = HIGH) V Differential Driver Output Voltage (Unloaded) OD1 V Differential Driver Output Voltage (With Load) OD2 V Change in Magnitude of Driver Differential OD Output Voltage for Complementary Output States V Driver Common-Mode Output Voltage OC V Change in Magnitude of Driver Common-Mode ...
Page 4
... V Supply Current Supply Current (LTC1321/LTC1322 Supply Current ELECTRICAL CHARACTERISTICS (LTC1321/LTC1322 5 SYMBOL PARAMETER EIA/TIA-562 Mode (SEL1 = SEL2 = LOW) SR Slew Rate t Transition Time T t Driver Input to Output PLH t Driver Input to Output PHL t Receiver Input to Output ...
Page 5
... –1 –2 –3 OUTPUT LOW –4 –5 –50 – 100 125 TEMPERATURE (°C) 1321 G07 LTC1321/LTC1322/LTC1335 RS485 Driver Differential Output Current vs Output Voltage 25° DIFFERENTIAL OUTPUT VOLTAGE (V) 1321 G02 ...
Page 6
... LTC1321/LTC1322/LTC1335 W U TYPICAL PERFORMANCE CHARACTERISTICS Receiver Output High Voltage vs Temperature 5 3mA OUT 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 –50 – 100 125 TEMPERATURE (°C) 1321 G10 Receiver Output Current vs Output High Voltage 120 T = 25° 2.0 2.5 3.5 4.0 4.5 5.0 3.0 OUTPUT VOLTAGE (V) 1321 G13 Driver Output Leakage Current (Disable/Shutdown) vs Temperature ± ...
Page 7
... CC LTC1321/LTC1322/LTC1335 LTC1322/LTC1335 OE/V (Pin 1): For LTC1335, pin 1 is the receiver DD 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. ...
Page 8
... No Fault Fault RS232/EIA562 Receiver Mode INPUTS ON/OFF SEL Inputs Open LTC1322 RS485 Driver Mode OUTPUTS Y Z ON/OFF RS485 Receiver Mode OUTPUT R ON/OFF ...
Page 9
... SEL1 *SEL2 GND EE LTC1321/LTC1322/LTC1335 INPUTS LINE SEL D CONDITION Fault Fault 0 X Fault INPUTS SEL Input Open ...
Page 10
... GND GND FOR LTC1322 ONLY, PIN AND OE IS ALWAYS ENABLED. DD FOR LTC1335, PIN 1 IS OE, AND V IS CONNECTED SEL1/SEL2 = LTC1321 Interface Configuration With Loopback PORT 1 = RS485 MODE PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE ...
Page 11
... GND GND EE * FOR LTC1322 ONLY, PIN AND OE IS ALWAYS ENABLED. DD FOR LTC1335, PIN 1 IS OE, AND V IS CONNECTED SEL1/SEL2 = TEST CIRCUITS 1321/22/35 F01 Figure 1. RS485 Driver Test Load ...
Page 12
... LTC1321/LTC1322/LTC1335 U SWITCHI G WAVEFOR – Z – OD2 A – B –V OD2 – 1MHz: t 10ns: t 10ns r f 1.5V t PLH 90 V(Y) – V(Z) DIFF 50% 10% 1 ...
Page 13
... 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 V and V supply levels ...
Page 14
... LTC1320 AppleTalk transceiver in a typical LocalTalk configuration. Figure 16 shows a typical direct-wire con- nection 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. ...
Page 15
... RFI 100pF Figure 15. Apple LocalTalk Implemented Using LTC1320 and LTC1335 Transceivers 120 120 22 100pF Figure 16. AppleTalk Direct Connect Using LTC1320 for DTE and LTC1335 for DCE Transceivers LTC1321/LTC1322/LTC1335 RFI 1k 3 RFI 4 RFI 5 RFI 6 SEL1 LTC1335 ...
Page 16
... LTC1321/LTC1322/LTC1335 TYPICAL PPLICATI A typical EIA562/RS232 interface application is shown in Figure 17 with LTC1322. A typical EIA562 interface appli- cation with LTC1335 is shown in Figure 18. A typical connection for RS485 transceiver is shown in Figure 19. A twisted pair of wires connects drivers 1/2 LTC1322 17 EIA562 RS232 ...
Page 17
... LTC1322/LTC1335 RX OUT 100 5 2 100 3 Figure 20. Typical Connection for RS422 Interface 100 3 1/2 LTC1322/LTC1335 Figure 21. Typical Cable Repeater for RS422 Interface LTC1321/LTC1322/LTC1335 1/2 LTC1322/LTC1335 OUT ENABLE 1321/22/35 F20 OUT 5 1321/22/35 F21 17 ...
Page 18
... LTC1321/LTC1322/LTC1335 O U TYPICAL A PPLICATI 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 V and 10V, and V is between – 6.5V and – 10V. ...
Page 19
... S Package 24-Lead Plastic SOL NOTE 0.093 – 0.104 (2.362 – 2.642) 0° – 8° TYP 0.050 (1.270) TYP 0.014 – 0.019 (0.356 – 0.482) LTC1321/LTC1322/LTC1335 1.265 (32.131 0.065 (1.651) TYP 0.018 ± ...
Page 20
... LTC1321/LTC1322/LTC1335 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 FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" ...