TXD A (103) TXD B SCTE A (113) SCTE B TXC A (114) TXC B RXC A (115) RXC B RXD A (104) RXD B SG (102) SHIELD (101) RTS A (105) RTS B DTR A (108) DTR B DCD A (109) DCD B DSR A (107) DSR B CTS A (106) CTS B LL A (141) LTC1543 Software-Selectable Multiprotocol Transceiver FEATURES DESCRIPTIO n The LTC 1543 is a 3-driver/3-receiver multiprotocol Software-Selectable Transceiver Supports: transceiver that operates from a single 5V supply. The RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 n LTC1543 and LTC1544 form the core of a complete software- TUV/Detecon Inc. Certified NET1 and NET2 selectable DTE or DCE interface port that supports the Compliant (Test Report No. NET2/102201/97) n RS232, RS449, EIA530, EIA530-A, V.35, V.36 or X.21 TBR2 Compliant (Test Report No. CTR2/022701/98) n protocols. Cable termination may be implemented using the Software-Selectable Cable Termination Using LTC1344A software-selectable cable termination chip or by the LTC1344A n using existing discrete designs. Complete DTE or DCE Port with LTC1544, LTC1344A n Operates from Single 5V Supply The LTC1543 runs from a single 5V supply using an internal U charge pump that requires only five space-saving surface APPLICATIO S mounted capacitors. The part is available in a 28-lead SSOP surface mount package. n Data Networking n CSU and DSU n Data Routers , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO DTE or DCE Multiprotocol Serial Interface with DB-25 Connector LL CTS DSR DCD DTR RTS TXC SCTE TXD RXD RXC LTC1544 LTC1543 D3 D2 D1 D4 D2 D1 D3 R4 R3 R2 R1 R3 R2 R1 LTC1344A 18 13 5 226210 83 20 19 4 1 7 16 3 9 17 12 15 11 24 14 2 DB-25 CONNECTOR 1543 TA01 sn1534 1543fas 1 U ULTC1543 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) Supply Voltage ....................................................... 6.5V TOP VIEW ORDER PART Input Voltage + NUMBER C1 1 28 C2 Transmitters ........................... 0.3V to (V + 0.3V) + CC C1 2 27 C2 CHARGE PUMP Receivers............................................... 18V to 18V V 3 26 V DD EE LTC1543CG Logic Pins .............................. 0.3V to (V + 0.3V) CC V 4 25 GND CC LTC1543IG Output Voltage D1 5 24 D1 A D1 Transmitters ................. (V 0.3V) to (V + 0.3V) EE DD D2 6 23 D1 B Receivers................................ 0.3V to (V + 0.3V) D2 CC 7 22 D2 A D3 Logic Pins .............................. 0.3V to (V + 0.3V) CC R1 8 21 D2 B D3 V ........................................................ 10V to 0.3V EE R2 9 20 D3/R1 A V ....................................................... 0.3V to 10V DD R3 10 19 D3/R1 B R1 Short-Circuit Duration M0 11 18 R2 A R2 Transmitter Output ..................................... Indefinite M1 12 17 R2 B Receiver Output .......................................... Indefinite M2 13 16 R3 A R3 V .................................................................. 30 sec DCE/DTE 14 15 R3 B EE Operating Temperature Range G PACKAGE 28-LEAD PLASTIC SSOP LTC1543C .............................................. 0 C to 70 C T = 150 C, q = 90 C/ W JMAX JA LTC1543I........................................... 40 C to 85 C Storage Temperature Range ................ 65 C to 150 C Consult LTC Marketing for parts specified with wider operating Lead Temperature (Soldering, 10 sec)................. 300 C temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating tempera- ture range. V = 5V (Notes 2, 3) CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supplies I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 13 mA CC CC All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load l 100 130 mA CC V.35 Mode, No Load 20 mA V.35 Mode, Full Load l 126 170 mA V.28 Mode, No Load 20 mA V.28 Mode, Full Load l 40 75 mA No-Cable Mode l 120 500 m A P Internal Power Dissipation (DCE Mode) RS530, RS530-A, X.21 Modes, Full Load 230 mW D V.35 Mode, Full Load 600 mW V.28 Mode, Full Load 140 mW + V Positive Charge Pump Output Voltage Any Mode, No Load l 8.0 9.4 V V.28 Mode, with Load l 8.0 8.7 V V.28 Mode, with Load, I = 10mA 6.5 V DD V Negative Charge Pump Output Voltage V.28, V.35 Modes, No Load 9.6 V V.28 Mode, Full Load l 8.0 8.5 V V.35 Mode, Full Load l 5.5 6.7 V RS530, RS530-A, X.21 Modes, Full Load l 4.5 5.7 V f Charge Pump Oscillator Frequency 150 kHz OSC t Supply Rise Time No-Cable Mode or Power-Up to Turn On 2 ms r Logic Inputs and Outputs V Logic Input High Voltage l2V IH V Logic Input Low Voltage l 0.8 V IL sn1534 1543fas 2 U WWW