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) LTC1544 Software-Selectable Multiprotocol Transceiver FEATURES DESCRIPTIO n Software-Selectable Transceiver Supports: The LTC 1544 is a 4-driver/4-receiver multiprotocol trans- RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 ceiver. The LTC1544 and LTC1543 form the core of a n TUV/Detecon Inc. Certified NET1 and NET2 complete software-selectable DTE or DCE interface port that Compliant (Test Report No. NET2/102201/97) supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 n TBR2 Compliant (Test Report No. CTR2/022701/98) or X.21 protocols. Cable termination for the LTC1543 may be n Software-Selectable Cable Termination Using implemented using the LTC1344A software-selectable cable the LTC1344A termination chip or by using existing discrete designs. The n Complete DTE or DCE Port with LTC1543, LTC1344A LTC1546 includes software-selectable cable termination on- or LTC1546 with Integrated Termination chip. n Operates from Single 5V Supply with LTC1543 The LTC1544 runs from a 5V supply and the charge pump on U the LTC1543 or LTC1546. The part is available in a 28-lead APPLICATIO S 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 D3 D2 D1 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 1544 TA01 1 U ULTC1544 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Supply Voltage, V ................................................ 6.5V CC ORDER PART V 1 28 V EE CC Input Voltage NUMBER V 2 27 GND DD Transmitters ........................... 0.3V to (V + 0.3V) CC D1 3 26 D1 A Receivers............................................... 18V to 18V D1 LTC1544CG D2 4 25 D1 B Logic Pins .............................. 0.3V to (V + 0.3V) CC LTC1544IG D2 D3 5 24 D2 A Output Voltage R1 6 23 D2 B D3 Transmitters .................. (V 0.3V) to (V + 0.3V) EE DD 7 22 D3/R1 A R2 Receivers................................ 0.3V to (V + 0.3V) R1 CC 8 21 D3/R1 B R3 V ........................................................ 10V to 0.3V EE D4 9 R2 20 R2 A V ....................................................... 0.3V to 10V DD R4 10 19 R2 B R3 Short-Circuit Duration M0 11 18 R3 A D4 Transmitter Output ..................................... Indefinite M1 12 17 R3 B Receiver Output .......................................... Indefinite M2 13 R4 16 D4/R4 A DCE/DTE 14 15 INVERT V .................................................................. 30 sec EE Operating Temperature Range G PACKAGE 28-LEAD PLASTIC SSOP LTC1544CG ............................................. 0 C to 70 C T = 150 C, q = 65 C/ W JMAX JA LTC1544IG ........................................ 40 C to 85 C Consult factory for Military grade parts. Storage Temperature Range ................ 65 C to 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating tempera- ture range, otherwise specifications are at T = 25 C. V = 5V, V = 8V, V = 7V for V.28, 5.5V for V.10, V.11 (Notes 2, 3) A CC DD EE SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supplies I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 2.7 mA CC CC All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load l 95 120 mA CC V.28 Mode, No Load l 12 mA V.28 Mode, Full Load l 12 mA No-Cable Mode l 10 200 m A I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 2.1 mA EE EE All Digital Pins = GND or V ) RS530, X.21 Modes, Full Load 14 mA CC V = 5.6V (RS530, RS530-A Modes) RS530-A, Full Load 25 mA EE V = 8.46V (V.28 Mode) V.28 Mode, No Load 1 mA EE V.28 Mode, Full Load 12 mA No-Cable Mode 10 m A I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, NoLoad 0.2 mA DD DD All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load 0.2 mA CC V = 8.73V V.28 Mode, No Load 1 mA DD V.28 Mode, Full Load 12 mA No-Cable Mode 10 m A P Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 300 mW D (All Digital Pins = GND or V ) V.28 Mode, Full Load 54 mW CC 2 U WWW