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) LTC1546 Software-Selectable Multiprotocol Transceiver with Termination FEATURES DESCRIPTIO n Software-Selectable Transceiver Supports: The LTC 1546 is a 3-driver/3-receiver multiprotocol trans- RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 ceiver with on-chip cable termination. When combined with n TUV Telecom Services Inc. Certified NET1, the LTC1544, this chip set forms a complete software- NET2 and TBR2 Compliant selectable DTE or DCE interface port that supports the n On-Chip Cable Termination RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21 n Pin Compatible with LTC1543 protocols. All necessary cable termination is provided inside n Complete DTE or DCE Port with LTC1544 the LTC1546. In most applications, the LTC1546 replaces n Operates from Single 5V Supply both an LTC1543 and an LTC1344A without any changes to n Small Footprint the PC board. The LTC1546 runs from a single 5V supply using an internal U charge pump that requires only five space-saving surface APPLICATIO S mounted capacitors. The LTC1546 is available in a 28-lead n Data Networking SSOP surface mount package. n CSU and DSU , LTC and LT are registered trademarks of Linear Technology Corporation. n Data Routers TYPICAL APPLICATION Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector LL CTS DSR DCD DTR RTS TXC SCTE TXD RXD RXC LTC1544 LTC1546 D4 D2 D1 D3 D3 D2 D1 R4 R3 R2 R1 R3 R2 R1 T T T T T 18 13 5 226210 83 20 19 4 1 7 16 3 9 17 12 15 11 24 14 2 DB-25 CONNECTOR 1546 TA01 1 U ULTC1546 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) Supply Voltage ....................................................... 6.5V ORDER PART TOP VIEW Input Voltage NUMBER + C1 1 28 C2 Transmitters ........................... 0.3V to (V + 0.3V) CC + C1 2 27 C2 Receivers............................................... 18V to 18V CHARGE PUMP 3 V V 26 DD EE LTC1546CG Logic Pins .............................. 0.3V to (V + 0.3V) CC V 4 25 GND CC LTC1546IG Output Voltage D1 5 24 D1 A D1 T Transmitters ................. (V 0.3V) to (V + 0.3V) EE DD D2 6 23 D1 B Receivers................................ 0.3V to (V + 0.3V) CC D2 T D3 7 22 D2 A V ........................................................ 10V to 0.3V EE R1 8 21 D2 B D3 V ....................................................... 0.3V to 10V DD R2 9 20 D3/R1 A T Short-Circuit Duration R3 10 19 D3/R1 B R1 Transmitter Output ..................................... Indefinite M0 11 18 R2 A T Receiver Output .......................................... Indefinite R2 12 17 R2 B M1 V .................................................................. 30 sec EE M2 13 16 R3 A R3 T Operating Temperature Range DCE/DTE 14 15 R3 B LTC1546C ............................................... 0 C to 70 C G PACKAGE LTC1546I........................................... 40 C to 85 C 28-LEAD PLASTIC SSOP Storage Temperature Range ................ 65 C to 150 C T = 150 C, q = 90 C/ W* JMAX JA Lead Temperature (Soldering, 10 sec)................. 300 C *q SOLDERED TO A CIRCUIT BOARD JA IS TYPICALLY 60 C/W Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V (Notes 2, 3) A CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Supplies I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 14 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 l 126 170 mA V.28 Mode, No Load 20 mA V.28 Mode, Full Load l 35 75 mA No-Cable Mode l 60 500 m A P Internal Power Dissipation (DCE Mode) RS530, RS530-A, X.21 Modes, Full Load 410 mW D V.35 Mode, Full Load 625 mW V.28 Mode, Full Load 150 mW + V Positive Charge Pump Output Voltage V.11 or V.28 Mode, No Load l 8.0 9.3 V V.35 Mode l 7.0 8.0 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 Mode, No Load 9.6 V V.28 Mode, Full Load l 7.5 8.5 V V.35 Mode l 5.5 6.5 V RS530, RS530-A, X.21 Modes, Full Load l 4.5 6.0 V 2 U WWW