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 RI (125) LL A (141) TM (142) RL (140) LTC2847 Software-Selectable Multiprotocol Transceiver with Termination and 3.3V Digital Interface FEATURES DESCRIPTIO n Software-Selectable Transceiver Supports: The LTC 2847 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 Operates from Single 5V Supply the LTC2845, this chip set forms a complete software- n Separate Supply Pin for Digital Interface Works selectable DTE or DCE interface port that supports the down to 3V RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21 n On-Chip Cable Termination protocols. All necessary cable termination is provided inside n Complete DTE or DCE Port with LTC2845 the LTC2847. n Available in 38-Pin 5mm 7mm QFN Package The V supplies the drivers, the receivers and an internal CC charge pump that requires only five space-saving surface U mounted capacitors. The V supply drives the digital inter- IN APPLICATIO S face circuitry including the receiver output drivers. It can be n Data Networking tied to V or be powered off a lower supply (down to 3V) to CC n CSU and DSU interface with low voltage ASICs. The LTC2847 is available in n Data Routers a 0.8mm tall, 5mm 7mm QFN package. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector RL TM LL RI CTS DSR DCD DTR RTS RXD RXC TXC SCTE TXD LTC2847 LTC2845 D5 D4 D3 D2 D1 D3 D2 D1 R5 R4 R3 R2 R1 R3 R2 R1 T T T T T 21 25 18 13 5 22 6 10 823 20 19 4 1 716 3 9 17 12 15 11 24 14 2 * DB-25 CONNECTOR 2847 TA01 *OPTIONAL sn2847 2847fs 1 U ULTC2847 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) V Voltage.............................................. 0.3V to 6.5V ORDER PART CC TOP VIEW NUMBER V Voltage .............................................. 0.3V to 6.5V IN 38 37 36 35 34 33 32 Input Voltage LTC2847CUHF NC 1 31 GND Transmitters ........................... 0.3V to (V + 0.3V) CC V LTC2847IUHF 2 30 GND DD Receivers............................................... 18V to 18V NC 3 29 D1 A Logic Pins .............................. 0.3V to (V + 0.3V) CC V 4 28 D1 B CC UHF PART Output Voltage D1 5 27 D2 A MARKING Transmitters ................. (V 0.3V) to (V + 0.3V) EE DD D2 6 26 D2 B Receivers................................. 0.3V to (V + 0.3V) IN D3 7 25 D3/R1 A 2847 V ........................................................ 10V to 0.3V EE R1 8 24 D3/R1 B 2847I V ....................................................... 0.3V to 10V R2 9 23 NC DD R3 10 22 NC Short-Circuit Duration M0 11 21 R2 A Transmitter Output ..................................... Indefinite M1 12 20 R2 B Receiver Output .......................................... Indefinite 13 14 15 16 17 18 19 V .................................................................. 30 sec EE Operating Temperature Range LTC2847C ............................................... 0 C to 70 C UHF PACKAGE LTC2847I........................................... 40 C to 85 C 38-LEAD (7mm 5mm) PLASTIC QFN UNDERSIDE METAL INTERNALLY CONNECTED TO V EE Storage Temperature Range ................ 65 C to 150 C (PCB CONNECTION OPTIONAL) Lead Temperature (Soldering, 10 sec)................. 300 C T = 125 C, q = 34 C/W JMAX JA Consult LTC Marketing 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, V = 3.3V, unless otherwise noted (Notes 2, 3) A CC IN 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 IN 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 300 900 m A I V Supply Current All Modes Except No-Cable Mode 405 m A VIN IN (DCE Mode, All Digital Pins = GND or V ) IN 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 9.3 V V.35 Mode l 7 8.0 V V.28 Mode, with Load l 8 8.7 V V.28 Mode, with Load, I = 10mA 6.5 V DD sn2847 2847fs 2 + V C1 IN M2 C1 V DCE/DTE EE + R3 B C2 R3 A C2 NC V EE NC V EE U WWW