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) RI A (125) TM A (142) RL A (140) LTC2845 3.3V Software-Selectable Multiprotocol Transceiver FEATURES DESCRIPTIO n Software-Selectable Transceiver Supports: The LTC 2845 is a 5-driver/5-receiver multiprotocol trans- RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 ceiver. The LTC2845 and LTC2846 form the core of a n Operates from Single 3.3V Supply with LTC2846 or complete software-selectable DTE or DCE interface port that a Single 5V Supply with 3.3V Logic with LTC2847 supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 n TUV Rheinland of North America Inc. Certified NET1, or X.21 protocols. NET2 and TBR2 Compliant, The LTC2845 operates from a 3.3V supply and supplies Report No.: TBR2/050101/02 provided by the LTC2846. This part is available in a 36-lead n Complete DTE or DCE Port with LTC2846 or LTC2847 SSOP and 38-lead (7mm x 5mm) QFN package. The LTC2845 n Available in a 36-Lead Narrow (0.209 ) SSOP and and LTC2847 in QFN packages offer the smallest multiprotocol 38-Lead (7mm x 5mm) QFN package serial port available. U , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S n Data Networking n CSU and DSU n Data Routers TYPICAL APPLICATIO DTE or DCE Multiprotocol Serial Interface with DB-25 Connector RL TM RI LL CTS DSR DCD DTR RTS TXC SCTE TXD RXD RXC LTC2846 LTC2845 D2 D1 D5 D4 D3 D3 D2 D1 R3 R2 R1 R5 R4 R3 R2 R1 T T T T T 21 25 * 18 13 5 226210 83 20 19 4 1 7 16 3 9 17 12 15 11 24 14 2 *OPTIONAL DB-25 CONNECTOR 2845 TA01 sn2845 2845fs 1 U ULTC2845 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage Short-Circuit Duration V ....................................................... 0.3V to 6.5V Transmitter Output ..................................... Indefinite CC V ..................................................................... 0.3V to 6.5V Receiver Output .......................................... Indefinite IN V ...................................................................... 10V to 0.3V V .................................................................. 30 sec EE EE V ..................................................................... 0.3V to 10V Operating Temperature Range DD Input Voltage LTC2845C ............................................... 0 C to 70 C Transmitters ........................... 0.3V to (V + 0.3V) LTC2845I........................................... 40 C to 85 C CC Receivers............................................... 18V to 18V Storage Temperature Range ................ 65 C to 150 C Logic Pins .............................. 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec)................. 300 C CC Output Voltage Transmitters .................. (V 0.3V) to (V + 0.3V) EE DD Receivers................................. 0.3V to (V + 0.3V) IN PACKAGE/ORDER INFORMATION TOP VIEW TOP VIEW ORDER PART ORDER PART V 1 36 V NUMBER CC EE NUMBER 38 37 36 35 34 33 32 V 2 35 GND DD D2 1 31 D1 B D1 3 34 D1 A D1 LTC2845CUHF LTC2845CG D3 2 30 D2 A D2 4 33 D1 B R1 D2 B D3 32 D2 A 3 29 5 D2 LTC2845IUHF LTC2845IG R2 4 28 D3/R1 A R1 6 31 D2 B R2 7 D3 30 D3/R1 A R3 5 27 D3/R1 B 29 D3/R1 B R3 8 D4 6 26 R2 A 39 D4 9 28 R2 A R1 R4 7 25 R2 B R4 10 27 R2 B M0 8 24 R3 A R2 M0 11 26 R3 A M1 9 23 R3 B M1 12 25 R3 B UHF PART M2 10 22 D4 A R3 M2 13 24 D4 A 21 NC 11 R4 A MARKING D4 DCE/DTE 14 23 R4 A DCE/DTE 12 20 R5 A D4ENB 15 R4 22 R5 A 13 14 15 16 17 18 19 2845 R4EN 21 D5 A 16 R5 17 R5 20 V IN 2845I D5 18 19 V D5 CC UHF PACKAGE 38-LEAD (7mm 5mm) PLASTIC QFN G PACKAGE T = 125 C, q = 34 C/ W JMAX JA 36-LEAD PLASTIC SSOP EXPOSED PAD IS V (PIN 39) EE T = 125 C, q = 90 C/ W, q = 35 C/ W JMAX JA JC MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. 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 = 3.3V, V = 8V, V = 7V for V.28, 5.5V for V.10, V.11 A CC IN DD EE (Notes 2, 3) 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 110 150 mA IN V.28 Mode, No Load l 13 mA V.28 Mode, Full Load l 13 mA No-Cable Mode l 700 1400 m A sn2845 2845fs 2 D4ENB D1 R4EN V DD R5 V CC D5 V EE V V CC EE V GND IN D5 A D1 A U W U W U WW