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) LTC2844 3.3V Software-Selectable Multiprotocol Transceiver FEATURES DESCRIPTIO n Software-Selectable Transceiver Supports: The LTC 2844 is a 4-driver/4-receiver multiprotocol trans- RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 ceiver. The LTC2844 and LTC2846 form the core of a n Operates from Single 3.3V Supply with LTC2846 complete software-selectable DTE or DCE interface port that n TUV Rheinland of North America Inc. Certified NET1, supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 NET2 and TBR2 Compliant, or X.21 protocols. Report No.: TBR2/051501/02 The LTC2844 operates from a 3.3V supply and supplies n Complete DTE or DCE Port with LTC2846 provided by the LTC2846. The part is available in a 28-lead n 28-Lead SSOP Surface Mount Package SSOP surface mount package. 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 LL CTS DSR DCD DTR RTS RXD RXC TXC SCTE TXD LTC2846 LTC2844 D4 D3 D2 D1 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 2844 TA01 sn2844 2844fs 1 U ULTC2844 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) Supply Voltage TOP VIEW ORDER PART V ....................................................... 0.3V to 6.5V CC V 1 28 V NUMBER CC EE V ..................................................................... 0.3V to 6.5V V 2 27 GND IN DD V ...................................................................... 10V to 0.3V D1 3 26 D1 A EE LTC2844CG D1 D2 4 25 D1 B V ..................................................................... 0.3V to 10V DD LTC2844IG D2 D3 5 24 D2 A Input Voltage R1 6 23 D2 B D3 Transmitters ............................ 0.3V to (V + 0.3V) CC R2 7 22 D3/R1 A Receivers................................................18V to 18V R1 R3 8 21 D3/R1 B Logic Pins ............................... 0.3V to (V + 0.3V) CC D4 9 R2 20 R2 A Output Voltage R4 10 19 R2 B R3 Transmitters .................. (V 0.3V) to (V + 0.3V) EE DD M0 11 18 R3 A Receivers................................. 0.3V to (V + 0.3V) D4 IN M1 12 17 R3 B Short-Circuit Duration M2 13 R4 16 D4/R4 A Transmitter Output ...................................... Indefinite DCE/DTE 14 15 V IN Receiver Output ........................................... Indefinite G PACKAGE 28-LEAD PLASTIC SSOP V ................................................................... 30 sec EE Operating Temperature Range T = 125 C, q = 90 C/ W, q = 35 C/ W JMAX JA JC LTC2844CG ............................................. 0 C to 70 C Consult LTC Marketing for parts specified with wider operating temperature ranges. LTC2844IG ......................................... 40 C to 85 C 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 = 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 95 120 mA IN V.28 Mode, No Load l 12 mA V.28 Mode, Full Load l 12 mA No-Cable Mode l 600 1200 m A I V Supply Current (DCE Mode Unless RS530, RS530-A, X.21 Modes, No Load 1.6 mA EE EE ) RS530, X.21 Modes, Full Load (DTE Mode) 14 mA Otherwise Noted, All Digital Pins = GND or V IN RS530-A, Full Load (DTE Mode) 25 mA V.28 Mode, No Load 1 mA V.28 Mode, Full Load 7.5 mA No-Cable Mode 10 m A I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 0.2 mA DD DD All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load 0.2 mA IN V.28 Mode, No Load 1 mA V.28 Mode, Full Load 8 mA No-Cable Mode 10 m A I V Supply Current (DCE Mode, All Modes Except No-Cable Mode 490 m A VIN IN All Digital Pins = GND or V ) IN sn2844 2844fs 2 U WWW