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LTC2845 Dataheets PDF



Part Number LTC2845
Manufacturers Linear
Logo Linear
Description 3.3V Software-Selectable Multiprotocol Transceiver
Datasheet LTC2845 DatasheetLTC2845 Datasheet (PDF)

U U LTC2845 3.3V Software-Selectable Multiprotocol Transceiver FEATURES s Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 s Operates from Single 3.3V Supply with LTC2846 or a Single 5V Supply with 3.3V Logic with LTC2847 s TUV Rheinland of North America Inc. Certified NET1, NET2 and TBR2 Compliant, Report No.: TBR2/050101/02 s Complete DTE or DCE Port with LTC2846 or LTC2847 s Available in a 36-Lead Narrow (0.209") SSOP and 38-Lead (7mm x 5mm) QFN pac.

  LTC2845   LTC2845


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U U LTC2845 3.3V Software-Selectable Multiprotocol Transceiver FEATURES s Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 s Operates from Single 3.3V Supply with LTC2846 or a Single 5V Supply with 3.3V Logic with LTC2847 s TUV Rheinland of North America Inc. Certified NET1, NET2 and TBR2 Compliant, Report No.: TBR2/050101/02 s Complete DTE or DCE Port with LTC2846 or LTC2847 s Available in a 36-Lead Narrow (0.209") SSOP and 38-Lead (7mm x 5mm) QFN package U APPLICATIO S s Data Networking s CSU and DSU s Data Routers DESCRIPTIO The LTC®2845 is a 5-driver/5-receiver multiprotocol transceiver. The LTC2845 and LTC2846 form the core of a complete software-selectable DTE or DCE interface port that supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36 or X.21 protocols. The LTC2845 operates from a 3.3V supply and supplies provided by the LTC2846. This part is available in a 36-lead SSOP and 38-lead (7mm x 5mm) QFN package. The LTC2845 andLTC2847inQFNpackagesofferthesmallestmultiprotocol serial port available. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO DTE or DCE Multiprotocol Serial Interface with DB-25 Connector RL TM RI LL CTS DSR DCD DTR RTS RXD RXC TXC SCTE TXD LTC2845 D5 D4 R5 R4 R3 R2 R1 D3 D2 D1 LTC2846 D3 D2 D1 R3 R2 R1 TT TTT 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) 21 25 * 18 13 5 22 6 10 8 23 20 19 4 1 7 16 3 9 17 DB-25 CONNECTOR 12 15 11 24 14 2 *OPTIONAL 2845 TA01 sn2845 2845fs 1 U WU U WW W LTC2845 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage VCC ....................................................... –0.3V to 6.5V VIN ..................................................................... – 0.3V to 6.5V VEE ...................................................................... –10V to 0.3V VDD ..................................................................... – 0.3V to 10V Input Voltage Transmitters ........................... – 0.3V to (VCC + 0.3V) Receivers ............................................... – 18V to 18V Logic Pins .............................. – 0.3V to (VCC + 0.3V) Output Voltage Transmitters .................. (VEE – 0.3V) to (VDD + 0.3V) Receivers ................................. – 0.3V to (VIN + 0.3V) Short-Circuit Duration Transmitter Output ..................................... Indefinite Receiver Output .......................................... Indefinite VEE.................................................................. 30 sec Operating Temperature Range LTC2845C ............................................... 0°C to 70°C LTC2845I ........................................... – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C PACKAGE/ORDER INFORMATION TOP VIEW VCC 1 VDD 2 D1 3 D2 4 D3 5 R1 6 R2 7 R3 8 D4 9 R4 10 M0 11 M1 12 M2 13 DCE/DTE 14 D4ENB 15 R4EN 16 R5 17 D5 18 D1 D2 D3 R1 R2 R3 D4 R4 R5 D5 36 VEE 35 GND 34 D1 A 33 D1 B 32 D2 A 31 D2 B 30 D3/R1 A 29 D3/R1 B 28 R2 A 27 R2 B 26 R3 A 25 R3 B 24 D4 A 23 R4 A 22 R5 A 21 D5 A 20 VIN 19 VCC G PACKAGE 36-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 90°C/ W, θJC = 35°C/ W ORDER PART NUMBER LTC2845CG LTC2845IG Consult LTC Marketing for parts specified with wider operating temperature ranges. TOP VIEW D1 VDD VCC VEE VEE GND D1 A D2 1 D3 2 R1 3 R2 4 R3 5 D4 6 R4 7 M0 8 M1 9 M2 10 NC 11 DCE/DTE 12 38 37 36 35 34 33 32 39 13 14 15 16 17 18 19 31 D1 B 30 D2 A 29 D2 B 28 D3/R1 A 27 D3/R1 B 26 R2 A 25 R2 B 24 R3 A 23 R3 B 22 D4 A 21 R4 A 20 R5 A D4ENB R4EN R5 D5 VCC VIN D5 A UHF PACKAGE 38-LEAD (7mm × 5mm) PLASTIC QFN TJMAX = 125°C, θJA = 34°C/ W EXPOSED PAD IS VEE (PIN 39) MUST BE SOLDERED TO PCB ORDER PART NUMBER LTC2845CUHF LTC2845IUHF UHF PART MARKING 2845 2845I ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera- ture range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V for V.28, – 5.5V for V.10, V.11 (Notes 2, 3) SYMBOL Supplies ICC PARAMETER VCC Supply Current (DCE Mode, All Digital Pins = GND or VIN) CONDITIONS MIN RS530, RS530-A, X.21 Modes, No Load RS530, RS530-A, X.21 Modes, Full Load V.28 Mode, No Load V.28 Mode, Full Load No-Cable Mode q q q q TYP MAX UNITS 2.7 110 150 13 13 700 1400 mA mA mA mA µA sn2845 2845fs 2 LTC2845 ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera- ture range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, VDD = 8V, VEE = – 7V for V.28, – 5.5V for V.10, V.11 (Notes 2, 3) SYMBOL IEE PARAMETER VEE Supply Current (DCE Mode, All Digital Pins = GND or VIN) IDD VDD Supply Current (DCE Mode, All Digital Pins = GN.


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