LTC2846CG#PBF Linear Technology, LTC2846CG#PBF Datasheet

IC TXRX 3.3V MULTIPROTCOL 36SSOP

LTC2846CG#PBF

Manufacturer Part Number
LTC2846CG#PBF
Description
IC TXRX 3.3V MULTIPROTCOL 36SSOP
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet

Specifications of LTC2846CG#PBF

Number Of Drivers/receivers
3/3
Protocol
Multiprotocol
Voltage - Supply
3.3V
Mounting Type
Surface Mount
Package / Case
36-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Manufacturer
Quantity
Price
Company:
Part Number:
LTC2846CG#PBFLTC2846CG
Manufacturer:
LT
Quantity:
89
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Part Number:
LTC2846CG#PBFLTC2846CG
Manufacturer:
LINEAR/凌特
Quantity:
20 000
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Part Number:
LTC2846CG#PBFLTC2846CG
Quantity:
11
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
Operates from Single 3.3V Supply
TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant, Report No.:
TBR2/050101/02, TBR2/051501/02
1.2MHz Boost Switching Regulator for 3.3V to 5V
Conversion
On-Chip Cable Termination
Complete DTE or DCE Port with LTC2844 or LTC2845
Small Footprint
Available in 36-Lead SSOP (0.209 Wide) Package
Data Networking
CSU and DSU
Data Routers
D4
R4
LL
18
U
CTS
R3
13
5
Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DSR
R2
22
6
R1
U
LTC2844
DCD
D3
10
8
DTR
D2
23
20
RTS
19
D1
DB-25 CONNECTOR
4
1
DESCRIPTIO
The LTC
ceiver with on-chip cable termination. When combined with
the LTC2844 or LTC2845, this chip set forms a complete
software-selectable DTE or DCE interface port that supports
the RS232, RS449, EIA530, EIA530-A, V.35, V.36 and X.21
protocols. All necessary cable termination is provided inside
the LTC2846. The LTC2846 has a boost regulator that takes
in a 3.3V input and switches at 1.2MHz, allowing the use of
tiny, low cost capacitors and inductors 2mm or less in height.
The 5V output drives an internal charge pump that requires
only five space-saving surface mounted capacitors. The
LTC2846 is available in a 36-lead SSOP surface mount
package.
7
, LTC and LT are registered trademarks of Linear Technology Corporation.
3.3V Software-Selectable
Multiprotocol Transceiver
16
RXD
R3
T
3
®
2846 is a 3-driver/3-receiver multiprotocol trans-
RXC
9
R2
T
17
R1
LTC2846
U
with Termination
12
TXC
D3
T
15
SCTE
11
D2
T
24
14
TXD
D1
T
LTC2846
2
2846 TA01
sn2846 2846fs
1

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LTC2846CG#PBF Summary of contents

Page 1

... The 5V output drives an internal charge pump that requires only five space-saving surface mounted capacitors. The LTC2846 is available in a 36-lead SSOP surface mount package. , LTC and LT are registered trademarks of Linear Technology Corporation. DCD DTR RTS RXD ...

Page 2

LTC2846 ABSOLUTE AXI U RATI GS (Note 1) V Voltage.............................................. – 0. Voltage .............................................. – 0.3V to 6.5V IN Input Voltage Transmitters ........................... – 0. Receivers ............................................... – 18V to 18V ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER – V Negative Charge Pump Output Voltage f Charge Pump Oscillator Frequency OSC t Charge Pump Rise Time r Logic Inputs and Outputs V Logic Input High Voltage IH ...

Page 4

LTC2846 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V.11 Receiver V Input Threshold Voltage TH V Input Hysteresis TH R Input Impedance Rise or Fall Time Input to Output ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V.28 Receiver V Input Low Threshold Voltage THL V Input High Threshold Voltage TLH V Receiver Input Hysteresis TH R Receiver Input Impedance Rise or ...

Page 6

LTC2846 W U TYPICAL PERFOR A CE CHARACTERISTICS V.11 Mode I vs Temperature CC 110 105 100 –40 – 100 TEMPERATURE ( C) 2846 G07 Boost Switching Regulator SHDN Pin Current ...

Page 7

CTIO S NC (Pin 1): No Connect. PGND (Pin 2): Boost Switching Regulator Power Ground. Tie PGND to SGND. V (Pin 3): Input Supply Pin. Input supply to boost IN switching regulator 3.6V. ...

Page 8

LTC2846 W BLOCK DIAGRA 2 PGND SHDN – DCE/DTE ...

Page 9

TEST CIRCUITS 2846 F01 Figure 1. V.11 Driver DC Test Circuit – Figure 3. Input Impedance ...

Page 10

LTC2846 W U ODE SELECTIO Table 1 Mode Name DCE/ D1,2 D3 DTE Not Used (Default V.11 TTL X V.11 V.11 V.11 V.11 RS530A TTL X V.11 V.11 V.11 ...

Page 11

U W SWITCHI WAVEFOR PHL – 1. PHL APPLICATIO S I FOR ATIO ...

Page 12

LTC2846 U U APPLICATIO S I FOR ATIO DTE SERIAL LTC2846 CONTROLLER D1 TXD SCTE TXC R2 RXC RXD R3 LTC2844 D1 RTS DTR D2 D3 DCD R1 DSR R2 R3 CTS Figure 17. ...

Page 13

U U APPLICATIO S I FOR ATIO (DATA LTC2846 DCE/DTE 14 DCE/DTE LTC2844 (DATA) Figure 18. Single Port DCE V.35 Mode Selection in the Cable selected. Switching ...

Page 14

LTC2846 U U APPLICATIO S I FOR ATIO ' 20k 6k R6 10k 10k 20k GND Figure 21. V.10 Receiver Configuration BALANCED INTERCONNECTING CABLE GENERATOR TERMINATION ' A ...

Page 15

U U APPLICATIO S I FOR ATIO In V.28 mode closed inside the LTC2846/LTC2844 which connects a 6k (R8) impedance to ground in parallel with 20k (R5) plus 10k (R6) for a combined impedance shown ...

Page 16

LTC2846 U U APPLICATIO S I FOR ATIO Switching Regulator The circuit as shown in Figure 29 can provide up to 480mA drive the LTC2846’s transceiver as well as its companion chip in the DTE-DCE interface. In ...

Page 17

U TYPICAL APPLICATIO S A port with one DB-25 connector, that can be configured for either DTE or DCE operation is shown in Figure 33. The configuration requires separate cables for proper signal routing in DTE or DCE operation. For ...

Page 18

LTC2846 U TYPICAL APPLICATIO • – N • Since power is drawn from the supplies of the LTC2846 ( and less than 100% efficiency, the CC ...

Page 19

U TYPICAL APPLICATIO 3. TXD SCTE TXC RXC RXD RTS DTR DCD DSR CTS Figure 31. Controller-Selectable Multiprotocol DTE Port with ...

Page 20

LTC2846 U TYPICAL APPLICATIO 3. RXD RXC TXC SCTE TXD CTS DSR DCD DTR RTS Figure 32. Controller-Selectable DCE Port with ...

Page 21

U TYPICAL APPLICATIO 3. DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC DTE_TXC/DCE_TXC DTE_RXC/DCE_SCTE DTE_RXD/DCE_TXD DTE_RTS/DCE_CTS DTE_DTR/DCE_DSR DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR DTE_CTS/DCE_RTS DTE_LL/DCE_LL DCE/DTE Figure 33. Controller-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector ...

Page 22

LTC2846 U TYPICAL APPLICATIO 3. DTE_TXD/DCE_RXD DTE_SCTE/DCE_RXC DTE_TXC/DCE_TXC DTE_RXC/DCE_SCTE DTE_RXD/DCE_TXD DTE_RTS/DCE_CTS DTE_DTR/DCE_DSR DTE_DCD/DCE_DCD DTE_DSR/DCE_DTR DTE_CTS/DCE_RTS DTE_LL/DCE_RI DTE_RI/DCE_LL DTE_TM/DCE_RL DTE_RL/DCE_TM DCE/DTE Figure 34. Controller-Selectable Multiprotocol DTE/DCE ...

Page 23

... Figure 35. Cable-Selectable Multiprotocol DTE/DCE Port with DB-25 Connector Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Companion to LTC2846 for Control Signals Including LL 5-Driver/5-Receiver Companion to LTC2846 for Control Signals Including LL, TM and RL www.linear.com 12.50 – 13.10* (.492 – .516 7.40 – 8.20 (.291 – .323 2.0 (.079) 0.05 (.002) G36 SSOP 0802 sn2846 2846fs LT/TP 0503 1K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2002 ...

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