LTC2846 반도체 회로 부품 판매점
3.3V Software-Selectable Multiprotocol Transceiver with Termination
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 Linear Technology |
www.DataSheet4U.com
LTC2846
3.3V Software-Selectable
Multiprotocol Transceiver
with Termination
FEATURES
s Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
s Operates from Single 3.3V Supply
s TUV Rheinland of North America Inc. Certified NET1,
NET2 and TBR2 Compliant, Report No.:
TBR2/050101/02, TBR2/051501/02
s 1.2MHz Boost Switching Regulator for 3.3V to 5V
Conversion
s On-Chip Cable Termination
s Complete DTE or DCE Port with LTC2844 or LTC2845
s Small Footprint
s Available in 36-Lead SSOP (0.209 Wide) Package
U
APPLICATIO S
s Data Networking
s CSU and DSU
s Data Routers
DESCRIPTIO
The LTC®2846 is a 3-driver/3-receiver multiprotocol trans-
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
LL CTS DSR
DCD DTR RTS
RXD RXC
TXC SCTE TXD
LTC2844
D4
R4 R3 R2 R1
D3 D2 D1
LTC2846
D3 D2 D1
R3 R2 R1
TT
TTT
18 13 5 22 6
10 8 23 20 19 4 1 7 16 3 9 17
12 15 11 24 14 2
DataSheet4 U .com
DB-25 CONNECTOR
2846 TA01
sn2846 2846fs
1
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LTC2846
ABSOLUTE AXI U RATI GS
(Note 1)
VCC Voltage.............................................. – 0.3V to 6.5V
VIN Voltage .............................................. – 0.3V to 6.5V
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)
VEE........................................................ – 10V to 0.3V
VDD ....................................................... – 0.3V to 10V
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output .......................................... Indefinite
VEE.................................................................. 30 sec
SW Voltage ............................................... – 0.4V to 36V
FB Voltage ............................................... – 0.3V to 2.5V
Current into FB Pin .............................................. ±1mA
SHDN Voltage ........................................... – 0.3V to 10V
Operating Temperature Range
LTC2846C ............................................... 0°C to 70°C
LTC2846I ........................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
NC 1
PGND 2
VIN 3
SHDN 4
C1– 5
C1+ 6
VDD 7
VCC 8
D1 9
D2 10
D3 11
R1 12
R2 13
R3 14
M0 15
M1 16
VIN 17
M2 18
TOP VIEW
36 SW
BOOST
SWITCHING
REGULATOR
35 FB
34 SGND
33 C2+
32 C2–
CHARGE PUMP
31 VEE
30 GND
29 D1 A
D1 T
D2 T
28 D1 B
27 D2 A
26 D2 B
D3
25 D3/R1 A
T
24 D3/R1 B
R1
23 R2 A
T
22 R2 B
R2 21 R3 A
T
R3 20 R3 B
19 DCE/DTE
ORDER PART
NUMBER
LTC2846CG
LTC2846IG
G PACKAGE
36-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W, θJC = 35°C/W
*θJA SOLDERED TO A CIRCUIT BOARD IS TYPICALLY 60°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VIN = 3.3V, VSHDN = VIN, unless otherwise noted. (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Supplies
ICC VCC Supply Current (DCE Mode,
All Digital Pins = GND or VIN)
RS530, RS530-A, X.21 Modes, No Load
RS530, RS530-A, X.21 Modes, Full Load
V.35 Mode
V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode
q
q
q
q
14
100 130
126 170
20
35 75
300 900
mA
mA
mA
mA
mA
µA
PD Internal Power Dissipation (DCE Mode) RS530, RS530-A, X.21 Modes, Full Load
V.35 Mode, Full Load
V.28 Mode, Full Load
V + Positive Charge Pump Output Voltage V.11 or V.28 Mode, No Load
V.35 Mode
V.28 Mode, with Load
V.28 Mode, with Load, IDD = 10mA
q8
q7
q8
550
775
200
9.3
8.0
8.7
6.5
mW
mW
mW
V
V
V
V
2
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제조업체: Linear Technology
( linear )
LTC2846 transceiver
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국내 전력반도체 판매점
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전화번호 : 051-319-2877
[ 홈페이지 ]
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전력반도체 문의 : 010-3582-2743
관련 데이터시트
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3.3V Software-Selectable Multiprotocol Transceiver with Termination - Linear Technology
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Software-Selectable Multiprotocol Transceiver - Linear Technology