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)
LTC1544
Software-Selectable
Multiprotocol Transceiver
FEATURES
DESCRIPTIO
n
Software-Selectable Transceiver Supports: The LTC 1544 is a 4-driver/4-receiver multiprotocol trans-
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 ceiver. The LTC1544 and LTC1543 form the core of a
n
TUV/Detecon Inc. Certified NET1 and NET2 complete software-selectable DTE or DCE interface port that
Compliant (Test Report No. NET2/102201/97) supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36
n
TBR2 Compliant (Test Report No. CTR2/022701/98) or X.21 protocols. Cable termination for the LTC1543 may be
n
Software-Selectable Cable Termination Using implemented using the LTC1344A software-selectable cable
the LTC1344A termination chip or by using existing discrete designs. The
n
Complete DTE or DCE Port with LTC1543, LTC1344A LTC1546 includes software-selectable cable termination on-
or LTC1546 with Integrated Termination chip.
n
Operates from Single 5V Supply with LTC1543
The LTC1544 runs from a 5V supply and the charge pump on
U
the LTC1543 or LTC1546. The part is available in a 28-lead
APPLICATIO S
SSOP surface mount package.
n
Data Networking
n
CSU and DSU
n
Data Routers , LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
LL
CTS DSR DCD DTR RTS TXC SCTE TXD
RXD RXC
LTC1544 LTC1543
D3 D2 D1
D4 D3 D2 D1
R4 R3 R2 R1 R3 R2 R1
LTC1344A
18 13 5 226210 83 20 19 4 1 7 16 3 9 17 12 15 11 24 14 2
DB-25 CONNECTOR
1544 TA01
1
U
ULTC1544
UUW
ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
Supply Voltage, V ................................................ 6.5V
CC
ORDER PART
V 1 28 V
EE
CC
Input Voltage
NUMBER
V 2 27 GND
DD
Transmitters ........................... 0.3V to (V + 0.3V)
CC
D1 3 26 D1 A
Receivers............................................... 18V to 18V
D1
LTC1544CG
D2 4 25 D1 B
Logic Pins .............................. 0.3V to (V + 0.3V)
CC
LTC1544IG
D2
D3 5 24 D2 A
Output Voltage
R1 6 23 D2 B
D3
Transmitters .................. (V 0.3V) to (V + 0.3V)
EE DD
7 22 D3/R1 A
R2
Receivers................................ 0.3V to (V + 0.3V) R1
CC
8 21 D3/R1 B
R3
V ........................................................ 10V to 0.3V
EE
D4 9 R2 20 R2 A
V ....................................................... 0.3V to 10V
DD
R4 10 19 R2 B
R3
Short-Circuit Duration
M0 11 18 R3 A
D4
Transmitter Output ..................................... Indefinite
M1 12 17 R3 B
Receiver Output .......................................... Indefinite M2 13 R4 16 D4/R4 A
DCE/DTE 14 15 INVERT
V .................................................................. 30 sec
EE
Operating Temperature Range
G PACKAGE
28-LEAD PLASTIC SSOP
LTC1544CG ............................................. 0 C to 70 C
T = 150 C, q = 65 C/ W
JMAX JA
LTC1544IG ........................................ 40 C to 85 C
Consult factory for Military grade parts.
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 = 8V, V = 7V for V.28, 5.5V for V.10, V.11 (Notes 2, 3)
A CC DD EE
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
CC
V.28 Mode, No Load l 12 mA
V.28 Mode, Full Load l 12 mA
No-Cable Mode l 10 200 m A
I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load 2.1 mA
EE EE
All Digital Pins = GND or V ) RS530, X.21 Modes, Full Load 14 mA
CC
V = 5.6V (RS530, RS530-A Modes) RS530-A, Full Load 25 mA
EE
V = 8.46V (V.28 Mode) V.28 Mode, No Load 1 mA
EE
V.28 Mode, Full Load 12 mA
No-Cable Mode 10 m A
I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, NoLoad 0.2 mA
DD DD
All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load 0.2 mA
CC
V = 8.73V V.28 Mode, No Load 1 mA
DD
V.28 Mode, Full Load 12 mA
No-Cable Mode 10 m A
P Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 300 mW
D
(All Digital Pins = GND or V ) V.28 Mode, Full Load 54 mW
CC
2
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