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)
LTC1545
Software-Selectable
Multiprotocol Transceiver
FEATURES DESCRIPTIO
n
Software-Selectable Transceiver Supports: The LTC 1545 is a 5-driver/5-receiver multiprotocol trans-
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 ceiver. The LTC1545 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. NET2/071601/98) supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36
n
TBR2 Compliant (Test Report No. CTR2/071601/98) or X.21 protocols. Cable termination may be implemented
n
Software-Selectable Cable Termination Using using the LTC1344A software-selectable cable termination
the LTC1344A chip or by using existing discrete designs.
n
Complete DTE or DCE Port with LTC1543, LTC1344A
The LTC1545 runs from a 5V supply and the charge pump on
n
Operates from Single 5V Supply with LTC1543
the LTC1543. The part is available in a 36-lead SSOP surface
U
mount package.
APPLICATIO S
n
Data Networking
n
CSU and DSU
n , LTC and LT are registered trademarks of Linear Technology Corporation.
Data Routers
TYPICAL APPLICATIO
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
RL TM RI LL CTS DSR DCD DTR RTS TXC SCTE TXD
RXD RXC
LTC1543
LTC1545
D3 D2 D1
D3 D2 D1
D5 D4
R3 R2 R1
R5 R4 R3 R2 R1
LTC1344A
21 25 * 18 13 5 226210 83 20 19 4 1 7 16 3 9 17 12 15 11 24 14 2
*OPTIONAL
DB-25 CONNECTOR
1545 TA01
1
U
ULTC1545
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
TOP VIEW
Supply Voltage
ORDER PART
V ..................................................................... 6.5V
V 1 36 V
CC CC EE NUMBER
V 2 35 GND
DD
V ........................................................ 10V to 0.3V
EE
D1 3 34 D1 A
V ....................................................... 0.3V to 10V
D1
DD
D2 4 33 D1 B
LTC1545CG
Input Voltage
D3 5 32 D2 A
D2
LTC1545IG
Transmitters ........................... 0.3V to (V + 0.3V) R1 6 31 D2 B
CC
R2 D3 30 D3/R1 A
7
Receivers............................................... 18V to 18V
R3 8 29 D3/R1 B
Logic Pins .............................. 0.3V to (V + 0.3V)
CC
D4 9 28 R2 A
R1
Output Voltage
R4 10 27 R2 B
R2
Transmitters .................. (V 0.3V) to (V + 0.3V) M0 11 26 R3 A
EE DD
M1 12 25 R3 B
Receivers................................ 0.3V to (V + 0.3V) R3
CC
M2 13 24 D4 A
Short-Circuit Duration
DCE/DTE 14 D4 23 R4 A
Transmitter Output ..................................... Indefinite
D4ENB R4 22 R5 A
15
21 D5 A
Receiver Output .......................................... Indefinite R4EN 16
R5
R5 17 20 V
DD
V .................................................................. 30 sec
EE
D5 18 D5 19 V
CC
Operating Temperature Range
G PACKAGE
LTC1545C .............................................. 0 C to 70 C
36-LEAD PLASTIC SSOP
LTC1545I........................................... 40 C to 85 C
T = 150 C, q = 65 C/ W
JMAX JA
Storage Temperature Range ................ 65 C to 150 C
Consult factory for Military grade parts.
Lead Temperature (Soldering, 10 sec)................. 300 C
ELECTRICAL CHARACTERISTICS
The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C.
A
V = 5V, V = 8V, V = 7V for V.28, 5.5V for V.10, V.11 (Notes 2, 3)
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 l 2.7 5 mA
CC CC
All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load l 110 150 mA
CC
V.28 Mode, No Load l 13 mA
V.28 Mode, Full Load l 13 mA
No-Cable Mode, D4ENB = HIGH l 10 500 m A
I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, No Load l 2.0 4.0 mA
EE EE
All Digital Pins = GND or V ) RS530, X.21 Modes, Full Load l 23 35 mA
CC
RS530-A, Full Load l 34 50 mA
V.28 Mode, No Load l 13 mA
V.28 Mode, Full Load l 12 18 mA
No-Cable Mode, D4ENB = HIGH l 10 500 m A
I V Supply Current (DCE Mode, RS530, RS530-A, X.21 Modes, NoLoad l 0.3 2 mA
DD DD
All Digital Pins = GND or V ) RS530, RS530-A, X.21 Modes, Full Load l 0.3 2 mA
CC
V.28 Mode, No Load l 13 mA
V.28 Mode, Full Load l 13.5 18 mA
No-Cable Mode, D4ENB = HIGH l 10 500 m A
P Internal Power Dissipation (DCE Mode, RS530, RS530-A, X.21 Modes, Full Load 340 mW
D
(All Digital Pins = GND or V ) V.28 Mode, Full Load 64 mW
CC
2
U W U W
U WW