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1
LTC1544
Software-Selectable
Multiprotocol Transceiver
D2
D1
LTC1544
RTS
DTR
DSR
DCD
CTS
D3
R2
R1
R4
R3
D2
LTC1543
LL
TXD
SCTE
TXC
RXC
RXD
2
14
24
11
15
12
17
9
3
1
4
19
20
6
23
22
5
13
8
10
18
7
16
1544 TA01
LTC1344A
D3
R2
R1
R3
D1
TXD A (103)
TXD B
SCTE A (113)
SCTE B
RXC A (115)
RXC B
RXD A (104)
RXD B
RTS A (105)
RTS B
DTR A (108)
DTR B
CTS A (106)
CTS B
LL A (141)
SG (102)
SHIELD (101)
DB-25 CONNECTOR
TXC A (114)
TXC B
DCD A (107)
DCD B
DSR A (109)
DSR B
D4
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Data Networking
s
CSU and DSU
s
Data Routers
s
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
s
TUV/Detecon Inc. Certified NET1 and NET2
Compliant (Test Report No. NET2/102201/97)
s
TBR2 Compliant (Test Report No. CTR2/022701/98)
s
Software-Selectable Cable Termination Using
the LTC1344A
s
Complete DTE or DCE Port with LTC1543, LTC1344A
or LTC1546 with Integrated Termination
s
Operates from Single 5V Supply with LTC1543
The LTC
®
1544 is a 4-driver/4-receiver multiprotocol trans-
ceiver. The LTC1544 and LTC1543 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. Cable termination for the LTC1543 may be
implemented using the LTC1344A software-selectable cable
termination chip or by using existing discrete designs. The
LTC1546 includes software-selectable cable termination on-
chip.
The LTC1544 runs from a 5V supply and the charge pump on
the LTC1543 or LTC1546. The part is available in a 28-lead
SSOP surface mount package.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1544
ORDER PART
NUMBER
(Note 1)
Supply Voltage, V
CC
................................................ 6.5V
Input Voltage
Transmitters ........................... 0.3V to (V
CC
+ 0.3V)
Receivers ............................................... 18V to 18V
Logic Pins .............................. 0.3V to (V
CC
+ 0.3V)
Output Voltage
Transmitters .................. (V
EE
0.3V) to (V
DD
+ 0.3V)
Receivers ................................ 0.3V to (V
CC
+ 0.3V)
V
EE
........................................................ 10V to 0.3V
V
DD
....................................................... 0.3V to 10V
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output .......................................... Indefinite
V
EE
.................................................................. 30 sec
Operating Temperature Range
LTC1544CG ............................................. 0
°
C to 70
°
C
LTC1544IG ........................................ 40
°
C to 85
°
C
Storage Temperature Range ................ 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec)................. 300
°
C
LTC1544CG
LTC1544IG
T
JMAX
= 150
°
C,
JA
= 65
°
C/ W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
V
DD
D1
D2
D3
R1
R2
R3
D4
R4
M0
M1
M2
DCE/DTE
V
EE
GND
D1 A
D1 B
D2 A
D2 B
D3/R1 A
D3/R1 B
R2 A
R2 B
R3 A
R3 B
D4/R4 A
INVERT
R1
D2
D1
R2
D3
G PACKAGE
28-LEAD PLASTIC SSOP
R3
D4
R4
Consult factory for Military grade parts.
The
q
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 5V, V
DD
= 8V, V
EE
= 7V for V.28, 5.5V for V.10, V.11 (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supplies
I
CC
V
CC
Supply Current (DCE Mode,
RS530, RS530-A, X.21 Modes, No Load
2.7
mA
All Digital Pins = GND or V
CC
)
RS530, RS530-A, X.21 Modes, Full Load
q
95
120
mA
V.28 Mode, No Load
q
1
2
mA
V.28 Mode, Full Load
q
1
2
mA
No-Cable Mode
q
10
200
µ
A
I
EE
V
EE
Supply Current (DCE Mode,
RS530, RS530-A, X.21 Modes, No Load
2.1
mA
All Digital Pins = GND or V
CC
)
RS530, X.21 Modes, Full Load
14
mA
V
EE
= 5.6V (RS530, RS530-A Modes) RS530-A, Full Load
25
mA
V
EE
= 8.46V (V.28 Mode)
V.28 Mode, No Load
1
mA
V.28 Mode, Full Load
12
mA
No-Cable Mode
10
µ
A
I
DD
V
DD
Supply Current (DCE Mode,
RS530, RS530-A, X.21 Modes, NoLoad
0.2
mA
All Digital Pins = GND or V
CC
)
RS530, RS530-A, X.21 Modes, Full Load
0.2
mA
V
DD
= 8.73V
V.28 Mode, No Load
1
mA
V.28 Mode, Full Load
12
mA
No-Cable Mode
10
µ
A
P
D
Internal Power Dissipation (DCE Mode,
RS530, RS530-A, X.21 Modes, Full Load
300
mW
(All Digital Pins = GND or V
CC
)
V.28 Mode, Full Load
54
mW
ABSOLUTE AXI U RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
ELECTRICAL CHARACTERISTICS
3
LTC1544
The
q
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 5V, V
DD
= 8V, V
EE
= 7V for V.28, 5.5V for V.10, V.11 (Notes 2, 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Logic Inputs and Outputs
V
IH
Logic Input High Voltage
q
2
V
V
IL
Logic Input Low Voltage
q
0.8
V
I
IN
Logic Input Current
D1, D2, D3, D4
q
±
10
µ
A
M0, M1, M2, DCE, INVERT = GND (LTC1544C)
q
100
50
30
µ
A
M0, M1, M2, DCE, INVERT = GND (LTC1544I)
q
120
50
30
µ
A
M0, M1, M2, DCE, INVERT = V
CC
q
±
10
µ
A
V
OH
Output High Voltage
I
O
= 4mA
q
3
4.5
V
V
OL
Output Low Voltage
I
O
= 4mA
q
0.3
0.8
V
I
OSR
Output Short-Circuit Current
0V
V
O
V
CC
q
50
40
50
mA
I
OZR
Three-State Output Current
M0 = M1 = M2 = V
CC
, 0V
V
O
V
CC
±
1
µ
A
V.11 Driver
V
ODO
Open Circuit Differential Output Voltage
R
L
= 1.95k (Figure 1)
q
±
5
V
V
ODL
Loaded Differential Output Voltage
R
L
= 50
(Figure 1)
0.5V
ODO
0.67V
ODO
V
R
L
= 50
(Figure 1)
q
±
2
V
V
OD
Change in Magnitude of Differential
R
L
= 50
(Figure 1)
q
0.2
V
Output Voltage
V
OC
Common Mode Output Voltage
R
L
= 50
(Figure 1)
q
3
V
V
OC
Change in Magnitude of Common Mode
R
L
= 50
(Figure 1)
q
0.2
V
Output Voltage
I
SS
Short-Circuit Current
V
OUT
= GND
±
150
mA
I
OZ
Output Leakage Current
0.25V
V
O
0.25V, Power Off or
q
±
1
±
100
µ
A
No-Cable Mode or Driver Disabled
t
r
, t
f
Rise or Fall Time
LTC1544C (Figures 2, 5)
q
2
15
25
ns
LTC1544I (Figures 2, 5)
q
2
15
35
ns
t
PLH
Input to Output
LTC1544C (Figures 2, 5)
q
20
40
65
ns
LTC1544I (Figures 2, 5)
q
20
40
75
ns
t
PHL
Input to Output
LTC1544C (Figures 2, 5)
q
20
40
65
ns
LTC1544I (Figures 2, 5)
q
20
40
75
ns
t
Input to Output Difference,
t
PLH
t
PHL
LTC1544C (Figures 2, 5)
q
0
3
12
ns
LTC1544I (Figures 2, 5)
q
0
3
17
ns
t
SKEW
Output to Output Skew
(Figures 2, 5)
3
ns
V.11 Receiver
V
TH
Input Threshold Voltage
7V
V
CM
7V
q
0.2
0.2
V
V
TH
Input Hysteresis
7V
V
CM
7V
q
15
40
mV
I
IN
Input Current (A, B)
10V
V
A,B
10V
q
±
0.66
mA
R
IN
Input Impedance
10V
V
A,B
10V
q
15
30
k
t
r
, t
f
Rise or Fall Time
(Figures 2, 6)
15
ns
t
PLH
Input to Output
LTC1544C (Figures 2, 6)
q
50
80
ns
LTC1544I (Figures 2, 6)
q
50
90
ns
t
PHL
Input to Output
LTC1544C (Figures 2, 6)
q
50
80
ns
LTC1544I (Figures 2, 6)
q
50
90
ns
t
Input to Output Difference,
t
PLH
t
PHL
LTC1544C (Figures 2, 6)
q
0
4
16
ns
LTC1544I (Figures 2, 6)
q
0
4
21
ns
ELECTRICAL CHARACTERISTICS
4
LTC1544
Note 1: Absolute Maximum Ratings are those beyond which the safety of a
device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
are negative. All voltages are referenced to device ground unless otherwise
specified.
Note 3: All typicals are given for V
CC
= 5V, V
DD
= 8V, V
EE
= 7V for V.28,
5.5V for V.10, V.11 and T
A
= 25
°
C.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V.10 Driver
V
O
Output Voltage
Open Circuit, R
L
= 3.9k
q
±
4
±
6
V
V
T
Output Voltage
R
L
= 450
(Figure 3)
q
±
3.6
V
R
L
= 450
(Figure 3)
0.9V
O
I
SS
Short-Circuit Current
V
O
= GND
±
150
mA
I
OZ
Output Leakage Current
0.25V
V
O
0.25V, Power Off or
q
±
0.1
±
100
µ
A
No-Cable Mode or Driver Disabled
t
r
, t
f
Rise or Fall Time
R
L
= 450
, C
L
= 100pF (Figures 3, 7)
2
µ
s
t
PLH
Input to Output
R
L
= 450
, C
L
= 100pF (Figures 3, 7)
1
µ
s
t
PHL
Input to Output
R
L
= 450
, C
L
= 100pF (Figures 3, 7)
1
µ
s
V.10 Receiver
V
TH
Receiver Input Threshold Voltage
q
0.25
0.25
V
V
TH
Receiver Input Hysteresis
q
25
50
mV
I
IN
Receiver Input Current
10V
V
A
10V
q
±
0.66
mA
R
IN
Receiver Input Impedance
10V
V
A
10V
q
15
30
k
t
r
, t
f
Rise or Fall Time
(Figures 4, 8)
15
ns
t
PLH
Input to Output
(Figures 4, 8)
55
ns
t
PHL
Input to Output
(Figures 4, 8)
109
ns
t
Input to Output Difference,
t
PLH
t
PHL
(Figures 4, 8)
60
ns
V.28 Driver
V
O
Output Voltage
Open Circuit
q
±
10
V
R
L
= 3k (Figure 3)
q
±
5
±
8.5
V
I
SS
Short-Circuit Current
V
O
= GND
q
±
150
mA
I
OZ
Output Leakage Current
0.25V
V
O
0.25V, Power Off or
q
±
1
±
100
µ
A
No-Cable Mode or Driver Disabled
SR
Slew Rate
R
L
= 3k, C
L
= 2500pF (Figures 3, 7)
q
4
30
V/
µ
s
t
PLH
Input to Output
R
L
= 3k, C
L
= 2500pF (Figures 3, 7)
q
1.3
2.5
µ
s
t
PHL
Input to Output
R
L
= 3k, C
L
= 2500pF (Figures 3, 7)
q
1.3
2.5
µ
s
V.28 Receiver
V
THL
Input Low Threshold Voltage
q
1.5
0.8
V
V
TLH
Input High Threshold Voltage
q
2
1.6
V
V
TH
Receiver Input Hysterisis
q
0
0.1
0.3
V
R
IN
Receiver Input Impedance
15V
V
A
15V
q
3
5
7
k
t
r
, t
f
Rise or Fall Time
(Figures 4, 8)
15
ns
t
PLH
Input to Output
(Figures 4, 8)
q
60
100
ns
t
PHL
Input to Output
(Figures 4, 8)
q
150
450
ns
The
q
denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 5V, V
DD
= 8V, V
EE
= 7V for V.28, 5.5V for V.10, V.11 (Notes 2, 3)
ELECTRICAL CHARACTERISTICS
5
LTC1544
V
CC
(Pin 1): Positive Supply for the Transceivers. 4.75V
V
CC
5.25V. Connect a 1
µ
F capacitor to ground.
V
DD
(Pin 2): Positive Supply Voltage for V.28. Connect to
V
DD
Pin 3 on LTC1543 or 8V supply. Connect a 1
µ
F
capacitor to ground.
D1 (Pin 3): TTL Level Driver 1 Input.
D2 (Pin 4): TTL Level Driver 2 Input.
D3 (Pin 5): TTL Level Driver 3 Input.
R1 (Pin 6): CMOS Level Receiver 1 Output.
R2 (Pin 7): CMOS Level Receiver 2 Output.
R3 (Pin 8): CMOS Level Receiver 3 Output.
D4 (Pin 9): TTL Level Driver 4 Input.
R4 (Pin 10): CMOS Level Receiver 4 Output.
M0 (Pin 11): TTL Level Mode Select Input 0 with Pull-Up
to V
CC
.
M1 (Pin 12): TTL Level Mode Select Input 1 with Pull-Up
to V
CC
.
M2 (Pin 13): TTL Level Mode Select Input 2 with Pull-Up
to V
CC
.
DCE/DTE (Pin 14): TTL Level Mode Select Input with
Pull-Up to V
CC
.
INVERT (Pin 15): TTL Level Mode Select Input with Pull-
Up to V
CC
.
D4/R4 A (Pin 16): Receiver 4 Inverting Input and Driver 4
Output.
R3 B (Pin 17): Receiver 3 Noninverting Input.
R3 A (Pin 18): Receiver 3 Inverting Input.
R2 B (Pin 19): Receiver 2 Noninverting Input.
R2 A (Pin 20): Receiver 2 Inverting Input.
D3/R1 B (Pin 21): Receiver 1 Noninverting Input and
Driver 3 Noninverting Output.
D3/R1 A (Pin 22): Receiver 1 Inverting Input and Driver 3
Inverting Output.
D2 B (Pin 23): Driver 2 Noninverting Output.
D2 A (Pin 24): Driver 2 Inverting Output.
D1 B (Pin 25): Driver 1 Noninverting Output.
D1 A (Pin 26): Driver 1 Inverting Output.
GND (Pin 27): Ground.
V
EE
(Pin 28): Negative Supply Voltage. Connect to V
EE
Pin
26 on LTC1543 or to 8V supply. Connect a 1
µ
F capacitor
to ground.
Figure 1. V.11 Driver Test Circuit
A
B
A
R
B
1544 F02
R
L
100
C
L
100pF
C
L
100pF
15pF
A
B
1544 F01
V
OD
V
OC
R
L
50
R
L
50
Figure 2. V.11 Driver/Receiver AC Test Circuit
U
U
U
PI FU CTIO S
TEST CIRCUITS
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