LTC1543
Software-Selectable
Multiprotocol Transceiver
FEATURES
s
s
DESCRIPTIO
s
s
s
s
Software-Selectable Transceiver Supports:
RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21
TUV/Detecon Inc. Certified NET1 and NET2
Compliant (Test Report No. NET2/102201/97)
TBR2 Compliant (Test Report No. CTR2/022701/98)
Software-Selectable Cable Termination Using
the LTC1344A
Complete DTE or DCE Port with LTC1544, LTC1344A
Operates from Single 5V Supply
The LTC
®
1543 is a 3-driver/3-receiver multiprotocol
transceiver that operates from a single 5V supply. The
LTC1543 and LTC1544 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 may be implemented using the
LTC1344A software-selectable cable termination chip or by
using existing discrete designs.
The LTC1543 runs from a single 5V supply using an internal
charge pump that requires only five space-saving surface
mounted capacitors. The part is available in a 28-lead SSOP
surface mount package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Data Networking
CSU and DSU
Data Routers
TYPICAL APPLICATIO
LL
CTS
DSR
DTE or DCE Multiprotocol Serial Interface with DB-25 Connector
DCD
DTR
RTS
RXD
RXC
TXC
SCTE
TXD
LTC1544
D4
R4
R3
R2
R1
D3
D2
D1
R3
R2
R1
LTC1543
D3
D2
D1
18
LL A (141)
13 5
DSR B
CTS B
CTS A (106)
22 6
DSR A (107)
10 8
DCD B
DCD A (109)
23 20 19 4
DTR B
DTR A (108)
RTS B
RTS A (105)
SHIELD (101)
1
SG (102)
7
16 3
RXD B
RXD A (104)
9
RXC B
17
RXC A (115)
12 15 11 24 14
SCTE B
SCTE A (113)
TXD B
TXD A (103)
TXC B
TXC A (114)
DB-25 CONNECTOR
U
LTC1344A
2
1543 TA01
U
U
sn1534 1543fas
1
LTC1543
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
C1
–
C1
+
V
DD
V
CC
D1
D2
D3
R1
R2
1
2
3
4
5
D1
6
7
8
9
R1
R2
R3
D2
D3
23 D1 B
22 D2 A
21 D2 B
20 D3/R1 A
19 D3/R1 B
18 R2 A
17 R2 B
16 R3 A
15 R3 B
G PACKAGE
28-LEAD PLASTIC SSOP
CHARGE PUMP
28 C2
+
27 C2
–
26 V
EE
25 GND
24 D1 A
Supply Voltage ....................................................... 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)
Logic Pins .............................. – 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
LTC1543C .............................................. 0°C to 70°C
LTC1543I ........................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
LTC1543CG
LTC1543IG
R3 10
M0 11
M1 12
M2 13
DCE/DTE 14
T
JMAX
= 150°C,
θ
JA
= 90°C/ W
Consult LTC Marketing for parts specified with wider operating
temperature ranges.
ELECTRICAL CHARACTERISTICS
ture range. V
CC
= 5V (Notes 2, 3)
SYMBOL
Supplies
I
CC
V
CC
Supply Current (DCE Mode,
All Digital Pins = GND or V
CC
)
PARAMETER
The
q
denotes specifications which apply over the full operating tempera-
MIN
TYP
13
100
20
126
20
40
120
230
600
140
q
q
CONDITIONS
RS530, RS530-A, X.21 Modes, No Load
RS530, RS530-A, X.21 Modes, Full Load
V.35 Mode, No Load
V.35 Mode, Full Load
V.28 Mode, No Load
V.28 Mode, Full Load
No-Cable Mode
RS530, RS530-A, X.21 Modes, Full Load
V.35 Mode, Full Load
V.28 Mode, Full Load
Any Mode, No Load
V.28 Mode, with Load
V.28 Mode, with Load, I
DD
= 10mA
V.28, V.35 Modes, No Load
V.28 Mode, Full Load
V.35 Mode, Full Load
RS530, RS530-A, X.21 Modes, Full Load
No-Cable Mode or Power-Up to Turn On
q
q
MAX
UNITS
mA
mA
mA
mA
mA
mA
µA
mW
mW
mW
V
V
V
V
V
V
V
kHz
ms
V
q
q
q
q
130
170
75
500
P
D
Internal Power Dissipation (DCE Mode)
V
+
Positive Charge Pump Output Voltage
8.0
8.0
9.4
8.7
6.5
– 9.6
– 8.5
– 6.7
– 5.7
150
2
V
–
Negative Charge Pump Output Voltage
q
q
q
– 8.0
– 5.5
– 4.5
f
OSC
t
r
V
IH
V
IL
Charge Pump Oscillator Frequency
Supply Rise Time
Logic Input High Voltage
Logic Input Low Voltage
Logic Inputs and Outputs
2
0.8
V
sn1534 1543fas
2
U
W
U
U
W W
W
LTC1543
ELECTRICAL CHARACTERISTICS
ture range. V
CC
= 5V (Notes 2, 3)
SYMBOL
I
IN
PARAMETER
Logic Input Current
CONDITIONS
D1, D2, D3
M0, M1, M2, DCE = GND (LTC1543C)
M0, M1, M2, DCE = GND (LTC1543I)
M0, M1, M2, DCE = V
CC
I
O
= – 4mA
I
O
= 4mA
0V
≤
V
O
≤
V
CC
M0 = M1 = M2 = V
CC
, 0V
≤
V
O
≤
V
CC
R
L
= 1.95k (Figure 1)
R
L
= 50Ω (Figure 1)
R
L
= 50Ω (Figure 1)
R
L
= 50Ω (Figure 1)
R
L
= 50Ω (Figure 1)
R
L
= 50Ω (Figure 1)
V
OUT
= GND
– 0.25V
≤
V
O
≤
0.25V, Power Off or
No-Cable Mode or Driver Disabled
(Figures 2, 6) (LTC1543C)
(Figures 2, 6) (LTC1543I)
(Figures 2, 6) (LTC1543C)
(Figures 2, 6) (LTC1543I)
(Figures 2, 6) (LTC1543C)
(Figures 2, 6) (LTC1543I)
(Figures 2, 6) (LTC1543C)
(Figures 2, 6) (LTC1543I)
(Figures 2, 6)
– 7V
≤
V
CM
≤
7V
– 7V
≤
V
CM
≤
7V
– 10V
≤
V
A,B
≤
10V
– 10V
≤
V
A,B
≤
10V
(Figures 2, 7)
(Figures 2, 7) (LTC1543C)
(Figures 2, 7) (LTC1543I)
(Figures 2, 7) (LTC1543C)
(Figures 2, 7) (LTC1543I)
(Figures 2, 7) (LTC1543C)
(Figures 2, 7) (LTC1543I)
Open Circuit
With Load, – 4V
≤
V
CM
≤
4V (Figure 3)
V
A, B
= 0V
V
A, B
= 0V
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
The
q
denotes specifications which apply over the full operating tempera-
MIN
– 100
– 120
3
– 50
±1
±
5
0.5V
ODO
±2
0.67V
ODO
0.2
3
0.2
150
±
1
2
2
20
20
20
20
0
0
15
15
40
40
40
40
3
3
3
– 0.2
15
15
30
15
50
50
50
50
0
0
4
4
80
90
80
90
16
21
±10.00
±0.66
– 9.0
13
0.2
40
±0.66
±100
25
35
65
75
65
75
12
17
TYP
– 50
– 50
4.5
0.3
0.8
50
MAX
±10
– 30
– 30
±10
UNITS
µA
µA
µA
µA
V
V
mA
µA
V
V
V
V
V
V
mA
µA
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
mV
mA
kΩ
ns
ns
ns
ns
ns
ns
ns
V
V
mA
mA
sn1534 1543fas
V
OH
V
OL
I
OSR
I
OZR
V.11 Driver
V
ODO
V
ODL
∆V
OD
V
OC
∆V
OC
I
SS
I
OZ
t
r
, t
f
t
PLH
t
PHL
∆t
t
SKEW
V
TH
∆V
TH
I
IN
R
IN
t
r
, t
f
t
PLH
t
PHL
∆t
V.35 Driver
V
OD
I
OH
I
OL
Output High Voltage
Output Low Voltage
Output Short-Circuit Current
Three-State Output Current
Open Circuit Differential Output Voltage
Loaded Differential Output Voltage
Change in Magnitude of Differential
Output Voltage
Common Mode Output Voltage
Change in Magnitude of Common Mode
Output Voltage
Short-Circuit Current
Output Leakage Current
Rise or Fall Time
Input to Output
Input to Output
Input to Output Difference,
t
PLH
– t
PHL
Output to Output Skew
Input Threshold Voltage
Input Hysteresis
Input Current (A, B)
Input Impedance
Rise or Fall Time
Input to Output
Input to Output
Input to Output Difference,
t
PLH
– t
PHL
V.11 Receiver
Differential Output Voltage
Transmitter Output High Current
Transmitter Output Low Current
q
q
q
q
±0.44
– 13
9.0
±0.55
– 11
11
3
LTC1543
ELECTRICAL CHARACTERISTICS
ture range. V
CC
= 5V (Notes 2, 3)
SYMBOL
I
OZ
t
r
, t
f
t
PLH
t
PHL
∆t
t
SKEW
V
TH
∆V
TH
I
IN
R
IN
t
r
, t
f
t
PLH
t
PHL
∆t
V.28 Driver
V
O
I
SS
I
OZ
SR
t
PLH
t
PHL
V
THL
V
TLH
∆V
TH
R
IN
t
r
, t
f
t
PLH
t
PHL
Output Voltage
Short-Circuit Current
Output Leakage Current
Slew Rate
Input to Output
Input to Output
Input Low Threshold Voltage
Input High Threshold Voltage
Receiver Input Hysteresis
Receiver Input Impedance
Rise or Fall Time
Input to Output
Input to Output
– 15V
≤
V
A
≤
15V
(Figures 5, 9)
(Figures 5, 9)
(Figures 5, 9)
q
q
The
q
denotes specifications which apply over the full operating tempera-
CONDITIONS
– 0.25V
≤
V
A, B
≤
0.25V
(Figures 3, 6)
(Figures 3, 6) (LTC1543C)
(Figures 3, 6) (LTC1543I)
(Figures 3, 6) (LTC1543C)
(Figures 3, 6) (LTC1543I)
(Figures 3, 6) (LTC1543C)
(Figures 3, 6) (LTC1543I)
(Figures 3, 6)
– 2V
≤
(V
A
+ V
B
)/2
≤
2V (Figure 3)
– 2V
≤
(V
A
+ V
B
)/2
≤
2V (Figure 3)
– 10V
≤
V
A,B
≤
10V
– 10V
≤
V
A,B
≤
10V
(Figures 3, 7)
(Figures 3, 7) (LTC1543C)
(Figures 3, 7) (LTC1543I)
(Figures 3, 7) (LTC1543C)
(Figures 3, 7) (LTC1543I)
(Figures 3, 7) (LTC1543C)
(Figures 3, 7) (LTC1543I)
Open Circuit
R
L
= 3k (Figure 4)
V
OUT
= GND
– 0.25V
≤
V
O
≤
0.25V, Power Off or
No-Cable Mode or Driver Disabled
R
L
= 3k, C
L
= 2500pF (Figures 4, 8)
R
L
= 3k, C
L
= 2500pF (Figures 4, 8)
R
L
= 3k, C
L
= 2500pF (Figures 4, 8)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
PARAMETER
Transmitter Output Leakage Current
Rise or Fall Time
Input to Output
Input to Output
Input to Output Difference,
t
PLH
– t
PHL
Output to Output Skew
Differential Receiver Input Threshold Voltage
Receiver Input Hysteresis
Receiver Input Current (A, B)
Receiver Input Impedance
Rise or Fall Time
Input to Output
Input to Output
Input to Output Difference,
t
PLH
– t
PHL
MIN
TYP
±1
5
MAX
±100
65
75
65
75
16
21
UNITS
µA
ns
ns
ns
ns
ns
ns
ns
ns
20
20
20
20
0
0
35
35
35
35
4
4
4
V.35 Receiver
– 0.2
15
15
30
15
50
50
50
50
0
0
4
4
80
90
80
90
16
21
±10
±150
±1
4
1.5
1.5
1.2
2
0
3
1.2
0.05
5
15
60
160
100
250
0.3
7
±100
30
2.5
3
0.8
0.2
40
±0.66
V
mV
mA
kΩ
ns
ns
ns
ns
ns
ns
ns
V
V
mA
µA
V/µs
µs
µs
V
V
V
kΩ
ns
ns
ns
q
q
q
q
q
q
q
±5
±8.5
V.28 Receiver
q
q
q
q
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, C1 = C2 = C
VCC
= 1µF,
C
VDD
= C
VEE
= 3.3µF tantalum capacitors and T
A
= 25°C.
sn1534 1543fas
4
LTC1543
PI FU CTIO S
C1
–
(Pin 1):
Capacitor C1 Negative Terminal. Connect a
1µF capacitor between C1
+
and C1
–
.
C1
+
(Pin 2):
Capacitor C1 Positive Terminal. Connect a
1µF capacitor between C1
+
and C1
–
.
V
DD
(Pin 3):
Generated Positive Supply Voltage for
V.28. Connect a 1µF capacitor to ground.
V
CC
(Pin 4):
Positive Supply Voltage Input. 4.75V
≤
V
CC
≤
5.25V. Bypass with a 1µF capacitor to ground.
D1 (Pin 5):
TTL Level Driver 1 Input.
D2 (Pin 6):
TTL Level Driver 2 Input.
D3 (Pin 7):
TTL Level Driver 3 Input.
R1 (Pin 8):
CMOS Level Receiver 1 Output.
R2 (Pin 9):
CMOS Level Receiver 2 Output.
R3 (Pin 10):
CMOS Level Receiver 3 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
.
R3 B (Pin 15):
Receiver 3 Noninverting Input with Pull-Up
to V
CC
.
R3 A (Pin 16):
Receiver 3 Inverting Input.
R2 B (Pin 17):
Receiver 2 Noninverting Input.
R2 A (Pin 18):
Receiver 2 Inverting Input.
D3/R1 B (Pin 19):
Receiver 1 Noninverting Input and
Driver 3 Noninverting Output.
D3/R1 A (Pin 20):
Receiver 1 Inverting Input and Driver 3
Inverting Output.
D2 B (Pin 21):
Driver 2 Noninverting Output.
D2 A (Pin 22):
Driver 2 Inverting Output.
D1 B (Pin 23):
Driver 1 Noninverting Output.
D1 A (Pin 24):
Driver 1 Inverting Output.
GND (Pin 25):
Ground.
V
EE
(Pin 26):
Negative Supply Voltage. Connect a 3.3µF
capacitor to GND.
C2
–
(Pin 27):
Capacitor C2 Negative Terminal. Connect a
1µF capacitor between C2
+
and C2
–
.
C2
+
(Pin 28):
Capacitor C2 Positive Terminal. Connect a
1µF capacitor between C2
+
and C2
–
.
TEST CIRCUITS
A
R
L
50Ω
V
OD
R
L
50Ω
B
V
OC
C
L
100pF
C
L
100pF
Figure 1. V.11 Driver Test Circuit
U
U
U
B
A
R
L
100Ω
B
A
R
15pF
1543 F01
1543 F02
Figure 2. V.11 Driver/Receiver AC Test Circuit
sn1534 1543fas
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