LTC1346ACSW#TR [Linear]
LTC1346A - 10Mbps DCE/DTE V.35 Transceiver; Package: SO; Pins: 24; Temperature Range: 0°C to 70°C;![LTC1346ACSW#TR](http://pdffile.icpdf.com/pdf2/p00309/img/icpdf/LTC1346ACSW-_1860865_icpdf.jpg)
型号: | LTC1346ACSW#TR |
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描述: | LTC1346A - 10Mbps DCE/DTE V.35 Transceiver; Package: SO; Pins: 24; Temperature Range: 0°C to 70°C 驱动 光电二极管 接口集成电路 驱动器 |
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LTC1346A
10Mbps DCE/DTE
V.35 Transceiver
U
FEATURES
DESCRIPTIO
The LTC®1346A is a single chip transceiver that provides
the differential clock and data signals for a V.35 interface
from ±5V supplies. Combined with an external resistor
termination network and an LT®1134A RS232 transceiver
forthecontrolsignals,theLTC1346Aformsacompletelow
power DTE or DCE V.35 interface port.
■
Single Chip Provides Complete Differential Signal
Interface for V.35 Port
■
Drivers and Receivers Will Withstand Repeated
±10kV ESD Pulses
■
Operates from ±5V Supplies
■
10Mbaud Transmission Rate
■
Meets CCITT V.35 Specification
The LTC1346A features three current output differential
transmittersandthreedifferentialreceivers.Thetransceiver
can be configured for DTE or DCE operation or shutdown
using three Select pins. In the Shutdown mode, the supply
current is reduced to below 1µA.
■
Shutdown Mode Reduces ICC to Below 1µA
■
Selectable Transmitter and Receiver Configurations
■
Independent Driver/Receiver Enables
■
Transmitter Maintains High Impedance When
Disabled, Shut Down or with Power Off
■
The LTC1346A transceiver operates up to 10Mbaud. All
transmitters feature short-circuit protection. Both the
transmitter outputs and the receiver outputs can be forced
into a high impedance state. The transmitter outputs and
receiver inputs feature ±10kV ESD protection.
Transmitters AreUShort-Circuit Protected
APPLICATIO S
■
Modems
■
Telecommunications
■
Data Routers
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Clock and Data Signals for V.35 Interface
1
1
V
EE1
–5V
V
DTE
DCE
EE2
–5V
+
0.1
F
2
2
F
+
V
0.1
F
V
CC1
5V
CC2
5V
LTC1346A
DX
BI
BI
LTC1346A
+
0.1
+
627T500/1250
627T500/1250
0.1
F
TXD (103)
24
1
12 16
4
5
9
10
11
4
T
T
T
T
T
T
T
T
T
T
RX
RX
DX
DX
DX
23
22
11 15
10 14
2
3
SCTE (113)
TXC (114)
RXC (115)
RXD (104)
DX
21
9
1
13
24
4
18 14
RX
RX
RX
17
2
3
23
22
13
16 12
5
10
15
4
5
21
20
11
14 10
50
50
125
6
7
8
11
7
=
T
13
3
6
19
3
9
V
CC2
GND (102)
8
8
7
8
7
V
BI TECHNOLOGIES
627T500/1250 (SOIC)
CC1
12
12
LTC1346 • TA01
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1
LTC1346A
W
U
W W W
U
/O
PACKAGE RDER I FOR ATIO
ABSOLUTE AXI U RATI GS
(Note 1)
ORDER PART
Supply Voltage
TOP VIEW
NUMBER
VCC .................................................................... 6.5V
VEE................................................................... –6.5V
Input Voltage
V
V
1
2
3
4
5
6
7
8
9
24 Y1
23 Z1
22 Y2
21 Z2
20 Y3
19 Z3
18 A3
17 B3
16 A2
15 B2
14 A1
13 B1
EE
CC
LTC1346ACSW
GND
Transmitters ........................... –0.3V to (VCC + 0.3V)
Receivers............................................... –18V to 18V
S0, S1, S2 ............................... –0.3V to (VCC + 0.3V)
Output Voltage
Transmitters .......................................... –18V to 18V
Receivers................................ –0.3V to (VCC + 0.3V)
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
T1
T2
T3
S1
S2
R3
R2 10
R1 11
S0 12
SW PACKAGE
24-LEAD PLASTIC SO WIDE
LTC1346AC ............................................ 0°C to 70°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TJMAX = 150°C, θJA = 85°C/W
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
DC ELECTRICAL CHARACTERISTICS The ■ denotes specifications which apply over the full operating
temperature range. VCC = 5V ±5%, VEE = –5V ±5% (Note 2)
SYMBOL PARAMETER
CONDITIONS
–4V ≤ V ≤ 4V (Figure 1)
MIN
0.44
–0.6
–12.6
9.4
TYP
0.55
0
MAX
0.66
0.6
UNITS
V
V
V
Transmitter Differential Output Voltage
Transmitter Common Mode Output Voltage
Transmitter Output High Current
■
■
■
■
OD
OC
OS
V
V
V
= 0V (Figure 1)
= 0V
V
OS
I
I
I
–11
11
–9.4
12.6
mA
mA
OH
Y, Z
Y, Z
Transmitter Output Low Current
= 0V
OL
OZ
Transmitter Output Leakage Current
–5V ≤ V ≤ 5V, S1 = S2 = 0V
±1
±20
±100
µA
µA
Y, Z
■
■
R
Transmitter Output Impedance
Differential Receiver Input Threshold Voltage
Receiver Input Hysterisis
–2V ≤ V ≤ 2V
100
25
kΩ
mV
mV
mA
kΩ
V
O
Y, Z
V
–7V ≤ (V + V )/2 ≤ 12V
200
0.7
TH
A
B
∆V
–7V ≤ (V + V )/2 ≤ 12V
50
TH
A
B
I
Receiver Input Current (A, B)
Receiver Input Impedance
–7V ≤ V
–7V ≤ V
≤ 12V
■
■
■
■
■
■
■
■
■
IN
A, B
A, B
R
≤ 12V
17.5
3
30
4.5
0.2
40
IN
V
V
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Output Short-Circuit Current
Receiver Three-State Output Current
Logic Input High Voltage
I = 4mA, V
= 0.2V
OH
OL
O
A, B
A, B
I = 4mA, V
O
= –0.2V
0.4
85
V
I
I
0V ≤ V ≤ V
CC
7
2
mA
µA
V
OSR
OZR
O
S0 = V , 0V ≤ V ≤ V
±10
CC
O
CC
V
V
T, S0, S1, S2
IH
IL
Logic Input Low Voltage
T, S0, S1, S2
T, S0, S1, S2
0.8
V
I
Logic Input Current
±10
µA
IN
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2
LTC1346A
The ■ denotes specifications which apply over the full operating
AC ELECTRICAL CHARACTERISTICS
temperature range. VCC = 5V ±5%, VEE = –5V ±5% (Note 2)
SYMBOL PARAMETER CONDITIONS
= 0V, S0 = Low, S1 = S2 = High (Figure 1)
MIN
TYP
MAX
UNITS
I
I
V
V
Supply Current
Supply Current
V
OS
■
■
■
40
6
0.1
50
9
100
mA
mA
µA
CC
CC
No Load, S0 = Low, S1 = S2 = High
Shutdown, S0 = V , S1 = S2 = 0V
CC
V
= 0V, S0 = Low, S1 = S2 = High (Figure 1)
■
■
■
–40
–6
–0.1
–50
–9
–100
mA
mA
µA
EE
EE
OS
No Load, S0 = Low, S1 = S2 = High
Shutdown, S0 = V , S1 = S2 = 0V
CC
t , t
Transmitter Rise or Fall Time
Transmitter Input to Output
Transmitter Input to Output
Transmitter Output to Output
Receiver Input to Output
V
V
V
V
V
V
V
= 0V (Figures 1, 3)
= 0V (Figures 1, 3)
= 0V (Figures 1, 3)
= 0V (Figures 1, 3)
= 0V (Figures 1, 4)
= 0V (Figures 1, 4)
= 0V (Figures 1, 4)
■
■
■
7
25
30
5
40
70
70
ns
ns
ns
ns
ns
ns
ns
ns
µs
r
f
OS
OS
OS
OS
OS
OS
OS
t
PLH
PHL
SKEW
PLH
PHL
SKEW
ZL
t
t
t
t
t
t
■
■
50
55
5
100
100
Receiver Input to Output
Differential Receiver Skew,
t
– t
PHL
PLH
Receiver Enable to Output Low (Active Mode) C = 15pF, SW1 Closed (Figures 2, 5)
■
■
40
2
70
70
L
Receiver Enable to Output Low
(from Shutdown, Note 3)
C = 15pF, SW1 Closed (Figures 2, 5)
L
t
Receiver Enable to Output High (Active Mode) C = 15pF, SW2 Closed (Figures 2, 5)
35
2
ns
ZH
L
Receiver Enable to Output High
(from Shutdown, Note 3)
C = 15pF, SW2 Closed (Figures 2, 5)
µs
L
t
t
Receiver Disable from Low
Receiver Disable from High
C = 15pF, SW1 Closed (Figures 2, 5)
■
■
30
35
70
70
ns
ns
LZ
L
C = 15pF, SW2 Closed (Figures 2, 5)
L
HZ
Note 1: The Absolute Maximum Ratings are those values beyond which
the life of a device may be impaired.
Note 3: Receiver enable to output valid high or low from Shutdown is
typically 2µs.
Note 2: All currents into device pins are positive; all currents out of device
pins are termed negative. All voltages are referenced to device ground
unless otherwise specified.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Transmitter Output Current
vs Temperature
Transmitter Output Current
vs Output Voltage
Transmitter Output Skew
vs Temperature
13
12
13
12
11
10
9
20
15
V
= 5V
= –5V
T
V
V
= 25°C
V
V
= 5V
= –5V
CC
EE
A
CC
EE
V
= 5V
CC
= –5V
EE
11
10
9
10
5
0
0
0.5
–25
0
50
75 100 125
–2.0 –1.5 –1.0 –0.5
1.0 1.5 2.0
–50
25
–25
0
50
75 100 125
–50
25
OUTPUT VOLTAGE (V)
TEMPERATURE (˚C)
TEMPERATURE (˚C)
1346A G02
1346A G01
1346A G03
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LTC1346A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver tPLH – tPHL
vs Temperature
ICC Supply Current vs Temperature
IEE Supply Current vs Temperature
–25
–30
–5.0
–5.5
20
15
45
40
7.5
7.0
V
CC
V
EE
= 5V
= –5V
V
V
= 5V
= –5V
V
V
= 5V
= –5V
CC
EE
CC
EE
LOADED
NO LOAD
–35
–40
–45
–6.0
–6.5
–7.0
10
5
35
30
25
6.5
6.0
5.5
NO LOAD
LOADED
0
–25
0
50
75 100 125
–50
25
–25
0
50
75 100 125
–50
–25
0
25
50
75 100 125
–50
25
TEMPERATURE (˚C)
TEMPERATURE (˚C)
TEMPERATURE (˚C)
1346A G06
1346A G04
1346A G05
Transmitter Output Waveforms
Receiver Output Waveforms
Receiver Enable from Shutdown
INPUT A–B
1V/DIV
INPUT
5V/DIV
INPUT
0.2V/DIV
INPUT S0
5V/DIV
OUTPUT
0.2V/DIV
OUTPUT
5V/DIV
OUTPUT
5V/DIV
1346A G07
1346A G08
1346A G09
U
U
U
PIN FUNCTIONS
VEE (Pin 1): Negative Supply, –4.75V ≥ VEE ≥ –5.25V
VCC (Pin 2): Positive Supply, 4.75V ≤ VCC ≤ 5.25V
GND (Pin 3): Ground
B1 (Pin 13): Receiver 1 Inverting Input
A1 (Pin 14): Receiver 1 Noninverting Input
B2 (Pin 15): Receiver 2 Inverting Input
T1 (Pin 4): Transmitter 1 Input, TTL Compatible
T2 (Pin 5): Transmitter 2 Input, TTL Compatible
T3 (Pin 6): Transmitter 3 Input, TTL Compatible
S1 (Pin 7): Select Input 1, TTL Compatible
S2 (Pin 8): Select Input 2, TTL Compatible
R3 (Pin 9): Receiver 3 Output, TTL Compatible
R2 (Pin 10): Receiver 2 Output, TTL Compatible
R1 (Pin 11): Receiver 1 Output, TTL Compatible
S0 (Pin 12): Select Input 0, TTL Compatible
A2 (Pin 16): Receiver 2 Noninverting Input
B3 (Pin 17): Receiver 3 Inverting Input
A3 (Pin 18): Receiver 3 Noninverting Input
Z3 (Pin 19): Transmitter 3 Inverting Output
Y3 (Pin 20): Transmitter 3 Noninverting Output
Z2 (Pin 21): Transmitter 2 Inverting Output
Y2 (Pin 22): Transmitter 2 Noninverting Output
Z1 (Pin 23): Transmitter 1 Inverting Output
Y1 (Pin 24): Transmitter 1 Noninverting Output
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LTC1346A
U
U
FU CTIO TABLES
Transmitter and Receiver Configuration
Transmitter
S0
0
1
0
1
0
1
0
1
S1
0
0
1
1
0
0
1
1
S2
0
0
0
0
1
1
1
1
DX ON RX ON Description
INPUTS
CONFIGURATION S0 S1 S2
OUTPUTS
—
1, 2, 3 All RX ON, All DX OFF
T
X
X
0
1
0
1
Y1 AND Y2 Z1 AND Z2 Y3 Z3
—
—
1, 2
—
All OFF, Shutdown
DCE Mode
DCE Mode, All RX OFF
All OFF
0
1
X
X
X
X
0
0
1
1
0
0
0
0
X
X
1
1
Z
Z
0
1
0
1
Z
Z
1
0
1
0
Z
Z
0
1
Z
Z
Z
Z
1
0
Z
Z
1, 2, 3
1, 2, 3
1, 2
Shutdown
DCE or All ON
DCE or All ON
DTE
1, 2, 3 DTE Mode
1, 2
—
DTE Mode, All RX OFF
1, 2, 3
1, 2, 3
1, 2, 3 All ON
—
All DX ON, All RX OFF
DTE
Receiver
INPUTS
CONFIGURATION S0 S1 S2
OUTPUTS
A – B
R1 AND R2
R3
All Rx ON
All Rx ON
Shutdown
DCE
0
0
1
0
0
1
0
0
1
0
0
0
1
1
1
X
X
X
0
0
0
0
0
0
1
1
1
≤ –0.2V
≥0.2V
X
0
1
Z
0
1
Z
0
1
Z
0
1
Z
Z
Z
Z
0
1
Z
≤ –0.2V
≥0.2V
X
DCE
Disabled
DTE or All ON
DTE or All ON
Disabled
≤ –0.2V
≥0.2V
X
TEST CIRCUITS
Y
50Ω
50Ω
V
OS
Y
A
B
125Ω
125Ω
R
T
V
OD
Z
S0
15pF
50Ω
50Ω
V
= (V + V )/2
Y Z
OC
LTC1346A • F01
Z
Figure 1. V.35 Transmitter/Receiver Test Circuit
V
CC
SW1
1k
RECEIVER
OUTPUT
SW2
C
L
LTC1346A • F02
Figure 2. Receiver Output Enable and Disable Timing Test Load
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5
LTC1346A
U W
W
SWITCHI G TI E WAVEFOR S
3V
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
1.5V
1.5V
T
0V
t
t
PHL
PLH
V
O
90%
90%
V
= V(Y) – V(Z)
DIFF
Y – Z
–V
50%
10%
50%
10%
O
1/2 V
O
t
t
f
r
Z
V
O
Y
t
t
SKEW
LTC1346A • F03
SKEW
Figure 3. V.35 Transmitter Propagation Delays
V
/2
OD
A – B
–V /2
f = 1MHz: t ≤ 10ns: t ≤ 10ns
INPUT
r
f
0V
t
0V
t
OD
PLH
PHL
V
OH
OUTPUT
R
1.5V
1.5V
V
OL
LTC1346A • F04
Figure 4. V.35 Receiver Propagation Delays
3V
1.5V
1.5V
S0
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
0V
5V
t
t
LZ
ZL
R
1.5V
1.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0.5V
V
OL
t
t
ZH
HZ
V
OH
0.5V
R
0V
LTC1346A • F05
Figure 5. Receiver Enable and Disable Times
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LTC1346A
U
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APPLICATIONS INFORMATION
Review of CCITT Recommendation V.35
10. No data errors should occur with ±2V common
mode change at either the transmitter/receiver or
±4V ground potential difference between transmit-
ter and receiver.
Electrical Specifications
V.35 is a CCITT recommendation for synchronous data
transmission via modems. Appendix 2 of the recommen-
dation describes the electrical specifications which are
summarized below:
Cable Termination
Each end of the cable connected to an LTC1346A must be
terminated by an external Y- or ∆-resistor network for
proper operation. The Y-termination has two series con-
nected 50Ω resistors and a 125Ω resistor connected
betweengroundandthecentertapofthetwo50Ωresistors
as shown in Figure 6.
1. The interface cable is a balanced twisted pair with 80Ω
to 120Ω impedance.
2. The transmitter’s source impedance is between 50Ω
and 150Ω.
3. The transmitter’s resistance between shorted termi-
nals and ground is 150Ω ±15Ω.
The alternative ∆-termination has a 120Ω resistor across
the twisted wires and two 300Ω resistors between each
wire and ground. Standard 1/8W, 5% surface mount
resistors can be used for the termination network. To
maintain the proper differential output swing, the resistor
tolerance must be 5% or better. A termination network
that combines all the resistors into an SO-14 package is
available from:
4. When terminated by a 100Ω resistive load, the termi-
nal-to-terminal voltage should be 0.55V ±20%.
5. The transmitter’s rise time should be less than 1% of
the signal pulse or 40ns, whichever is greater.
6. Thecommonmodevoltageatthetransmitteroutput
should not exceed 0.6V.
BI Technologies (Formerly Beckman Industrial)
Resistor Networks
7. The receiver impedance is 100Ω ±10Ω.
8. The receiver impedance to ground is 150Ω ±15Ω.
4200 Bonita Place
9. The transmitter or receiver should not be damaged
by connection to earth ground, short-circuiting or
cross connection to other lines.
Fullerton, CA 92635
http://www.bitechnologies.com
Phone: (714) 447-2357
FAX: (714) 447-2500
Part #: BI Technologies 627T500/1250 (SOIC)
899-5-500/1250 (DIP)
50Ω
125Ω
50Ω
Y
300Ω
120Ω
300Ω
LTC1346A • F06
∆
Figure 6. Y- and ∆-Termination Networks
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LTC1346A
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APPLICATIONS INFORMATION
CHIP
BOUNDARY
V
CC
11mA
Y
Z
50Ω
50Ω
125Ω
T
11mA
V
EE
LTC1346A • F07
Figure 7. Simplified Transmitter Schematic
receivers are OFF, all outputs are forced into high imped-
Theory of Operation
ance. The S0 pin can be used as receiver output enable.
In Shutdown mode, ICC drops to 1µA with all transmitters
and receivers OFF. When the LTC1346A is enabled from
Shutdown the transmitters and receivers require 2µs to
stabilize.
The transmitter outputs consist of complementary
switched-current sources as shown in Figure 7.
With a logic zero at the transmitter input, the inverting
output Z sources 11mA and the noninverting output Y
sinks 11mA. The differential transmitter output voltage is
then set by the termination resistors. With two differential
50Ω resistors at each end of the cable, the voltage is set to
(50Ω)(11mA) = 0.55V. With a logic 1 at the transmitter
input, output Z sinks 11mA and Y sources 11mA. The
common mode voltage of Y and Z is 0V when both current
sources are matched and there is no ground potential
difference between the cable terminations. The transmitter
currentsourceshaveacommonmoderangeof±2V,which
allows for a ground difference between cable terminations
of ±4V.
Complete V.35 Port
Figure 8 shows the schematic of a complete surface
mounted, ±5V DTE and DCE V.35 port using only three ICs
and six capacitors per port. The LTC1346A is used to
transmit the clock and data signals and the LT1134A to
transmit the control signals. If test signals 140, 141 and
142 are not used, the transmitter inputs should be tied
to VCC.
RS422/RS485 Applications
Each receiver input has a 30k resistance to ground and
requiresexternalterminationtomeettheV.35inputimped-
ance specification. The receivers have an input hysteresis
of 50mV to improve noise immunity.
The receivers on the LTC1346A can be used for RS422
and RS485 applications. Using the test circuit in Figure 9,
the LTC1346A receivers are able to successfully extract
thedatastreamfromthecommonmodevoltage, meeting
RS422 and RS485 requirements as shown in Figures 10
and 11.
Three Select pins, S0, S1 and S2, configure the chip as
described in Function Tables. When the transmitters and
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LTC1346A
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APPLICATIONS INFORMATION
50Ω
50Ω
DTE
DCE
125Ω
=
T
V
V
EE1
–5V
V
V
CC1
EE2
CC2
5V
–5V
5V
2
1
1
0.1µF
16
2
BI
BI
627T500/
1250
627T500/
1250
0.1µF
0.1µF
0.1µF
LTC1346A
DX
LTC1346A
RX
TXD (103)
(SOIC)
(SOIC)
24
1
P
P
12
4
5
10
T
T
T
T
T
T
T
T
T
T
23
22
11
10
15
14
2
3
S
U
S
U
SCTE (113)
TXC (114)
RXC (115)
RXD (104)
11
4
DX
RX
DX
DX
DX
21
18
9
1
13
24
4
W
W
AA
AA
14
9
RX
RX
RX
17
16
2
3
23
22
13
12
Y
X
Y
X
5
6
10
11
V
T
V
T
15
14
4
5
21
20
11
10
13
3
6
7
19
3
9
7
R
R
GND (102)
B
A
B
A
8
8
12
8
7
7
8
12
CABLE SHIELD
V
V
CC2
CC1
0.2µF
0.2µF
0.2µF
0.2µF
4
3
22 23
4
3
22 23
1
24
1
24
LT1134A
LT1134A
0.1µF
0.1µF
0.1µF
0.1µF
2
DTR (108)
RTS (105)
DSR (107)
CTS (106)
DCD (109)
H
C
H
C
21
19
20
18
16
14
17
15
5
6
8
20
18
21
19
17
15
16
14
DX
DX
RX
RX
RX
RX
DX
DX
RX
RX
DX
DX
DX
DX
RX
RX
7
E
E
6
5
D
F
D
F
8
7
10
12
9
9
TM (142)
RDL (140)
LLB (141)
NN
N
L
NN
N
L
11
10
12
11
13
13
ISO 2593
34-PIN DTE/DCE
ISO 2593
34-PIN DTE/DCE
LTC1346A • TA08
INTERFACE CONNECTOR INTERFACE CONNECTOR
Figure 8. Complete Single ±5V V.35 Interface
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9
LTC1346A
APPLICATIONS INFORMATION
U
W U U
V
V
CC1
CC2
5V
5V
A
A
TTL
OUT
LTC485
100
100
LTC1346A
GND
B
B
GND
+
–
V
TTL
IN
EE
–5V
7V TO –7V
GND POTENTIAL DIFFERENCE
LTC1346A • F09
Figure 9. RS422/RS485 Receiver Interface
RECEIVER
INPUT
5V/DIV
5V
0V
A
B
15V
10V
5V
RECEIVER
OUTPUT
5V/DIV
0V
0V
–5V
RECEIVER
B
A
INPUT
5V
0V
–10V
RECEIVER
OUTPUT
5V/DIV
5V/DIV
LTC1346 • F10
LTC1346 • F11
Figure 10. –7V Common Mode
Figure 11. 12V Common Mode
Multiprotocol Application
The LTC1346A driver will not be damaged or load the
shared lines when disabled. The LTC1346A receiver can
receiveV.35, RS232andRS422signalsasshowninFigure
12b. The LTC1346A receiver is directly compatible with
V.35 and RS422. For RS232 signal, the noninverting input
of the receiver should be grounded. Because the line
termination for each of the protocols is different, some
form of termination switching should be included, either
the connector (as shown in Figures 12a and 12b) or on the
PCB.
The LTC1346A can be used in multiprotocol applications
where V.35, RS232 and RS422 (used in RS530, RS449
among others) signals may appear at the same port. The
LTC1346Aswitchedcurrentsourcedriverisnotcompatible
withRS232orRS422.However,theoutputswhendisabled
cansharelineswithRS232driverswithaShutdownfeature
such as the LT1030 and RS422 drivers with a disable
feature such as the LTC486/LTC487 (Figure 12a).
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10
LTC1346A
U
W U U
APPLICATIONS INFORMATION
LT1030
V.35 DIFFERENTIAL
CONNECTION WITH
TERMINATION
RS422
DIFFERENTIAL
CONNECTION
RS232
CONNECTION
LTC487
NO CONNECTION
50Ω
125Ω
LTC1346A
50Ω
LOGIC
INPUT
1346A F12a
Figure 12a. Multiprotocol Transmitter
RS232
CONNECTION WITH
TERMINATION
V.35 DIFFERENTIAL
CONNECTION WITH
TERMINATION
RS422 DIFFERENTIAL
CONNECTION WITH
TERMINATION
50Ω
LTC1346A
125Ω
LOGIC
OUTPUT
100Ω
5k
50Ω
1346A F12b
Figure 12b. Multiprotocol Receiver
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LTC1346A
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
SW Package
24-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
TYP
.598 – .614
(15.190 – 15.600)
NOTE 4
N
24 23 22 21 20 19 18
16 15 14 13
17
N
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
1
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
.291 – .299
(7.391 – 7.595)
NOTE 4
2
3
5
7
8
9
10
1
4
6
11 12
.037 – .045
.093 – .104
.010 – .029
(0.940 – 1.143)
× 45°
(2.362 – 2.642)
(0.254 – 0.737)
.005
(0.127)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
.009 – .013
(0.102 – 0.305)
NOTE 3
(0.229 – 0.330)
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
S24 (WIDE) 0502
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1134A
5V Only, 4-Driver/4-Receiver RS232 Transceiver
5V Only, Configurable RS232/RS485 Transceiver
Multiprotocol Cable Terminator
Forms Complete V.35 Interface with LTC1346A
Includes On-Chip Charge Pump
LTC1334
LTC1344/LTC1344A
Software Selectable, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
LTC1544
LTC1545
LTC1546
LTC2844
LTC2845
LTC2846
4-Driver, 4-Receiver Multiprotocol Transceiver
5-Driver, 5-Receiver Multiprotocol Transceiver
5V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
5V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
3-Driver, 3-Receiver Multiprotocol Transceiver
with Termination
5V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
3.3V, 4-Driver, 4-Receiver Multiprotocol Transceiver
3.3V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
3.3V, 5-Driver, 5-Receiver Multiprotocol Transceiver
3.3V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
3.3V, 3-Driver, 3-Receiver Multiprotocol Transceiver
with Termination
3.3V Supply, Supports V.35, V.36, V.28, EIA-530, EIA-530-A,
RS449, X.21
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LW/TP 1002 1K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
■
■
LINEAR TECHNOLOGY CORPORATION 1995
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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