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PDF LTC1345CSW Data sheet ( Hoja de datos )
| Número de pieza | LTC1345CSW | |
| Descripción | Single Supply V.35 Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Single Chip Provides All V.35 Differential Clock
and Data Signals
s Operates From Single 5V Supply
s Software Selectable DTE or DCE Configuration
s Transmitters and Receivers Will Withstand
Repeated ±10kV ESD Pulses
s Shutdown Mode Reduces ICC to 1µA Typ
s 10MBaud Transmission Rate
s Transmitter Maintains High Impedance When
Disabled, Shut Down, or with Power Off
s Meets CCITT V.35 Specification
s Transmitters are Short-Circuit Protected
U
APPLICATIO S
s Modems
s Telecommunications
s Data Routers
LTC1345
Single Supply
V.35 Transceiver
DESCRIPTIO
The LTC®1345 is a single chip transceiver that provides the
differential clock and data signals for a V.35 interface from
a single 5V supply. Combined with an external resistor
termination network and an LT®1134A RS232 transceiver
for the control signals, the LTC1345 forms a complete low
power DTE or DCE V.35 interface port operating from a
single 5V supply.
The LTC1345 features three current output differential
transmitters, three differential receivers, and a charge
pump. The transceiver can be configured for DTE or DCE
operation or shut down using two Select pins. In the
Shutdown mode, the supply current is reduced to 1µA.
The transceiver operates up to 10Mbaud. All transmitters
feature short-circuit protection and a Receiver Output
Enable pin allows the receiver outputs to be forced into a
high impedance state. Both transmitter outputs and re-
ceiver inputs feature ±10kV ESD protection. The charge
pump features a regulated VEE output using three external
1µF capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
1µF 1µF
Clock and Data Signals for V.35 Interface
1µF 1µF
VCC1
5V
3
1µF
6
4 21
LTC1345
DX
DTE
28
27
1µF
BI
627T500/1250
26 1
25 2 T
TXD (103)
DCE
BI
627T500/1250
12
T 11
27
1µF
18
17
28 1 2
LTC1345
RX
4
3
12
VCC2
5V
1µF
7
DX
24 3
23 4 T
SCTE (113)
10 16
T9
15
RX
13
20 14
11
RX
19 13
T
TXC (114)
1
T2
26
25
6
DX
18 12
12
RX
17 11
T
RXC (115)
3
T4
24
23
7
DX
16 10
13
RX 15 9 T
57
RXD (104)
5
T6
7
22
21
5
8
DX
50Ω 125Ω
T=
50Ω
9 10 14
VCC1
8 GND (102)
8
9
VCC2
10 14
BI TECHNOLOGIES
627T500/1250 (SOIC) OR
899TR50/125 (DIP)
LTC1345 • TA01
1
1 page  
PI FU CTIO S
Y3 (Pin 22): Transmitter 3 Noninverting Output.
Z2 (Pin 23): Transmitter 2 Inverting Output.
Y2 (Pin 24): Transmitter 2 Noninverting Output
Z1 (Pin 25): Transmitter 1 Inverting Output.
LTC1345
Y1 (Pin 26): Transmitter 1 Noninverting Output.
VEE (Pin 27): Charge Pump Output. Connected to negative
terminal of capacitor C3.
C2 – (Pin 28): Capacitor C2 Negative Terminal.
FU CTIO TABLES
Transmitter and Receiver Configuration
S1 S2 TX# RX# REMARKS
0 0 — — Shutdown
1 0 1, 2, 3 1, 2 DCE Mode, RX3 Shut Down
0 1 1, 2 1, 2, 3 DTE Mode, TX3 Shut Down
1 1 1, 2, 3 1, 2, 3 All Active
Transmitter
INPUTS
OUTPUTS
CONFIGURATION S1 S2 T Y1 AND Y2 Z1 AND Z2 Y3 Z3
DTE
01 0
0
1 ZZ
DTE
01 1
1
0 ZZ
DCE or All ON
1X 0
0
1 01
DCE or All ON
1X 1
1
0 10
Shutdown
00 X
Z
Z ZZ
Receiver
INPUTS
CONFIGURATION S1 S2 OE B – A
DTE or All ON
X 1 0 ≥ 0.2V
DTE or All ON
X 1 0 ≤ – 0.2V
DCE 1 0 0 ≥ 0.2V
DCE 1 0 0 ≤ – 0.2V
Disabled
XX 1
X
Shutdown
00 X
X
OUTPUTS
R1 AND R2 R3
11
00
1Z
0Z
ZZ
ZZ
TEST CIRCUITS
Y
50Ω
T
Y
VOD
125Ω
VOS 125Ω 50Ω B
Z
50Ω
A
50Ω
VOC = (VY + VZ)/2
Z
R
OE
15pF
LTC1345 • F01
Figure 1. V.35 Transmitter/Receiver Test Circuit
RECEIVER
OUTPUT
1k
CL
VCC
S1
S2
LTC1345 • F02
Figure 2. Receiver Output Enable/Disable Timing Test Load
5
5 Page 
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
LTC1345
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
1.455*
(36.957)
MAX
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.505 – 0.560*
(12.827 – 14.224)
0.600 – 0.625
(15.240 – 15.875)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.150 ± 0.005
(3.810 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.009 – 0.015
(0.229 – 0.381)
0.015
(0.381)
MIN
+0.035
0.625 –0.015
( )15.87
+0.889
–0.381
0.125
(3.175)
MIN
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.035 – 0.080
(0.889 – 2.032)
0.100
(2.54)
BSC
0.018 ± 0.003
(0.457 ± 0.076)
0.070
(1.778)
TYP
N28 1098
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1345CSW.PDF ] | |
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