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PDF 1318 Data sheet ( Hoja de datos )
| Número de pieza | 1318 | |
| Descripción | Single 5V RS232/RS422/AppleTalk DCE Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 1318 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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LTC1318
Single 5V
RS232/RS422/AppleTalk®
DCE Transceiver
FEATURES
s Single Chip Provides DCE RS232 or
RS422/AppleTalk DCE Port
s Operates from a Single 5V Supply
s Charge Pump Uses 0.1µF Capacitors
s Output Common-Mode Voltage Range Exceeds
Power Supply Rails for All Drivers
s Driver Outputs Are High Impedance with Power Off
s Pin Selectable RS232/RS422 Receiver
s Thermal Shutdown Protection
s Drivers Are Short-Circuit Protected
APPLICATIONS
s Dual-Mode RS232/RS422 Peripherals
s AppleTalk Peripherals
s Single 5V Systems
DESCRIPTION
The LTC®1318 is a single 5V, RS232/RS422 transceiver
for connection to the DCE, or peripheral side of an interface
link. It includes an on-board charge pump to generate a
±8V supply which allows true RS232 output swings. The
charge pump requires only four external 0.1µF capacitors.
The LTC1318 includes two RS232 drivers, a differential
RS422 driver, a dedicated RS232 receiver, and a pin
selectable RS232/RS422 receiver which can receive either
single-ended or differential signals.
The LTC1318 features driver outputs which can be taken
to common-mode voltages outside the power supply rails
without damage. Additionally, the driver outputs assume
a high impedance state when the power is shut off,
preventing externally applied signals from feeding back
into the power supplies. The RS232 devices will operate at
speeds up to 100kbaud. The RS422 devices will operate
up to 2Mbaud.
The LTC1318 is available in a 24-lead SO Wide package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.
TYPICAL APPLICATIONS
0.1µF
0.1µF
V+
C1+
C1–
CHARGE
PUMP
RS232
LINES
RXI1 RS232
TXO1 RS232
TXO2 RS232
APPLETALK
NETWORK
1k 22Ω
1k 22Ω
22Ω
22Ω
5V VCC
22Ω R X D + RS422
R X D –/RXI2
22Ω T X D +
RS232
T X D – RS422
22Ω
NC
LTC1318
22Ω
LOCALTALK®
TRANSFORMER
100pF × 4
V–
C2–
C 2 + 0.1µF
RXO1
TXI1
TXI2
GND
RXDO/RXO2
TXD
RXMODE
GND
NC
0.1µF
TXD
(5V/DIV)
Driver Output Waveforms
TO
DIGITAL
SYSTEM
TXD+, TXD–
(2V/DIV)
RXDO
(5V/DIV)
RL = 100Ω
CL = 100pF
200ns/DIV
1318 TA02
LT1318 • TA01
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
RS422 Receiver Differential
Threshold vs Temperature
100
VCC = 5V
90
80
INPUT HIGH
70
60
50 INPUT LOW
40
30
20
0 10
20 30 40 50 60 70
TEMPERATURE (°C)
1318 G10
RS232 Receiver Input Threshold
vs Temperature
2.4
VCC = 5V
2.2
INPUT HIGH (RXDO/RXO2)
2.0
1.8 INPUT HIGH (RXO1)
1.6
1.4 INPUT LOW (RXO1)
1.2 INPUT LOW (RXDO/RXO2)
1.0
0.8
0 10
20 30 40 50
TEMPERATURE (°C)
60 70
1318 G11
LTC1318
TTL Output Short-Circuit Current
vs Temperature
24
VCC = 5V
22
RXO1
20
18
RXDO/RXO2
16
14
12
10
0 10 20 30 40 50 60 70
TEMPERATURE (°C)
1318 G12
PIN FUNCTIONS
V+ (Pin 1): Charge Pump Positive Output. This pin re-
quires a 0.1µF capacitor to ground. Under normal opera-
tion this pin maintains a voltage of about 8.8V above
ground. An external load can be connected between this
pin and ground or V–.
C1+, C1– (Pins 2, 3): C1 Inputs. Connect a 0.1µF capacitor
between C1+ and C1–.
RXI1 (Pin 4): First RS232 Single-Ended Receiver Input.
This is an inverting receiver.
TXO1, TXO2 (Pins 5,6): RS232 Single-Ended Driver Out-
puts.
VCC (Pin 7): Positive Supply Input. Apply 4.75V ≤ VCC ≤
5.25V to this pin. A 0.1µF bypass capacitor is required.
RXD+ (Pin 8): When RXMODE (pin 15) is low, this pin acts
as the differential RS422 receiver positive input. When
RXMODE is high, this pin is disabled.
RXD–/RXI2 (Pin 9): When RXMODE (pin 15) is low, this
pin acts as the differential RS422 receiver negative input.
When RXMODE is high, this pin acts as the second RS232
receiver input. The receiver is inverting in RS232 mode.
TXD+ (Pin 10): Differential RS422 Driver Noninverting
Output.
TXD– (Pin 11): Differential RS422 Driver Inverting Output.
NC (Pins 12,13): No Internal Connection.
GND (Pins 14, 18): Power Supply Ground. Connect both
pins to each other and to the ground.
RXMODE (Pin 15): This pin controls the state of the
differential/single-ended receiver. When RXMODE is low,
the receiver is in differential mode and will receive RS422
compatible signals at RXD+ and RXD–/RXI2 (pins 8
and 9). When RXMODE goes high, the receiver enters
single-ended mode and will receive RS232 compatible
signals at RXD–/RXI2. RXD+ is disabled in single-ended
mode. Both modes use the RXDO/RXO2 pin (pin 17) as
their output.
TXD (Pin 16): Differential RS422 Driver Input (TTL Com-
patible).
RXDO/RXO2 (Pin 17):This is the output of the configurable
differential/single-ended receiver.
TXI1, TXI2 (Pins 20, 19): RS232 Driver Inputs (TTL
Compatible). Both are inverting inputs.
RXO1 (Pin 21): First RS232 Receiver Outputs (TTL com-
patible).
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 1318.PDF ] | |
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