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參數(shù)資料
| 型號： | LTC1318 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single 5V RS232/RS422/AppleTalk DCE Transceiver |
| 中文描述： | 單5V RS232/RS422/AppleTalk DCE的收發(fā)器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LTC1318 |
5
LTC1318
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
TEMPERATURE (
°
C)
0
T
60
1318 G10
20
40
100
90
80
70
60
50
40
30
20
10
30
50
70
INPUT HIGH
INPUT LOW
V
CC
= 5V
TEMPERATURE (
°
C)
0
24
22
20
18
16
14
12
10
30
50
1318 G12
10
20
40
60
70
S
RXO1
V
CC
= 5V
RXDO/RXO2
TEMPERATURE (
°
C)
0
T
60
1318 G11
20
40
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
10
30
50
70
INPUT HIGH (RXDO/RXO2)
INPUT HIGH (RXO1)
INPUT LOW (RXO1)
V
CC
= 5V
INPUT LOW (RXDO/RXO2)
TTL Output Short-Circuit Current
vs Temperature
RS232 Receiver Input Threshold
vs Temperature
V
+
(Pin 1):
Charge Pump Positive Output. This pin re-
quires a 0.1
μ
F 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 0.1
μ
F 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.
V
CC
(Pin 7):
Positive Supply Input. Apply 4.75V
≤
V
CC
≤
5.25V to this pin. A 0.1
μ
F 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.
PI
FU
N
CTIO
N
S
U
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).
RS422 Receiver Differential
Threshold vs Temperature
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