LTC1337 データシートの表示（PDF） - Linear Technology
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LTC1337 Datasheet PDF : 8 Pages
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LTC1337
PI FU CTIO S
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in Shutdown
mode or VCC = 0V. The driver outputs are protected against
ESD to ±10kV for human body model discharges.
RX IN: Receiver Inputs. These pins can be forced to ±25V
without damage. The receiver inputs are protected against
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels.
Outputs are in a high impedance state when in Shutdown
mode to allow data line sharing.
UW
W
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
1.4V
DRIVER
OUTPUT
0V
tLHD
1.4V
tHLD
VCC
0V
V+
0V
V–
1337 F01
Figure 1. Driver Propagation Delay Timing
1.7V
RX IN
RX
OUTPUT
0.8V
tLHR
VCC
1.3V
0V
tHLR
VCC
0V
0V
1337 F02
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
DRIVER
INPUT
DRIVER
DRIVER
OUTPUT
51pF 3k
1337 F03
Figure 3. Driver Timing Test Load
RX IN
RX
RX
OUTPUT
51pF
1337 F04
Figure 4. Receiver Timing Test Load
ESD Test Circuit
C1
0.1µF
RS232
LINE PINS
PROTECTED
TO ±10kV
V+ 1
VCC 2
3
C2
0.1µF
4
DRIVER 1 OUT 5
RX1 IN 6
DRIVER 2 OUT 7
RX2 IN 8
RX3 IN 9
10
RX4 IN
11
DRIVER 3 OUT
12
RX5 IN
13
ON/OFF
14
LTC1337
28 V–
27
26
C3
0.1µF
25
DRIVER 1 IN
24
RX1 OUT
23
DRIVER 2 IN
22
RX2 OUT
21
RX3 OUT
20
RX4 OUT
19
DRIVER 3 IN
18
RX5 OUT
17
GND
16
15
C4
0.1µF
1337 TC01
1337fa
5
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