LT1332 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LT1332
Linear Technology
'LT1332' PDF : 8 Pages View PDF
WU
TYPICAL PERFOR A CE CHARACTERISTICS
LT1332
Receiver Input Thresholds
vs Supply Voltage
5
4
VTH HIGH
3
2
VTH LOW
1
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
LT1332 • TPC10
Receiver Output Waveforms
INPUT
5V/DIV
RX OUTPUT
CL = 50pF
2V/DIV
Receiver Input Thresholds
vs Temperature
2.5
VCC = 3V
2.0
VTH HIGH
1.5
VTH LOW
1.0
0.5
Receiver Output Voltage
vs Supply Voltage
0.6
0.5
RECEIVER
OUTPUT LOW
SINKING 500µA
0.4
RECEIVER
OUTPUT LOW
0.3
SINKING 250µA
RECEIVER
OUTPUT HIGH
0.2
(VCC – VOUT)
SOURCING
0.1
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1332 • TPC11
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
LT1332 • TPC12
Driver Output Waveforms
INPUT
5V/DIV
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
10V/DIV
DRIVER
OUTPUT
RL = 3k
10V/DIV
LT1332 • TPC13
LT1332 • TPC13
PI FU CTIO S
VCC: Input Supply Pin. VCC can vary from 2V to 6V to
accommodate a wide range of logic levels, yet the system
still responds correctly to RS232 signals. Supply current
drops to 40µA in the SHUTDOWN mode. This pin should
be decoupled with a 0.1µF ceramic capacitor.
GND: Ground Pins. Pins 13 and 23 (S Package) must both
be grounded for proper operation.
ON/OFF: Controls the operation mode of the device and
is CMOS compatible. A logic low puts the device in the
SHUTDOWN mode which reduces input supply current
to 40µA and places all of the drivers and four of the
receivers in a high impedance state. A logic high fully
enables the device.
V+: Positive Supply Input (RS232 Drivers). V+ should
be greater than 6.5V and less than 13.2V to assure valid
RS232 output signals. An additional decoupling ca-
pacitor may be required if the V + generator is located far
away from the LT1332.
V–: Negative Supply Pin (RS232 Drivers). This pin re-
quires an external capacitor. When the device is powered
from a switching regulator, the filter capacitor should be
selected based on the maximum tolerable ripple for the
specified minimum regulator on time. For some low
frequency Burst ModeTM regulators, the filter capacitor
should be relatively large (C ≥ 10µF). Low ESR tantalum
Burst ModeTM is a trademark of Linear Technology Corporation
5
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