LT1332 LINER [Linear Technology], LT1332 Datasheet - Page 5

• Manufacturer Part Number: LT1332
• Description: Wide Supply Range Low Power RS232 Transceiver with 12V VPP Output for Flash Memory
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
TYPICAL PERFOR A CE CHARACTERISTICS
V
accommodate a wide range of logic levels, yet the system
still responds correctly to RS232 signals. Supply current
drops to 40 A in the SHUTDOWN mode. This pin should
be decoupled with a 0.1 F 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 40 A and places all of the drivers and four of the
receivers in a high impedance state. A logic high fully
enables the device.
CC
U
: Input Supply Pin. V
RX OUTPUT
5
4
2
0
3
1
2.0
C
Receiver Input Thresholds
vs Supply Voltage
L
5V/DIV
2V/DIV
= 50pF
INPUT
2.5
U
Receiver Output Waveforms
3.0
SUPPLY VOLTAGE (V)
3.5
4.0
U
V
V
4.5
TH
TH
HIGH
CC
LOW
5.0
LT1332 • TPC10
W
can vary from 2V to 6V to
5.5
6.0
U
2.5
2.0
1.5
1.0
0.5
0
–50
Receiver Input Thresholds
vs Temperature
LT1332 • TPC13
V
CC
–25
= 3V
V
0
TH
TEMPERATURE (°C)
HIGH
25
50
V
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
away from the LT1332.
V
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 Mode
should be relatively large (C 10 F). Low ESR tantalum
Burst Mode
+
–
: Positive Supply Input (RS232 Drivers). V
: Negative Supply Pin (RS232 Drivers). This pin re-
V
C
75
TH
L
= 2500pF
OUTPUT
LOW
10V/DIV
OUTPUT
10V/DIV
DRIVER
DRIVER
R
R
5V/DIV
100 125
TM
INPUT
L
L
= 3k
is a trademark of Linear Technology Corporation
= 3k
LT1332 • TPC11
Driver Output Waveforms
150
TM
0.6
0.4
0.3
0.1
0.5
0.2
0
2.0
Receiver Output Voltage
vs Supply Voltage
regulators, the filter capacitor
RECEIVER
OUTPUT LOW
SINKING 500 A
2.5
+
generator is located far
RECEIVER
OUTPUT LOW
SINKING 250 A
3.0
SUPPLY VOLTAGE (V)
3.5
4.0
LT1332
4.5
OUTPUT HIGH
LT1332 • TPC13
(V
+
SOURCING
RECEIVER
CC
5.0
should
– V
LT1332 • TPC12
OUT
5.5
5
)
6.0