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Linear Technology Electronic Components Datasheet

LT1381 Datasheet

Low Power 5V RS232 Dual Driver/Receiver with 0.1uF Capacitors

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FEATURES
s ESD Protection over ±10kV
s Low Cost
s Uses Small Capacitors: 0.1µF
s CMOS Comparable Low Power: 40mW
s Operates from a Single 5V Supply
s 120kBaud Operation for RL = 3k, CL = 2500pF
s 250kBaud Operation for RL = 3k, CL = 1000pF
s Rugged Bipolar Design
s Outputs Assume a High Impedance State When
Powered Down
s Absolutely No Latchup
s Available in Narrow SO Package
APPLICATI S
s Portable Computers
s Battery-Powered Systems
s Power Supply Generator
s Terminals
s Modems
TYPICAL APPLICATI
+
0.1µF
1
3
+
0.1µF
LOGIC
INPUTS
4
5
11
10
12
LOGIC
OUTPUTS
9
LT1381
16
5V INPUT
2
+
V+ OUT
0.1µF
6 V OUT
+ 0.1µF
14
RS232 OUTPUT
7
13
5k
8
S
5k 15
RS232 OUTPUT
RS232 INPUT
RS232 INPUT
LT1381 • TA01
LT1381
Low Power 5V RS232 Dual
Driver/Receiver with
0.1µF Capacitors
DESCRIPTIO
The LT®1381 is a dual RS232 driver/receiver pair with
integral charge pump to generate RS232 voltage levels
from a single 5V supply. The circuit features rugged
bipolar design to provide operating fault tolerance and
ESD protection unmatched by competing CMOS designs.
Using only 0.1µF external capacitors, the circuit con-
sumes only 40mW of power and can operate to 120kbaud
even while driving heavy capacitive loads. New ESD struc-
tures on the chip allow the LT1381 to survive multiple
±10kV strikes, eliminating the need for costly TransZorbs®
on the RS232 line pins. Driver outputs are protected from
overload and can be shorted to ground or up to ±25V
without damage. During power-off conditions, driver and
receiver outputs are in a high impedance state, allowing
line sharing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb® is a registered trademark of General Instruments, GSI
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
RECEIVER
ROUTPUT
CL = 50pF
INPUT
Output Waveforms
LT1381 • TA02
1


Linear Technology Electronic Components Datasheet

LT1381 Datasheet

Low Power 5V RS232 Dual Driver/Receiver with 0.1uF Capacitors

No Preview Available !

LT1381
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ................................................ 6V
V+ ........................................................................ 13.2V
V...................................................................... –13.2V
Input Voltage
Driver ........................................................... Vto V +
Receiver ............................................... – 30V to 30V
Output Voltage
Driver ................................. (V+ – 30V) to (V + 30V)
Receiver ................................. – 0.3V to (VCC + 0.3V)
Short-Circuit Duration
V+ ................................................................... 30 sec
V................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
LT1381C ................................................. 0°C to 70°C
LT1381I .............................................. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
C1+ 1
V+ 2
C13
C2+ 4
C25
V6
TR2 OUT 7
REC2 IN 8
TOP VIEW
16 VCC
15 GND
14 TR1 OUT
13 REC1 IN
12 REC1 OUT
11 TR1 IN
10 TR2 IN
9 REC2 OUT
N PACKAGE
S PACKAGE
16-LEAD PLASTIC DIP 16-LEAD PLASTIC SOIC
TJMAX = 125°C, θJA = 90°C/ W, θJC = 46°C/W (N)
TJMAX = 125°C, θJA = 110°C/ W, θJC = 34°C/W (S)
ORDER PART
NUMBER
LT1381CN
LT1381CS
LT1381IS
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER
Power Supply Generator
V + Output
V Output
Supply Current (VCC)
CONDITIONS
(Note 3), TA = 25°C
Supply Rise Time
Oscillator Frequency
Driver
Output Voltage Swing
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Data Rate
Slew Rate
Propagation Delay
C1 = C2 = C3 = C4 = 0.1µF
Load = 3k to GND
Positive
Negative
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
0.8V VIN 2.0V
VOUT = 0V
Power Off VOUT = ±15V
RL = 3k, CL = 2500pF
RL = 3k, CL = 1000pF
RL = 3k, CL = 51pF
RL = 3k, CL = 2500pF
Output Transition tHL High to Low (Note 4)
Output Transition tLH Low to High
2
MIN TYP MAX
7.9
– 7.0
8 14
q 16
0.2
130
q 5.0
7.5
q – 6.3 – 5.0
q 1.4 0.8
q 2.0
1.4
q 5 20
9 17
q 10 100
120
250
15 30
46
0.6 1.3
0.5 1.3
UNITS
V
V
mA
mA
ms
kHz
V
V
V
V
µA
mA
µA
kBaud
kBaud
V/µs
V/µs
µs
µs


Part Number LT1381
Description Low Power 5V RS232 Dual Driver/Receiver with 0.1uF Capacitors
Maker Linear Technology
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LT1381 Datasheet PDF






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