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LT1381CS#PBF

P1-P3P4-P6P7-P8
1
LT1381
Low Power 5V RS232 Dual
Driver/Receiver with
0.1µF Capacitors
R
Output Waveforms
DRIVER
OUTPUT
R
L
= 3k
C
L
= 2500pF
RECEIVER
OUTPUT
C
L
= 50pF
INPUT
U
S
A
O
PP
L
IC
AT
I
■
Portable Computers
■
Battery-Powered Systems
■
Power Supply Generator
■
Terminals
■
Modems
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
D
U
ESCRIPTIO
S
F
EA
T
U
RE
■
ESD Protection over ±10kV
■
Low Cost
■
Uses Small Capacitors: 0.1µF
■
CMOS Comparable Low Power: 40mW
■
Operates from a Single 5V Supply
■
120kBaud Operation for R
L
= 3k, C
L
= 2500pF
■
250kBaud Operation for R
L
= 3k, C
L
= 1000pF
■
Rugged Bipolar Design
■
Outputs Assume a High Impedance State When
Powered Down
■
Absolutely No Latchup
■
Available in Narrow SO Package
5k
5k
0.1µF
LOGIC
INPUTS
LOGIC
OUTPUTS
9
12
10
11
5
4
3
1
15
8
13
7
14
6
2
16
5V INPUT
V
+
OUT
V
–
OUT
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
RS232 INPUT
LT1381 • TA01
LT1381
0.1µF
0.1µF
0.1µF
+
+
+
+
S
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb
®
is a registered trademark of General Instruments, GSI
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.
LT1381 • TA02
2
LT1381
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
(Note 1)
Supply Voltage (V
CC
) ................................................ 6V
V
+
........................................................................ 13.2V
V
–
...................................................................... –13.2V
Input Voltage
Driver ........................................................... V
–
to V
+
Receiver ............................................... – 30V to 30V
Output Voltage
Driver ................................. (V
+
– 30V) to (V
–
+ 30V)
Receiver ................................. –0.3V to (V
CC
+ 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
ORDER PART
NUMBER
LT1381CN
LT1381CS
LT1381IS
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
C1
+
V
+
C1
–
C2
+
C2
–
V
–
TR2 OUT
REC2 IN
V
CC
GND
TR1 OUT
REC1 IN
REC1 OUT
TR1 IN
TR2 IN
REC2 OUT
N PACKAGE
16-LEAD PLASTIC DIP
S PACKAGE
16-LEAD PLASTIC SOIC
T
JMAX
= 125°C, θ
JA
= 90°C/W, θ
JC
= 46°C/W (N)
T
JMAX
= 125°C, θ
JA
= 110°C/ W, θ
JC
= 34°C/W (S)
Consult factory for Military grade parts.
(Note 2)
E
LECTR
IC
AL C CHARA TERIST
ICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Generator
V
+
Output 7.9 V
V
–
Output –7.0 V
Supply Current (V
CC
) (Note 3), T
A
= 25°C814mA
● 16 mA
Supply Rise Time C1 = C2 = C3 = C4 = 0.1µF 0.2 ms
Oscillator Frequency 130 kHz
Driver
Output Voltage Swing Load = 3k to GND Positive
● 5.0 7.5 V
Negative ● –6.3 –5.0 V
Logic Input Voltage Level Input Low Level (V
OUT
= High) ● 1.4 0.8 V
Input High Level (V
OUT
= Low) ● 2.0 1.4 V
Logic Input Current 0.8V ≤ V
IN
≤ 2.0V ● 520 µA
Output Short-Circuit Current V
OUT
= 0V 9 17 mA
Output Leakage Current Power Off V
OUT
= ±15V ● 10 100 µA
Data Rate R
L
= 3k, C
L
= 2500pF 120 kBaud
R
L
= 3k, C
L
= 1000pF 250 kBaud
Slew Rate R
L
= 3k, C
L
= 51pF 15 30 V/µs
R
L
= 3k, C
L
= 2500pF 4 6 V/µs
Propagation Delay Output Transition t
HL
High to Low (Note 4) 0.6 1.3 µs
Output Transition t
LH
Low to High 0.5 1.3 µs
3
LT1381
PARAMETER CONDITIONS MIN TYP MAX UNITS
Receiver
Input Voltage Thresholds Input Low Threshold (V
OUT
= High) 0.8 1.3 V
Input High Threshold (V
OUT
= Low) 1.7 2.4 V
Hysteresis ● 0.1 0.4 1.0 V
Input Resistance (Note 6) 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= –1.6mA ● 0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 5V) ● 3.5 4.2 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–10 mA
Sourcing Current, V
OUT
= 0V 10 20 mA
Propagation Delay Output Transition t
HL
High-to-Low (Note 5) 250 600 ns
Output Transition t
LH
Low-to-High 350 600 ns
E
LECTR
IC
AL C CHARA TERIST
ICS
(Note 2)
TYPICAL PERFOR A CE CHARACTERISTICS
WU
Driver Maximum Output Voltage
vs Load Capacitance
TEMPERATURE (°C)
–55
–10
DRIVER OUTPUT VOLTAGE (V)
–8
–4
–2
0
10
4
0
50
75
LT1381 • TPC03
–6
6
8
2
–25
25
100
125
R
L
= 3k
V
CC
= 5.5V
V
CC
= 5V
V
CC
= 4.5V
V
CC
= 4.5V
V
CC
= 5V
V
CC
= 5.5V
OUTPUT HIGH
OUTPUT LOW
Driver Minimum Output Voltage
vs Load Capacitance Driver Output Voltage
Note 4: For driver delay measurements, R
L
= 3k and C
L
= 51pF. Trigger
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t
HL
= 1.4V to 0V and t
LH
= 1.4V to 0V).
Note 5: For receiver delay measurements, C
L
= 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition
to standard TTL/CMOS logic threshold (t
HL
= 1.3V to 2.4V and t
LH
= 1.7V
to 0.8V).
Note 6: Tested at V
IN
= ±10V.
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Testing done at V
CC
= 5V, unless otherwise specified.
Note 3: Supply current is measured as the average over several charge
pump cycles. C
+
= C
–
= C1 = C2 = 0.1µF. All outputs are open, with all
driver inputs tied high.
–20
LOAD CAPACITANCE (nF)
–7.0
PEAK OUTPUT VOLTAGE (V)
–6.0
–5.0
–4.0
2468
LT1381 • TPC02
1013579
–5.5
–4.5
–6.5
0
2 DRIVERS LOADED
120k BAUD
60k BAUD
20k BAUD
LOAD CAPACITANCE (nF)
0
PEAK OUTPUT VOLTAGE (V)
8.0
9.0
8
LT1381 • TPC01
7.0
6.0
5.0
2
4
6
10
7.5
8.5
6.5
5.5
7
1
3
5
9
2 DRIVERS LOADED
20k BAUD
60k BAUD
120k BAUD
P1-P3P4-P6P7-P8

LT1381CS#PBF

Mfr. #:
Buy LT1381CS#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC RS232 2Dx/2Rx in Narrow SOIC
Lifecycle:
New from this manufacturer.
Delivery:
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