LT1381IS#TR [Linear]
LT1381 - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors; Package: SO; Pins: 16; Temperature Range: -40°C to 85°C;
| 型号： | LT1381IS#TR |
| 厂家： | 
Linear |
| 描述： | LT1381 - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors; Package: SO; Pins: 16; Temperature Range: -40°C to 85°C 驱动器 电容器 |
| 文件： | 总8页 (文件大小：188K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1381
Low Power 5V RS232 Dual
Driver/Receiver with
0.1µF Capacitors
U
DESCRIPTIO
EATURE
S
F
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
±10kVstrikes,eliminatingtheneedforcostlyTransZorbs®
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.
■
■
■
■
■
■
■
■
■
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 RL = 3k, CL = 2500pF
250kBaud Operation for RL = 3k, CL = 1000pF
Rugged Bipolar Design
Outputs Assume a High Impedance State When
Powered Down
Absolutely No Latchup
Available in Narrow SO Package
■
■
O U
PPLICATI
S
A
■
■
■
■
■
Portable Computers
Battery-Powered Systems
Power Supply Generator
Terminals
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb® is a registered trademark of General Instruments, GSI
Modems
U
O
TYPICAL APPLICATI
1
16
5V INPUT
+
+
Output Waveforms
0.1µF
3
2
V
OUT
+
+
DRIVER
OUTPUT
RL = 3k
0.1µF
0.1µF
LT1381
4
6
–
C
L = 2500pF
V
OUT
+
0.1µF
5
11
14
RECEIVER
RS232 OUTPUT
OUTPUT
R
LOGIC
INPUTS
CL = 50pF
10
12
7
RS232 OUTPUT
RS232 INPUT
13
INPUT
5k
5k
LOGIC
OUTPUTS
9
8
S
RS232 INPUT
LT1381 • TA02
15
LT1381 • TA01
1
LT1381
W W W
U
W
U
ABSOLUTE AXI U RATI GS
/
PACKAGE ORDER I FOR ATIO
(Note 1)
ORDER PART
Supply Voltage (VCC) ................................................ 6V
V+ ........................................................................ 13.2V
V– ...................................................................... –13.2V
Input Voltage
TOP VIEW
NUMBER
+
1
2
3
4
5
6
7
8
V
CC
16
15
14
13
12
11
10
9
C1
V
+
–
+
–
–
GND
LT1381CN
LT1381CS
LT1381IS
TR1 OUT
REC1 IN
REC1 OUT
TR1 IN
C1
C2
C2
V
Driver ........................................................... V– to V+
Receiver ............................................... – 30V to 30V
Output Voltage
Driver ................................. (V+ – 30V) to (V– + 30V)
Receiver ................................. – 0.3V to (VCC + 0.3V)
Short-Circuit Duration
TR2 IN
TR2 OUT
REC2 IN
REC2 OUT
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
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)
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
Consult factory for Military grade parts.
(Note 2)
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
+
V
V
Output
Output
7.9
–7.0
8
V
V
mA
mA
ms
–
Supply Current (V
)
(Note 3), T = 25°C
14
16
CC
A
●
Supply Rise Time
C1 = C2 = C3 = C4 = 0.1µF
0.2
Oscillator Frequency
Driver
130
kHz
Output Voltage Swing
Load = 3k to GND
Positive
Negative
●
●
5.0
7.5
V
V
V
V
–6.3
–5.0
0.8
Logic Input Voltage Level
Input Low Level (V
Input High Level (V
= High)
= Low)
●
●
1.4
1.4
OUT
OUT
2.0
9
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Data Rate
0.8V ≤ V ≤ 2.0V
●
5
20
µA
mA
µA
IN
V
= 0V
17
10
OUT
Power Off V
= ±15V
●
100
OUT
R = 3k, C = 2500pF
120
250
kBaud
kBaud
L
L
L
L
R = 3k, C = 1000pF
Slew Rate
R = 3k, C = 51pF
15
6
30
V/µs
V/µs
L
L
R = 3k, C = 2500pF
4
L
L
Propagation Delay
Output Transition t High to Low (Note 4)
0.6
0.5
1.3
1.3
µs
µs
HL
Output Transition t Low to High
LH
2
LT1381
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Receiver
Input Voltage Thresholds
Input Low Threshold (V
= High)
= Low)
0.8
1.3
1.7
V
V
OUT
OUT
Input High Threshold (V
2.4
1.0
7
Hysteresis
●
0.1
3
0.4
5
V
Input Resistance
Output Voltage
(Note 6)
kΩ
Output Low, I
= –1.6mA
= 160µA (V = 5V)
●
●
0.2
4.2
0.4
V
V
OUT
OUT
Output High, I
3.5
10
CC
Output Short-Circuit Current
Propagation Delay
Sinking Current, V
= V
OUT
–20
20
–10
mA
mA
OUT
CC
= 0V
Sourcing Current, V
Output Transition t High-to-Low (Note 5)
250
350
600
600
ns
ns
HL
Output Transition t Low-to-High
LH
The
●
denotes specifications which apply over the full operating
Note 4: For driver delay measurements, R = 3k and C = 51pF. Trigger
L L
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t = 1.4V to 0V and t = 1.4V to 0V).
HL
LH
of the device may be impaired.
Note 5: For receiver delay measurements, C = 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition
L
Note 2: Testing done at V = 5V, unless otherwise specified.
CC
to standard TTL/CMOS logic threshold (t = 1.3V to 2.4V and t = 1.7V
HL
LH
Note 3: Supply current is measured as the average over several charge
to 0.8V).
+
–
pump cycles. C = C = C1 = C2 = 0.1µF. All outputs are open, with all
Note 6: Tested at V = ±10V.
IN
driver inputs tied high.
W U
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Maximum Output Voltage
vs Load Capacitance
Driver Minimum Output Voltage
vs Load Capacitance
Driver Output Voltage
10
8
–4.0
–4.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
R
= 3k
L
2 DRIVERS LOADED
2 DRIVERS LOADED
120k BAUD
6
V
V
= 5.5V
CC
= 4.5V
CC
V
= 5V
4
–5.0
–5.5
–6.0
–6.5
–7.0
CC
2
60k BAUD
20k BAUD
OUTPUT HIGH
20k BAUD
60k BAUD
0
OUTPUT LOW
–2
–4
–6
–8
–10
V
V
= 4.5V
= 5V
CC
V
CC
CC
= 5.5V
120k BAUD
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
–55
0
25
50
75 100 125
–25
LOAD CAPACITANCE (nF)
TEMPERATURE (°C)
LOAD CAPACITANCE (nF)
LT1381 • TPC01
LT1381 • TPC02
LT1381 • TPC03
3
LT1381
TYPICAL PERFOR A CE CHARACTERISTICS
W U
Receiver Input Threshold
Supply Current vs Data Rate
Driver Leakage in Shutdown
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
50
40
30
20
100
10
1
2 DRIVERS ACTIVE
R
C
= 3k
= 2500pF
L
L
INPUT HIGH
INPUT LOW
V
= 30V
OUT
V
= –30V
OUT
10
0
0.1
–55
0
25
50
75 100 125
0
50
75
100
125
150
–25
25
–55
0
25
50
75 100 125
–25
TEMPERATURE (°C)
DATA RATE (kBaud)
TEMPERATURE (°C)
LT1381 • TPC04
LT1381 • TPC05
LT1381 • TPC06
Receiver Short-Circuit Current
Driver Short-Circuit Current
Slew Rate vs Load Capacitance
50
40
30
20
10
0
30
25
20
15
20
18
16
14
12
10
8
–
ISC
+
ISC
+
ISC
–
ISC
+SLEW RATE
–SLEW RATE
10
5
6
4
2
0
0
–55
0
25
50
75 100 125
–25
50
TEMPERATURE (˚C)
100 125
–55 –25
0
25
75
0
1
2
3
4
5
TEMPERATURE (°C)
CAPACITANCE (nF)
LTLT1381 • TPC07
LT1381 • TPC08
LT1381 • TPC09
V+ Compliance Curve
V– Compliance Curve
10
8
–10
–8
–6
–4
+
V
(1µF)
–
+
V
(1µF)
V
(0.1µF)
6
–
V
(0.1µF)
4
2
0
–2
0
0
5
10
15
0
5
10
15
+
–
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LT1381 • TPC10
LT1381 • TPC11
4
LT1381
U
U
U
PI FU CTIO S
C1+, C1–, C2+, C2– (Pins 1, 3, 4, 5): Commutating
Capacitor Inputs. These pins require two external capaci-
tors C ≥ 0.1µF: one from C1+ to C1– and another from C2+
to C2–. C1 may be deleted if a separate 12V supply is
available and connected to pin C1+.
V+ (Pin 2): Positive Supply Output (RS232 Drivers).
V+ ≈ 2VCC – 2.1V. This pin requires an external charge
storage capacitor C ≥ 0.1µF, tied to ground or VCC. Larger
valuecapacitorsmaybeusedtoreducesupplyripple.With
multipletransceivers,theV+ andV– pinsmaybeparalleled
into common capacitors.
V– (Pin 6): Negative Supply Output (RS232 Drivers).
V– ≈ –(2VCC – 3V). This pin requires an external charge
storage capacitor C ≥ 0.1µF. Larger value capacitors may
be used to reduce supply ripple. With multiple transceiv-
ers, the V+ and V– pins may be paralleled into common
capacitors.
higher voltages will not damage the device if the over-
drive is moderately current limited. Short circuits on one
output can load the power supply generator and may
disrupt the signal levels of the other outputs. The driver
outputs are protected against ESD to ±10kV for human
body model discharges.
REC2 IN, REC1 IN (Pins 8, 13): Receiver Inputs. These
pinsacceptRS232levelsignals(±30V)intoaprotected5k
terminating resistor. The receiver inputs are protected
against ESD to ±10kV for human body model discharges.
Each receiver provides 0.4V of hysteresis for noise immu-
nity. Open receiver inputs assume a logic low state.
REC2OUT, REC1OUT(Pins9, 12):ReceiverOutputswith
TTL/CMOS Voltage Levels. Outputs are fully short-circuit
protected to ground or VCC with the power ON or OFF.
TR2 IN, TR1 IN (Pins 10, 11): RS232 Driver Input Pins.
These inputs are TTL/CMOS compatible. Inputs should
not be allowed to float. Tie unused inputs to VCC.
TR2 OUT, TR1 OUT (Pin 7, 14): Driver Outputs at RS232
Voltage Levels. Driver output swing meets RS232 levels
for loads up to 3k. Slew rates are controlled for lightly
loaded lines. Output current capability is sufficient for
load conditions up to 2500pF. Outputs are in a high
impedance state when VCC = 0V. Outputs are fully short-
circuit protected from V– + 25V to V+ – 25V. Applying
GND (Pin 15): Ground Pin.
VCC (Pin 16): 5V Input Supply Pin. This pin should be
decoupled with a 0.1µF ceramic capacitor close to the
package pin. Insufficient supply bypassing can result in
lowoutputdrivelevelsanderraticchargepumpoperation.
U
ESD PROTECTIO
ESD Test Circuit
The RS232 line inputs of the LT1381 have on-chip protec-
tion from ESD transients up to ±10kV. The protection
structures act to divert the static discharge safely to
systemground. InorderfortheESDprotectiontofunction
effectively, thepowersupplyandgroundpinsofthecircuit
must be connected to ground through low impedances.
Thepowersupplydecouplingcapacitorsandchargepump
storage capacitors provide this low impedance in normal
application of the circuit. The only constraint is that low
ESR capacitors must be used for bypassing and charge
storage. ESD testing must be done with pins VCC, V+, V–
and GND shorted to ground or connected with low ESR
capacitors.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
+
5V V
C1
CC
0.1µF
+
+
+
LT1381
+
0.1µF
+
0.1µF
V
GND
TR1 OUT
–
+
–
C1
C2
C2
RS232
LINE PINS
REC1 IN
PROTECTED
TO ±10kV
0.1µF
0.1µF
REC1 OUT
TR1 IN
TR2 IN
+
–
V
TR2 OUT
REC2 IN
RS232
LINE PINS
PROTECTED
TO ±10kV
REC2 OUT
LT1381 • ESD TC
5
LT1381
TYPICAL APPLICATIO S
U
Isolated RS232 Driver/Receiver
1N5818
CTX20-1
1:1
V
= 5V
1Ω
IN
±10% FROM
5V ±10%
LT1121-5
SYSTEM
+
+
L1
47Ω
0.1µF
100µF
10µF
20µH
I
V
1N5818
+
LIM
IN
SW1
LT1111
13.7V
100µF
10k
+
FB
SW2
1µF
GND
1k
V
1
16
2
CC
V
CC
V
+
+
OUT
ISOLATOR OUTPUT
(DATA TO SYSTEM)
LT1381
RS232
OS
IN
0.1µF
3
LTC1145
+
4
0.1µF
0.1µF
GND2
GND1
0.1µF
5
6
8
+
9
V
CC
OS
RS232 INPUT
R
X
V
IN
ISOLATOR INPUT
(DATA FROM SYSTEM)
IN
LTC1145
11
14
15
D
X
RS232 OUTPUT
GND1
GND2
FLOATING GROUND
SYSTEM GROUND
LT1381 • TA03
ISOLATION BARRIER
Data Transmission Across Isolation Barrier
ISOLATOR
INPUT
RS232
INPUT
RS232
OUTPUT
ISOLATOR
OUTPUT
1381 TA04
1381 TA05
6
LT1381
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
N Package
16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
14
12
10
9
8
15
13
11
16
0.255 ± 0.015*
(6.477 ± 0.381)
2
1
3
4
6
5
7
0.300 – 0.325
0.130 ± 0.005
0.045 – 0.065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
0.020
(0.508)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
–0.015
0.325
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.100 ± 0.010
(2.540 ± 0.254)
+0.889
8.255
(
)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N16 1197
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
16
15
14
13
12
11
10
9
0.150 – 0.157**
0.228 – 0.244
(3.810 – 3.988)
(5.791 – 6.197)
5
7
8
1
2
3
4
6
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
0.016 – 0.050
0.406 – 1.270
S16 0695
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
7
LT1381
TYPICAL APPLICATIO S
U
Operation Using 5V and 12V Power Supplies
1
2
4
16
3
12V INPUT
5V INPUT
LT1381
16
–12V
OUT
+
0.1µF
0.1µF
+
5
11
14
7
RS232 OUTPUT
RS232 OUTPUT
RS232 INPUT
LOGIC
INPUTS
10
12
13
5k
5k
LOGIC
OUTPUTS
9
8
S
RS232 INPUT
15
LT1381 • TA06
Sharing Capacitors
16
11
2
6
16
2
6
+
–
+
–
5V V
CC
V
V
5V V
CC
V
V
LT1381
LT1381
+
14
0.1µF
11
14
+
RS232 OUTPUT
TTL INPUT
TTL INPUT
RS232 OUTPUT
TTL INPUT
TTL INPUT
10
12
7
10
12
7
RS232 OUTPUT
RS232 INPUT
RS232 OUTPUT
RS232 INPUT
13
13
TTL OUTPUT
TTL OUTPUT
5k
5k
5k
5k
9
8
9
8
TTL OUTPUT
RS232 INPUT
TTL OUTPUT
RS232 INPUT
1
3
4
5
1
3
4
5
+
+
+
+
C1
C2
C2
C1
C2
C2
+
+
+
+
0.1µF
0.1µF
0.1µF
0.1µF
–
–
–
–
C1
C1
LT1381 • TA07
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1180A/LT1181A
LT1280A/LT1281A
LT1780/LT1781
5V 2-Driver/2-Receiver RS232 Transceivers
5V 2-Driver/2-Receiver RS232 Transceivers
5V 2-Driver/2-Receiver RS232 Transceivers
Pin Compatible with LT1280A/LT1280A
Pin Compatible with LT1180A/LT1181A
IEC 1000-4-2 Level 4 Compliance
1381fa, sn1381 LT/TP 1098 REV A 2K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
LINEAR TECHNOLOGY CORPORATION 1993
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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