LT1281AISW#PBF [Linear]
LT1281A - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors; Package: SO; Pins: 16; Temperature Range: -40°C to 85°C;
| 型号： | LT1281AISW#PBF |
| 厂家： | 
Linear |
| 描述： | LT1281A - 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：254K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1280A/LT1281A
Low Power 5V RS232
Dual Driver/Receiver with
0.1µF Capacitors
U
DESCRIPTIO
EATURE
S
F
The LT®1280A/LT1281A are dual RS232 driver/receiver
pairs with integral charge pump to generate RS232 volt-
age levels from a single 5V supply. These circuits feature
rugged bipolar design to provide operating fault tolerance
and ESD protection unmatched by competing CMOS
designs. Using only 0.1µF external capacitors, these cir-
cuits consume only 40mW of power, and can operate to
120kbaud even while driving heavy capacitive loads. New
ESDstructuresonthechipallowtheLT1280A/LT1281Ato
survive multiple ±10kV strikes, eliminating the need for
costly TransZorbs® on the RS232 line pins. The LT1280A/
LT1281A are fully compliant with EIA RS232 standards.
Driver outputs are protected from overload, and can be
shorted to ground or up to ±30V without damage. During
shutdown or power-off conditions, driver and receiver
outputs are in a high impedance state, allowing line
sharing.
■
■
■
■
■
■
■
■
■
■
10mA Max Supply Current
ESD Protection over ±10kV
Uses Small Capacitors: 0.1µF
120kBaud Operation for RL = 3k, CL = 2500pF
250kBaud Operation for RL = 3k, CL = 1000pF
Outputs Withstand ±30V Without Damage
CMOS Comparable Low Power: 40mW
Operates from a Single 5V Supply
Rugged Bipolar Design
Outputs Assume a High Impedance State When Off
or Powered Down
■
■
■
■
Meets All RS232 Specifications
Available With or Without Shutdown
Absolutely No Latch-up
Available in SO Package
O U
PPLICATI
S
A
The LT1281A is available in 16-pin DIP and SO packages.
The LT1280A is supplied in 18-pin DIP and SO packages
for applications which require shutdown.
■
■
■
■
■
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
2
17
5V INPUT
+
+
Output Waveforms
0.1µF
0.1µF
4
3
V
OUT
+
+
0.1µF
0.1µF
LT1280A
DRIVER
OUTPUT
5
7
–
V
OUT
+
R
L = 3k
C
L = 2500pF
6
12
15
RS232 OUTPUT
RECEIVER
LOGIC
INPUTS
OUTPUT
R
11
13
8
CL = 50pF
RS232 OUTPUT
RS232 INPUT
14
INPUT
5k
5k
LOGIC
OUTPUTS
10
18
9
RS232 INPUT
LT1280A • TA02
16
ON/OFF
LT1280A • TA01
1
LT1280A/LT1281A
W W W
U
(Note 1)
ABSOLUTE AXI U RATI GS
Short-Circuit Duration
Supply Voltage (VCC) ................................................ 6V
V+ ........................................................................ 13.2V
V– ...................................................................... –13.2V
Input Voltage
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
Driver ........................................................... V– to V+
Receiver ............................................... – 30V to 30V
ON/OFF ................................................. –0.3V to 12V
Output Voltage
LT1280AC/LT1281AC ............................. 0°C to 70°C
LT1280AI/LT1281AI .......................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Driver ...................................... V+ – 30V to V– + 30V
Receiver .................................... – 0.3V to VCC + 0.3V
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
TOP VIEW
ORDER PART
NUMBER
ORDER PART
+
1
2
3
4
5
6
7
8
9
ON/OFF
18
17
16
15
14
13
12
11
10
NC
+
C1
V
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NUMBER
+
–
+
–
–
V
CC
C1
GND
+
–
+
–
–
GND
V
C1
C2
C2
V
C1
C2
C2
V
TR1 OUT
REC1 IN
REC1 OUT
TR1 IN
TR1 OUT
REC1 IN
REC1 OUT
TR1 IN
LT1280ACN
LT1280AIN
LT1280ACSW
LT1280AISW
LT1281ACN
LT1281AIN
LT1281ACSW
LT1281AISW
TR2 OUT
REC2 IN
TR2 IN
TR2 IN
TR2 OUT
REC2 IN
REC2 OUT
REC2 OUT
N PACKAGE 16-LEAD PDIP
SW PACKAGE
N PACKAGE 18-LEAD PDIP
SW PACKAGE
18-LEAD PLASTIC SO WIDE
16-LEAD PLASTIC SO WIDE
TJMAX = 125°C, θJA = 90°C/ W, θJC = 46°C/W (N)
JMAX = 125°C, θJA = 95°C/ W, θJC = 27°C/W (SW)
TJMAX = 125°C, θJA = 80°C/ W, θJC = 36°C/W (N)
JMAX = 125°C, θJA = 90°C/ W, θJC = 26°C/W (SW)
T
T
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
–
Supply Current (V
)
(Note 3), T = 25°C
10
14
10
CC
A
●
●
Supply Current When OFF (V
)
Shutdown (Note 4) LT1280A Only
1
µA
CC
Supply Rise Time
Shutdown to Turn-On
C1 = C2 = C3 = C4 = 0.1µF
LT1280A Only
0.2
0.2
ms
ms
ON/OFF Pin Thresholds
Input Low Level (Device Shutdown)
Input High Level (Device Enabled)
●
●
0.8
1.2
1.6
V
V
µA
2.4
80
ON/OFF Pin Current
Oscillator Frequency
Driver
0V ≤ V
≤ 5V
●
–15
ON/OFF
130
kHz
Output Voltage Swing
Load = 3k to GND
Input Low Level (V
Positive
Negative
●
●
5.0
2.0
7.5
V
V
–6.3
–5.0
0.8
Logic Input Voltage Level
= High)
= Low)
●
●
1.4
1.4
V
V
OUT
OUT
Input High Level (V
2
LT1280A/LT1281A
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER
CONDITIONS
0.8V ≤ V ≤ 2.0V
MIN
TYP
5
MAX
UNITS
µA
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Data Rate (Note 7)
●
●
20
IN
V
= 0V
±9
17
10
mA
OUT
Shutdown V
= ±30V (Note 4)
100
µA
OUT
R = 3k, C = 2500pF
120
250
kBaud
kBaud
L
L
R = 3k, C = 1000pF
L
L
Slew Rate
R = 3k, C = 51pF
15
7
30
V/µs
V/µs
L
L
R = 3k, C = 2500pF
4
L
L
Propagation Delay
Output Transition t High-to-Low (Note 5)
0.6
0.5
1.3
1.3
µs
µs
HL
Output Transition t Low-to-High
LH
Receiver
Input Voltage Thresholds
Input Low Threshold (V
= High)
= Low)
C Grade
C Grade
●
●
0.8
0.2
1.3
1.7
V
V
OUT
OUT
Input High Threshold (V
2.4
Input Low
Input High
I Grade
I Grade
●
●
1.3
1.7
V
V
3.0
1.0
7
Hysteresis
●
0.1
3
0.4
5
V
kΩ
µA
Input Resistance
Output Leakage Current
Output Voltage
V
= ±10V
IN
Shutdown (Note 4) 0 ≤ V
≤ V
●
1
10
0.4
OUT
CC
Output Low, I
= –1.6mA
= 160µA (V = 5V)
●
●
0.2
4.2
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 6)
250
350
600
600
ns
ns
HL
Output Transition t Low-to-High
LH
The
●
denotes specifications which apply over the operating temperature
Note 4: Supply current measurements in shutdown are performed with
V ≤ 0.1V.
ON/OFF
range (0°C ≤ T ≤ 70°C for commercial grade, and –40°C ≤ T ≤ 85°C for
A
A
industrial grade.
Note 5: For driver delay measurements, R = 3k and C = 51pF. Trigger
L
L
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
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
Note 2: Testing done at V = 5V and V
= 3V, unless otherwise
Note 6: For receiver delay measurements, C = 51pF. Trigger points are
CC
ON/OFF
L
specified.
set between the receiver’s input logic threshold and the output transition
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
driver inputs tied high.
Note 7: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Maximum Output Voltage
vs Load Capacitance
Driver Minimum Output Voltage
vs Load Capacitance
Driver Output Voltage
10
8
8.0
7.5
–4.0
–4.5
R
= 3k
L
6
V
V
= 5.5V
CC
120k BAUD
V
= 5V
CC
4
7.0
6.5
–5.0
–5.5
= 4.5V
CC
20k BAUD
60k BAUD
120k BAUD
2
OUTPUT HIGH
60k BAUD
20k BAUD
0
OUTPUT LOW
–2
–4
–6
–8
–10
V
V
= 4.5V
= 5V
CC
V
CC
6.0
5.5
5.0
–6.0
–6.5
–7.0
CC
= 5.5V
0
1
2
3
4
5
6
7
8
9
10
–55
–25
0
25
50
75 100 125
0
1
2
3
4
5
6
7
8
9
10
LOAD CAPACITANCE (nF)
TEMPERATURE (°C)
LOAD CAPACITANCE (nF)
LT1280A • TPC01
LT1280A • TPC03
LT1280A • TPC02
3
LT1280A/LT1281A
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Receiver Input Thresholds
Supply Current vs Data Rate
ON/OFF Thresholds
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
3.0
2.5
2.0
1.5
2 DRIVERS ACTIVE
R
= 3k
= 2500pF
L
L
C
INPUT HIGH
INPUT LOW
ON THRESHOLD
1.0
0.5
0
OFF THRESHOLD
10
0
–55
0
25
50
75 100 125
0
50
75
100
125
150
–25
25
50
TEMPERATURE (°C)
100 125
–55 –25
0
25
75
TEMPERATURE (°C)
DATA RATE (kBAUD)
LT1280A • TPC04
LT1280A • TPC05
LT1280A • TPC06
Driver Leakage in Shutdown
Supply Current
Driver Short-Circuit Current
25
20
15
10
5
30
25
20
15
100
10
1
2 DRIVERS LOADED R = 3k
+
L
I
SC
1 DRIVER LOADED R = 3k
L
–
I
SC
V
= 30V
OUT
10
5
V
= –30V
OUT
NO LOAD
0
0
0.1
–55
0
25
50
75 100 125
–55 –25
0
25
50
75
100 125
–25
–55
0
25
50
75 100 125
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1280A • TPC07
LT1280A • TPC09
LT1280A • TPC08
Receiver Short-Circuit Current
Slew Rate vs Load Capacitance
50
40
30
20
10
0
16
14
12
10
8
–
RX I
+
SC
RX I
SC
+SLEW
–SLEW
6
4
2
0
–55
0
25
50
75 100 125
–25
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
LOAD CAPACITANCE (nF)
LT1280A • TPC11
TEMPERATURE (°C)
LT1280A • TPC10
4
LT1280A/LT1281A
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Waveforms
Shutdown to Driver Outputs
10V
DRIVER 1
OUTPUT
5V
GND
GND
DRIVER OUTPUT
L = 3k
L = 2500pF
R
C
DRIVER 2
OUTPUT
–5V
DRIVER OUTPUT
L = 3k
–10V
R
ON/OFF PIN
INPUT
LT1280A • TPC13
LT1280A • TPC12
U
U
U
PI FU CTIO S
VCC: 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 low output
drive levels and erratic charge pump operation.
Output current capability is sufficient for load conditions
upto2500pF.Outputsareinahighimpedancestatewhen
in shutdown mode or VCC = 0V. Outputs are fully short-
circuit protected from V– + 30V to V+ – 30V. Applying
highervoltageswillnotdamagethedeviceiftheoverdrive
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.
GND: Ground Pin.
ON/OFF: A TTL/CMOS Compatible Operating Mode Con-
trol. A logic low puts the LT1280A in shutdown mode.
Supply current drops to zero and both driver and receiver
outputs assume a high impedance state. A logic high fully
enables the device.
REC1 IN, REC2 IN: Receiver Inputs. These pins accept
RS232 level signals (±30V) into a protected 5k terminat-
ing resistor. The receiverinputs are protected againstESD
to±10kVforhumanbodymodeldischarges.Eachreceiver
provides 0.4V of hysteresis for noise immunity. Open
receiver inputs assume a logic low state.
V+: Positive Supply Output (RS232 Drivers). V+ ≈ 2VCC
–
1.5V. This pin requires an external charge storage capaci-
tor C ≥ 0.1µF, tied to ground or VCC. Larger value capaci-
tors may be used to reduce supply ripple. With multiple
transceivers, the V+ and V– pins may be paralleled into
common capacitors.
V–: Negative Supply Output (RS232 Drivers). V– ≈ –
(2VCC –2.5V).Thispinrequiresanexternalchargestorage
capacitor C ≥ 0.1µF. Larger value capacitors may be used
to reduce supply ripple. With multiple transceivers, the V+
and V– pins may be paralleled into common capacitors.
REC1 OUT, REC2 OUT: Receiver outputs with TTL/CMOS
Voltage Levels. Outputs are in a high impedance state
when in shutdown mode to allow data line sharing. Out-
puts are fully short-circuit protected to ground or VCC with
the power ON, OFF or in the shutdown mode.
C1+, C1–, C2+, C2–: Commutating Capacitor Inputs.
These pins require two external capacitors C ≥ 0.1µF: one
from C1+ to C1– and another from C2+ to C2–. C1 should
be deleted if a separate 12V supply is available and
connected to pin C1+. Similarly, C2 should be deleted if a
separate –12V supply is connected to pin V–.
TR1IN, TR2IN:RS232DriverInputPins. Theseinputsare
TTL/CMOS compatible. Inputs should not be allowed to
float. Tie unused inputs to VCC.
TR1 OUT, TR2 OUT: 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.
5
LT1280A/LT1281A
U
ESD PROTECTIO
ESD Test Circuit
The RS232 line inputs of the LT1280A/LT1281A have on-
chip protection from ESD transients up to ±10kV. The
protection structures act to divert the static discharge
safelytosystemground. InorderfortheESDprotectionto
function effectively, the power supply and ground pins of
the circuit must be connected to ground through low
impedances.Thepowersupplydecouplingcapacitorsand
charge pump storage capacitors provide this low imped-
ance in normal application of the circuit. The only con-
straint is that low ESR capacitors must be used for
bypassing and charge storage. ESD testing must be done
with pins VCC, VL, V+, V–, and GND shorted to ground or
connected with low ESR capacitors.
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
NC
ON/OFF
LT1280A
+
5V V
C1
CC
0.1µF
+
+
+
+
0.1µF
+
0.1µF
0.1µF
V
GND
DR1 OUT
–
+
C1
RS232
LINE PINS
PROTECTED
TO ±10kV
RX1 IN
RX1 OUT
DR1 IN
C2
C2
–
0.1µF
+
–
V
DR2 IN
DR2 OUT
RX2 IN
RS232
LINE PINS
PROTECTED
TO ±10kV
RX2 OUT
1280A ESD TC
U
O
TYPICAL APPLICATI
Supporting an LT1039 (Triple Driver/Receiver)
SHUTDOWN
5V
18
17
8
18
17
ON/OFF
V
CC
V
CC
ON/OFF
LT1039
LT1280A
11
15
13
4
6
TTL INPUT
TTL INPUT
TTL INPUT
RS232 OUTPUT
RS232 OUTPUT
RS232 OUTPUT
RS232 OUTPUT
12
15
TTL INPUT
11
16
8
3
RS232 OUTPUT
RS232 INPUT
TTL INPUT
14
9
13
RS232 INPUT
RS232 INPUT
TTL OUTPUT
TTL OUTPUT
30k
30k
30k
5k
5k
14
12
5
7
RS232 INPUT
RS232 INPUT
TTL OUTPUT
TTL OUTPUT
10
TTL OUTPUT
2
+
C1
+
1µF
4
–
+
C1
C2
3
7
1
9
5
+
–
+
–
V
V
V
+
1µF
6
–
V
C2
+
GND
16
GND
10
1µF
1µF
+
LT1280A • TA04
6
LT1280A/LT1281A
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
0.300 – 0.325
0.130 ± 0.005
0.045 – 0.065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
14
12
10
9
15
13
11
16
0.020
(0.508)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
2
1
3
4
6
8
5
7
0.325
–0.015
0.125
(3.175)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
0.255 ± 0.015*
(6.477 ± 0.381)
+0.889
8.255
N16 1197
0.018 ± 0.003
(0.457 ± 0.076)
(
)
–0.381
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N Package
18-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.900*
(22.860)
MAX
0.300 – 0.325
(7.620 – 8.255)
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
0.020
18
17
16
15
14
13
12
11
10
(0.508)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
1
2
3
5
6
9
4
7
8
0.325
0.005
(0.127)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
–0.015
0.125
(3.175)
MIN
+0.889
8.255
0.255 ± 0.015*
(6.477 ± 0.381)
(
)
–0.381
0.018 ± 0.003
(0.457 ± 0.076)
N18 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
SW Package
16-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.291 – 0.299**
(7.391 – 7.595)
0.398 – 0.413*
(10.109 – 10.490)
15 14 12
10
9
16
13
11
0.010 – 0.029
(0.254 – 0.737)
0.037 – 0.045
0.093 – 0.104
× 45°
(0.940 – 1.143)
(2.362 – 2.642)
0° – 8°
TYP
NOTE 1
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.394 – 0.419
(10.007 – 10.643)
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.014 – 0.019
0.016 – 0.050
(0.406 – 1.270)
(0.356 – 0.482)
TYP
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
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
*
**
2
3
5
7
8
1
4
6
S16 (WIDE) 0396
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LT1280A/LT1281A
U
Dimensions in inches (millimeters) unless otherwise noted.
SW Package
PACKAGE DESCRIPTIO
18-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.291 – 0.299**
(7.391 – 7.595)
0.447 – 0.463*
(11.354 – 11.760)
14 13
11
15
12
10
18 17 16
0.010 – 0.029
(0.254 – 0.737)
0.093 – 0.104
(2.362 – 2.642)
0.037 – 0.045
(0.940 – 1.143)
× 45°
0° – 8°
TYP
SEE
NOTE
0.050
(1.270)
TYP
0.009 – 0.013
0.004 – 0.012
(0.102 – 0.305)
0.394 – 0.419
(10.007 – 10.643)
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.014 – 0.019
(0.356 – 0.482)
TYP
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
2
3
5
7
8
9
1
4
6
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
S18 (WIDE) 0396
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
U
O
TYPICAL APPLICATI
Operation Using 5V and 12V Power Supplies
2
4
5
6
17
3
12V INPUT
5V INPUT
7
–12V
OUT
LT1280A
+
0.1µF
0.1µF
+
12
15
RS232 OUTPUT
LOGIC
INPUTS
11
13
8
RS232 OUTPUT
RS232 INPUT
14
5k
5k
LOGIC
OUTPUTS
10
18
9
RS232 INPUT
16
ON/OFF
LT1280A • TA03
RELATED PARTS
PART NUMBER
LT1180A/LT1181A
LT1381
DESCRIPTION
COMMENTS
5V 2-Driver/2-Receiver RS232 Transceivers
5V 2-Driver/2-Receiver RS232 Transceiver
5V 2-Driver/2-Receiver RS232 Transceiver
Pin Compatible with LT1280A/LT1280A
Narrow 16-Pin SO Package
LT1780/LT1781
IEC 1000-4-2 Level 4 Compliance
12801afa LT/TP 1098 REV A 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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