LTC1383_1 [Linear]
5V Low Power RS232 Transceiver; 5V低功耗RS232收发器
| 型号： | LTC1383_1 |
| 厂家： | 
Linear |
| 描述： | 5V Low Power RS232 Transceiver |
| 文件： | 总8页 (文件大小：110K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1383
5V Low Power
RS232 Transceiver
U
FEATURES
DESCRIPTIO
TheLTC®1383isanultra-lowpower2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1µF capacitors. The supply current (I ) of the
transceiverisonly220µAwithdriveroutputsunloaded.
■
Operates from a Single 5V Supply
■
Low Supply Current: ICC = 220µA
■
ESD Protection Over ±10kV
Available in 16-Pin SOIC Narrow Package
■
CC
■
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
■
The LTC1383 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120kbaud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage and can survive multiple ±10kV
ESD strikes.
■
Output Overvoltage Does Not Force Current
Back into Supplies
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
■
Pin Compatible with LT1181A and MAX232A
U
APPLICATIO S
■
Notebook Computers
Palmtop Computers
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Quiescent Supply Current vs Temperature
600
1
3
4
5
16
2
TEST CONDITION: V = 5V
V
= 5V
CC
CC
0.1µF
0.1µF
500
400
300
200
100
0
LTC1383
0.1µF
6
0.1µF
V
V
CC
CC
300k
QUIESCENT
CURRENT
11
14
LOGIC INPUT
232 OUTPUT
300k
10
12
7
LOGIC INPUT
232 OUTPUT
232 INPUT
13
LOGIC OUTPUT
5k
–20
20
40
60
80
0
TEMPERATURE (°C)
9
8
LOGIC OUTPUT
232 INPUT
LTC1383 • TA02
5k
15
LTC1383 • TA01
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1
LTC1383
W W U W
U W
U
ABSOLUTE AXI U RATI GS
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Driver ....................................... –0.3V to VCC + 0.3V
Receiver ............................................... – 25V to 25V
Digital Input............................... –0.3V to VCC + 0.3V
Output Voltage
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
+
+
–
+
–
–
1
2
3
4
5
6
7
8
V
CC
16
15
14
13
12
11
10
9
C1
V
LTC1383CN
LTC1383CS
LTC1383IN
LTC1383IS
GND
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
C1
C2
C2
V
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short-Circuit Duration
TR2 OUT
RX2 IN
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
N PACKAGE
16-LEAD PDIP
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 70°C/W (N)
TJMAX = 125°C, θJA = 90°C/W (S)
LTC1383C ............................................... 0°C to 70°C
LTC1383I............................................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Consult LTC Marketing for parts specified with wider operating
temperature ranges.
DC ELECTRICAL CHARACTERISTICS
The ■ denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
3k to GND
Positive
Negative
■
■
5.0
–5.0
7.0
– 6.5
V
V
Logic Input Voltage Level
Logic Input Current
Input Low Level (V
Input High Level (V
= High)
= Low)
■
■
1.4
1.4
0.8
V
V
µA
µA
OUT
2.0
OUT
V
V
= V
= 0V
■
■
5
–40
IN
IN
CC
–20
Output Short-Circuit Current
Any Receiver
V
= 0V
±9
±12
mA
OUT
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
■
■
0.8
1.3
1.7
0.4
5
0.2
3.2
V
V
V
kΩ
V
V
2.4
1
7
Hysteresis
Input Resistance
Output Voltage
■
0.1
3
–10V ≤ V ≤ 10V
IN
Output Low, I
Output High, I
= – 1.6mA (V = 5V)
= 160µA (V = 5V)
■
■
0.4
OUT
CC
3.0
OUT
CC
Output Short-Circuit Current
Sinking Current, V
Sourcing Current V
= V
–15
10
–40
20
mA
mA
OUT
CC
= 0V
OUT
Power Supply Generator
+
V Output Voltage
I
I
I
I
= 0mA
= 8mA
= 0mA
8.0
7.5
–8.0
–7.0
V
V
V
V
OUT
OUT
–
V Output Voltage
OUT
OUT
= –8mA
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2
LTC1383
DC ELECTRICAL CHARACTERISTICS
The ■ denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
PARAMETER
Power Supply
CONDITIONS
MIN
TYP
MAX
UNITS
V
Supply Current
No Load (Note 2), 0°C to 70°C
No Load (Note 2), – 40°C to 85°C
■
■
0.22
0.35
0.5
1.0
mA
mA
CC
Digital Input Threshold Low
Digital Input Threshold High
■
■
1.4
1.4
0.8
V
V
2.0
AC CHARACTERISTICS
The ■ denotes specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
PARAMETER
CONDITIONS
R = 3k, C = 51pF
MIN
TYP
MAX
UNITS
Slew Rate
8
5
30
V/µs
V/µs
L
L
R = 3k, C = 2500pF
3
L
L
Driver Propagation Delay
(TTL to RS232)
t
t
(Figure 1)
(Figure 1)
■
■
2
2
3.5
3.5
µs
µs
HLD
LHD
Receiver Propagation Delay
(RS232 to TTL)
t
t
(Figure 2)
(Figure 2)
■
■
0.3
0.3
0.8
0.8
µs
µs
HLR
LHR
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
Supply Current vs Data Rate
10
8
45
40
35
30
25
20
15
10
5
2.2
2.0
1.8
1.6
R
= 3k
V
= 5V
OUTPUT HIGH
L
CC
L
L
R
= 3k
V
= 5V
CC
C
= 2500pF
6
2 DRIVERS ACTIVE
V
TH
V
= 4.5V
CC
4
2
0
V
TL
–2
–4
–6
1.4
1.2
1.0
OUTPUT LOW
V
= 4.5V
CC
V
= 5V
CC
–8
0
40
TEMPERATURE (˚C)
60
70
0
10
20
30
50
0
10
20
30
70
0
25
50
75
150 175
40
50
60
100 125
TEMPERATURE (°C)
DATA RATE (kBAUD)
LTC1383 • TPC02
LTC1383 • TPC01
LTC1383 • TPC03
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3
LTC1383
U W
TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current
vs Temperature
Driver Output Waveforms
Receiver Output Waveforms
18
16
14
12
10
8
DRIVER
OUTPUT
RL = 3k
RECEIVER
OUTPUT
CL = 2500pF
CL = 51pF
DRIVER
OUTPUT
RL = 3k
2 DRIVERS LOADED
= 3k
R
L
INPUT
1 DRIVER LOADED
INPUT
6
R
= 3k
L
4
LTC1383 • TPC05
LTC1383 • TPC06
2
5µs/DIV
5µs/DIV
0
0
10
20
30
60
70
40
50
TEMPERATURE (°C)
LTC1383 • TPC04
U
U
U
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor.
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2Ω.
GND: Ground Pin.
V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2VCC
TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS
compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip.
–
2V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or
VCC. With multiple devices, the V + and V– pins may share
a common capacitor. For large numbers of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
V–:NegativeSupplyOutput(RS232Drivers).V – ≅– (2VCC
– 2V). This pin requires an external capacitor C = 0.1µF for
charge storage.
TR OUT: Driver Outputs at RS232 Voltage Levels. The
driver outputs are protected against ESD to ±10kV for
human body model discharges.
RX IN: Receiver Inputs. These pins can be forced to ±25V
withoutdamage. Thereceiverinputsareprotectedagainst
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
C1+,C1–,C2+,C2–:CommutatingCapacitorInputs.These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1– and another from C2+ to C2–. To maintain
RX OUT: Receiver Outputs with TTL/CMOS Voltage
Levels.
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4
LTC1383
U
W
W
SWITCHI G TI E WAVEFOR S
V
V
CC
CC
1.7V
RX
DRIVER
1.3V
1.4V
INPUT
1.4V
INPUT
0V
V
0V
+
V
CC
RX
OUTPUT
DRIVER
OUTPUT
2.4V
0V
0V
0.8V
–
V
0V
t
t
t
t
LHR
LHD
HLR
HLD
LTC1383 • F02
LTC1383 • F01
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
OUTPUT
RX
OUTPUT
DRIVER
INPUT
RX INPUT
DRIVER
RX
51pF
51pF
3k
LTC1383 • TA04
LTC1383 • TA03
ESD Test Circuit
1
3
4
5
16
2
V
CC
0.1µF
0.1µF
LTC1383
0.1µF
6
0.1µF
V
V
CC
300k
300k
11
14
LOGIC INPUT
232 OUTPUT
CC
10
12
7
RS232
LOGIC INPUT
232 OUTPUT
232 INPUT
LINE PINS
PROTECTED
TO ±10kV
13
LOGIC OUTPUT
5k
9
8
LOGIC OUTPUT
232 INPUT
5k
15
LTC1383 • TA05
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5
LTC1383
U
TYPICAL APPLICATIO S
Paralleling Power Supply Generator
with Common Storage Capacitors
1
16
2
1
3
4
5
16
2
V
= 5V
V
= 5V
CC
CC
0.1µF
0.1µF
0.1µF
3
LTC1383
4
LTC1383
0.1µF
6
6
0.1µF
5
0.1µF
V
V
V
CC
CC
CC
300k
300k
300k
11
14
11
14
LOGIC INPUT
232 OUTPUT
LOGIC INPUT
232 OUTPUT
V
CC
300k
10
12
7
10
12
7
LOGIC INPUT
232 OUTPUT
232 INPUT
LOGIC INPUT
232 OUTPUT
232 INPUT
13
13
LOGIC OUTPUT
LOGIC OUTPUT
5k
5k
5k
9
8
9
8
LOGIC OUTPUT
232 INPUT
LOGIC OUTPUT
232 INPUT
5k
15
15
LTC1383 • TA06
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6
LTC1383
U
PACKAGE DESCRIPTIO
N Package
16-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
14
12
10
9
8
15
13
11
16
.255 ± .015*
(6.477 ± 0.381)
2
1
3
4
6
5
7
.300 – .325
.130 ± .005
.045 – .065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
–.015
.325
.120
(3.048)
MIN
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
N16 1002
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
1383fa
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
LTC1383
U
PACKAGE DESCRIPTIO
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.386 – .394
(9.804 – 10.008)
.045 ±.005
NOTE 3
.050 BSC
N
16
N
15
14
13
12
11
10
9
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
2
3
N/2
N/2
8
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
5
7
1
2
3
4
6
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S16 0502
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
RELATED PARTS
PART NUMBER
LT1780/LT1781
LTC1382
DESCRIPTION
COMMENTS
±15kV ESD per IEC 1000-4
220µA Supply Current, 0.2µA in Shutdown
5V, 2 Driver, 2 Receiver RS232 Transeivers
5V, 2 Driver, 2 Receiver RS232 Transceiver
5V, 2 Driver, 2 Receiver RS232 Transceiver
3.3V, 2 Driver, 2 Receiver RS562 Transceiver
3.3V, 2 Driver, 2 Receiver RS562 Transceiver
LTC1384
220µA Supply Current, 2 Receivers Active in Shutdown
220µA Supply Current, 2 Receivers Active in Shutdown
220µA Supply Current, Narrow 16-pin SO
LTC1385
LTC1386
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LW/TP 1002 1K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
■
■
(408) 432-1900 FAX: (408) 434-0507 linear.com
LINEAR TECHNOLOGY CORPORATION 1994
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