LTC1382 [Linear]
5V Low Power RS232 Transceiver with Shutdown; 5V低功耗RS232收发器，带有关断
| 型号： | LTC1382 |
| 厂家： | 
Linear |
| 描述： | 5V Low Power RS232 Transceiver with Shutdown |
| 文件： | 总8页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1382
5V Low Power
RS232 Transceiver
with Shutdown
U
DESCRIPTIO
EATURE
S
F
■
■
■
■
■
■
■
Operates from a Single 5V Supply
Low Supply Current: ICC = 220µA
ICC = 0.2µA in Shutdown Mode
ESD Protection Over ±10kV
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
Pin Compatible with LT1180A
The LTC1382 is an ultra-low power 2-driver/2-receiver
RS232 transceiver that operates from a single 5V
supply. The charge pump requires only four space-
saving 0.1µF capacitors.
The transceiver operates in one of two modes, Normal
and Shutdown. In the Normal mode, I is only 220µA
CC
with the driver outputs unloaded. In the Shutdown
mode, thechargepumpisturnedoff, thedriveroutputs
are forced into three-state, both receivers are off and
■
■
I
drops to 0.2µA.
CC
The LTC1382 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.
O U
PPLICATI
S
A
■
Notebook Computers
Palmtop Computers
■
U
O
TYPICAL APPLICATI
Quiescent and Shutdown Supply Current
vs Temperature
2-Drivers/2-Receivers with Shutdown
600
500
400
300
200
100
0
1.2
1.0
0.8
0.6
0.4
0.2
0
2
4
5
6
17
3
TEST CONDITION: V = 5V
V
= 5V
CC
CC
0.1µF
0.1µF
LTC1382
0.1µF
7
0.1µF
V
V
CC
CC
300k
QUIESCENT
CURRENT
12
15
LOGIC INPUT
232 OUTPUT
300k
SHUTDOWN
CURRENT
11
13
8
LOGIC INPUT
232 OUTPUT
232 INPUT
14
LOGIC OUTPUT
5k
–20
20
40
60
80
0
TEMPERATURE (°C)
10
18
9
LOGIC OUTPUT
ON/OFF
232 INPUT
LTC1382 • TA02
5k
16
LTC1382 • TA01
1
LTC1382
W W W
U
/O
ABSOLUTE AXI U RATI GS
PACKAGE RDER I FOR ATIO
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
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short-Circuit Duration
ORDER PART
TOP VIEW
NUMBER
1
2
3
4
5
6
7
8
9
ON/OFF
18
17
16
15
14
13
12
11
10
NC
+
V
C1
LTC1382CN
LTC1382CS
CC
+
–
+
–
–
GND
V
C1
C2
C2
V
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TR2 OUT
RX2 IN
N PACKAGE
S PACKAGE
18-LEAD PLASTIC DIP 18-LEAD PLASTIC SOL
TJMAX = 125°C, θJA = 56°C/W (N)
JMAX = 125°C, θJA = 85°C/W (S)
T
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC unless otherwise 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
mA
µA
OUT
2.0
OUT
V
IN
V
IN
= V
= 0V
●
●
5
–40
CC
–20
±12
±10
Output Short-Circuit Current
Output Leakage Current
Any Receiver
V
OUT
= 0V
Shutdown or V = 0V (Note 3), V
= ±20V
●
±500
CC
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
Output Leakage Current
Sinking Current, V
Sourcing Current V
Shutdown (Note 3), 0V ≤ V
= V
–15
10
–40
20
1
mA
mA
µA
OUT
CC
= 0V
OUT
≤ V
●
10
OUT
CC
2
LTC1382
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
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
Supply Rise Time
Shutdown to Turn-On
0.2
ms
Power Supply
V
Supply Current
No Load (Note 2)
Shutdown (Note 3)
●
●
●
●
0.22
0.2
1.4
1.4
0.5
10
0.8
mA
µA
V
CC
Supply Leakage Current (V
Digital Input Threshold Low
Digital Input Threshold High
)
CC
2.0
V
AC CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Slew Rate
CONDITIONS
R = 3k, C = 51pF
MIN
TYP
8
5
MAX
30
UNITS
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
The
●
denotes specifications which apply over the operating temperature
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
range of 0°C ≤ T ≤ 70°C.
A
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 3: Measurements made in the Shutdown mode are performed
with V
= 0V.
ON/OFF
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
Supply Current vs Data Rate
2.2
2.0
1.8
1.6
10
8
45
40
35
30
25
20
15
10
5
R
= 3k
V
= 5V
OUTPUT HIGH
L
CC
R
= 3k
V
= 5V
L
L
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)
LTC1382 • TPC02
LTC1382 • TPC01
LTC1382 • TPC03
3
LTC1382
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
VCC Supply Current
vs Temperature
Driver Short-Circuit Current
vs Temperature
Receiver Short-Circuit Current
vs Temperature
18
16
14
12
10
8
18
16
14
12
10
8
50
40
30
20
10
–
I
SC
+
–
I
SC
I
SC
2 DRIVERS LOADED
= 3k
R
L
1 DRIVER LOADED
6
6
R
L
= 3k
4
4
+
I
SC
2
2
0
0
0
10
20
30
60
70
0
10
20
30
60
70
40
50
0
10
20
30
60
70
40
50
40
50
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1382 • TPC04
LTC1382 • TPC06
LTC1382 • TPC05
Driver Leakage in Shutdown
vs Temperature
Receiver Output Waveforms
Driver Output Waveforms
45
40
35
30
25
20
15
10
5
DRIVER
OUTPUT
RECEIVER
OUTPUT
R
L = 3k
C
L = 2500pF
C
L = 51pF
DRIVER
OUTPUT
R
L = 3k
V
= –20V
OUT
INPUT
INPUT
V
= 20V
50
OUT
LTC1382 • TPC08
LTC1382 • TPC09
0
30
0
10
20
40
60
70
TEMPERATURE (°C)
LTC1349 • TPC05
4
LTC1382
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.
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. To minimize power consumption, the
internaldriverpull-upresistorsaredisconnectedfromVCC
in the Shutdown mode.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode. Both driver
outputs are forced into three-state and the supply current
is 0.2µA.
V+: Positive Supply Output (RS232 Drivers). V+ 2VCC
–
TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs
are in a high impedance state when in the Shutdown or
VCC = 0V. The driver outputs are protected against ESD to
±10kV for human body model discharges.
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.
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.
V–:NegativeSupplyOutput(RS232Drivers).V – –(2VCC
– 2V). This pin requires an external capacitor C = 0.1µF for
charge storage.
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 Lev-
els. Outputs are in a high impedance state when in the
Shutdown mode.
U
W
W
SWITCHI G TI E WAVEFOR S
V
V
CC
CC
1.7V
RX
INPUT
DRIVER
INPUT
1.4V
1.3V
1.4V
0V
0V
+
V
V
DRIVER
OUTPUT
CC
RX
OUTPUT
0V
0V
2.4V
–
V
0.8V
0V
t
t
LHD
HLD
t
t
LHR
HLR
LTC1382 • F01
LTC1382 • F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
5
LTC1382
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
RX
OUTPUT
DRIVER
OUTPUT
DRIVER
INPUT
RX INPUT
DRIVER
RX
51pF
51pF
3k
LTC1382 • TA04
LTC1382 • TA03
ESD Test Circuit
2
4
5
6
17
3
V
= 5V
CC
0.1µF
0.1µF
LTC1382
7
0.1µF
0.1µF
V
V
CC
300k
300k
12
15
LOGIC INPUT
232 OUTPUT
CC
11
13
8
RS232
LOGIC INPUT
232 OUTPUT
232 INPUT
LINE PINS
PROTECTED
TO ±10kV
14
LOGIC OUTPUT
5k
10
18
9
LOGIC OUTPUT
ON/OFF
232 INPUT
5k
16
LTC1382 • TA04
6
LTC1382
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
N Package
18-Lead Plastic DIP
0.905
(22.860)
MAX
18
17
16
15
14
13
12
11
10
0.260 ± 0.010
(6.604 ± 0.254)
1
2
3
5
6
9
4
7
8
0.300 – 0.325
0.130 ± 0.005
0.045 – 0.065
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
0.015
(0.381)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.025
–0.015
0.325
0.125
(3.175)
MIN
0.045 ± 0.015
(1.143 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
N18 0392
S Package
18-Lead Plastic SOL
0.447 – 0.463
(11.354 – 11.760)
(NOTE 2)
14 13
11
15
12
10
18 17 16
0.394 – 0.419
(10.007 – 10.643)
SEE NOTE
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
2
3
5
7
8
9
1
4
6
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
0.005
(0.127)
RAD MIN
0.010 – 0.029
(0.254 – 0.737)
× 45°
0° – 8° TYP
0.050
(1.270)
TYP
0.004 – 0.012
0.009 – 0.013
(0.102 – 0.305)
(0.229 – 0.330)
NOTE 1
0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
SOL18 0392
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. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
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
LTC1382
U.S. Area Sales Offices
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Phone: (215) 757-8578
FAX: (215) 757-5631
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
Phone: (508) 658-3881
FAX: (508) 658-2701
International Sales Offices
KOREA
TAIWAN
FRANCE
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Phone: 82-2-792-1617
FAX: 82-2-792-1619
Phone: 33-1-41079555
FAX: 33-1-46314613
UNITED KINGDOM
SINGAPORE
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Phone: 44-276-677676
FAX: 44-276-64851
GERMANY
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Phone: 65-293-5322
FAX: 65-292-0398
Linear Techonolgy GmbH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 49-89-3197410
FAX: 49-89-3194821
JAPAN
Linear Technology KK
5F YZ Bldg.
4-4-12 Iidabashi, Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
0294
LT/GP 0594 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
LINEAR TECHNOLOGY CORPORATION 1994
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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