LTC1349CN [Linear]
5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in SHUTDOWN; 5V低功耗RS232 3驱动器/ 5接收器与收发器， 2个接收器活跃在SHUTDOWN
| 型号： | LTC1349CN |
| 厂家： | 
Linear |
| 描述： | 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in SHUTDOWN |
| 文件： | 总8页 (文件大小：223K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1349
5V Low Power RS232
3-Driver/5-Receiver Transceiver
with 2 Receivers Active
in SHUTDOWN
U
DESCRIPTIO
EATURE
Low Supply Current: 300µA
Two Receivers Kept Alive in SHUTDOWN
ESD Protection Over ±10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1µF
Operates to 120k Baud
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
S
F
■
■
■
■
■
■
■
■
The LTC1349 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. In the no load condition, the
supply current is only 300µA. The charge pump only
requires four 0.1µF capacitors.
In SHUTDOWN mode, two receivers are kept alive and the
supply current is 35µA. All RS232 outputs assume a high
impedance state in SHUTDOWN and with the power off.
The LTC1349 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud 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.
■
■
■
Pin Compatible with LT1137A and LT1237
Flowthrough Architecture
O U
PPLICATI
Notebook Computers
Palmtop Computers
S
A
■
■
U
O
TYPICAL APPLICATI
Quiescent and SHUTDOWN Supply Current
vs Temperature
3-Drivers/5-Receivers with SHUTDOWN
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
60
50
40
30
20
10
0
1200
1000
800
600
400
200
0
LTC1349
C1
0.1µF
C4
V
0.1µF
CC
C3
0.1µF
3
C2
0.1µF
4
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
SHUTDOWN
CURRENT
5
DRIVER 1 OUT
RX1 IN
6
7
DRIVER 2 OUT
RX2 IN
8
QUIESCENT
CURRENT
9
RX3 IN
10
11
12
13
14
RX4 IN
DRIVER 3 OUT
RX5 IN
–20
0
20
TEMPERATURE (°C)
TEST CONDITION:
= 5V, ALL DRIVER INPUTS TIED TO V
60
80 100
–40
40
ON/OFF
NC
NC
NC
V
.
LTC1349 • TA02
LTC1349 • TA01
CC
CC
1
LTC1349
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
On/Off Pin.................................. –0.3V to VCC + 0.3V
Output Voltage
TOP VIEW
ORDER PART
+
–
V
1
2
3
4
5
6
7
8
9
28
V
NUMBER
+
–
V
27 C2
26 C2
CC
+
C1
C1
–
25 DR1 IN
24 RX1 OUT
23 DR2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19 DR3 IN
18 RX5 OUT
17 GND
LTC1349CG
LTC1349CN
LTC1349CS
LTC1349IG
LTC1349IN
LTC1349IS
DR1 OUT
RX1 IN
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short Circuit Duration
DR2 OUT
RX2 IN
RX3 IN
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
RX4 IN 10
DR3 OUT 11
RX5 IN 12
ON/OFF 13
NC 14
16 NC
15 NC
G PACKAGE
28-LEAD SSOP
N PACKAGE
28-LEAD PLASTIC DIP
Commercial (LTC1349C) ........................ 0°C to 70°C
Industrial (LTC1349I) ........................ –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
S PACKAGE
28-LEAD PLASTIC SOL
TJMAX = 125°C, θJA = 96°C/W (G)
JMAX = 125°C, θJA = 56°C/W (N)
JMAX = 125°C, θJA = 85°C/W (S)
T
T
Consult factory for Military Grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, 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
= High)
= Low)
●
●
1.4
1.4
0.8
V
V
µA
µA
OUT
OUT
Input High Level (V
2.0
0.8
V
IN
V
IN
= 5V
= 0V
●
●
5
–5
Output Short-Circuit Current
Output Leakage Current
Any Receiver
V
OUT
= 0V
±12
±10
mA
µA
SHUTDOWN, V
= ±20V (Note 3)
●
±500
OUT
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
●
●
1.3
1.7
V
V
2.4
1.0
7
Hysteresis
●
0.1
3
0.4
5
0.2
4.8
V
Input Resistance
Output Voltage
–10V ≤ V ≤ 10V
kΩ
V
V
IN
Output Low, I
= – 1.6mA (V = 5V)
= 160µA (V = 5V)
●
●
0.4
OUT
OUT
CC
Output High, I
3.5
CC
Output Short-Circuit Current
Output Leakage Current
Power Supply Generator
Sinking Current, V
= V
–15
–40
1
mA
OUT
CC
SHUTDOWN, 0 ≤ V
≤ V (Note 3)
●
10
µA
OUT
CC
+
V Output Voltage
I
I
= 0mA
= 12mA
8.0
7.5
V
V
OUT
OUT
–
V Output Voltage
I
I
= 0mA
= –12mA
–8.0
–7.0
V
V
OUT
OUT
Supply Rise Time
SHUTDOWN to Turn-On
0.2
ms
2
LTC1349
DC ELECTRICAL CHARACTERISTICS V
CC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Power Supply
CONDITIONS
MIN
TYP
MAX
UNITS
V
Supply Current
No Load (All Drivers V = V )(Note 2), 0 ≤ T ≤ 70°C
●
●
●
●
0.3
0.5
0.3
0.5
0.8
1.0
1.0
1.5
mA
mA
mA
mA
CC
IN
CC
A
No Load (All Drivers V = 0V)(Note 2), 0 ≤ T ≤ 70°C
IN
A
No Load (All Drivers V = V )(Note 2), –40°C ≤ T ≤ 85°C
IN
CC
A
No Load (All Drivers V = 0V)(Note 2), –40°C ≤ T ≤ 85°C
IN
A
Supply Leakage Current (V
On/Off Threshold Low
On/Off Threshold High
)
SHUTDOWN (Note 3)
●
●
●
35
1.4
1.4
50
0.8
µA
V
V
CC
2.0
V
CC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
AC CHARACTERISTICS
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
0.2
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 (0°C ≤ T ≤ 70°Cfor commercial grade, –40°C ≤ T ≤ 85°C for
A
A
industrial grade).
Note 3: Supply current and leakage current measurements in SHUTDOWN
Note 1: Absolute Maximum Ratings are those values beyond which the life
are performed with V
= 0V.
ON/OFF
of the device may be impaired.
W U
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
Receiver Input Thresholds
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
L
= 3k
OUTPUT HIGH
= 5V
V
= 5V
CC
L
L
V
CC
R
= 3k
C
= 2500pF
6
V
CC
= 4.5V
3 DRIVERS ACTIVE
4
2
V
TH
0
V
TL
–2
–4
–6
1.4
1.2
1.0
OUTPUT LOW
= 4.5V
V
CC
V
CC
= 5V
0
–8
40
TEMPERATURE (˚C)
80
100
75
DATA RATE (k BAUD)
–40 –20
0
20
100
–40 –20
0
20
60
0
25
50
100 125 150 175
40
60
80
TEMPERATURE (°C)
LTC1349 • TPC01
LTC1349 • TPC02
LTC1349 • TPC03
3
LTC1349
TYPICAL PERFOR A CE CHARACTERISTICS
W U
VCC Supply Current
Driver Leakage in SHUTDOWN
Driver Short-Circuit Current
20
16
14
12
10
8
45
40
35
30
25
20
15
10
5
20
18
16
14
12
10
8
–
I
3 DRIVERS LOADED
SC
R
= 3k
L
+
I
SC
V
= –20V
OUT
1 DRIVER LOADED
6
R
L
= 3k
6
4
V
= 20V
50
OUT
2
4
0
0
0
30
TEMPERATURE (°C)
30
0
10
20
40
50
60
70
0
10
20
40
60
70
–40 –20
0
20
80 100
40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1349 • TPC04
LTC1349 • TPC05
LTC1349 • TPC06
Receiver Short-Circuit Current
Receiver Output Waveforms
Driver Output Waveforms
60
50
40
30
20
10
DRIVER
OUTPUT
RECEIVER
OUTPUT
R
L = 3k
CL = 2500pF
C
L = 2500pF
DRIVER
OUTPUT
RL = 3k
–
I
SC
INPUT
INPUT
+
I
SC
LTC1349 • TPC08
LTC1349 • TPC09
–40
0
20
40
60
80 100
–20
TEMPERATURE (°C)
LTC1349 • TPC07
U
U
U
PI FU CTIO S
With multiple devices, the V + and V– pins may be paral-
leled into common capacitors. For large numbers of de-
vices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
VCC: 5V Input Supply Pin. Supply current is typically 35µA
in the SHUTDOWN mode. This pin should be decoupled
with a 0.1µF ceramic capacitor.
GND: Ground Pin.
V–: Negative Supply Output (RS232 Drivers). V – 2VCC
–
ON/OFF: TTL/CMOS Compatible SHUTDOWN Pin. A logic
low puts the device in SHUTDOWN mode, with receivers
4 and 5 kept alive and the supply current equal to 35µA. All
driver outputs and other receiver outputs are in high
impedance state. This pin can not float.
1.5V. 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
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.
V+: Positive Supply Output (RS232 Drivers). V+ 2VCC
–
1V. This pin requires an external capacitor C = 0.1µF for
chargestorage. Thecapacitormaybetiedtogroundor5V.
4
LTC1349
U
U
U
PI FU CTIO S
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
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.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in SHUT-
DOWNmodeorVCC =0V. Thedriveroutputsareprotected
against ESD to ±10kV for human body model discharges.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Receiver 1, 2 and 3 outputs are in a high impedance
statewheninSHUTDOWNmodetoallowdatalinesharing.
Receivers 4 and 5 are kept alive in SHUTDOWN.
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
LHR
t
LHD
HLR
HLD
LTC1349 • F02
LTC1349 • 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
LTC1349 • TA04
LTC1349 • TA03
5
LTC1349
TEST CIRCUITS
ESD Test Circuit
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
LTC1349
C1
0.1µF
C4
0.1µF
V
CC
C3
0.1µF
3
C2
0.1µF
4
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
5
DRIVER 1 OUT
RX1 IN
6
7
RS232
LINE PINS
PROTECTED
TO ±10kV
DRIVER 2 OUT
RX2 IN
8
9
RX3 IN
10
11
12
13
14
RX4 IN
DRIVER 3 OUT
RX5 IN
NC
ON/OFF
NC
NC
LTC1349 • TC
6
LTC1349
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
G Package
28-Lead SSOP
0.397 – 0.407*
(10.07 – 10.33)
0.205 – 0.212*
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
28 27 26 25 24 23 22 21 20 19 18
16 15
17
0° – 8°
0.301 – 0.311
(7.65 – 7.90)
0.045
(1.14)
0.0256
(0.65)
BSC
0.022 – 0.037
0.005 – 0.009
(0.55 – 0.95)
(0.13 – 0.22)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
5
7
8
1
2
3
4
6
9
10 11 12 13 14
0.045
(1.14)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
N Package
28-Lead Plastic DIP
1.455
(36.957)
MAX
0.070
(1.778)
TYP
0.600 – 0.625
(15.240 – 15.875)
0.130 ± 0.005
(3.302 ± 0.127)
0.045 – 0.065
(1.143 – 1.651)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.015
(0.381)
MIN
0.505 – 0.560
(12.827 – 14.224)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.035 – 0.080
(0.889 – 2.032)
0.125
(3.175)
MIN
0.625
0.018 ± 0.003
(0.457 ± 0.076)
–0.015
+0.635
15.87
1
2
3
4
5
6
7
8
9
10 11 12 13 14
0.100 ± 0.010
(2.540 ± 0.254)
(
)
–0.381
S Package
28-Lead SOL
0.697 – 0.712
(17.70 – 18.08)
(NOTE 2)
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.037 – 0.045
(0.940 – 1.143)
0.005
(0.127)
RAD MIN
0.093 – 0.104
(2.362 – 2.642)
28 27 26 25 24 23 22 21 20 19 18
16 15
17
0.010 – 0.029
(0.254 – 0.737)
× 45°
0° – 8° TYP
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.050
(1.270)
TYP
0.009 – 0.013
(0.229 – 0.330)
0.014 – 0.019
(0.356 – 0.482)
0.004 – 0.012
(0.102 – 0.305)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
NOTE:
1
2
3
5
7
8
9 10 11 12 13 14
4
6
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
LTC1349
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
FRANCE
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
TAIWAN
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
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
Phone: 82-2-792-1617
FAX: 82-2-792-1619
Phone: 33-1-41079555
FAX: 33-1-46314613
SINGAPORE
UNITED KINGDOM
GERMANY
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Linear Techonolgy GMBH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 65-293-5322
FAX: 65-292-0398
Phone: 44-276-677676
FAX: 44-276-64851
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
08/16/93
LT/GP 1093 10K REV 0 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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