LTC1349CSW#TRPBF [Linear]
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| 型号： | LTC1349CSW#TRPBF |
| 厂家： | 
Linear |
| 描述： | 暂无描述 驱动器 |
| 文件： | 总8页 (文件大小：115K) |
| 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
FEATURES
DESCRIPTIO
The LTC®1349 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.
■
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
Pin Compatible with LT1137A and LT1237
Flowthrough Architecture
■
■
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.
■
■
■
U
APPLICATIO S
■
Notebook Computers
Palmtop Computers
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Quiescent and Shutdown Supply Current
vs Temperature
3-Drivers/5-Receivers with Shutdown
60
50
40
30
20
10
0
–
1200
1000
800
600
400
200
0
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
LTC1349
C1
0.1µF
C4
V
0.1µF
CC
C3
0.1µF
3
C2
0.1µF
SHUTDOWN
CURRENT
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
DRIVER 2 OUT
RX2 IN
QUIESCENT
CURRENT
8
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 .
CC
LTC1349 • TA02
60
80 100
–40
40
ON/OFF
NC
NC
NC
V
CC
LTC1349 • TA01
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1
LTC1349
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
On/Off Pin.................................. –0.3V to VCC + 0.3V
Output Voltage
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
+
V
1
2
3
4
5
6
7
8
9
28 V–
V
27 C2+
CC
+
C1
C1–
26 C2–
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
LTC1349CNW
LTC1349CSW
LTC1349IG
LTC1349INW
LTC1349ISW
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short Circuit Duration
RX4 IN 10
DR3 OUT 11
RX5 IN 12
ON/OFF 13
NC 14
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
16 NC
15 NC
G PACKAGE
28-LEAD SSOP
NW PACKAGE
28-LEAD PDIP
SW PACKAGE
28-LEAD PLASTIC SO
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
TJMAX = 125°C, θJA = 96°C/W (G)
T
JMAX = 125°C, θJA = 56°C/W (NW)
TJMAX = 125°C, θJA = 85°C/W (SW)
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. 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
= High)
= Low)
■
■
1.4
1.4
0.8
V
V
OUT
OUT
Input High Level (V
2.0
V
V
= 5V
= 0V
■
■
5
–5
µA
µA
IN
IN
Output Short-Circuit Current
Output Leakage Current
Any Receiver
V
= 0V
±9
±12
±10
mA
OUT
Shutdown, V
= ±20V (Note 3)
■
±500
µA
OUT
Input Voltage Thresholds
Input Low Threshold
Input High Threshold
■
■
0.8
1.3
1.7
V
V
2.4
1.0
7
Hysteresis
■
0.1
3
0.4
5
V
Input Resistance
Output Voltage
–10V ≤ V ≤ 10V
kΩ
IN
Output Low, I
= – 1.6mA (V = 5V)
= 160µA (V = 5V)
■
■
0.2
4.8
0.4
V
V
OUT
OUT
CC
CC
Output High, I
3.5
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
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2
LTC1349
DC ELECTRICAL CHARACTERISTICS
The ■ denotes specifications which apply over the full operating
temperature range. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
PARAMETER
Power Supply
CONDITIONS
MIN
TYP
MAX
UNITS
V
Supply Current
No Load (All Drivers V = V )(Note 2), 0°C ≤ T ≤ 70°C
■
■
■
■
■
0.3
0.5
0.3
0.3
0.5
0.8
1.0
1.0
1.5
1.5
mA
mA
mA
mA
mA
CC
IN
CC
A
No Load (All Drivers V = 0V)(Note 2), 0°C ≤ T ≤ 70°C
IN
A
No Load (All Drivers V = V )(Note 2), 0°C ≤ T ≤ 85°C
IN
CC
A
No Load (All Drivers V = V )(Note 2), –40°C ≤ T ≤ 0°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
)
CC
Shutdown (Note 3)
■
■
■
35
1.4
1.4
50
0.8
µA
V
V
2.0
AC CHARACTERISTICS
The ■ denotes specifications which apply over the full operating temperature range.
V
CC = 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
0.2
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 3: Supply current and leakage current measurements in Shutdown
are performed with V
= 0V.
ON/OFF
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
Receiver Input Thresholds
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
OUTPUT HIGH
= 5V
L
V
= 5V
CC
L
L
V
CC
R
= 3k
C
= 2500pF
6
V
= 4.5V
CC
3 DRIVERS ACTIVE
4
V
2
TH
V
0
TL
–2
–4
–6
1.4
1.2
1.0
OUTPUT LOW
= 4.5V
V
CC
V
= 5V
CC
0
–8
40
TEMPERATURE (˚C)
80
100
–40 –20
0
20
60
–40 –20
0
20
100
75
DATA RATE (k BAUD)
40
60
80
0
25
50
100 125 150 175
TEMPERATURE (°C)
LTC1349 • TPC02
LTC1349 • TPC01
LTC1349 • TPC03
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3
LTC1349
TYPICAL PERFOR A CE CHARACTERISTICS
U W
VCC Supply Current
Driver Short-Circuit Current
Driver Leakage in Shutdown
20
16
14
12
10
8
45
40
35
30
25
20
15
10
5
20
18
16
14
12
10
8
–
3 DRIVERS LOADED
I
SC
R
L
= 3k
+
I
SC
V
OUT
= –20V
1 DRIVER LOADED
6
R
L
= 3k
4
6
V
= 20V
50
OUT
40
2
4
0
0
0
30
TEMPERATURE (°C)
30
0
10
20
40
50
60
70
0
10
20
60
70
–40 –20
0
20
80 100
40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1349 • TPC04
LTC1349 • TPC05
LTC1349 • TPC06
Receiver Short-Circuit Current
Driver Output Waveforms
Receiver Output Waveforms
60
50
40
30
20
10
DRIVER
OUTPUT
RECEIVER
OUTPUT
RL = 3k
C
L = 2500pF
CL = 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
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.
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.
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.
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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 Shutdown
modeorVCC =0V.Thedriveroutputsareprotectedagainst
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
state when in Shutdown mode to allow data line sharing.
Receivers 4 and 5 are kept alive in Shutdown.
U
W
W
SWITCHI G TI E WAVEFOR S
V
CC
DRIVER
INPUT
1.4V
1.4V
0V
+
V
DRIVER
OUTPUT
0V
0V
–
V
t
t
LHD
HLD
LTC1349 • F01
Figure 1. Driver Propagation Delay Timing
V
CC
1.7V
RX
INPUT
1.3V
0V
V
CC
RX
OUTPUT
2.4V
0.8V
0V
t
t
LHR
HLR
LTC1349 • F02
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
Receiver Timing Test Load
DRIVER
OUTPUT
RX
OUTPUT
DRIVER
INPUT
RX INPUT
DRIVER
RX
51pF
51pF
3k
LTC1349 • TA04
LTC1349 • TA03
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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
1349fa
6
LTC1349
U
PACKAGE DESCRIPTIO
G Package
28-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
9.90 – 10.50*
(.390 – .413)
1.25 ±0.12
28 27 26 25 24 23 22 21 20 19 18
16 15
17
7.8 – 8.2
5.3 – 5.7
7.40 – 8.20
(.291 – .323)
0.42 ±0.03
0.65 BSC
5
7
8
1
2
3
4
6
9 10 11 12 13 14
RECOMMENDED SOLDER PAD LAYOUT
5.00 – 5.60**
(.197 – .221)
2.0
(.079)
0° – 8°
0.65
(.0256)
BSC
0.09 – 0.25
0.55 – 0.95
(.0035 – .010)
(.022 – .037)
0.05
0.22 – 0.38
(.009 – .015)
(.002)
NOTE:
G28 SSOP 0802
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
3. DRAWING NOT TO SCALE
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED .152mm (.006") PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE
NW Package
28-Lead PDIP (Wide .600 Inch)
(Reference LTC DWG # 05-08-1520)
1.467*
(36.957)
MAX
28
27
26
25
24
23
22
21
20
19
18
17
16
15
.505 – .560*
(12.827 – 14.224)
1
2
3
5
7
9
4
6
8
10
11
12
13
14
.600 – .625
(15.240 – 15.875)
.045 – .065
(1.143 – 1.651)
.150 ± .005
(3.810 ± 0.127)
.015
(0.381)
MIN
.070
(1.778)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.625
.035 – .080
(0.889 – 2.032)
–.015
.120
(3.175)
MIN
.018 ± .003
(0.457 ± 0.076)
+0.889
15.87
(
)
–0.381
.100
(2.54)
BSC
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NW28 1002
1349fa
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
PACKAGE DESCRIPTIO
SW Package
28-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
TYP
.697 – .712
(17.70 – 18.08)
NOTE 4
N
28 27 26 25 24 23 22 21 20 19 18
16 15
17
N
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
1
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
.291 – .299
(7.391 – 7.595)
NOTE 4
2
3
5
7
8
9
10 11 12 13 14
1
4
6
.037 – .045
(0.940 – 1.143)
.093 – .104
.010 – .029
× 45°
(2.362 – 2.642)
(0.254 – 0.737)
.005
(0.127)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
.009 – .013
NOTE 3
(0.102 – 0.305)
(0.229 – 0.330)
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
S28 (WIDE) 0502
2. DRAWING NOT TO SCALE
3. 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
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
RELATED PARTS
PART NUMBER
LT®1137A
LTC1327
DESCRIPTION
COMMENTS
5V, 3 Driver, 5 Receiver RS232 Transceiver
3.3V, 3 Driver, 5 Receiver RS562 Transceiver
5V, 3 Driver, 5 Receiver RS232 Transceiver
3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver
±15kV ESD per IEC 1000-4
300µA Supply Current, 0.2µA in Shutdown
300µA Supply Current, 1µA in Shutdown
LTC1337
LTC1348
True RS232 on 3.3V, 5 Receivers Active in Shutdown
1349fa
LW/TP 1102 1K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
■
(408) 432-1900 FAX: (408) 434-0507 ■ WWW.linear.com
LINEAR TECHNOLOGY CORPORATION 1993
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