LINER LTC1349CSW 5v low power rs232 3-driver/5-receiver transceiver with 2 receivers active in shutdown Datasheet

LTC1349
5V Low Power RS232
3-Driver/5-Receiver Transceiver
with 2 Receivers Active
in Shutdown
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FEATURES
■
■
■
■
■
■
■
■
■
■
■
DESCRIPTIO
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
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APPLICATIO S
■
■
Notebook Computers
Palmtop Computers
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.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Quiescent and Shutdown Supply Current
vs Temperature
3-Drivers/5-Receivers with Shutdown
VCC
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
NC
2
28
LTC1349
V–
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C3
0.1µF
C4
0.1µF
1200
60
1000
50
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
SHUTDOWN
CURRENT
800
40
30
600
QUIESCENT
CURRENT
400
20
SHUTDOWN CURRENT (µA)
C2
0.1µF
1
QUIESCENT CURRENT (µA)
V+
C1
0.1µF
10
200
DRIVER 3 IN
RX5 OUT
0
0
80 100
20
60
40
TEMPERATURE (°C)
TEST CONDITION:
VCC = 5V, ALL DRIVER INPUTS TIED TO VCC.
0
–40
GND
NC
NC
LTC1349 • TA01
–20
LTC1349 • TA02
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LTC1349
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ABSOLUTE
RATI GS
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Driver ....................................... – 0.3V to V CC + 0.3V
Receiver ............................................... – 25V to 25V
On/Off Pin .................................. – 0.3V to VCC + 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short Circuit Duration
V + ................................................................... 30 sec
V – ................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
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
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
V+ 1
28 V–
VCC 2
27 C2+
C1+ 3
26 C2–
C1– 4
25 DR1 IN
DR1 OUT 5
ORDER PART
NUMBER
LTC1349CG
LTC1349CNW
LTC1349CSW
LTC1349IG
LTC1349INW
LTC1349ISW
24 RX1 OUT
RX1 IN 6
23 DR2 IN
DR2 OUT 7
22 RX2 OUT
RX2 IN 8
21 RX3 OUT
RX3 IN 9
20 RX4 OUT
RX4 IN 10
19 DR3 IN
DR3 OUT 11
18 RX5 OUT
RX5 IN 12
17 GND
ON/OFF 13
16 NC
NC 14
15 NC
NW PACKAGE
28-LEAD PDIP
G PACKAGE
28-LEAD SSOP
SW PACKAGE
28-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 96°C/W (G)
TJMAX = 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
Any Driver
Output Voltage Swing
CONDITIONS
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Any Receiver
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Voltage
Output Short-Circuit Current
Output Leakage Current
Power Supply Generator
V + Output Voltage
V – Output Voltage
Supply Rise Time
MIN
TYP
●
●
5.0
– 5.0
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
VIN = 5V
VIN = 0V
VOUT = 0V
●
●
2.0
7.0
– 6.5
1.4
1.4
Shutdown, VOUT = ±20V (Note 3)
●
Input Low Threshold
Input High Threshold
●
●
0.8
●
0.1
3
3k to GND
– 10V ≤ VIN ≤ 10V
Output Low, IOUT = – 1.6mA (VCC = 5V)
Output High, IOUT = 160µA (VCC = 5V)
Sinking Current, VOUT = VCC
Shutdown, 0 ≤ VOUT ≤ VCC (Note 3)
IOUT = 0mA
IOUT = 12mA
IOUT = 0mA
IOUT = – 12mA
Shutdown to Turn-On
Positive
Negative
±9
●
0.8
5
–5
●
●
●
●
MAX
±12
±10
3.5
– 15
1.3
1.7
0.4
5
0.2
4.8
– 40
1
8.0
7.5
– 8.0
– 7.0
0.2
±500
2.4
1.0
7
0.4
10
UNITS
V
V
V
V
µA
µA
mA
µA
V
V
V
kΩ
V
V
mA
µA
V
V
V
V
ms
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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
VCC Supply Current
CONDITIONS
No Load (All Drivers VIN = VCC)(Note 2), 0°C ≤ TA ≤ 70°C
No Load (All Drivers VIN = 0V)(Note 2), 0°C ≤ TA ≤ 70°C
No Load (All Drivers VIN = VCC)(Note 2), 0°C ≤ TA ≤ 85°C
No Load (All Drivers VIN = VCC)(Note 2), – 40°C ≤ TA ≤ 0°C
No Load (All Drivers VIN = 0V)(Note 2), – 40°C ≤ TA ≤ 85°C
Shutdown (Note 3)
Supply Leakage Current (VCC)
On/Off Threshold Low
On/Off Threshold High
MIN
TYP
MAX
UNITS
0.8
1.0
1.0
1.5
1.5
50
0.8
2.0
0.3
0.5
0.3
0.3
0.5
35
1.4
1.4
mA
mA
mA
mA
mA
µA
V
V
●
●
●
●
●
●
●
●
AC CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range.
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
PARAMETER
CONDITIONS
Slew Rate
RL = 3k, CL = 51pF
RL = 3k, CL = 2500pF
MIN
TYP
MAX
UNITS
8
5
30
3
V/µs
V/µs
Driver Propagation Delay
(TTL to RS232)
t HLD (Figure 1)
t LHD (Figure 1)
●
●
2
2
3.5
3.5
µs
µs
Receiver Propagation Delay
(RS232 to TTL)
t HLR (Figure 2)
t LHR (Figure 2)
●
●
0.3
0.2
0.8
0.8
µs
µs
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.
Note 3: Supply current and leakage current measurements in Shutdown
are performed with VON/OFF = 0V.
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TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
Receiver Input Thresholds
2.2
10
6
OUTPUT HIGH
VCC = 5V
VCC = 4.5V
2
0
–2
OUTPUT LOW
VCC = 4.5V
1.8
VTH
1.6
VTL
1.4
35
30
25
20
15
10
1.2
–6
5
VCC = 5V
–8
–40
VCC = 5V
RL = 3k
CL = 2500pF
3 DRIVERS ACTIVE
40
2.0
4
–4
45
SUPPLY CURRENT (mA)
RL = 3k
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
8
Supply Current vs Data Rate
–20
20
0
40
60
TEMPERATURE (°C)
80
100
LTC1349 • TPC01
1.0
–40 –20
40
20
60
0
TEMPERATURE (˚C)
80
100
LTC1349 • TPC02
0
0
25
75 100 125
50
DATA RATE (k BAUD)
150
175
LTC1349 • TPC03
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LTC1349
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TYPICAL PERFOR A CE CHARACTERISTICS
40
14
35
3 DRIVERS LOADED
RL = 3k
10
8
1 DRIVER LOADED
RL = 3k
6
4
2
20
18
30
25
VOUT = –20V
20
15
10
VOUT = 20V
5
0
SHORT-CIRCUIT CURRENT (mA)
16
12
Driver Short-Circuit Current
Driver Leakage in Shutdown
45
LEAKAGE CURRENT (µA)
SUPPLY CURRENT (mA)
VCC Supply Current
20
10
30
20
40
50
TEMPERATURE (°C)
60
70
0
10
30
20
40
50
TEMPERATURE (°C)
LTC1349 • TPC04
ISC+
12
10
8
6
60
70
0
–40
LTC1349 • TPC05
Receiver Short-Circuit Current
ISC–
14
4
0
0
16
–20
20
0
40
60
TEMPERATURE (°C)
80
100
LTC1349 • TPC06
Driver Output Waveforms
Receiver Output Waveforms
SHORT-CIRCUIT CURRENT (mA)
60
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
50
40
RECEIVER
OUTPUT
CL = 2500pF
DRIVER
OUTPUT
RL = 3k
ISC–
INPUT
30
INPUT
ISC+
20
LTC1349 • TPC08
10
–40 –20
40
20
0
60
TEMPERATURE (°C)
80
LTC1349 • TPC09
100
LTC1349 • TPC07
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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.
GND: Ground Pin.
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.
V +: Positive Supply Output (RS232 Drivers). V + ≅ 2VCC –
1V. This pin requires an external capacitor C = 0.1µF for
charge storage. The capacitor may be tied to ground or 5V.
With multiple devices, the V + and V – pins may be paralleled into common capacitors. For large numbers of devices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
V –: Negative Supply Output (RS232 Drivers). V – ≅ 2VCC –
1.5V. This pin requires an external capacitor C = 0.1µF for
charge storage.
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–. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.
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LTC1349
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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.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in Shutdown
mode or VCC = 0V. 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
without damage. The receiver inputs are protected against
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels. 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.
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SWITCHI G TI E WAVEFOR S
VCC
DRIVER
INPUT
1.4V
1.4V
0V
V+
DRIVER
OUTPUT
0V
0V
t LHD
V–
t HLD
LTC1349 • F01
Figure 1. Driver Propagation Delay Timing
VCC
1.7V
RX
INPUT
RX
OUTPUT
1.3V
0V
2.4V
0.8V
t LHR
t HLR
VCC
0V
LTC1349 • F02
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
Driver Timing Test Load
DRIVER
INPUT
Receiver Timing Test Load
DRIVER
OUTPUT
RX
OUTPUT
RX INPUT
DRIVER
51pF
3k
RX
51pF
LTC1349 • TA04
LTC1349 • TA03
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LTC1349
TEST CIRCUITS
ESD Test Circuit
V+
C1
0.1µF
VCC
C2
0.1µF
DRIVER 1 OUT
RX1 IN
RS232
LINE PINS
PROTECTED
TO ±10kV
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
NC
1
2
28
LTC1349
V–
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C3
0.1µF
C4
0.1µF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
NC
NC
LTC1349 • TC
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LTC1349
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PACKAGE DESCRIPTIO
G Package
28-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
9.90 – 10.50*
(.390 – .413)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
1.25 ±0.12
7.8 – 8.2
5.3 – 5.7
0.42 ±0.03
7.40 – 8.20
(.291 – .323)
0.65 BSC
1 2 3 4 5 6 7 8 9 10 11 12 13 14
RECOMMENDED SOLDER PAD LAYOUT
5.00 – 5.60**
(.197 – .221)
2.0
(.079)
0° – 8°
0.09 – 0.25
(.0035 – .010)
0.65
(.0256)
BSC
0.55 – 0.95
(.022 – .037)
0.05
(.002)
0.22 – 0.38
(.009 – .015)
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
G28 SSOP 0802
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
.505 – .560*
(12.827 – 14.224)
.600 – .625
(15.240 – 15.875)
.008 – .015
(0.203 – 0.381)
+.035
.625 –.015
(
15.87
+0.889
–0.381
NOTE:
1. DIMENSIONS ARE
)
.045 – .065
(1.143 – 1.651)
.150 ± .005
(3.810 ± 0.127)
.015
(0.381)
MIN
.070
(1.778)
TYP
.120
(3.175)
MIN
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.035 – .080
(0.889 – 2.032)
.100
(2.54)
BSC
.018 ± .003
(0.457 ± 0.076)
NW28 1002
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LTC1349
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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
17
16
15
N
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
1
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
.005
(0.127)
RAD MIN
.009 – .013
(0.229 – 0.330)
.291 – .299
(7.391 – 7.595)
NOTE 4
.010 – .029 × 45°
(0.254 – 0.737)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
.037 – .045
(0.940 – 1.143)
.093 – .104
(2.362 – 2.642)
0° – 8° TYP
.050
(1.270)
BSC
NOTE 3
.004 – .012
(0.102 – 0.305)
.014 – .019
(0.356 – 0.482)
TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
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)
S28 (WIDE) 0502
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT ®1137A
5V, 3 Driver, 5 Receiver RS232 Transceiver
±15kV ESD per IEC 1000-4
LTC1327
3.3V, 3 Driver, 5 Receiver RS562 Transceiver
300µA Supply Current, 0.2µA in Shutdown
LTC1337
5V, 3 Driver, 5 Receiver RS232 Transceiver
300µA Supply Current, 1µA in Shutdown
LTC1348
3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver
True RS232 on 3.3V, 5 Receivers Active in Shutdown
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Linear Technology Corporation
LW/TP 1102 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507
●
WWW.linear.com
 LINEAR TECHNOLOGY CORPORATION 1993
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