LINER LTC1337 5v low power rs232 3-driver/5-receiver transceiver Datasheet

LTC1337
5V Low Power RS232
3-Driver/5-Receiver Transceiver
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DESCRIPTIO
FEATURES
■
■
■
■
■
■
■
■
■
■
■
Low Supply Current: 300µA
1µA Supply Current 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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APPLICATI
■
In SHUTDOWN mode, the supply current is further reduced to 1µA. All RS232 outputs assume a high impedance state in SHUTDOWN and with the power off.
The LTC1337 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 1000pF// 3kΩ load. Both
driver outputs and receiver inputs can be forced to ±25V
without damage, and can survive multiple ±10kV ESD
strikes.
Notebook Computers
Palmtop Computers
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■
S
The LTC1337 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 and can supply up to 12mA
of extra current to power external circuitry.
TYPICAL APPLICATI
V+
VCC
C2
0.1µF
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/OFF
2
LTC1337
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
600
1.2
500
1.0
400
GND
0.6
300
0.4
200
SHUTDOWN
CURRENT
100
0
RX5 OUT
0.8
QUIESCENT
CURRENT
–20
0
20
40
60
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
C1
0.1µF
28
1
Supply Current
QUIESCENT CURRENT OPERATING (µA)
3-Drivers/5-Receivers with SHUTDOWN
0.2
80
0
TEST CONDITION:
VCC = 5V, ALL DRIVER INPUTS TIED TO VCC
1337 TA01
1337 TA02
1
LTC1337
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RATI GS
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AXI U
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ABSOLUTE
PACKAGE/ORDER I FOR ATIO
(Note 1)
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 (LTC1337C) ........................ 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
TOP VIEW
V+ 1
28 V –
VCC 2
27 C2 +
C1+
3
26 C2 –
C1–
4
25 DR1 IN
DR1 OUT 5
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
LTC1337CG
LTC1337CN
LTC1337CS
18 RX5 OUT
RX5 IN 12
17 GND
ON/OFF 13
16 NC
NC 14
15 NC
G PACKAGE
N PACKAGE
28-LEAD SSOP
28-LEAD PLASTIC DIP
S PACKAGE
28-LEAD PLASTIC SOL
TJMAX = 125°C, θJA = 96°C/W (G)
TJMAX = 125°C, θJA = 56°C/W (N)
TJMAX = 125°C, θJA = 85°C/W (S)
Consult factory for Industrial and Military grade parts.
DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Any Driver
Output Voltage Swing
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
2
CONDITIONS
RL = 3k to GND
RL = 3k to GND
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
VIN = 5V
VIN = 0
VOUT = 0V
SHUTDOWN, VOUT = ±20V (Note 3)
Input Low Threshold
Input High Threshold
Output Low, IOUT = – 1.6mA (VCC = 5V)
Output High, IOUT = 160µA (VCC = 5V)
Sourcing Current, VOUT = 0
Sinking Current, VOUT = VCC
SHUTDOWN, 0 ≤ VOUT ≤ VCC (Note 3)
Positive
Negative
MIN
TYP
●
●
5.0
– 5.0
●
●
2.0
7.0
– 6.5
1.4
1.4
±10
10
●
●
●
0.8
●
0.1
3
●
0.8
5
–5
●
●
●
●
MAX
3.5
15
– 15
1.3
1.7
0.4
5
0.2
4.8
20
– 40
1
200
2.4
1
7
0.4
10
UNITS
V
V
V
V
µA
µA
mA
µA
V
V
V
kΩ
V
V
mA
mA
µA
LTC1337
DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Power Supply Generator
V + Output Voltage
CONDITIONS
MIN
IOUT = 0mA
IOUT = 12mA
IOUT = 0mA
IOUT = 12mA
SHUTDOWN to Turn-On
V – Output Voltage
Supply Rise Time
Power Supply
VCC Supply Current
Supply Leakage Current (VCC)
On/Off Threshold Low
On/Off Threshold High
TYP
MAX
UNITS
8.0
7.5
– 8.0
– 6.5
0.2
No Load (Note 2)
SHUTDOWN (Note 3)
●
●
●
2.0
●
V
V
V
V
ms
0.3
1
1.4
1.4
0.5
10
0.8
TYP
8
4
2
2
0.3
0.2
MAX
30
mA
µA
V
V
AC CHARACTERISTICS
PARAMETER
Slew Rate
CONDITIONS
RL = 3k, CL = 51pF
RL = 3k, CL = 2500pF
t HLD (Figure 1)
t LHD (Figure 1)
t HLR (Figure 2)
t LHR (Figure 2)
Driver Propagation Delay
(TTL to RS232)
Receiver Propagation Delay
(RS232 to TTL)
MIN
2
●
●
●
●
The ● denotes specifications which apply over the operating temperature
range (0°C ≤ TA ≤ 70°C).
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
UNITS
V/µs
V/µs
µs
µs
µs
µs
3
3
0.6
0.6
Note 2: Supply current is measured with driver and receiver outputs
unloaded and driver inputs tied high.
Note 3: Supply current and leakage measurements in SHUTDOWN are
performed with VON = 0V.
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TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
Receiver Input Thresholds
RL = 3k
OUTPUT HIGH
VCC = 5V
6
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
8
VCC = 4.5V
4
2
0
–2
OUTPUT LOW
–4
VCC = 4.5V
–6
Supply Current vs Data Rate
2.0
45
1.9
40
1.8
INPUT HIGH
SUPPLY CURRENT (mA)
10
1.7
1.6
1.5
INPUT LOW
1.4
1.3
–8
0
10
30
20
40
50
TEMPERATURE (°C)
70
1337 G01
30
25
20
15
10
0
1.1
60
35
5
1.2
VCC = 5V
VCC = 5V
RL = 3k
CL = 2500pF
3 DRIVERS ACTIVE
0
10
30
20
40
50
TEMPERATURE (°C)
60
70
1337 G02
0
25
75 100 125
50
DATA RATE (k BAUD)
150
175
1337 G03
3
LTC1337
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TYPICAL PERFOR A CE CHARACTERISTICS
Driver Leakage in SHUTDOWN
Driver Short-Circuit Current
20
16
40
18
14
3 DRIVERS LOADED
RL = 3k
12
10
8
1 DRIVER LOADED
RL = 3k
6
4
35
30
25
15
10
2
0
0
30
20
40
50
TEMPERATURE (°C)
10
60
VOUT = –20V
20
5
0
SHORT-CIRCUIT CURRENT (mA)
45
LEAKAGE CURRENT (µA)
SUPPLY CURRENT (mA)
VCC Supply Current
20
VOUT = 20V
14
12
ISC–
10
ISC+
8
6
4
2
0
70
16
10
30
20
40
50
TEMPERATURE (°C)
60
70
0
10
30
20
40
50
TEMPERATURE (°C)
1337 G05
1337 G04
70
1337 G06
Driver Output Waveforms
Receiver Short-Circuit Current
60
Receiver Output Waveforms
55
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
SHORT-CIRCUIT CURRENT (mA)
50
45
ISC–
40
RX
OUTPUT
CL = 50pF
DRIVER
OUTPUT
RL = 3k
35
INPUT
30
+
ISC
25
INPUT
20
15
10
0
10
30
20
40
50
TEMPERATURE (°C)
60
70
1337 G07
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PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current less than 1µA in
the SHUTDOWN mode. This pin should be decoupled with
a 0.1µF ceramic capacitor.
leled into common capacitors. For large numbers of
devices, 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
–1.5V). This pin requires an external capacitor C = 0.1µF
for charge storage.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the SHUTDOWN mode which
reduces input supply current to less than 1µA and places
all drivers and receivers in high impedance state.
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 paral-
4
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 50Ω.
LTC1337
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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. Outputs are in a high impedance state when in SHUTDOWN mode to allow data line sharing.
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SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
VCC
1.4V
0V
0V
t LHD
1.3V
0V
V+
DRIVER
OUTPUT
VCC
1.7V
RX IN
1.4V
V–
VCC
RX
OUTPUT
0V
0.8V
t LHR
t HLD
0V
0V
t HLR
1337 F02
1337 F01
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
DRIVER
INPUT
ESD Test Circuit
DRIVER
OUTPUT
DRIVER
51pF
V+
3k
C1
0.1µF
VCC
C2
0.1µF
1337 F03
Figure 3. Driver Timing Test Load
DRIVER 1 OUT
RX1 IN
RS232
LINE PINS
PROTECTED
TO ±10kV
RX
OUTPUT
RX IN
DRIVER 2 OUT
RX2 IN
RX3 IN
RX4 IN
RX
51pF
DRIVER 3 OUT
RX5 IN
ON/OFF
1337 F04
28
1
2
LTC1337
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
1337 TC01
Figure 4. Receiver Timing Test Load
5
LTC1337
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TYPICAL APPLICATI
S
Operation Using 5V and 12V Power Supplies
+
12V V +
0.01µF
0.01µF
1
C1+
3
26
C1–
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
DRIVER OUT
RX IN
DRIVER OUT
RX IN
TO LINE
RX IN
RX IN
DRIVER OUT
RX IN
ON/0FF = 5V
2
28
LTC1337
27
V–
C2 +
0.1µF
C2 –
DRIVER IN
+
5V VCC
V+
VCC
0.1µF
RX OUT
DRIVER IN
RX OUT
TO LOGIC
RX OUT
RX OUT
DRIVER IN
RX OUT
GND
1337 TA03
Typical Mouse Driving Application
0.1µF
MOUSE
5V VCC
LOGIC
(1)
OPTICS
DB9
3
26
24 RX OUT
DCD
RX IN
6
23 DRIVER IN
DSR
DRIVER OUT
7
22 RX OUT
RX
RX IN
8
21 RX OUT
RTS
RX IN
9
20 RX OUT
RI
RX IN 10
DRIVER OUT 11
RX IN 12
0.1µF
0.1µF
25 DRIVER IN
DTR
(9)
C2 +
27
5
CTS
(5)
V–
4
TX
V–
0.1µF
LTC1337
DRIVER OUT
C1–
V+
6
2
C1+
28
1
19 DRIVER IN
+
V+
+
C2 –
LOGIC “0”
LOGIC “0”
MOUSE DATA
LOGIC “1”
18 RX OUT
17 GND
ON/OFF 13
16
14
15
1137 TA04
LTC1337
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PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise notes.
G Package
28-Lead SSOP
0.397 – 0.407
(10.07 – 10.33)
0.205 – 0.212
(5.20 – 5.38)
0.066 – 0.070
(1.68 – 1.78)
PARTING
LINE
0.068 – 0.078
(1.73 – 1.99)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0° – 8°
0.005 – 0.009
(0.13 – 0.22)
0.301 – 0.311
(7.65 – 7.90)
0.045
(1.14)
0.0256
(0.65)
BSC 0.010 – 0.015
(0.25 – 0.38)
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.045
(1.14)
N Package
28-Lead Plastic DIP
0.600 – 0.625
(15.240 – 15.875)
95° ± 5°
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.625
–0.015
+0.635
15.87
–0.381
(
0.020
(0.508)
TYP
0.130 ± 0.005
(3.302 ± 0.127)
0.070
(1.778)
TYP
0.045 – 0.055
(1.143 – 1.651)
0.020
(0.508)
MIN
27
26
25
24
23
1
2
3
4
5
6
20
19
18
17
16
15
9
10
11
12
13
14
0.505 – 0.560
(12.827 – 14.224)
0.125
(3.175)
MIN
)
28
1.455
(36.957)
MAX
22 21
0.035 – 0.080
(0.889 – 2.032)
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
7
8
S Package
28-Lead SOL
0.291 – 0.299
(7.391 – 7.595)
0.005
(0.127)
RAD MIN
0.093 – 0.104
(2.362 – 2.642)
0.010 – 0.029 × 45°
(0.254 – 0.737)
0.697 – 0.712
(17.70 – 18.08)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.050
0.014 – 0.019
0.009 – 0.013
(1.270)
(0.356 – 0.482)
(0.229 – 0.330) SEE NOTE
TYP
0.016 – 0.050
(0.406 – 1.270)
NOTE:
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.
0.004 – 0.012
(0.102 – 0.305)
SEE
NOTE
0.394 – 0.419
(10.007 – 10.643)
1
2
3
4
5
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.
6
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LTC1337
U.S. Area Sales Offices
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
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Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
SOUTHWEST REGION
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Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Phone: (508) 658-3881
FAX: (508) 658-2701
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
International Sales Offices
FRANCE
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Phone: 33-1-41079555
FAX: 33-1-46314613
KOREA
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
Phone: 82-2-792-1617
FAX: 82-2-792-1619
GERMANY
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Hauptstr. 9
D-85386 Eching
Germany
Phone: 49-89-3197410
FAX: 49-89-3194821
SINGAPORE
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Phone: 65-293-5322
FAX: 65-292-0398
TAIWAN
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
UNITED KINGDOM
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Phone: 44-276-677676
FAX: 44-276-64851
JAPAN
Linear Technology KK
5F YZ Bldg.
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
8
Linear Technology Corporation
LT/GP 0893 10K REV 0 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
 LINEAR TECHNOLOGY CORPORATION 1993
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