LINER LTC1350IG

LTC1350
3.3V Low Power
EIA/TIA-562 3-Driver/
5-Receiver Transceiver
U
DESCRIPTIO
FEATURES
■
■
■
■
■
■
■
■
■
■
Low Supply Current
300µA
Receivers 4 and 5 Kept Alive
in SHUTDOWN
35µA
ESD Protection
±10kV
Operates from a Single 3.3V 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
EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
Flowthrough Architecture
The LTC1350 is a 3-driver/5-receiver EIA/TIA-562 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 only 35µA. All RS232 outputs
assume a high impedance state in SHUTDOWN or with
the power off.
The LTC1350 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120k baud with a 1000pF and 3kΩ
load. Both driver outputs and receiver inputs can be
forced to ±25V without damage and can survive multiple
±10kV ESD strikes.
UO
APPLICATI
■
Notebook Computers
Palmtop Computers
UO
■
S
TYPICAL APPLICATI
V+
1
2
28
V–
C2 +
3
26
C2 –
C1–
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
LTC1350
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
600
500
85
TEST CONDITION: VCC = 3.3V
ALL DRIVER INPUTS TIED TO VCC
400
75
65
QUIESCENT
CURRENT
55
300
45
200
100
SHUTDOWN CURRENT
SHUTDOWN CURRENT (µA)
27
C1+
VCC
Quiescent and Shutdown Supply Current vs Temperature
QUIESCENT CURRENT (µA)
3-Drivers/5-Receivers with Shutdown
35
DR3 IN
RX5 OUT
GND
NC
NC
0
–40 –20
40
20
60
0
TEMPERATURE (˚C)
80
0
100
LTC1350 • TA02
LTC1350 • TA01
1
LTC1350
W
U
U
W W
W
AXI U
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ABSOLUTE
PACKAGE/ORDER I FOR ATIO
RATI GS
Supply Voltage (VCC) ................................................ 5V
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 (LTC1350C) ........................ 0°C to 70°C
Industrial (LTC1350I) ........................ – 40°C to 85°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
LTC1350CG
LTC1350CN
LTC1350CS
LTC1350IG
LTC1350IN
LTC1350IS
18 RX5 OUT
RX5 IN 12
17 GND
ON/OFF 13
16 NC
NC 14
15 NC
N PACKAGE
G PACKAGE
28-LEAD PLASTIC DIP
28-LEAD SSOP
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 Military grade parts
DC ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
Any Driver
Output Voltage Swing
3k to GND
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
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
MIN
TYP
●
●
3.7
– 3.7
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
VIN = VCC
VIN = 0V
VOUT = 0V
SHUTDOWN (Note 3), VOUT = ±20V
●
●
2.0
4.5
– 4.5
1.4
1.4
Input Low Threshold
Input High Threshold
●
●
0.8
●
0.1
3
VIN = ±10V
Output Low, IOUT = – 1.6mA (VCC = 3.3V)
Output High, IOUT = 160µA (VCC = 3.3V)
Sinking Current, VOUT = VCC
SHUTDOWN (Note 3), 0V ≤ VOUT ≤ VCC
Positive
Negative
±10
10
●
0.8
5
–5
●
●
●
●
MAX
3.0
–3
1.3
1.7
0.4
5
0.2
3.2
– 20
1
500
2.4
1
7
0.4
10
UNITS
V
V
V
V
µA
µA
mA
µA
V
V
V
kΩ
V
V
mA
µA
LTC1350
DC ELECTRICAL CHARACTERISTICS VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Power Supply Generator
V + Output Voltage
V – Output Voltage
Supply Rise Time
Power Supply
VCC Supply Current
CONDITIONS
IOUT = 0mA
IOUT = 5mA
IOUT = 0mA
IOUT = – 5mA
SHUTDOWN to Turn-On
AC CHARACTERISTICS
Driver Propagation Delay
(TTL to EIA/TIA-562)
Receiver Propagation Delay
(EIA/TIA-562 to TTL)
TYP
MAX
5.7
5.5
– 5.3
– 5.0
0.2
No Load (All Drivers VIN = VCC)(Note 2) 0°C ≤ TA ≤ 70°C
No Load (All Drivers VIN = 0)(Note 2) 0°C ≤ TA ≤ 70°C
No Load (All Drivers VIN = VCC)(Note 2) – 40°C ≤ TA ≤ 85°C
No Load (All Drivers VIN = 0)(Note 2) – 40°C ≤ TA ≤ 85°C
SHUTDOWN (Note 3)
ON/OFF Threshold Low
ON/OFF Threshold High
PARAMETER
Slew Rate
MIN
●
●
●
●
●
●
●
2.0
UNITS
V
V
V
V
ms
0.3
0.5
0.3
0.5
35
1.4
1.4
0.6
1.0
1.0
1.5
50
0.8
TYP
8
5
2
2
0.3
0.3
MAX
30
mA
mA
mA
mA
µA
V
V
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
CONDITIONS
RL = 3k, CL = 51pF
RL = 3k, CL = 1000pF
t HLD (Figure 1)
t LHD (Figure 1)
t HLR (Figure 2)
t LHR (Figure 2)
The ● denotes specifications which apply over the operating temperature
range of 0°C ≤ TA ≤ 70°C for commercial grade, – 40°C ≤ TA ≤ 85°C for
Industrial grade.
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
MIN
3
●
●
●
●
3.5
3.5
0.8
0.8
UNITS
V/µs
V/µs
µs
µs
µs
µs
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
Note 3: Supply current measurement in SHUTDOWN mode is performed
with VON/OFF = 0V.
3
LTC1350
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TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Input Thresholds
vs Temperature
Driver Output Voltage
vs Temperature
VCC = 3.3V
OUTPUT HIGH
2
1
0
ALL DRIVERS WITH LOAD, RL = 3k
–1
–2
VCC = 3.3V
OUTPUT LOW
–3
–4
–5
–40 –20
40
20
0
60
TEMPERATURE (°C)
30
2.0
25
1.8
VTH+
1.6
VTH–
1.4
80
1.0
–40 –20
100
SUPPLY CURRENT (mA)
LEAKAGE CURRENT (µA)
RL = 3k
3 DRIVERS LOADED
3.5
3.0
2.5
RL = 3k
1 DRIVER LOADED
1.5
80
14
35
30
25
VOUT = –20V
20
15
5
100
VOUT = 20V
0
10
30
20
40
50
TEMPERATURE (°C)
SHORT-CIRCUIT CURRENT (mA)
60
70
ISC–
20
8
ISC+
6
4
0
–40 –20
0
40
60
20
TEMPERATURE (˚C)
80
100
LTC1350 • TPC06
Receiver Output Waveform
RECEIVER
OUTPUT
CL = 50pF
DRIVER
OUTPUT
RL = 3k
25
ISC–
10
Driver Output Waveforms
DRIVER
OUTPUT
RL = 3k
CL = 1000pF
30
140
12
LTC1350 • TPC05
Receiver Short-Circuit Current
vs Temperature
35
120
2
0
LTC1350 • TPC04
40
80 100
60
40
DATA RATE (k Baud)
Driver Short-Circuit Current
vs Temperature
40
0.5
80
20
LTC1350 • TPC03
16
10
40
20
0
60
TEMPERATURE (°C)
0
100
45
1.0
0
–40 –20
10
Driver Leakage in Shutdown
vs Temperature
5.0
2.0
15
LT1350 • TPC02
VCC Supply Current
vs Temperature
4.0
20
0
40
20
60
0
TEMPERATURE (˚C)
LTC1350 • TPC01
4.5
VCC = 3.3V
RL = 3k
CL = 2500pF
3 DRIVERS ACTIVE
5
1.2
SHORT-CIRCUIT CURRENT (mA)
3
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
4
Supply Current vs Data Rate
2.2
SUPPLY CURRENT (mA)
5
INPUT
15
INPUT
10
ISC+
5
0
–40 –20
0
40
60
20
TEMPERATURE (˚C)
LTC1350 • TPC08
80
100
LTC1350 • TPC07
4
LTC1350 • TPC09
LTC1350
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PI FU CTIO S
VCC: 3.3V 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 the SHUTDOWN mode with receivers 4 and 5 kept alive and the supply current equal to 35µA.
All driver and other receiver outputs are in high impedance
state. This pin cannot float.
V +: Positive Supply Output. V + ≅ 2VCC – 1V. 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 be paralleled into
common capacitors. For a large number of devices, increasing the size of the shared common storage capacitors is recommended to reduce ripple.
V –: Negative Supply Output. V – ≅ – (2VCC – 1.3V). 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.
DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the 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.
U
W
W
SWITCHI G TI E WAVEFOR S
DR
INPUT
VCC
1.4V
1.4V
0V
V+
DR
OUTPUT
0V
0V
t LHD
V–
RX
OUTPUT
1.3V
0V
2.4V
0.8V
t LHR
t HLD
VCC
1.7V
RX
INPUT
t HLR
LTC1350 • F01
Figure 1. Driver Propagation Delay Timing
VCC
0V
LTC1350 • F02
Figure 2. Receiver Propagation Delay Timing
5
LTC1350
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
INPUT
RX
OUTPUT
DRIVER
OUTPUT
RX INPUT
DRIVER
51pF
RX
51pF
3k
LTC1350 • TA04
LTC1350 • TA03
ESD Test Circuit
V+
C1
0.1µF
VCC
C2
0.1µF
DR1 OUT
RX1 IN
RS232
LINE PINS
PROTECTED
TO ±10kV
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
28
1
2
LTC1350
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
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
LTC1350 • TC
6
LTC1350
PACKAGE DESCRIPTIO
U
Dimensions in inches (millimeters) unless otherwise noted.
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 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
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
1 2 3 4 5 6 7 8 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
0.600 – 0.625
(15.240 – 15.875)
0.009 – 0.015
(0.229 – 0.381)
(
0.130 ± 0.005
(3.302 ± 0.127)
+0.635
15.87
–0.381
0.045 – 0.065
(1.143 – 1.651)
0.015
(0.381)
MIN
+0.025
0.625 –0.015
)
1.455
(36.957)
MAX
0.070
(1.778)
TYP
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
0.505 – 0.560
(12.827 – 14.224)
0.125
(3.175)
MIN
0.035 – 0.080
(0.889 – 2.032)
0.018 ± 0.003
(0.457 ± 0.076)
0.100 ± 0.010
(2.540 ± 0.254)
S Package
28-Lead Plastic SOL
0.005
(0.127)
RAD MIN
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
0.010 – 0.029 × 45°
(2.362 – 2.642)
(0.254 – 0.737)
0.697 – 0.712
(17.70 – 18.08)
(NOTE 2)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330) NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
NOTE:
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.
0.004 – 0.012
(0.102 – 0.305)
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
1
2
3
4
5
6
7
8
9 10 11 12 13 14
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LTC1350
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
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
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
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
GERMANY
Linear Techonolgy GMBH
Untere 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
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.
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
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
LT/GP 1293 10K REV 0 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1993