LINER LTC1386IS

LTC1386
3.3V Low Power
EIA/TIA562 Transceiver
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FEATURES
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DESCRIPTIO
The LTC®1386 is an ultra-low power 2-driver/2-receiver EIA/TIA562 transceiver that operates from a
single 3.3V supply. The charge pump requires only four
space-saving 0.1µF capacitors. The supply current
(ICC) of the transceiver is only 200µA with driver outputs unloaded.
Operates from a Single 3.3V Supply
Low Supply Current: ICC = 200µA
ESD Protection Over ±10kV
Available in 16-Pin SOIC Narrow Package
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
EIA/TIA562 I/O Lines Can Be Forced to ±25V
Without Damage
Pin Compatible with LT1181A
The LTC1386 is fully compliant with all data rate and
overvoltage EIA/TIA562 specifications. The transceiver
can operate up to 120kbaud 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.
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APPLICATIO S
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Notebook Computers
Palmtop Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATIO
Quiescent Supply Current vs Temperature
16
3
2
4
0.1µF
LOGIC INPUT
5
LTC1386
600
500
0.1µF
6
0.1µF
VCC
300k
11
14
562 OUTPUT
VCC
300k
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
10
7
12
13
5k
5k
562 OUTPUT
400
QUIESCENT
CURRENT
300
200
100
562 INPUT
0
–20
8
9
TEST CONDITION: VCC = 3.3V
VCC = 3.3V
QUIESCENT CURRENT (µA)
0.1µF
1
562 INPUT
0
20
40
TEMPERATURE (°C)
60
80
LTC1386 • TA02
15
LTC1386 • TA01
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LTC1386
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ABSOLUTE
RATI GS
Supply Voltage (VCC) ................................................ 5V
Input Voltage
Driver ....................................... – 0.3V to V CC + 0.3V
Receiver ............................................... – 25V to 25V
Digital Input ............................... – 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
LTC1386C ............................................... 0°C to 70°C
LTC1386I ............................................ – 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
ORDER PART
NUMBER
TOP VIEW
C1+
1
16 VCC
+
2
15 GND
C1–
3
14 TR1 OUT
C2+
4
13 RX1 IN
C2 –
5
12 RX1 OUT
–
6
11 TR1 IN
TR2 OUT
7
10 TR2 IN
RX2 IN
8
9
V
V
LTC1386CS
LTC1386IS
RX2 OUT
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 95°C/W
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 = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
Any Driver
Output Voltage Swing
3k to GND
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Any Receiver
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Voltage
Output Short-Circuit Current
Power Supply Generator
V + Output Voltage
V – Output Voltage
Power Supply
VCC Supply Current
MIN
TYP
●
●
3.7
– 3.7
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
VIN = VCC
VIN = 0V
VOUT = 0V
●
●
2.0
4.5
– 4.5
1.4
1.4
Input Low Threshold
Input High Threshold
●
●
0.8
●
0.1
3
– 10V ≤ VIN ≤ 10V
Output Low, IOUT = – 1.6mA (VCC = 3.3V)
Output High, IOUT = 160µA (VCC = 3.3V)
Sinking Current, VOUT = VCC
Sourcing Current, VOUT = GND
Positive
Negative
●
●
±9
●
●
IOUT = 0mA
IOUT = 5mA
IOUT = 0mA
IOUT = – 5mA
No Load (Note 2), 0°C to 70°C
No Load (Note 2), – 40°C to 85°C
3.0
–5
2
– 20
±10
1.3
1.7
0.4
5
0.2
3.2
– 20
7
MAX
0.8
5
– 40
2.4
1
7
0.4
5.7
5.5
– 5.3
– 5.0
●
●
0.2
0.35
UNITS
V
V
V
V
µA
µA
mA
V
V
V
kΩ
V
V
mA
mA
V
V
V
V
0.5
1.0
mA
mA
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LTC1386
AC CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range.
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Slew Rate
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)
Driver Propagation Delay
(TTL to EIA/TIA562)
Receiver Propagation Delay
(EIA/TIA562 to TTL )
MIN
3
●
●
●
●
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.
TYP
8
5
2
2
0.3
0.3
MAX
30
UNITS
V/µs
V/µs
µs
µs
µs
µs
3.5
3.5
0.8
0.8
Note 3: Measurements made in the shutdown mode are performed
with VON/OFF=OV.
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TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
5
OUTPUT HIGH
VCC = 3.3V
2
1
ALL DRIVERS WITH LOAD
RL = 3k
0
–1
–2
OUTPUT LOW
VCC = 3.3V
–3
–4
10
40
30
20
50
TEMPERATURE (°C)
1.8
VTH+
1.6
1.4
VTH–
60
70
0
10
40
50
30
20
TEMPERATURE (˚C)
60
70
2 DRIVERS LOADED
RL = 3k
40
80 100
60
DATA RATE (kBAUD)
120
140
LTC1386 • TPC03
RECEIVER
OUTPUT
CL = 51pF
DRIVER
OUTPUT
RL = 3k
2.5
20
Receiver Output Waveforms
DRIVER
OUTPUT
RL = 3k
CL = 1000pF
4.0
1 DRIVER LOADED
RL = 3k
1.5
0
Driver Output Waveforms
4.5
2.0
5
LTC1386 • TPC02
VCC Supply Current
vs Temperature
3.0
10
0
1.0
LTC1386 • TPC01
3.5
15
1.2
–5
0
VCC = 3.3V
RL = 3k
CL = 2500pF
ALL DRIVERS ACTIVE
2.0
SUPPLY CURRENT (mA)
3
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
4
SUPPLY CURRENT (mA)
Supply Current vs Data Rate
20
2.2
INPUT
INPUT
1.0
LTC1386 • TPC05
0.5
5µs/DIV
LTC1386 • TPC06
5µs/DIV
0
0
10
20
30
40
50
TEMPERATURE (°C)
60
70
LTC1386 • TPC04
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LTC1386
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PI FU CTIO S
VCC: 3.3V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor.
charge pump efficiency, the capacitor’s effective series
resistance should be less than 2Ω.
GND: Ground Pin.
TR IN: EIA/TIA562 Driver Input Pins. Inputs are TTL/
CMOS compatible. The inputs of unused drivers can be left
unconnected since 300k input pull-up resistors to VCC are
included on chip.
V +:
V+
Positive Supply Output (EIA/TIA562 Drivers).
≅
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 share a common capacitor. For large numbers of
devices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
TR OUT: Driver Outputs at EIA/TIA562 Voltage Levels.
The driver outputs are protected against ESD to ±10kV for
human body model discharges.
V –: Negative Supply Output (RS232 Drivers). V – ≅ – (2VCC
– 1.3V). This pin requires an external capacitor C = 0.1µF
for charge storage.
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.
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
RX OUT: Receiver Outputs with TTL/CMOS Voltage
Levels.
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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
LTC1386 • 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
LTC1386 • F02
Figure 2. Receiver Propagation Delay Timing
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LTC1386
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
INPUT
RX
OUTPUT
DRIVER
OUTPUT
RX INPUT
DRIVER
51pF
RX
51pF
3k
LTC1386 • TA04
LTC1386 • TA03
ESD Test Circuit
16
1
0.1µF
LTC1386
3
LOGIC INPUT
5 VCC
LOGIC OUTPUT
LOGIC OUTPUT
0.1µF
300k
14
11
VCC
LOGIC INPUT
0.1µF
562 OUTPUT
300k
10
7
12
13
9
VCC
6
4
0.1µF
2
5k
5k
8
562 OUTPUT
562 INPUT
RS562
LINE PINS
PROTECTED
TO ±10kV
562 INPUT
15
1386 TA05
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LTC1386
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TYPICAL APPLICATIO S
Paralleling Power Supply Generator
with Common Storage Capacitors
0.1µF
1
16
3
2
4
0.1µF
LOGIC INPUT
5
LTC1386
VCC = 3.3V
0.1µF
6
0.1µF
VCC
300k
14
11
0.1µF
562 OUTPUT
1
16
3
2
4
0.1µF
LOGIC INPUT
5
LOGIC OUTPUT
LOGIC OUTPUT
6
VCC
300k
11
VCC
300k
LOGIC INPUT
LTC1386
VCC = 3.3V
562 OUTPUT
VCC
300k
10
7
12
13
5k
8
9
5k
15
562 OUTPUT
LOGIC INPUT
562 INPUT
LOGIC OUTPUT
562 INPUT
LOGIC OUTPUT
10
7
12
13
5k
9
5k
562 OUTPUT
562 INPUT
562 INPUT
15
LTC1386 • TA06
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LTC1386
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PACKAGE DESCRIPTIO
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.386 – .394
(9.804 – 10.008)
NOTE 3
.045 ±.005
.050 BSC
16
N
15
14
13
12
11
10
9
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
.030 ±.005
TYP
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.010 – .020
× 45°
(0.254 – 0.508)
2
3
4
5
6
.053 – .069
(1.346 – 1.752)
.008 – .010
(0.203 – 0.254)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
8
.004 – .010
(0.101 – 0.254)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
7
.050
(1.270)
BSC
S16 0502
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
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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.
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LTC1386
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1780/LT1781
5V, 2 Driver, 2 Receiver RS232 Transeivers
±15kV ESD per IEC 1000-4
LTC1327
3.3V, 3 Driver, 5 Receiver RS562 Transceiver
300µA Supply Current, 0.2µA in Shutdown
LTC1348
3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver
True RS232 on 3.3V, 5 Receivers Active in Shutdown
LTC1382
5V, 2 Driver, 2 Receiver RS232 Transceiver
220µA Supply Current, 0.2µA in Shutdown
LTC1383
5V, 2 Driver, 2 Receiver RS232 Transceiver
220µA Supply Current, Narrow 16-pin SO
LTC1384
5V, 2 Driver, 2 Receiver RS232 Transceiver
220µA Supply Current, 2 Receivers Active in Shutdown
LTC1385
3.3V, 2 Driver, 2 Receiver RS562 Transceiver
220µA Supply Current, 2 Receivers Active in Shutdown
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Linear Technology Corporation
LW/TP 1002 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● linear.com
 LINEAR TECHNOLOGY CORPORATION 1994