LINER LTC1385 3.3v low power eia/tia-562 transceiver Datasheet

LTC1385
3.3V Low Power
EIA/TIA-562 Transceiver
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FEATURES
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DESCRIPTIO
The LTC®1385 is an ultra-low power, 2-driver/2-receiver
EIA / TIA-562 transceiver which operates from a single
3.3V supply. The charge pump requires only four spacesaving 0.1µF capacitors.
Operates from a Single 3.3V Supply
Low Supply Current: ICC = 200µA
ICC = 35µA in Driver Disable Mode
ICC = 0.2µA in Shutdown Mode
ESD Protection Over ±10kV
Uses Small Capacitors: 0.1µF
Operates to 120kBaud
Output Overvoltage Does Not Force Current
Back into Supplies
EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
Pin Compatible with LT1180A
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, ICC is
only 200µA in the unloaded condition. In the Driver Disable
mode, the charge pump is turned off, the driver outputs
are forced into three-state, both receivers are kept active,
and ICC drops to 35µA. In the Shutdown mode, everything
is turned off and ICC drops to 0.2µA.
The LTC1385 is fully compliant with all data rate and
overvoltage EIA / TIA-562 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
2-Drivers/2-Receivers with Shutdown
and Driver Disable
0.1µF
LTC1385
4
LOGIC INPUT
6 VCC
15
VCC
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
0.1µF
300k
12
8
13
14
5k
10
5k
ON/OFF
562 OUTPUT
300k
11
18
9
562 OUTPUT
562 INPUT
562 INPUT
16
500
1.0
0.1µF
400
0.8
QUIESCENT
CURRENT
300
0.6
0.4
200
100
SHUTDOWN
CURRENT
0
–20
0
20
40
TEMPERATURE (°C)
60
0.2
0
80
TEST CONDITION: VCC = 3.3V
1
DRIVER DISABLE
1.2
SHUTDOWN CURRENT (µA)
7
5
0.1µF
3
600
VCC = 3.3V
QUIESCENT CURRENT (µA)
17
2
Quiescent and Shutdown Supply Current
vs Temperature
LTC1385 • TA02
LTC1385 • TA01
sn1385 1385fas
1
LTC1385
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AXI U
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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
LTC1385C ............................................. 0°C to 70°C
LTC1385I ........................................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
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U
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
DRIVER
DISABLE
C1 +
1
20 ON/OFF
2
19 VCC
V+
3
18 GND
–
4
17 TR1 OUT
C2 +
5
16 RX1 IN
C2 –
6
15 RX1 OUT
C1
V–
7
14 TR1 IN
TR2 OUT
8
13 TR2 IN
RX2 IN
9
ORDER PART
NUMBER
LTC1385CG
LTC1385IG
12 RX2 OUT
NC 10
ORDER PART
NUMBER
TOP VIEW
DRIVER
DISABLE 1
C1+ 2
18 ON/OFF
17 VCC
V+ 3
C1– 4
15 TR1 OUT
C2+ 5
14 RX1 IN
C2– 6
13 RX1 OUT
V– 7
12 TR1 IN
TR2 OUT 8
11 TR2 IN
RX2 IN 9
11 NC
N PACKAGE
18-LEAD PDIP
G PACKAGE
20-LEAD SSOP
TJMAX = 125°C, θJA = 135°C/W
LTC1385CN
LTC1385CSW
LTC1385IN
LTC1385ISW
16 GND
10 RX2 OUT
SW PACKAGE
18-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 85°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, VON/OFF = VCC, Driver Disable = VCC, unless noted.
PARAMETER
CONDITIONS
Any Driver
Output Voltage Swing
3k to GND
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
MIN
TYP
4.5
– 4.5
1.4
1.4
Positive
Negative
●
●
3.7
– 3.7
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
VIN = VCC
VIN = 0V
VOUT = 0V
Shutdown or Driver Disable or VCC = 0V (Note 3,4),
VOUT = ±20V
●
●
2.0
●
●
●
– 20
±10
±10
MAX
0.8
5
– 40
±500
UNITS
V
V
V
V
µA
µA
mA
µA
sn1385 1385fas
2
LTC1385
DC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, VON/OFF = VCC, Driver Disable = VCC, unless noted.
PARAMETER
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
Power Supply
VCC Supply Current
Supply Leakage Current (VCC)
CONDITIONS
Input Low Threshold
Input High Threshold
– 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 = 0V
Shutdown (Note 4), 0V ≤ VOUT ≤ VCC
MIN
TYP
●
●
0.8
●
0.1
3
1.3
1.7
0.4
5
0.2
3.2
– 20
7
1
●
●
3.0
–5
2
●
IOUT = 0mA
IOUT = 5mA
IOUT = 0mA
IOUT = – 5mA
Shutdown or Driver Disable to Turn-On
No Load (Note 2), 0°C to 70°C
No Load (Note 2), – 40°C to 85°C
Shutdown (Note 4)
Driver Disable (Note 3)
Digital Input Threshold Low
Digital Input Threshold High
MAX
UNITS
V
V
V
kΩ
V
V
mA
mA
µA
2.4
1.0
7
0.4
10
5.7
5.5
– 5.3
– 5.0
0.2
●
●
●
●
●
●
2.0
0.2
3.5
0.2
35
1.4
1.4
V
V
V
V
ms
0.5
1.0
10
50
0.8
mA
mA
µA
µA
V
V
AC CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range.
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
PARAMETER
Slew Rate
Driver Propagation Delay
(TTL to EIA / TIA-562)
Receiver Propagation Delay
(EIA / TIA-562 to TTL)
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)
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.
MIN
3
●
●
●
●
TYP
8
5
2
2
0.3
0.2
MAX
30
3.5
3.5
0.8
0.8
UNITS
V/µs
V/µs
µs
µs
µs
µs
Note 3: Measurements made in the Driver Disable mode are performed
with VDRIVER DISABLE = GND and VON/OFF = VCC.
Note 4: Measurements made in the Shutdown mode are performed with
VON/OFF = 0V.
sn1385 1385fas
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LTC1385
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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
1.0
70
10
5
0
0
10
40
30
50
20
TEMPERATURE (˚C)
LTC1385 • TPC01
60
70
0
Driver Leakage in Shutdown
vs Temperature
4.0
40
16
LEAKAGE CURRENT (µA)
2.5
1 DRIVER LOADED
RL = 3k
2.0
1.5
1.0
35
30
25
15
10
5
0
0
10
20
30
50
40
TEMPERATURE (°C)
60
VOUT = –20V
20
0.5
0
SHORT-CIRCUIT CURRENT (mA)
18
3.0
VOUT = 20V
10
30
20
40
50
TEMPERATURE (°C)
35
30
60
ISC+
6
4
0
70
10
30
50
40
20
TEMPERATURE (°C)
60
70
LTC1385 • TPC06
Receiver Output Waveform
RECEIVER
OUTPUT
CL = 51pF
DRIVER
OUTPUT
RL = 3k
ISC–
20
8
2
DRIVER
OUTPUT
RL = 3k
CL = 1000pF
40
ISC–
10
Driver Output Waveforms
45
25
14
12
LTC1385 • TPC05
LTC1385 • TPC04
Receiver Short-Circuit Current
vs Temperature
140
0
0
70
120
Driver Short-Circuit Current
vs Temperature
45
2 DRIVERS LOADED
RL = 3k
80 100
60
DATA RATE (kBAUD)
40
LTC1385 • TPC03
4.5
3.5
20
LTC1385 • TPC02
VCC Supply Current
vs Temperature
SUPPLY CURRENT (mA)
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
SHORT-CIRCUIT CURRENT (mA)
Supply Current vs Data Rate
20
2.2
INPUT
15
INPUT
ISC+
10
LTC1385 • TPC08
LTC1385 • TPC09
5
0
0
10
30
50
40
20
TEMPERATURE (°C)
60
70
LTC1385 • TPC06
sn1385 1385fas
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LTC1385
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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.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode independent
of the Driver Disable pin. The supply current drops to
0.2µA and all driver and receiver outputs are forced into
three-state.
DRIVER DISABLE: TTL/CMOS Compatible Input Pin. With
the ON/OFF pin held high, a logic low forces the part into
the Driver Disable mode with the charge pump turned off
and the driver outputs forced into three-state. Both receivers remain active and the supply current drops to 35µA. A
logic high forces the part into the Normal mode.
V +: Positive Supply Output (EIA/TIA-562 Drivers).
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 share a common capacitor. For a large number
of devices, increasing the size of the shared common
storage capacitors is recommended to reduce ripple.
V –: Negative Supply Output (EIA/TIA-562 Drivers).
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 2Ω.
TR IN: EIA/TIA-562 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. To minimize power consumption, the
internal driver pull-up resistors are disconnected from VCC
in the Shutdown mode.
TR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the Shutdown or Driver Disable 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 the
Shutdown mode.
U
W
W
SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
VCC
1.4V
1.4V
0V
V+
DRIVER
OUTPUT
0V
0V
t LHD
V
–
t HLD
VCC
1.7V
RX
INPUT
RX
OUTPUT
1.3V
0V
2.4V
0.8V
t LHR
t HLR
1385 F01
Figure 1. Driver Propagation Delay Timing
VCC
0V
1385 F02
Figure 2. Receiver Propagation Delay Timing
sn1385 1385fas
5
LTC1385
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
INPUT
RX
OUTPUT
DRIVER
OUTPUT
RX INPUT
DRIVER
51pF
RX
51pF
3k
1385 F04
1385 F03
ESD Test Circuit
17
2
0.1µF
LTC1385
4
LOGIC INPUT
6 VCC
LOGIC OUTPUT
LOGIC OUTPUT
0.1µF
300k
15
12
S
VCC
LOGIC INPUT
11
13
0.1µF
562 OUTPUT
300k
8
S
14
S
5k
10
S
5k
ON/OFF
VCC
7
5
0.1µF
3
18
9
562 OUTPUT
562 INPUT
RS562
LINE PINS
PROTECTED
TO ±10kV
562 INPUT
16
1
DRIVER DISABLE
1385 F05
sn1385 1385fas
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LTC1385
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PACKAGE DESCRIPTIO
G Package
20-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
6.90 – 7.50*
(.272 – .295 )
20 19 18 17 16 15 14 13 12 11
1.25 ±0.12
7.8 – 8.2
5.3 – 5.7
7.40 – 8.20
(.291 – .323)
0.42 ±0.03
0.65 BSC
RECOMMENDED SOLDER PAD LAYOUT
1 2 3 4 5 6 7 8 9 10
5.00 – 5.60**
(.197 – .221)
2.0
(.079)
0° – 8°
0.65
(.0256)
BSC
0.55 – 0.95
(.022 – .037)
0.09 – 0.25
(.0035 – .010)
0.05
(.002)
0.22 – 0.38
(.009 – .015)
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
MILLIMETERS
2. DIMENSIONS ARE IN
(INCHES)
G20 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
N Package
18-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.900*
(22.860)
MAX
18
17
16
15
14
13
12
11
10
1
2
3
4
5
6
7
8
9
.255 ± .015*
(6.477 ± 0.381)
.130 ± .005
(3.302 ± 0.127)
.300 – .325
(7.620 – 8.255)
.008 – .015
(0.203 – 0.381)
(
+.035
.325 –.015
8.255
+0.889
–0.381
)
.045 – .065
(1.143 – 1.651)
.020
(0.508)
MIN
.065
(1.651)
TYP
.120
(3.048)
MIN
.005
(0.127)
MIN
.100
(2.54)
BSC
.018 ± .003
(0.457 ± 0.076)
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
N18 1002
sn1385 1385fas
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
LTC1385
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PACKAGE DESCRIPTIO
SW Package
18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
TYP
.447 – .463
(11.354 – 11.760)
NOTE 4
N
18
17
16
15
14
13
12
11
10
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
.291 – .299
(7.391 – 7.595)
NOTE 4
.010 – .029 × 45°
(0.254 – 0.737)
.009 – .013
(0.229 – 0.330)
NOTE:
1. DIMENSIONS IN
2
1
3
4
5
6
7
8
.093 – .104
(2.362 – 2.642)
9
.037 – .045
(0.940 – 1.143)
0° – 8° TYP
NOTE 3
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.004 – .012
(0.102 – 0.305)
.014 – .019
(0.356 – 0.482)
TYP
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)
S18 (WIDE) 0502
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
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5V, 2 Driver, 2 Receiver RS232 Transceivers
±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
200µA Supply Current, 0.2µA in Shutdown
LTC1383
5V, 2 Driver, 2 Receiver RS232 Transceiver
200µA Supply Current, Narrow 16-Pin SO
LTC1384
5V, 2 Driver, 2 Receiver RS232 Transceiver
200µA Supply Current, 2 Receivers Active in Shutdown
LTC1386
3.3V, 2 Driver, 2 Receiver RS562 Transceiver
200µA Supply Current, Narrow 16-Pin SO
sn1385 1385fas
8
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 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 1994
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