Fiche technique pour LTC1385 de Analog Devices Inc.

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1
LTC1385
sn1385 1385fas
3.3V Low Power
EIA/TIA-562 Transceiver
■
Operates from a Single 3.3V Supply
■
Low Supply Current: I
CC
= 200µA
■
I
CC
= 35µA in Driver Disable Mode
■
I
CC
= 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 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 space-
saving 0.1µF capacitors.
The transceiver operates in one of three modes: Normal,
Driver Disable or Shutdown. In the Normal mode, I
CC
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 I
CC
drops to 35µA. In the Shutdown mode, everything
is turned off and I
CC
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.
■
Notebook Computers
■
Palmtop Computers
Quiescent and Shutdown Supply Current
vs Temperature
2-Drivers/2-Receivers with Shutdown
and Driver Disable
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
600
500
400
300
200
100
020 40 60
LTC1385 • TA02
800
1.2
1.0
0.8
0.6
0.4
0.2
0
SHUTDOWN CURRENT (µA)
QUIESCENT
CURRENT
SHUTDOWN
CURRENT
TEST CONDITION: V
CC
= 3.3V
–20
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1385 • TA01
0.1µF
0.1µF
0.1µF0.1µF
LTC1385
DRIVER DISABLE
2
4
5
6
12
11
13
10
18
14
9
16
1
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
ON/OFF
17
3
7
15 562 OUTPUT
VCC = 3.3V
562 OUTPUT
562 INPUT
562 INPUT
5k
5k
300k
V
CC
300k
V
CC
8
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2
LTC1385
sn1385 1385fas
Supply Voltage (V
CC
) ................................................ 5V
Input Voltage
Driver ....................................... –0.3V to V
CC
+ 0.3V
Receiver ............................................... – 25V to 25V
Digital Input............................... –0.3V to V
CC
+ 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... –0.3V to V
CC
+ 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
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing 3k to GND Positive ● 3.7 4.5 V
Negative ●–3.7 – 4.5 V
Logic Input Voltage Level Input Low Level (V
OUT
= High) ●1.4 0.8 V
Input High Level (V
OUT
= Low) ●2.0 1.4 V
Logic Input Current V
IN
= V
CC
● 5 µA
V
IN
= 0V ●–20 –40 µA
Output Short-Circuit Current V
OUT
= 0V ±10 mA
Output Leakage Current Shutdown or Driver Disable or V
CC
= 0V (Note 3,4), ●±10 ±500 µA
V
OUT
= ±20V
ABSOLUTE AXI U RATI GS
WWWU
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.
LTC1385CG
LTC1385IG
ORDER PART
NUMBER ORDER PART
NUMBER
LTC1385CN
LTC1385CSW
LTC1385IN
LTC1385ISW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
T
JMAX
= 125°C, θ
JA
= 135°C/W
1
2
3
4
5
6
7
8
9
10
TOP VIEW
G PACKAGE
20-LEAD SSOP
20
19
18
17
16
15
14
13
12
11
C1
+
V
+
C1
–
C2
+
C2
–
V
–
TR2 OUT
RX2 IN
NC
ON/OFF
VCC
GND
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
NC
DRIVER
DISABLE
T
JMAX
= 125°C, θ
JA
= 85°C/W
1
2
3
4
5
6
7
8
9
TOP VIEW
SW PACKAGE
18-LEAD PLASTIC SO
18
17
16
15
14
13
12
11
10
C1
+
V
+
C1–
C2
+
C2–
V–
TR2 OUT
RX2 IN
ON/OFF
V
CC
GND
TR1 OUT
RX1 IN
RX1 OUT
TR1 IN
TR2 IN
RX2 OUT
N PACKAGE
18-LEAD PDIP
DRIVER
DISABLE
PACKAGE/ORDER I FOR ATIO
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LTC1385
sn1385 1385fas
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Receiver
Input Voltage Thresholds Input Low Threshold ●0.8 1.3 V
Input High Threshold ●1.7 2.4 V
Hysteresis ●0.1 0.4 1.0 V
Input Resistance –10V ≤ V
IN
≤ 10V 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= – 1.6mA (V
CC
= 3.3V) ●0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 3.3V) ●3.0 3.2 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–5 –20 mA
Sourcing Current, V
OUT
= 0V 2 7 mA
Output Leakage Current Shutdown (Note 4), 0V ≤ V
OUT
≤ V
CC
●110 µA
Power Supply Generator
V
+
Output Voltage I
OUT
= 0mA 5.7 V
I
OUT
= 5mA 5.5 V
V
–
Output Voltage I
OUT
= 0mA –5.3 V
I
OUT
= –5mA –5.0 V
Supply Rise Time Shutdown or Driver Disable to Turn-On 0.2 ms
Power Supply
V
CC
Supply Current No Load (Note 2), 0°C to 70°C●0.2 0.5 mA
No Load (Note 2), – 40°C to 85°C●3.5 1.0 mA
Supply Leakage Current (V
CC
) Shutdown (Note 4) ●0.2 10 µA
Driver Disable (Note 3) ●35 50 µA
Digital Input Threshold Low ●1.4 0.8 V
Digital Input Threshold High ●2.0 1.4 V
DC ELECTRICAL CHARACTERISTICS
AC CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Slew Rate R
L
= 3k, C
L
= 51pF 8 30 V/µs
R
L
= 3k, C
L
= 1000pF 3 5 V/µs
Driver Propagation Delay t
HLD
(Figure 1) ●2 3.5 µs
(TTL to EIA/TIA-562) t
LHD
(Figure 1) ●2 3.5 µs
Receiver Propagation Delay t
HLR
(Figure 2) ●0.3 0.8 µs
(EIA/TIA-562 to TTL) t
LHR
(Figure 2) ●0.2 0.8 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: Measurements made in the Driver Disable mode are performed
with V
DRIVER DISABLE
= GND and V
ON/OFF
= V
CC
.
Note 4: Measurements made in the Shutdown mode are performed with
V
ON/OFF
= 0V.
The ● denotes specifications which apply over the full operating temperature range.
VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
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.
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LTC1385
sn1385 1385fas
DATA RATE (kBAUD)
0
SUPPLY CURRENT (mA)
60
LTC1385 • TPC03
10
5
20 40 80
0
20
15
100 120 140
V
CC
= 3.3V
R
L
= 3k
C
L
= 2500pF
ALL DRIVERS ACTIVE
Supply Current vs Data Rate
TEMPERATURE (°C)
0
0
SUPPLY CURRENT (mA)
0.5
1.5
2.0
2.5
40
4.5
LTC1385 • TPC04
1.0
20
10 50 60
30 70
3.0
3.5
4.0
2 DRIVERS LOADED
R
L
= 3k
1 DRIVER LOADED
R
L
= 3k
VCC Supply Current
vs Temperature
TEMPERATURE (°C)
0
–5
DRIVER OUTPUT VOLTAGE (V)
–4
–2
–1
0
5
2
20 40 50
LTC1385 • TPC01
–3
3
4
1
10 30 60 70
OUTPUT HIGH
V
CC
= 3.3V
OUTPUT LOW
V
CC
= 3.3V
ALL DRIVERS WITH LOAD
R
L
= 3k
Driver Output Voltage
vs Temperature
TEMPERATURE (˚C)
0
THRESHOLD VOLTAGE (V)
1.8
2.0
2.2
30
V
TH+
V
TH–
50
LTC1385 • TPC02
1.6
1.4
10 20 40 60 70
1.2
1.0
Receiver Input Thresholds
vs Temperature
Driver Leakage in Shutdown
vs Temperature
TEMPERATURE (°C)
0
LEAKAGE CURRENT (µA)
60
45
40
35
30
25
20
15
10
5
0
LTC1385 • TPC05
20 7010 30 40 50
V
OUT
= –20V
V
OUT
= 20V
Driver Short-Circuit Current
vs Temperature
TEMPERATURE (°C)
0
0
SHORT-CIRCUIT CURRENT (mA)
2
6
8
10
20
18
LTC1385 • TPC06
4
10 30
I
SC–
I
SC+
40 60
50 70
12
14
16
Receiver Short-Circuit Current
vs Temperature
TEMPERATURE (°C)
0
0
SHORT-CIRCUIT CURRENT (mA)
5
15
20
25
20
45
LTC1385 • TPC06
10
10 30
I
SC–
40 60
50 70
30
35
40
I
SC+
Driver Output Waveforms Receiver Output Waveform
DRIVER
OUTPUT
R
L
= 3k
C
L
= 1000pF
INPUT
DRIVER
OUTPUT
R
L
= 3k
LTC1385 • TPC08 LTC1385 • TPC09
RECEIVER
OUTPUT
C
L
= 51pF
INPUT
TYPICAL PERFOR A CE CHARACTERISTICS
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LTC1385
sn1385 1385fas
V
CC
: 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 receiv-
ers 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
+
≅ 2V
CC
– 1V. This pin requires an external capacitor
C = 0.1µF for charge storage. The capacitor may be tied
to ground or V
CC
. 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 V
CC
are
included on chip. To minimize power consumption, the
internal driver pull-up resistors are disconnected from V
CC
in the Shutdown mode.
TR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the Shut-
down or Driver Disable mode or V
CC
= 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 Lev-
els. Outputs are in a high impedance state when in the
Shutdown mode.
1.4V
0V
V
CC
0V
V
+
V
–
0V
DRIVER
INPUT
DRIVER
OUTPUT
1.4V
t
HLD
t
LHD
1385 F01
Figure 1. Driver Propagation Delay Timing
0.8V
V
CC
0V
2.4V
RX
INPUT
RX
OUTPUT
1.3V
t
HLR
1.7V
t
LHR
1385 F02
V
CC
0V
Figure 2. Receiver Propagation Delay Timing
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LTC1385
sn1385 1385fas
Driver Timing Test Load Receiver Timing Test Load
DRIVER
DRIVER
INPUT
3k
51pF
DRIVER
OUTPUT
1385 F03
RX INPUT
51pF
RX
OUTPUT
1385 F04
RX
ESD Test Circuit
TEST CIRCUITS
1385 F05
0.1µF
0.1µF
0.1µF0.1µF
LTC1385
DRIVER DISABLE
2
4
5
6
12
11
13
10
18
14
9
16
1
LOGIC INPUT
LOGIC INPUT
LOGIC OUTPUT
LOGIC OUTPUT
ON/OFF
17
3
7
15 562 OUTPUT
RS562
LINE PINS
PROTECTED
TO ±10kV
VCC
562 OUTPUT
562 INPUT
562 INPUT
5k
S
S
S
5k
S
300k
V
CC
300k
V
CC
8
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LTC1385
sn1385 1385fas
N18 1002
.020
(0.508)
MIN
.120
(3.048)
MIN
.130 ± .005
(3.302 ± 0.127)
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.018 ± .003
(0.457 ± 0.076)
.005
(0.127)
MIN
.255 ± .015*
(6.477 ± 0.381)
.900*
(22.860)
MAX
18
123456789
1011
121314
16 1517
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
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)
.100
(2.54)
BSC
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 represen
ta-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
PACKAGE DESCRIPTIO
N Package
18-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
G Package
20-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
G20 SSOP 0802
0.09 – 0.25
(.0035 – .010)
0° – 8°
0.55 – 0.95
(.022 – .037)
5.00 – 5.60**
(.197 – .221)
7.40 – 8.20
(.291 – .323)
12345678910
6.90 – 7.50*
(.272 – .295 )
1718 14 13 12 1115161920
2.0
(.079)
0.05
(.002)
0.65
(.0256)
BSC 0.22 – 0.38
(.009 – .015)
MILLIMETERS
(INCHES)
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
*
**
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
0.42 ±0.03 0.65 BSC
5.3 – 5.7
7.8 – 8.2
RECOMMENDED SOLDER PAD LAYOUT
1.25 ±0.12
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8
LTC1385
sn1385 1385fas
LINEAR TECHNOLOGY CORPORATION 1994
LW/TP 1002 1K REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
●
FAX
: (408) 434-0507
●
www.linear.com
S18 (WIDE) 0502
NOTE 3
.447 – .463
(11.354 – 11.760)
NOTE 4
15 14 13 12 11 10
16
9
N/2
12345678
.394 – .419
(10.007 – 10.643)
1718
N
.037 – .045
(0.940 – 1.143)
.004 – .012
(0.102 – 0.305)
.093 – .104
(2.362 – 2.642)
.050
(1.270)
BSC .014 – .019
(0.356 – 0.482)
TYP
0° – 8° TYP
NOTE 3
.009 – .013
(0.229 – 0.330) .016 – .050
(0.406 – 1.270)
.291 – .299
(7.391 – 7.595)
NOTE 4
× 45°
.010 – .029
(0.254 – 0.737)
.420
MIN
.325 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
N
1 2 3 N/2
.050 BSC
.030 ±.005
TYP
.005
(0.127)
RAD MIN
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
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)
U
PACKAGE DESCRIPTIO
SW Package
18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
PART NUMBER DESCRIPTION COMMENTS
LT1780/LT1781 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
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