LTC1348CG#TRPBF [Linear]
LTC1348 - 3.3V/5V Low Power RS232 3-Driver/5-Receiver Transceiver; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C;型号: | LTC1348CG#TRPBF |
厂家: | Linear |
描述: | LTC1348 - 3.3V/5V Low Power RS232 3-Driver/5-Receiver Transceiver; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C 驱动器 |
文件: | 总8页 (文件大小:247K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC1348
3.3V/5V Low Power RS232
3-Driver/5-Receiver Transceiver
U
DESCRIPTIO
EATURE
S
F
The LTC®1348 is a 3-driver/5-receiver RS232 transceiver
with very low supply current. The charge pump only
requires five 0.1µF capacitors. The LTC1348 provides full
RS232 output levels when operated over a wide supply
range of 3V to 5.5V
■
■
■
■
■
■
■
■
Low Supply Current: 600µA at 3.3V
Supply Current in Shutdown: 0.2µA
Supply Current in Receiver Alive Mode: 15µA
ESD Protection over ±10kV
Operates from a Single 3V to 5.5V Supply
Operates to 120kBaud with 0.1µF Flying Capacitors
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current
Back into Supplies
The transceiver operates in one of four modes: Normal,
ReceiverDisable,ReceiverAliveandShutdown.InNormal
or Receiver Disable mode, ICC is only 600µA at 3.3V and
800µA at 5V in the no load condition. In Shutdown mode,
the supply current is further reduced to 0.2µA. In Receiver
Alive mode, all five receivers are kept alive and the supply
current is 15µA. All RS232 outputs assume a high imped-
ance state in Shutdown or Receiver Alive mode or with the
power off. The receiver outputs assume a high impedance
state in Receiver Disable or with the power off.
■
■
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
Flowthrough Architecture
O U
PPLICATI
S
A
■
■
■
■
Notebook Computers
Palmtop Computers
Printers
The LTC1348 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver oper-
ates up to 120kbaud with all drivers loaded with 1000pF,
3kΩ.Bothdriveroutputsandreceiverinputscanbeforced
to ±25V without damage and can survive multiple ±10kV
ESD strikes.
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
O
TYPICAL APPLICATI
Supply Current
3-Drivers/5-Receivers with Shutdown
1.6
1.6
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
LTC1348
C4
0.1µF
C5
0.1µF
1.4
1.2
1.4
1.2
C2
C3
0.1µF
3
0.1µF
QUIESCENT
CURRENT
4
DR 1 IN
RX1 OUT
DR 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR 3 IN
RX5 OUT
DREN
V
CC
1.0
0.8
0.6
0.4
0.2
1.0
0.8
0.6
0.4
0.2
5
V
= 5V
CC
C1
0.1µF
6
V
CC
= 3.3V
7
DR 1 OUT
RX1 IN
8
SHUTDOWN
CURRENT
V
CC
OR 5V
= 3.3V
9
DR 2 OUT
RX2 IN
10
11
12
13
14
RX3 IN
0
0
–20
0
40
60
80
–40
20
RX4 IN
TEMPERATURE (˚C)
DR 3 OUT
RX5 IN
RXEN
LT1348 •TA02
GND
LT1348 • TA01
1
LTC1348
W W W
U
/O
ABSOLUTE AXI U RATI GS
(Note 1)
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Driver ....................................... –0.3V to VCC + 0.3V
Receiver ............................................... – 25V to 25V
Driver/Receiver Enable Pin ........ –0.3V to VCC + 0.3V
Output Voltage
+
+
–
–
NUMBER
V
C2
C2
1
2
3
4
5
6
7
8
9
28
V
+
27 C3
26 C3
–
LTC1348CG
LTC1348CSW
LTC1348IG
V
25 DR1 IN
24 RX1 OUT
23 DR2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19 DR3 IN
18
CC
+
C1
C1
–
LTC1348ISW
DR1 OUT
RX1 IN
Driver ................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short-Circuit Duration
DR2 OUT
RX2 IN 10
RX3 IN 11
RX4 IN 12
DR3 OUT 13
RX5 IN 14
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range
RX5 OUT
17 DREN
16 RXEN
15 GND
G PACKAGE
SW PACKAGE
28-LEAD PLASTIC SSOP
28-LEAD PLASTIC SO
LTC1348C................................................ 0°C to 70°C
LTC1348I............................................ –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TJMAX = 125°C, θJA = 96°C/W (G)
JMAX = 125°C, θJA = 85°C/W (SW)
T
Consult factory for Military grade parts.
DC ELECTRICAL CHARACTERISTICS
VCC = 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
V
CC
= 3.3V, 3k to GND
Positive
Negative
●
●
5.0
–5.0
6.2
– 6.0
V
V
Logic Input Voltage Level
Logic Input Current
Input Low Level (V
Input High Level (V
Input High Level (V
= High)
= Low), V = 3.3V
= Low), V = 5V
●
●
●
0.8
V
V
V
µA
µA
mA
µA
OUT
2.0
2.4
OUT
OUT
CC
CC
V
IN
V
IN
= V
= 0V
●
●
5
–35
CC
–5
±12
±10
Output Short-Circuit Current
Output Leakage Current
V
OUT
= 0V
Shutdown (Note 3) or Receiver Alive Mode (Note 4),
= ±20V
●
±500
V
OUT
Any Receiver
Input Voltage Thresholds
Input Threshold (Receiver Alive Mode)
Input Low Threshold (Normal Mode)
Input High Threshold (Normal Mode)
0.8
0.8
1.5
1.3
1.7
2.4
2.4
V
V
V
Hysteresis
Input Resistance
Output Voltage
Normal Mode
0.3
5
0.2
V
kΩ
V
V
V
IN
= ±10V
3
7
0.4
Output Low, I
Output High, I
= – 1.6mA
= 160µA
●
●
OUT
V
– 0.6V
CC
OUT
Output Short-Circuit Current
Output Leakage Current
Sinking Current, V
Shutdown (Note 3), 0V ≤ V
= V
–3
–20
1
mA
µA
OUT
CC
≤ V
●
10
OUT
CC
2
LTC1348
DC ELECTRICAL CHARACTERISTICS
VCC = 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
+
V Output Voltage
I
I
I
I
= 0mA
= 8mA
= 0mA
8.0
7.5
–8.0
–7.0
V
V
V
V
OUT
OUT
–
V Output Voltage
OUT
OUT
= –8mA
Supply Rise Time
Shutdown to Turn-On
0.2
ms
Power Supply
V
CC
Supply Current
No Load (Note 2) V = 3.3V
●
●
●
0.6
0.8
15
2.0
2.5
30
mA
mA
µA
CC
No Load (Note 2) V = 5V
CC
Receiver Alive Mode (Note 4) V = 3.3V or 5V
CC
Supply Leakage Current (V
)
Shutdown (Note 3)
●
●
●
●
0.2
10
0.8
µA
V
V
CC
Driver/Receiver Enable Threshold Low
Driver/Receiver Enable Threshold High
Driver/Receiver Enable Threshold High
V
V
= 3.3V
= 5V
2.0
2.4
CC
V
CC
AC ELECTRICAL CHARACTERISTICS
VCC = 3V to 5.5V, C1 to C4 = 0.1µF, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
250
8
MAX
UNITS
Maximum Data Rate
Slew Rate
R = 3k, C = 1000pF, One Driver Switching
120
kbps
V/µs
V/µs
µs
µs
L
L
V
V
= 5V, R = 3k, C = 51pF
30
CC
CC
L
L
= 3.3V, R = 3k, C = 2500pF
3
L
(Figure 1)
(Figure 1)
L
Driver Propagation Delay
(TTL to RS232)
t
t
●
●
2.5
2.5
4
4
HLD
LHD
Receiver Propagation Delay
(RS232 to TTL)
t
t
t
t
(Figure 2) (Normal Mode)
(Figure 2) (Normal Mode)
(Figure 2) (Receiver Alive Mode)
(Figure 2) (Receiver Alive Mode)
●
●
●
●
0.3
0.2
1.0
0.2
1
1
4
4
µs
µs
µs
µs
HLR
LHR
HLR
LHR
The
●
denotes specifications which apply over the full operating
Note 3: Supply current measurement in Shutdown is performed with
and V = 0V.
temperature range (0°C ≤ T ≤ 70°C for Commercial grade and
V
DREN
A
RXEN
–40°C ≤ T ≤ 85°C for Industrial grade).
Note 1: Absolute Maximum Ratings are those values beyond which the life
A
Note 4: Supply current measurement in Receiver Alive mode is performed
with V = 0V and V = V
.
CC
DREN
RXEN
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded. The V
and V
= V .
RXEN CC
DREN
3
LTC1348
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Supply Current
Driver Output Voltage High/Low
vs Load Capacitance (CL)
Driver Output Voltage High/Low
vs Load Capacitance (CL)
vs Driver Data Rate
50
40
30
20
10
0
7
6
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
–7
7
6
5
4
3
2
1
0
3 OUTPUT LOADED
120kbps
64kbps
OUTPUT HIGH
250kbps
64kbps
120kbps
3kΩ // 2500pF
20kbps
OUTPUT HIGH
20kbps
V
CC
= 3.3V
V
= 3.3V
CC
0.1µF FLYING CAPACITORS
ALL DRIVERS LOADED 3kΩ + C
1 DRIVER DRIVEN
0.1µF FLYING CAPACITORS
L
ALL DRIVERS DRIVEN AND
1 OUTPUT LOADED
3kΩ // 2500pF
–1
–2
–3
–4
–5
–6
–7
LOADED 3kΩ + C
L
OUTPUT LOW
OUTPUT LOW
64kbps
20kbps
64kbps
120kbps
1000
120kbps
250kbps
1000
V
= 3.3V
50
CC
20kbps
4000
0
100
150
200
250
3000
4000
5000
0
2000
3000
5000
0
2000
DRIVER DATA RATE
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
LTC1348 G02
LTC1348 G01
LTC1348 G03
Driver Leakage in SHUTDOWN
Driver Output Voltage High/Low
Driver Short-Circuit Current
vs Temperature (°C)
vs Temperature (°C)
vs Temperature (°C)
7
6
5
4
3
2
1
0
45
20
18
16
14
12
10
8
V
= 3.3V
CC
V
CC
= 3.3V
40
35
30
25
20
15
10
5
V
CC
= 3V
V
CC
= 3.3V
OUTPUT HIGH
–
I
SC
+
I
SC
ALL DRIVERS
LOADED WITH 3kΩ
V
= –20V
= 20V
–1
–2
–3
–4
–5
–6
–7
OUT
OUTPUT LOW
6
V = 3V
CC
V
= 3.3V
V
OUT
CC
4
0
0
0
10
20
30
40
50
60
70
0
10
20
30
40
60
70
50
–40 –20
0
20
40
80 100
60
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1348 G04
LTC1348 G06
LTC1348 G05
With VCC = 3.3V
All Driver Outputs Loaded with
3kΩ, 1000pF. 1 Driven at 250kbps
DRIVEN DRIVER
OUTPUT
DRIVER
INPUT
LTC1348 G07
4
LTC1348
U
U
U
PI FU CTIO S
VCC: 3V to 5.5V Input Supply Pin. This pin should be
decoupled with a 0.1µF ceramic capacitor.
efficiency,thecapacitor’seffectiveseriesresistanceshould
be less than 1Ω. Ceramic capacitors are recommended.
GND: Ground Pin.
DR IN: RS232 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
internaldriverpull-upresistorsaredisconnectedfromVCC
in the Shutdown or Receiver Alive mode.
RXEN: TTL/CMOS Compatible Enable Pin. Refer to Table
1 for its functional description.
DREN: TTL/CMOS Compatible Enable Pin. Refer to Table
1 for its functional description.
V+: Positive Supply Output (RS232 Drivers). This pin
requires an external capacitor C = 0.1µF for charge stor-
age. The capacitor may be tied to ground or VCC. With
multipledevices, the V+ andV– pinsmaybeparalleledinto
common capacitors. For large numbers of devices, in-
creasing the size of the shared common storage capaci-
tors is recommended to reduce ripple.
V–: Negative Supply Output (RS232 Drivers). This pin
requires an external capacitor C = 0.1µF for charge
storage.
DR OUT: DriverOutputsatRS232Voltage Levels. Outputs
are in a high impedance state when in the Shutdown,
Receiver Alive 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
withoutdamage. Thereceiverinputsareprotectedagainst
ESD to ±10kV for human body model discharges. Each
receiverprovides0.4Vofhysteresisfornoiseimmunity.In
Receiver Alive mode all receivers have no hysteresis.
C1+, C1–, C2+, C2–, C3+, C3–: Commutating Capacitor
Inputs. These pins require three external capacitors C =
0.1µF: one from C1+ to C1–, another from C2+ to C2– and
another from C3+ to C3–. To maintain charge pump
RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev-
els. Outputs are in a high impedance state when in the
Shutdown or Receiver Disable mode to allow data line
sharing.
Table 1. Functional Description
MODE
RX ENABLE
DR ENABLE
DRIVERS
RECEIVERS
I
CC
TYP
Shutdown
0
0
All Drivers Shutdown.
All Driver Outputs Assume High Impedance.
All Driver Pull-Up Resistors Disconnect
All Receivers Shutdown.
All Receiver Outputs Assume High Impedance.
0.2µA
From V
.
CC
Receiver
Disable
0
1
1
1
0
1
All Drivers Alive.
All Receiver Outputs in Three-State.
All Receivers Alive.
600µA at
3.3V,
800µA at
5V
Receiver
Alive
All Drivers Shutdown.
All Driver Outputs in Three-State.
All Driver Pull-Up Resistors Disconnect
15µA
From V
.
CC
Normal
All Drivers Alive.
All Receivers Alive.
600µA at
3.3V,
800µA at
5V
5
LTC1348
U
W
W
SWITCHI G TI E WAVEFOR S
V
V
CC
CC
1.7V
DRIVER
INPUT
RX
INPUT
1.3V
1.4V
1.4V
0V
0V
+
V
V
CC
DRIVER
OUTPUT
RX
OUTPUT
2.4V
0V
0V
–
0.8V
V
0V
t
t
t
LHD
t
LHR
HLD
HLR
LTC1348 • F01
LTC1348 • F02
Figure 1. Driver Propagation Delay Timing
Figure 2. Receiver Propagation Delay Timing
TEST CIRCUITS
ESD Test Circuit
DRIVER
OUTPUT
DRIVER
–
+
DRIVER
V
1
2
3
V
28
INPUT
LTC1348
+
+
–
51pF
3k
0.1µF
C2
27 C3
26
0.1µF
0.1µF
0.1µF
0.1µF
–
+
C3
25
C2
V
4
CC
LTC1348 • F03
DR1 IN
C1
5
6
24
23
RX1 OUT
DR2 IN
0.1µF
Figure 3. Driver Timing Test Load
–
C1
7
8
22
21
20
19
18
17
16
15
DR1 OUT
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
DREN
RX1 IN
9
DR2 OUT
RX2 IN
RX
OUTPUT
10
11
12
13
14
RS232 LINE PINS
PROTECTED TO ±10kV
RX INPUT
RX
RX3 IN
51pF
RX4 IN
DR3 OUT
RX5 IN
RXEN
GND
LTC1348 • F04
LT1348 • TC
Figure 4. Receiver Timing Test Load
U
W U U
APPLICATIONS INFORMATION
Power Supply
low as 2.2V. The charge pump requires three external
flying capacitors to operate; 0.1µF ceramic capacitors are
adequate for most applications. For applications requiring
extremely high data rates or abnormally heavy output
loads, 0.33µFflyingcapacitorsarerecommended. Bypass
and output capacitor values should match those of the
flying capacitors and all capacitors should be mounted as
close to the package as possible.
The LTC1348 includes an onboard voltage-tripling charge
pump capable of generating ±8V from a single 3.3V
supply. This allows the LTC1348 drivers to provide guar-
anteed ±5V RS232-compliant voltage levels with a 3.3V
supply. With all outputs loaded with 3kΩ, the LTC1348
can typically swing ±5V with voltages as low as 2.85V. It
will meet the ±3.7V EIA562 levels with supply voltages as
6
LTC1348
U
W U U
APPLICATIONS INFORMATION
High Data Rates
the same circuit with a single 1000pF/3kΩ loaded driver
driven at 250kbaud, and the other two drivers loaded but
not toggling. This closely approximates the actual behav-
iorofanRS232serialport,withonlyonedriver(TX)driven
at high speed and the other two drivers (RTS and DTR)
drivenatarelativelylowdatarateoratDC. Underthesame
conditions, the LTC1348 can go as fast as 350kbaud and
still meet EIA562 (±3.7V) minimum driver output levels.
The LTC1348 maintains true RS232 ±5V minimum driver
outputevenathighdatarates. Figure5showsatestcircuit
with 2m wires connecting the two test chips. Both chips
are run from 3.3V supplies. Figure 6 shows the typical line
waveforms with all three drivers, loaded with 1000pF and
3kΩ,togglingsimultaneouslyat120kbaud.Figure7shows
–
+
V
1
2
3
V
28
LTC1348
+
+
–
0.1µF
C2
27 C3
0.1µF
0.1µF
26
0.1µF
0.1µF
–
+
C3
C2
4
25
V
CC
DR1 IN
C1
5
6
24
23
RX1 OUT
DR2 IN
DRIVER OUTPUT
–
C1
7
8
9
DR1 OUT
22
21
20
19
18
17
16
15
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
DREN
RX1 IN
DR2 OUT
10
11
12
13
14
RECEIVER OUTPUT
DRIVER INPUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RXEN
RX5 IN
GND
1000pF
LTC1348 G06
–
+
1
V
V
28
27
26
Figure 6. Driver Test Result at 120kbps
LTC1348
+
+
C2
2
3
0.1µF
C3
0.1µF
0.1µF
0.1µF
–
–
–
C2
C3
25
4
5
6
V
CC
DRIVER 1 IN
+
C1
24
23
RX1 OUT
0.1µF
DRIVER 2 IN
C1
7
8
9
22
21
20
19
18
17
16
15
DR1 OUT
RX1 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
DREN
DR2 OUT
RX2 IN
10
11
12
13
14
DRIVER OUTPUT
RX3 IN
RX4 IN
1000pF
1000pF
DR3 OUT
RX5 IN
RXEN
RECEIVER OUTPUT
DRIVER INPUT
GND
LT1348 • F05
Figure 5. Data Rate Evaluation Circuit
LTC1348 G07
Figure 7. Driver Test Results at 250kbps
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1348
U
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
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
16 15
17
0° – 8°
0.301 – 0.311
(7.65 – 7.90)
0.0256
(0.65)
BSC
0.005 – 0.009
(0.13 – 0.22)
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
5
7
8
1
2
3
4
6
9 10 11 12 13 14
G28 SSOP 0694
SW Package
28-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.697 – 0.712*
(17.70 – 18.08)
0.291 – 0.299**
(7.391 – 7.595)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
0.010 – 0.029
28 27 26 25 24 23 22 21 20 19 18
16 15
17
× 45°
(2.362 – 2.642)
(0.254 – 0.737)
0° – 8° TYP
0.050
(1.270)
TYP
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.009 – 0.013
NOTE 1
0.004 – 0.012
(0.102 – 0.305)
(0.229 – 0.330)
0.014 – 0.019
(0.356 – 0.482)
0.016 – 0.050
(0.406 – 1.270)
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
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
2
3
5
7
8
9
10 11 12 13 14
1
4
6
S28 (WIDE) 0396
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
RELATED PARTS
PART NUMBER
LT1137A
LTC1327
LT1330
DESCRIPTION
COMMENTS
3-DR/5-RX RS232 Transceiver
3-DR/5-RX RS562 Transceiver
3-DR/5-RX RS232
±15kV IEC-801-2 ESD Protection
3.3V Operation
3V Logic Interface
LT1331
3-DR/5-RX RS232/RS562 Transceiver
3-DR/5-RX Micropower RS232 Transceiver
5V RS232 or 3V RS562 Operation
5 Receivers Active in Shutdown
LTC1347
1348fa LT/GP 0197 5K REV A • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1994
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
8
●
●
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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