LT1342CSW#PBF [Linear]
LT1342 - 5V RS232 Transceiver with 3V Logic Interface; Package: SO; Pins: 28; Temperature Range: 0°C to 70°C;
| 型号： | LT1342CSW#PBF |
| 厂家： | 
Linear |
| 描述： | LT1342 - 5V RS232 Transceiver with 3V Logic Interface; Package: SO; Pins: 28; Temperature Range: 0°C to 70°C 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总8页 (文件大小：219K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1342
5V RS232 Transceiver with
3V Logic Interface
U
DESCRIPTIO
EATURE
S
F
The LT®1342 is an advanced low power three-driver, five-
receiver RS232 transceiver. The LT1342 operates from a
5V supply and a 3V logic supply. Receiver outputs can
interface directly to 3V logic circuits. Included on the chip
isashutdownpinforreducingsupplycurrenttonearzero.
All receivers and drivers assume high impedance states
during shutdown.
■
■
■
■
■
■
■
■
■
■
■
■
■
ESD Protection Over ±10kV
3V Logic Interface
Uses Small Capacitors: 0.1µF, 0.2µF
1µA Supply Current in Shutdown
Low Power Driver Disable Operating Mode
Pin Compatible with LT1137A
120kBaud Operation for RL = 3k, CL = 2500pF
250kBaud Operation for RL = 3k, CL = 1000pF
CMOS Comparable Low Power: 60mW
Operates from a 5V Supply and 3V Logic Supply
Easy PC Layout: Flowthrough Architecture
Rugged Bipolar Design
The driver disable function provides additional control of
operating mode. When driver disable is high the charge
pump and drivers turn off. Receivers continue to operate
during driver disable.
New ESD structures on the chip allow the LT1342 to
survive multiple ±10kV strikes, eliminating the need for
costly TransZorbs® on the RS232 line pins.
Outputs Assume a High Impedance State When
Off or Powered Down
Absolutely No Latchup
■
The LT1342 is fully compliant with all EIA RS232 specifi-
cations and operates in excess of 120kbaud even driving
heavy capacitive loads.
O U
PPLICATI
S
A
■
Notebook Computers
Palmtop Computers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI.
■
U
O
TYPICAL APPLICATI
Output Waveforms
+
–
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
RECEIVER
OUTPUT
0.1µF
0.1µF
5V V
CC
2 × 0.1µF
V
L = 3V
3
LT1342
CL = 50pF
2 × 0.1µF
4
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
5
DRIVER 1 OUT
RX1 IN
DRIVER
6
R
OUTPUT
RL = 3k
7
DRIVER 2 OUT
RX2 IN
C
L = 2500pF
TO 3V LOGIC
8
TO LINE
9
RX3 IN
10
11
12
13
14
RX4 IN
DRIVER 3 OUT
RX5 IN
INPUT
ON/OFF
DRIVER DISABLE
LT1342 • TA02
3V V
NC
L
LT1342 • TA01
1
LT1342
W W W
U
/O
ABSOLUTE AXI U RATI GS
PACKAGE RDER I FOR ATIO
(Note 1)
Supply Voltage (VCC) ................................................ 6V
Supply Voltage (VL) .................................................. 6V
V+ ........................................................................ 13.2V
V– ...................................................................... –13.2V
Input Voltage
TOP VIEW
ORDER PART
NUMBER
+
–
V
1
2
3
4
5
6
7
8
9
28
V
–
+
5V V
27 C2
26 C2
CC
+
C1
LT1342CG
LT1342CNW
LT1342CSW
–
C1
25 DRIVER 1 IN
24 RX1 OUT
23 DRIVER 2 IN
22 RX2 OUT
21 RX3 OUT
20 RX4 OUT
19 DRIVER 3 IN
18 RX5 OUT
17 GND
Driver ........................................................... V– to V+
Receiver ................................................ –30V to 30V
Output Voltage
DRIVER 1 OUT
RX1 IN
DRIVER 2 OUT
RX2 IN
Driver .................................................... – 30V to 30V
Receiver .................................... – 0.3V to VCC + 0.3V
Short-Circuit Duration
RX3 IN
RX4 IN 10
DRIVER 3 OUT 11
RX5 IN 12
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
DRIVER
DISABLE
15 NC
ON/OFF 13
16
14
3V V
L
G PACKAGE
NW PACKAGE
28-LEAD PLASTIC SSOP 28-LEAD WIDE PDIP
SW PACKAGE
28-LEAD WIDE PLASTIC SO
TJMAX = 125°C, θJA = 96°C/ W (G)
TJMAX = 125°C, θJA = 56°C/ W (NW)
TJMAX = 125°C, θJA = 85°C/ W (SW)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
+
V Output
8.6
–7
12
V
V
mA
mA
–
V Output
Supply Current (V
Logic Supply Current (V )
)
CC
(Note 3)
(Note 4)
17
1
0.1
L
Supply Current When OFF (V
)
Shutdown (Note 5)
Driver Disable
Shutdown (Note 5)
Driver Disable
●
●
1
3
1
10
µA
mA
µA
mA
CC
Logic Supply Current (V ) When OFF
10
1
L
0.1
Supply Rise Time
Shutdown to Turn-On
C1 = C2 = 0.2µF,
C = C = 0.1µF
0.2
ms
+
–
ON/OFF Pin Thresholds
Input Low Level (Device Shutdown)
Input High Level (Device Enabled)
●
●
1.4
1.4
0.8
V
V
2.4
ON/OFF Pin Current
0V ≤ V
≤ 5V
●
–15
80
µA
ON/OFF
DRIVER DISABLE Pin Thresholds
Input Low Level (Drivers Enabled)
Input High Level (Drivers Disabled)
●
●
1.4
1.4
0.8
V
V
2.4
DRIVER DISABLE Pin Current
Oscillator Frequency
0V ≤ V
≤ 5V
●
–10
500
µA
kHz
DRIVER DISABLE
130
2
LT1342
ELECTRICAL CHARACTERISTICS
(Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing
Load = 3k to GND
Input Low Level (V
Positive
Negative
●
●
5
7.3
– 6.5
1.4
1.4
V
V
V
V
–5
0.8
Logic Input Voltage Level
= High)
= Low)
●
●
OUT
Input High Level (V
2
OUT
Logic Input Current
0.8V ≤ V ≤ 2V
●
5
17
10
20
µA
mA
µA
kBaud
kBaud
IN
Output Short-Circuit Current
Output Leakage Current
Data Rate (Note 8)
V
= 0V
±9
OUT
Shutdown, V
= ±30V (Note 5)
●
100
OUT
R = 3k, C = 2500pF
120
250
L
L
R = 3k, C = 1000pF
L
L
Slew Rate
R = 3k, C = 51pF
15
6
30
V/µs
V/µs
L
L
R = 3k, C = 2500pF
4
L
L
Propagation Delay
Output Transition t High to Low (Note 6)
0.6
0.5
1.3
1.3
µs
µs
HL
Output Transition t Low to High
LH
Any Receiver
Input Voltage Thresholds
Input Low Threshold (V
Input High Threshold (V
= High)
= Low)
0.8
1.3
1.7
0.4
5
V
V
V
kΩ
µA
OUT
2.4
1
7
OUT
Hysteresis
●
●
0.1
3
Input Resistance
Output Leakage Current
Receivers 1 Through 4
Output Voltage
Shutdown (Note 4) 0 ≤ V
≤ V
1
10
OUT
CC
Output Low, I
Output High, I
= –1.6mA
= 160µA
●
●
0.2
2.9
–20
20
250
350
0.4
V
V
mA
mA
ns
ns
OUT
2.7
10
OUT
Output Short-Circuit Current
Propagation Delay
Sinking Current, V
= V
–10
OUT
CC
= 0V
Sourcing Current, V
OUT
Output Transition t High to Low (Note 7)
600
600
HL
Output Transition t Low to High
LH
Receiver 5
Output Voltage
Output Low, I
Output High, I
Sinking Current, V
Sourcing Current, V
Output Transition t High to Low (Note 7)
Output Transition t Low to High
= –500µA
= 160µA
●
●
0.2
2.9
–4
4
1
1
0.4
–2
V
V
mA
mA
µs
µs
OUT
2.7
2
OUT
Output Short-Circuit Current
Propagation Delay
= V
OUT
CC
= 0V
OUT
3
3
HL
LH
The
●
denotes specifications which apply over the full operating
Note 6: For driver delay measurements, R = 3k and C = 51pF. Trigger
L L
temperature range (0°C ≤ T ≤ 70°C for commercial grade).
Note 1: Absolute Maximum Ratings are those values beyond which the life
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t = 1.4V to 0V and t = 1.4V to 0V).
A
HL
LH
of the device may be impaired.
Note 7: For receiver delay measurements, C = 51pF. Trigger points are
L
set between the receiver’s input logic threshold and the output transition
to standard TTL/CMOS logic threshold (t = 1.3V to 2.4V and t = 1.7V
Note 2: Testing done at V = 5V, V = 3.3V and V = 3V.
ON/OFF
CC
L
+
–
HL
LH
Note 3: Supply current is measured with external capacitors C = C
= 0.1µF, C1 = C2 = 0.2µF. All outputs are open with all driver inputs
tied high.
to 0.8V).
Note 8: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
Note 4: V supply current is measured with all receiver outputs high.
L
Note 5: Supply current and leakage measurements in shutdown are
performed with V
disable are performed with V
≤ 0.1V. Supply current measurements using driver
ON/OFF
≥ 3V.
DRIVER DISABLE
3
LT1342
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Driver Output Voltage
Receiver Input Thresholds
Supply Current vs Data Rate
10
8
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
80
70
60
R
= 3k
OUTPUT HIGH
L
3
R
C
DRIVERS ACTIVE
= 3k
= 2500pF
L
L
6
V
V
= 5.5V
= 5V
= 4.5V
CC
V
CC
4
CC
50
40
2
INPUT HIGH
INPUT LOW
0
V
V
= 4.5V
CC
= 5.5V
CC
–2
–4
–6
–8
–10
30
20
10
0
V
= 5V
CC
OUTPUT LOW
–55
0
25
50
75 100 125
–55
0
25
50
75 100 125
–25
–25
0
25
50
75
125 150
100
TEMPERATURE (°C)
TEMPERATURE (°C)
DATA RATE (kBAUD)
LT1342 • TPC01
LT1342 • TPC02
LT1342 • TPC03
Supply Current in Shutdown
Driver Disable Threshold
Supply Current in Driver Disable
5
4
3
2
1
0
150
125
100
75
3.0
2.5
2.0
1.5
50
25
0
1.0
0.5
0
–55
0
25
50
75 100 125
–25
50
TEMPERATURE (°C)
100 125
50
TEMPERATURE (°C)
100 125
–55 –25
0
25
75
–55 –25
0
25
75
TEMPERATURE (°C)
LT1342 • TPC05
LT1342 • TPC04
LT1342 • TPC06
Supply Current
ON/OFF Thresholds
Driver Leakage in Shutdown
3.0
2.5
2.0
1.5
100
10
1
40
35
30
3
DRIVERS LOADED R= 3k
L
2
1
DRIVERS LOADED R= 3k
L
25
20
ON THRESHOLD
DRIVER LOADED R= 3k
L
V
= 30V
NO LOAD
OUT
15
10
5
1.0
0.5
0
V
= –30V
OUT
OFF THRESHOLD
0
0.1
–55 –25
0
25
50
75 100 125
50
125
50
TEMPERATURE (°C)
100 125
–55
0
25
75
–55 –25
0
25
75
100
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
LT1341 • TPC08
LT1342 • TPC07
LT1342 • TPC09
4
LT1342
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Short-Circuit Current
Receiver Short-Circuit Current
50
30
25
20
15
40
30
20
10
0
+
I
RX1 TO RX4
–
SC
I
SC
RX1 TO RX4
+
I
SC
–
–
I
SC
RX5 I
SC
10
5
+
RX5 I
0
SC
0
–55 –25
25
50
75 100 125
50
TEMPERATURE (°C)
100 125
–55 –25
0
25
75
TEMPERATURE (°C)
LT1342 • TPC11
LT1342 • TPC10
Driver Output Waveforms
Receiver Output Waveforms
DRIVER OUTPUT
RL = 3k
RX5 OUTPUT
CL = 50pF
DRIVER OUTPUT
RX1 TO RX4
OUTPUT
R
L = 3k
CL = 2500pF
C
L = 50pF
INPUT
INPUT
LT1342 • TPC13
LT1342 • TPC12
VL = 3V
U
U
U
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled
with a 0.1µF ceramic capacitor close to the package pin.
Insufficient supply bypassing can result in low output
drive levels and erratic charge pump operation.
DRIVER DISABLE: This pin provides an alternate control
for the charge pump and RS232 drivers. A logic high on
thispinshutsdownthechargepumpandplacesalldrivers
in a high impedance state. All five receivers remain active
under these conditions. Floating the DRIVER DISABLE pin
or driving it to a logic low level fully enables the trans-
ceiver. A logic low on the ON/OFF pin supersedes the state
of the DRIVER DISABLE pin. Supply current drops to 3mA
when in driver disable mode.
VL: 3V Logic Supply Pin. Provides power to the receiver
outputs. Decouple with a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: A TTL/CMOS Compatible Operating Mode Con-
trol. Alogiclowputsthedeviceinthelowpowershutdown
mode. Drivers and receivers assume a high impedance
state in shutdown. The transceiver consumes almost no
supply current while in shutdown. A logic high fully
enablesthetransceiver.AnON/OFFlogiclowsignalsuper-
sedes the state of the DRIVER DISABLE pin.
V+: Positive Supply Output (RS232 Drivers). V+ ≈ 2VCC
–
1.5V. This pin requires an external charge storage capaci-
tor C ≥ 0.1µF, tied to ground or VCC. With multiple
transceivers, the V+ and V– pins may be paralleled into
common charge storage capacitors. Larger value capaci-
tors may be used to reduce supply ripple.
5
LT1342
U
U
U
PI FU CTIO S
V–: Negative Supply Output (RS232 Drivers). V– ≈
–(2VCC – 2.5V). This pin requires an external charge DRIVER DISABLE pin is active. Outputs are fully short-
state when in shutdown mode, V = 0V, or when the
CC
–
+
storage capacitor C ≥ 0.1µF. To reduce supply ripple, circuit protected from V + 30V to V – 30V. Applying
increase the size of the storage capacitor.
higher voltages will not damage the device if the over-
drive is moderately current limited. Short circuits on
one output can load the power supply generator and
may disrupt the signal levels of the other outputs. The
driver outputs are protected against ESD to ±10V for
human body model discharges.
C1+,C1–,C2+,C2–:CommutatingCapacitorInputs.These
pins require two external capacitors C ≥ 0.2µF: one from
C1+ to C1–, and another from C2+ to C2–. The capacitor’s
effective series resistance should be less than 2Ω. For
C ≥ 1µF, low ESR tantalum capacitors work well in this
application, although small value ceramic capacitors may
be used with a minimal reduction in charge pump compli-
ance. For operation with an external 12V supply, omit C1
and connect the 12V supply to pin C1+. Pin V+ may also be
shorted to C1+ when a separate supply is used. The 12V
supply must be bypassed with a 0.1F capacitor.
RX IN: Receiver Inputs. These pins accept RS232 level
signals (±30V) into a protected 5k terminating resistor.
ThereceiverinputsareprotectedagainstESDto±10kVfor
human body model discharges. Each receiver provides
0.4V of hysteresis for noise immunity. Open receiver
inputs assume a logic low state.
DRIVER IN: RS232 Driver Input Pins. These inputs are
compatible with TTL or CMOS logic. Tie unused inputs to
VCC or VL.
RX OUT: Receiver Outputs with 3.3V Logic Compatible
Voltage Levels. Outputs are in a high impedance state
when in shutdown mode to allow data line sharing.
Outputs are fully short-circuit protected to ground or VCC
or VL with the power on, off, or in shutdown mode.
Receiver output level is determined by VL supply voltage.
Use VL = 3.3V for interfacing with 3.3V logic, VL = 5V for
interfacing with 5V logic.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Driver output swing meets RS232 levels for loads up to
3k. Slew rates are controlled for lightly loaded lines.
Output current capability is sufficient for load condi-
tions up to 2500pF. Outputs are in a high impedance
U
ESD PROTECTIO
ESD Test Circuit
The RS232 line inputs of the LT1342 have on-chip protec-
tion from ESD transients up to ±10kV. The protection
structures act to divert the static discharge safely to
systemground. InorderfortheESDprotectiontofunction
effectively, the power supply and ground pins of the
LT1342 must be connected to ground through low imped-
ances.Thepowersupplydecouplingcapacitorsandcharge
pump storage capacitors provide this low impedance in
normalapplicationofthecircuit.Theonlyconstraintisthat
low ESR capacitors must be used for bypassing and
charge storage. ESD testing must be done with pins VCC,
V+, V– and GND shorted to ground or connected with low
ESR capacitors.
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
5V V
LT1342
CC
0.1µF
0.2µF
0.1µF
0.1µF
0.2µF
3
4
DRIVER 1 IN
RX1 OUT
5
DRIVER 1 OUT
RX1 IN
6
DRIVER 2 IN
RX2 OUT
7
DRIVER 2 OUT
RX2 IN
8
RS232
RX3 OUT
LINE PINS
PROTECTED
TO ±10kV
9
RX3 IN
RX4 OUT
10
11
12
13
14
RX4 IN
DRIVER 3 IN
RX5 OUT
DRIVER 3 OUT
RX5 IN
GND
DRIVER DISABLE
ON/OFF
3V V
L
NC
LT1342 • ESD TC
0.1µF
6
LT1342
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
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)
2827262524232221201918 1615
17
0° – 8°
0.301 – 0.311
(7.65 – 7.90)
0.0256
(0.65)
BSC
0.022 – 0.037
(0.55 – 0.95)
0.005 – 0.009
(0.13 – 0.22)
0.010 – 0.015
(0.25 – 0.38)
0.002 – 0.008
(0.05 – 0.21)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
G28 SSOP 0694
5
7
8
1
2
3
4
6
9 101112 13 14
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
0.070
1.455*
(1.778)
TYP
(36.957)
MAX
0.045 – 0.065
(1.143 – 1.651)
0.150 ± 0.005
(3.810 ± 0.127)
0.600 – 0.625
(15.240 – 15.875)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.015
(0.381)
MIN
0.009 – 0.015
(0.229 – 0.381)
0.505 – 0.560*
(12.827 – 14.224)
+0.035
–0.015
0.625
0.125
(3.175)
MIN
0.035 – 0.080
(0.889 – 2.032)
0.018 ± 0.003
(0.457 ± 0.076)
+0.889
15.87
1
2
3
5
7
9
4
6
8
10 11 12 13 14
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
N28 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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
(2.362 – 2.642)
0.010 – 0.029
(0.254 – 0.737)
28 27 26 25 24 23 22 21 20 19 18
17
16 15
× 45°
0° – 8° TYP
0.394 – 0.419
(10.007 – 10.643)
0.050
NOTE 1
(1.270)
0.009 – 0.013
TYP 0.014 – 0.019
0.004 – 0.012
(0.102 – 0.305)
(0.229 – 0.330)
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
(0.356 – 0.482)
TYP
NOTE:
2
3
5
7
8
9 10 11 12 13 14
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
1
4
6
S28 (WIDE) 0996
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
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
LT1342
TYPICAL APPLICATIO S
U
Operation Using 5V and 12V Power Supplies
–
+
V
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
LT1342
CC
+
0.1µF
5V V
CC
2 × 0.1µF
C1
C1
3
+
12V V
0.1µF
4
–
0.1µF
DRIVER 1 IN
RX1 OUT
DRIVER 2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DRIVER 3 IN
RX5 OUT
GND
5
DRIVER 1 OUT
RX1 IN
6
7
DRIVER 2 OUT
RX2 IN
TO LOGIC
8
TO
LINE
9
RX3 IN
10
11
12
13
14
RX4 IN
DRIVER 3 OUT
RX5 IN
ON/0FF = 5V
DRIVER DISABLE
NC
3V V
L
0.1µF
LT1342 • TA03
Typical Mouse Driving Application
–
+
V
1
2
28
27
26
V
LT1342
0.1µF
2 × 0.1µF
5V V
0.1µF
CC
2 × 0.1µF
MOUSE
3
4
25 DRIVER 1 IN
LOGIC “0”
LOGIC “0”
+
V
5
24
DRIVER 1 OUT
RX1 IN
RX1 OUT
LOGIC
6
23 DRIVER 2 IN
DCD
DSR
RX
(1)
7
22
DRIVER 2 OUT
RX2 IN
RX2 OUT
8
21 RX3 OUT
MOUSE DATA
LOGIC “1”
9
20
RTS
TX
RX3 IN
RX4 OUT
OPTICS
10
11
12
13
14
19 DRIVER 3 IN
RX4 IN
–
18
CTS
DTR
RI
DRIVER 3 OUT
RX5 IN
V
RX5 OUT
17
GND
16
ON/OFF
DRIVER DISABLE
NC
(9)
(5)
15
3V V
L
DB9
LT1342 • TA04
RELATED PARTS
PART NUMBER
LT1137A
LTC1327
LT1330
DESCRIPTION
COMMENTS
±15kV IEC-1000-4-2 ESD Protection
3.3V Operation
3-DR/5-RX RS232 Transceiver
3-DR/5-RX RS562 Transceiver
3-DR/5-RX RS232
3V Logic Interface
LT1331
3-DR/5-RX RS232/RS562 Transceiver
5V RS232 or 3V RS562 Operation
5 Receivers Active in Shutdown
True RS232 from 3V
LTC1347
LTC1348
3-DR/5-RX Micropower RS232 Transceiver
3-DR/5-RX RS232 Transceiver
1342fa LT/TP 1098 REV A 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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