LTC1345INW#PBF [Linear]
IC LINE TRANSCEIVER, PDIP28, 0.600 INCH, PLASTIC, DIP-28, Line Driver or Receiver;
| 型号： | LTC1345INW#PBF |
| 厂家： | 
Linear |
| 描述： | IC LINE TRANSCEIVER, PDIP28, 0.600 INCH, PLASTIC, DIP-28, Line Driver or Receiver 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总12页 (文件大小：212K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1345
Single Supply
V.35 Transceiver
U
FEATURES
DESCRIPTIO
The LTC®1345 is a single chip transceiver that provides the
differential clock and data signals for a V.35 interface from
a single 5V supply. Combined with an external resistor
termination network and an LT®1134A RS232 transceiver
for the control signals, the LTC1345 forms a complete low
power DTE or DCE V.35 interface port operating from a
single 5V supply.
■
Single Chip Provides All V.35 Differential Clock
and Data Signals
■
Operates From Single 5V Supply
■
Software Selectable DTE or DCE Configuration
■
Transmitters and Receivers Will Withstand
Repeated ±10kV ESD Pulses
■
Shutdown Mode Reduces ICC to 1µA Typ
■
10MBaud Transmission Rate
The LTC1345 features three current output differential
transmitters, three differential receivers, and a charge
pump. The transceiver can be configured for DTE or DCE
operation or shut down using two Select pins. In the
Shutdown mode, the supply current is reduced to 1µA.
■
Transmitter Maintains High Impedance When
Disabled, Shut Down, or with Power Off
■
Meets CCITT V.35 Specification
■
Transmitters are Short-Circuit Protected
U
The transceiver operates up to 10Mbaud. All transmitters
feature short-circuit protection and a Receiver Output
Enable pin allows the receiver outputs to be forced into a
high impedance state. Both transmitter outputs and re-
ceiver inputs feature ±10kV ESD protection. The charge
pump features a regulated VEE output using three external
1µF capacitors.
APPLICATIO S
■
Modems
■
Telecommunications
■
Data Routers
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Clock and Data Signals for V.35 Interface
1µF
1µF
1µF
1µF
DTE
DCE
V
CC1
5V
V
CC2
5V
4
2
1
28
28
1
2
4
3
27
27
3
BI
BI
LTC1345
DX
LTC1345
RX
1µF
1µF
1µF
1µF
627T500/1250
627T500/1250
TXD (103)
26
1
12
18
6
7
12
13
6
T
T
T
T
T
T
T
T
T
T
25
24
11
10
17
16
2
3
SCTE (113)
TXC (114)
RXC (115)
RXD (104)
DX
RX
DX
DX
DX
23
20
9
1
15
26
4
14
11
12
13
RX
RX
RX
19
18
2
3
25
24
13
12
7
8
17
16
4
5
23
22
11
10
50Ω
50Ω
125Ω
=
T
15
5
6
7
21
5
9
7
BI TECHNOLOGIES
627T500/1250 (SOIC) OR
899TR50/125 (DIP)
GND (102)
8
8
9
10 14
9
10
14
LTC1345 • TA01
V
V
CC2
CC1
1
LTC1345
W W
U W
U W
U
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
ORDER PART
Supply Voltage, VCC .................................................. 6V
Input Voltage
Transmitters ........................... –0.3V to (VCC + 0.3V)
Receivers............................................... –18V to 18V
S1, S2, OE ............................... –0.3V to (VCC + 0.3V)
Output Voltage
Transmitters .......................................... –18V to 18V
Receivers................................ –0.3V to (VCC + 0.3V)
VEE........................................................ –10V to 0.3V
Short-Circuit Duration
Transmitter Output ..................................... Indefinite
Receiver Output.......................................... Indefinite
VEE................................................................. 30 sec
Operating Temperature Range
+
+
–
NUMBER
C2
C1
V
1
2
3
4
5
6
7
8
9
28 C2
27
V
EE
LTC1345CNW
LTC1345CSW
LTC1345INW
LTC1345ISW
26 Y1
25 Z1
24 Y2
23 Z2
22 Y3
21 Z3
20 B3
19 A3
18 B2
17 A2
16 B1
15 A1
CC
–
C1
GND
T1
T2
T3
S1
S2 10
R3 11
R2 12
R1 13
OE 14
Commercial ............................................ 0°C to 70°C
Industrial ........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
NW PACKAGE
28-LEAD PDIP
SW PACKAGE
28-LEAD PLASTIC SO
THREE V.35 TRANSMITTERS AND THREE RECEIVERS
JMAX = 125°C, θJA = 56°C/W (NW)
JMAX = 125°C, θJA = 65°C/W (SW)
T
T
Consult factory for Military grade parts.
DC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5% (Notes 2, 3), unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
Figure 1, –4V ≤ V ≤ 4V
MIN
0.44
–0.6
–12.6
9.4
TYP
0.55
0
MAX
0.66
0.6
UNITS
V
V
V
Transmitter Differential Output Voltage
Transmitter Common-Mode Output Voltage
Transmitter Output High Current
Transmitter Output Low Current
Transmitter Output Leakage Current
Transmitter Output Impedance
Differential Receiver Input Threshold Voltage
Receiver Input Hysterisis
●
●
●
●
●
OD
OC
OS
Figure 1, V = 0V
V
OS
I
I
I
V
V
= 0V
= 0V
–11
11
–9.4
12.6
±100
mA
mA
µA
kΩ
mV
mV
mA
kΩ
V
OH
Y, Z
Y, Z
OL
OZ
S1 = S2 = 0V, –5V ≤ V ≤ 5V
±1
Y, Z
R
O
–2V ≤ V ≤ 2V
100
25
Y, Z
V
–7V ≤ (V + V )/2 ≤ 7V
●
200
0.4
TH
A
B
∆V
TH
–7V ≤ (V + V )/2 ≤ 7V
50
A
B
I
Receiver Input Current (A, B)
Receiver Input Impedance
–7V ≤ V
–7V ≤ V
≤ 7V
●
●
●
●
●
●
●
●
●
IN
A, B
A, B
R
IN
≤ 7V
17.5
3
30
4.5
0.2
V
V
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Output Short-Circuit Current
Receiver Three-State Output Current
Logic Input High Voltage
I = 4mA, V
= 0.2V
OH
OL
O
B, A
B, A
I = 4mA, V
O
= –0.2V
0.4
85
V
I
I
0V ≤ V ≤ V
CC
7
2
mA
µA
V
OSR
OZR
O
S1 = S2 = 0V, 0V ≤ V ≤ V
±10
O
CC
V
V
T, S1, S2, OE
T, S1, S2, OE
T, S1, S2, OE
IH
IL
Logic Input Low Voltage
0.8
V
I
I
Logic Input Current
±10
µA
IN
CC
V
Supply Current
Figure 1, V = 0, S1 = S2 = HIGH
●
●
●
118
19
1
170
30
100
mA
mA
µA
CC
OS
No Load, S1 = S2 = HIGH
Shutdown, S1 = S2 = 0V
V
V
Voltage
No Load, S1 = S2 = HIGH
–5.5
V
EE
EE
2
LTC1345
AC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V ±5% (Notes 2, 3), unless otherwise specified.
SYMBOL
t , t
PARAMETER
CONDITIONS
Figures 1 and 3, V = 0V
MIN
TYP
7
MAX
UNITS
ns
Transmitter Rise or Fall Time
Transmitter Input to Output
Transmitter Input to Output
Transmitter Output to Output
Receiver Input to Output
Receiver Input to Output
●
●
●
40
70
70
R
F
OS
t
t
t
t
t
t
t
t
t
t
f
Figures 1 and 3, V = 0V
25
25
0
ns
PLH
OS
Figures 1 and 3, V = 0V
ns
PHL
SKEW
PLH
PHL
SKEW
ZL
OS
Figures 1 and 3, V = 0V
ns
OS
Figures 1 and 4, V = 0V
●
●
49
52
3
100
100
ns
OS
Figures 1 and 4, V = 0V
ns
OS
Differential Receiver Skew, t
– t
PHL
Figures 1 and 4, V = 0V
ns
PLH
OS
Receiver Enable to Output LOW
Receiver Enable to Output HIGH
Receiver Disable From LOW
Receiver Disable From HIGH
Figures 2 and 5, C = 15pF, S1 Closed
●
●
●
●
40
35
30
35
200
15
70
70
70
70
ns
L
Figures 2 and 5, C = 15pF, S2 Closed
ns
ZH
L
Figures 2 and 5, C = 15pF, S1 Closed
ns
LZ
L
Figures 2 and 5, C = 15pF, S2 Closed
ns
HZ
L
Charge Pump Oscillator Frequency
Maximum Data Rate (Note 4)
kHz
Mbaud
OSC
BR
MAX
●
10
Note 1: The absolute maximum ratings are those values beyond which the
safety of the device cannot be guaranteed.
Note 3: All typicals are given for V = 5V, C1 = C2 = C3 = 1µF ceramic
CC
capacitors and T = 25°C.
A
Note 2: All currents into device pins are termed positive; all currents out of
device pins are termed negative. All voltages are referenced to device
ground unless otherwise specified.
Note 4: Maximum data rate is specified for NRZ data encoding scheme.
The maximum data rate may be different for other data encoding schemes.
Data rate is guaranteed by correlation and is not tested.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Transmitter Output Current
vs Output Voltage
Transmitter Output Skew
vs Temperature
Transmitter Output Current
vs Temperature
13
12
20
15
13
12
11
10
9
V
CC
= 5V
V
CC
= 5V
T
= 25°C
CC
A
V
= 5V
11
10
9
10
5
0
–25
0
50
75 100 125
0
0.5
–25
0
50
75 100 125
–50
25
–2.0 –1.5 –1.0 –0.5
1.0 1.5 2.0
–50
25
TEMPERATURE (˚C)
OUTPUT VOLTAGE (V)
TEMPERATURE (˚C)
LTC1345 • TPC01
LTC1345 • TPC02
LTC1345 • TPC03
3
LTC1345
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver tPLH – tPHL
vs Temperature
Supply Current vs Temperature
VEE Voltage vs Temperature
20
15
140
120
30
25
–4.5
–5.0
V
CC
= 5V
V
= 5V
V
CC
= 5V
CC
LOADED
NO LOAD
10
5
100
80
20
15
10
–5.5
–6.0
–6.5
0
60
–25
0
50
75 100 125
–25
0
50
75 100 125
–25
0
50
75 100 125
–50
25
–50
25
–50
25
TEMPERATURE (˚C)
TEMPERATURE (˚C)
TEMPERATURE (˚C)
LTC1345 • TPC04
LTC1345 • TPC05
LTC1345 • TPC06
Transmitter Output Waveforms
Receiver Output Waveforms
INPUT
5V/DIV
INPUT
0.2/DIV
OUTPUT
0.2V/DIV
OUTPUT
5V/DIV
LTC1345 • TPC07
LTC1345 • TPC08
U
U
U
PI FU CTIO S
C2+ (Pin 1): Capacitor C2 Positive Terminal.
C1+ (Pin 2): Capacitor C1 Positive Terminal.
VCC (Pin 3): Positive Supply, 4.75 ≤ VCC ≤ 5.25V.
C1– (Pin 4): Capacitor C1 Negative Terminal.
R3 (Pin 11): Receiver 3 Output.
R2 (Pin 12): Receiver 2 Output.
R1 (Pin 13): Receiver 1 Output.
OE (Pin 14): Receiver Output Enable.
GND (Pin 5): Ground. The positive terminal of C3 is
A1 (Pin 15): Receiver 1 Inverting Input.
B1 (Pin 16): Receiver 1 Noninverting Input.
A2 (Pin 17): Receiver 2 Inverting Input.
B2 (Pin 18): Receiver 2 Noninverting Input.
A3 (Pin 19): Receiver 3 Inverting Input.
B3 (Pin 20): Receiver 3 Noninverting Input.
Z3 (Pin 21): Transmitter 3 Inverting Output.
connected to ground.
T1 (Pin 6): Transmitter 1 Input.
T2 (Pin 7): Transmitter 2 Input.
T3 (Pin 8): Transmitter 3 Input.
S1 (Pin 9): Select Input 1.
S2 (Pin 10): Select Input 2.
4
LTC1345
U
U
U
PI FU CTIO S
Y3 (Pin 22): Transmitter 3 Noninverting Output.
Z2 (Pin 23): Transmitter 2 Inverting Output.
Y2 (Pin 24): Transmitter 2 Noninverting Output
Z1 (Pin 25): Transmitter 1 Inverting Output.
Y1 (Pin 26): Transmitter 1 Noninverting Output.
VEE (Pin27):ChargePumpOutput.Connectedtonegative
terminal of capacitor C3.
C2– (Pin 28): Capacitor C2 Negative Terminal.
U
U
FU CTIO TABLES
Receiver
Transmitter and Receiver Configuration
INPUTS
CONFIGURATION S1 S2 OE
OUTPUTS
R1 AND R2
S1
0
S2
0
TX#
—
RX#
—
REMARKS
B – A
≥0.2V
≤–0.2V
≥0.2V
≤–0.2V
X
R3
1
Shutdown
DTE or All ON
DTE or All ON
DCE
X
X
1
1
X
0
1
1
0
0
X
0
0
0
0
0
1
X
1
0
1
0
Z
Z
1
0
1, 2, 3
1, 2
1, 2
DCE Mode, RX3 Shut Down
DTE Mode, TX3 Shut Down
All Active
0
0
1
1, 2, 3
1, 2, 3
Z
1
1
1, 2, 3
DCE
Z
Disabled
Shutdown
Z
Transmitter
X
Z
INPUTS
CONFIGURATION S1 S2
OUTPUTS
T
0
1
0
1
X
Y1 AND Y2 Z1 AND Z2 Y3 Z3
DTE
0
0
1
1
0
1
1
X
X
0
0
1
0
1
Z
1
0
1
0
Z
Z
Z
0
1
Z
Z
Z
1
0
Z
DTE
DCE or All ON
DCE or All ON
Shutdown
TEST CIRCUITS
V
CC
Y
S1
50Ω
50Ω
50Ω
1k
V
OS
RECEIVER
OUTPUT
Y
125Ω
T
B
A
125Ω
R
V
OD
Z
S2
C
L
OE
15pF
50Ω
V
= (V + V )/2
Y Z
OC
LTC1345 • F02
LTC1345 • F01
Z
Figure 1. V.35 Transmitter/Receiver Test Circuit
Figure 2. Receiver Output Enable/Disable Timing Test Load
5
LTC1345
U
W
W
SWITCHI G TI E WAVEFOR S
3V
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
1.5V
1.5V
T
0V
t
t
PHL
PLH
V
O
90%
90%
V
= V(Y) – V(Z)
DIFF
Y – Z
–V
50%
10%
50%
10%
O
1/2 V
O
t
t
f
r
Z
V
O
Y
t
t
SKEW
LTC1345 • F03
SKEW
Figure 3. V.35 Transmitter Propagation Delays
V
ID
f = 1MHz: t ≤ 10ns: t ≤ 10ns
INPUT
r
f
0V
t
0V
t
B – A
–V
ID
PLH
PHL
V
OH
OUTPUT
R
1.5V
1.5V
V
OL
LTC1345 • F04
Figure 4. V.35 Receiver Propagation Delays
3V
1.5V
1.5V
OE
R
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
0V
5V
t
t
LZ
ZL
1.5V
1.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0.5V
V
OL
t
t
ZH
HZ
V
OH
0.5V
R
0V
LTC1345 • F05
Figure 5. Receiver Enable and Disable Times
6
LTC1345
W U U
APPLICATIO S I FOR ATIO
Review of CCITT Recommendation V.35
Electrical Specifications
U
Cable Termination
Each end of the cable connected to an LTC1345 must be
terminated by either one of two electrically equivalent
external Y or ∆ resistor networks for proper operation. The
Y-termination has two series connected 50Ω resistors and
a 125Ω resistor connected between ground and the center
tap of the two 50Ω resistors as shown in Figure 6A.
V.35 is a CCITT recommendation for synchronous data
transmission via modems. Appendix 2 of the recommen-
dation describes the electrical specifications which are
summarized below:
1. The interface cable is balanced twisted-pair with 80Ω to
120Ω impedance.
50Ω
2.Thetransmitter’ssourceimpedanceisbetween50Ωand
150Ω.
125Ω
50Ω
3. The transmitter’s resistance between shorted terminals
and ground is 150Ω ±15Ω.
A
4. When terminated by a 100Ω resistive load, the terminal-
to-terminal voltage should be 0.55V ±20%.
300Ω
120Ω
5. The transmitter’s rise time should be less than 1% of the
signal pulse or 40ns, whichever is greater.
300Ω
LTC1345 • F06
B
6. The common-mode voltage at the transmitter output
should not exceed 0.6V.
Figure 6. Y and ∆ Termination Networks
The alternative ∆-termination has a 120Ω resistor across
the twisted wires and two 300Ω resistors between each
wire and ground as shown in Figure 6B. Standard 1/8W,
5%surfacemountresistorscanbeusedforthetermination
network. To maintain the proper differential output swing,
the resistor tolerance must be 5% or less. A termination
network that combines all the resistors into an SO-14
package is available from:
7. The receiver impedance is 100Ω ±10Ω.
8. The receiver impedance to ground is 150Ω ±15Ω.
9. The transmitter or receiver should not be damaged by
connection to earth ground, short-circuiting, or cross
connection to other lines.
10. No data errors should occur with ±2V common-mode
change at either the transmitter or receiver, or ±4V ground
potential difference between transmitter and receiver.
BI Technologies (Formerly Beckman Industrial)
Resistor Networks
4200 Bonita Place
Fullerton, CA 92635
Phone: (714) 447-2357
FAX: (714) 447-2500
Part #: BI Technologies 627T500/1250 (SOIC)
899TR50/125 (DIP)
7
LTC1345
W U U
U
APPLICATIO S I FOR ATIO
may be forced into a high impedance state by pulling the
output enable (OE) pin high. For normal operation OE
should be pulled low.
Theory of Operation
The transmitter output consists of complementary
switched-current sources as shown in Figure 7.
A charge pump generates the regulated negative supply
voltage (VEE) with three 1µF capacitors. Commutating
capacitors C1 and C2 form a voltage doubler and inverter
while C3 acts as a reservoir capacitor. To insure proper
operation, the capacitors must have an ESR less than 1Ω.
Monolithic ceramic or solid tantalum capacitors are good
choices. Under light loads, regulation at about –5.2V is
provided by a pulse-skipping scheme. Under heavy loads
thechargepumpisoncontinuously.Asmallrippleofabout
500mV will be present on VEE.
CHIP
V
BOUNDARY
CC
11mA
Y
Z
50Ω
50Ω
125Ω
T
Two Select pins, S1 and S2, configure the chip for DTE,
DCE, all transmitters and receivers on, or Shutdown. In
Shutdown mode, ICC drops to 1µA. The outputs of the
transmitters and receivers are in high impedance states,
the charge pump stops and VEE is clamped to ground.
11mA
V
EE
LTC1345 • F07
Figure 7. Simplified Transmitter Schematic
ESD Protection
With a logic zero at the transmitter input, the inverting
output Z sources 11mA and the noninverting output Y
sinks 11mA. The differential transmitter output voltage is
then set by the termination resistors. With two differential
50Ω resistors at each end of the cable, the voltage is set to
(50Ω × 11mA) = 0.55V. With a logic 1 at the transmitter
input, output Z sinks 11mA and Y sources 11mA. The
common-mode voltage of Y and Z is 0V when both current
sources are matched and there is no ground potential
difference between the cable terminations. The transmitter
current sources have a common-mode range of ±2V,
which allows for a ground difference between cable termi-
nations of ±4V.
LTC1345 transmitter outputs and receiver inputs have on-
chip protection from multiple ±10kV ESD transients. ESD
testing is done using the Human Body ESD Model. ESD
testingmustbedonewithanACgroundontheVCC andVEE
supply pins. The low ESR supply decoupling and VEE
reservoir capacitors provide this AC ground during normal
operation.
Complete V.35 Port
Figure 8 shows the schematic of a complete surface
mounted, single 5V DTE and DCE V.35 port using only
three ICs and eight capacitors per port. The LTC1345 is
used to transmit the clock and data signals, and the
LT1134A to transmit the control signals. If test signals
140, 141, and 142 are not used, the transmitter inputs
should be tied to VCC.
Each receiver input has a 30k resistance to ground and
requiresexternalterminationtomeettheV.35inputimped-
ance specification. The receivers have an input hysteresis
of 50mV to improve noise immunity. The receiver output
8
LTC1345
U
W U U
APPLICATIONS INFORMATION
50Ω
50Ω
1µF
1µF
1µF
1µF
DTE
DCE
125Ω
=
T
V
V
CC2
5V
CC1
5V
4
2
1
28
28
1
2
4
3
27
26
27
3
BI
BI
627T500/
1250
627T500/
1250
1µF
1µF
LTC1345
DX
LTC1345
RX
1µF
1µF
TXD (103)
(SOIC)
(SOIC)
1
P
P
12
18
6
7
12
13
6
T
T
T
T
T
T
T
T
T
T
25
24
11
10
17
16
2
3
S
U
S
U
SCTE (113)
TXC (114)
RXC (115)
RXD (104)
DX
RX
DX
DX
DX
23
20
9
1
15
26
4
W
W
AA
AA
14
11
12
13
RX
RX
RX
19
18
2
3
25
24
13
12
Y
X
Y
X
7
8
V
T
V
T
17
16
4
5
23
22
11
10
15
5
6
7
21
5
9
7
R
R
GND (102)
B
A
B
A
8
8
9
10 14
9
10 14
CABLE SHIELD
V
V
CC2
CC1
0.2µF
0.2µF
0.2µF
0.2µF
4
3
22 23
4
3
22 23
1
24
1
24
LT1134A
LT1134A
0.1µF
0.1µF
0.1µF
0.1µF
2
DTR (108)
RTS (105)
DSR (107)
CTS (106)
DCD (109)
H
C
H
C
21
5
6
8
20
18
21
19
17
15
16
14
DX
DX
RX
RX
RX
RX
DX
DX
RX
RX
DX
DX
DX
DX
RX
RX
19
20
18
16
14
17
15
7
E
E
6
5
D
F
D
F
8
7
10
12
9
9
TM (142)
RDL (140)
LLB (141)
NN
N
L
NN
N
L
11
10
12
11
13
13
ISO 2593
34-PIN DTE/DCE
ISO 2593
34-PIN DTE/DCE
LTC1345 • TA08
INTERFACE CONNECTOR INTERFACE CONNECTOR
Figure 8. Complete Single 5V V.35 Interface
9
LTC1345
U
W U U
APPLICATIONS INFORMATION
RS422/RS485 Applications
5
0
RECEIVER
OUTPUT
5V/DIV
The receivers on the LTC1345 are ideal for RS422 and
RS485 applications. Using the test circuit in Figure 9, the
LTC1345 receivers are able to successfully reconstruct
the data stream with the common-mode voltage meeting
RS422 and RS485 requirements (12V to –7V).
0V
–5V
RECEIVER
A
B
Figures 10 and 11 show that the LTC1345 receivers are
verycapableofreconstructingdataatratesupto10Mbaud.
INPUT
–10V
5V/DIV
V
V
CC2
5V
CC1
LTC1345 • F10
5V
Figure 10. –7V Common Mode
A
BX
TTL
OUT
LTC485
100Ω
100Ω LTC1345
B
AX
RECEIVER
B
GND
GND
15V
10V
5V
INPUT
A
+
–
TTL
IN
5V/DIV
12V TO –7V
COMMON-MODE VOLTAGE
LTC1345 • F09
Figure 9 RS422/RS485 Receiver Interface
0V
5
0
RECEIVER
OUTPUT
5V/DIV
LTC1345 • F11
Figure 11. 12V Common Mode
10
LTC1345
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
1.455*
(36.957)
MAX
28
27
26
25
24
23
22
21
20
19
18
17
16
15
0.505 – 0.560*
(12.827 – 14.224)
1
2
3
5
7
9
4
6
8
10
11
12
13
14
0.600 – 0.625
(15.240 – 15.875)
0.045 – 0.065
(1.143 – 1.651)
0.150 ± 0.005
(3.810 ± 0.127)
0.015
(0.381)
MIN
0.070
(1.778)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.625
0.035 – 0.080
(0.889 – 2.032)
–0.015
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
+0.889
15.87
(
)
–0.381
0.100
(2.54)
BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N28 1098
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.
11
LTC1345
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
SW Package
28-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.697 – 0.712*
(17.70 – 18.08)
28 27 26 25 24 23 22 21 20 19 18
16 15
17
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
0.291 – 0.299**
(7.391 – 7.595)
2
3
5
7
8
9
10 11 12 13 14
1
4
6
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
0.010 – 0.029
(0.254 – 0.737)
× 45°
0° – 8° TYP
0.050
(1.270)
BSC
0.004 – 0.012
(0.102 – 0.305)
0.009 – 0.013
NOTE 1
(0.229 – 0.330)
0.014 – 0.019
(0.356 – 0.482)
TYP
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
S28 (WIDE) 1098
*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
RELATED PARTS
PART NUMBER
LTC1334
DESCRIPTION
COMMENTS
Single 5V RS232/RS485 Multiprotocol Transceiver
Software-Selectable Multiprotocol Transceiver
Two RS485 Driver/Receiver or Four RS232 Driver/Receiver Pairs
4-Driver/4-Receiver for Data and Clock Signals
LTC1343
LTC1344/LTC1344A Software-Selectable Cable Terminator
Perfect for Terminating the LTC1543 (Not Needed with LTC1546)
3-Driver/3-Receiver for Data and Clock Signals
LTC1346
LTC1387
LTC1543
Dual Supply V.35 Transceiver
RS232/RS485 Multiprotocol Transceiver
Software-Selectable Multiprotocol Transceiver
One RS485 Driver/Receiver or Two RS232 Driver/Receiver Pairs
Terminated with LTC1344A for Data and Clock Signals, Companion to
LTC1544 or LTC1545 for Control Signals
LTC1544
LTC1545
Software-Selectable Multiprotocol Transceiver
Software-Selectable Multiprotocol Transceiver
Companion to LTC1546 or LTC1543 for Control Signals Including LL
5-Driver/5-Receiver Companion to LTC1546 or LTC1543
for Control Signals Including LL, TM and RL
LTC1546
Multiprotocol Transceiver with Termination
Combines LTC1543 and LTC1344A Functions for Data and Clock Signals
1345fa LT/TP 0400 2K REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
LINEAR TECHNOLOGY CORPORATION 1995
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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