LTC1335CSW#TR [Linear]
LTC1335 - RS232/EIA562/RS485 Transceivers; Package: SO; Pins: 24; Temperature Range: 0°C to 70°C;型号: | LTC1335CSW#TR |
厂家: | Linear |
描述: | LTC1335 - RS232/EIA562/RS485 Transceivers; Package: SO; Pins: 24; Temperature Range: 0°C to 70°C 驱动 光电二极管 驱动器 |
文件: | 总20页 (文件大小:356K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC1321/LTC1322/LTC1335
RS232/EIA562/RS485
Transceivers
U
DESCRIPTIO
EATURE
S
F
■
The LTC1321/LTC1322/LTC1335 are low power CMOS
bidirectionaltransceivers,eachfeaturingtworeconfigurable
interface ports. Each can be configured as two RS485
differential ports, as two single-ended ports, or as one
RS485 differential port and one single-ended port. The
LTC1321/LTC1322canprovideRS232orEIA562compat-
ible single-ended outputs; the LTC1335 provides EIA562
compatible outputs and additionally includes an output
enable pin, allowing the receiver logic level outputs to be
three-stated.
LTC1321: 2-EIA562/RS232 Transceivers/2-RS485
Transceivers
LTC1322: 4-EIA562/RS232 Transceivers/2-RS485
Transceivers
LTC1335: 4-EIA562 Transceivers/2-RS485
Transceivers with OE
■
■
■
LTC1321/LTC1322 Have the Same Pinout as
SP301/SP302
■
■
■
■
■
■
■
■
LTC1335 Features Receiver Three-State Outputs
Low Supply Current: 1mA Typical
15µA Supply Current in Shutdown
120kBaud in EIA/TIA-562 or RS232 Mode
10MBaud in RS485/RS422 Mode
Self-Testing Capability in Loopback Mode
Power-Up/Down Glitch-Free Outputs
Driver Maintains High Impedance in Three-State,
Shutdown or With Power Off
The RS232/EIA562 transceivers operate to 120kbaud and
are in full compliance with EIA/TIA-562 specification. The
RS485 transceivers operate to 10Mbaud and are in full
compliance with RS485 and RS422 specifications. All
interface drivers feature short-circuit and thermal shut-
down protection. An enable pin allows RS485 driver
outputs to be forced into high impedance which is main-
tained even when the outputs are forced beyond supply
rails or power is off. Both driver outputs and receiver
inputs feature ±10kV ESD protection. A loopback mode
connects the driver outputs back to the receiver inputs for
diagnostic self-test.
■
■
■
Thermal Shutdown Protection
I/O Lines Can Withstand ±25V
Withstands Repeated 10kV ESD Pulses
U
APPLICATIONS
Low Power RS485/RS422/EIA562/RS232 Interface
Cable Repeater
■
■
■
The LTC1321/LTC1322 can support RS232 voltage levels
when 6.5V ≤ VDD ≤ 10V and –6.5V ≥ VEE ≥ –10V. The
LTC1335 supports receiver output enable but not RS232
levels. A shutdown mode reduces the ICC supply current
to 15µA.
Level Translator
U
O
TYPICAL APPLICATI
24
1
15
V
24
1
V
CC2
CC1
5V
5V
11
10
2
3
22
RS485 INTERFACE
RX OUT
RX OUT
21
20
16
17
120Ω
DR ENABLE
120Ω
DR ENABLE
DR IN
9
4
DR IN
8
7
5
4000-FT 24-GAUGE TWISTED PAIR
EIA562 INTERFACE
19
18
22
23
20
21
13
19
18
17
16
15
14
13
6
5V
5V
5V
0V
5V
5V
5V
0V
LTC1322
6
LTC1322
7
3
2
8
RX OUT
RX OUT
DR IN
DR IN
DR IN
RX OUT
RX OUT
9
5
10
11
4
DR IN
12
12
V
V
EE2
EE1
–5V
–5V
1321/22/35 TA01
1
LTC1321/LTC1322/LTC1335
W W W
U
ABSOLUTE AXI U RATI GS
Supply Voltage
Output Voltage
VCC .................................................................... 6.5V
VDD (LTC1321/LTC1322 Only) ........................... 10V
Drivers ................................................. –25V to 25V
Receivers ............................... –0.3V to (VCC + 0.3V)
Output Short-Circuit Duration......................... Indefinite
Operating Temperature Range
V
EE ................................................................... –10V
Input Voltage
Drivers ................................... –0.3V to (VCC + 0.3V)
Receivers ............................................. –25V to 25V
ON/OFF, LB, SEL1,
LTC1321C/LTC1322C/LTC1335C ......... 0°C to 70°C
LTC1321I/LTC1322I/LTC1335I......... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
SEL2, OE ............................ –0.3V to (VCC + 0.3V)
W
U
/O
PACKAGE RDER I FOR ATIO
2 RS485 DRIVERS/RECEIVERS
4 EIA/TIA-562 DRIVERS/RECEIVERS
2 RS485 DRIVERS/RECEIVERS
4 EIA/TIA-562 DRIVERS/RECEIVERS
2 RS485 DRIVERS/RECEIVERS
2 EIA/TIA-562 DRIVERS/RECEIVERS
TOP VIEW
TOP VIEW
TOP VIEW
OE
B1
1
2
V
CC
24
23
22
21
20
19
18
17
16
15
14
13
V
V
1
2
V
CC
1
2
V
24
23
22
21
20
24
23
22
21
20
19
18
17
16
15
14
13
DD
B1
DD
B1
CC
R
R
D
D
R
R
D
D
NC
R
B1
A1
B1
A1
A1
3
A1
Z1
Y1
A1
Z1
Y1
3
3
A1
Z1
4
/DE1
4
/DE1
Z1
4
DE1
Z1
Y1
5
5
5
D
Y1
Y1
Y1
SEL1
SEL2
Y2
6
LB
SEL1
SEL2
Y2
SEL1
SEL2
Y2
6
19 LB
6
LB
7
ON/OFF
7
7
ON/OFF
18 ON/OFF
8
D
Y2
8
D
D
R
R
V
8
D
17
16
15
14
13
Y2
Z2
A2
B2
Y2
Z2
9
D
R
R
V
/DE2
Z2
Z2
9
/DE2
9
DE2
Z2
A2
B2
A2
10
11
12
A2
A2
10
11
12
10
11
12
R
A2
B2
B2
B2
NC
GND
GND
GND
V
EE
EE
EE
N PACKAGE
24-LEAD PLASTIC DIP
N PACKAGE
24-LEAD PLASTIC DIP
S PACKAGE
24-LEAD PLASTIC SOL
S PACKAGE
24-LEAD PLASTIC SOL
N PACKAGE
S PACKAGE
24-LEAD PLASTIC DIP 24-LEAD PLASTIC SOL
T
JMAX = 125°C, θJA = 75°C/W (N)
TJMAX = 125°C, θJA = 75°C/W (N)
TJMAX = 125°C, θJA = 85°C/W (S)
TJMAX = 125°C, θJA = 75°C/W (N)
TJMAX = 125°C, θJA = 85°C/W (S)
TJMAX = 125°C, θJA = 85°C/W (S)
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
LTC1322CN
LTC1322CS
LTC1322IN
LTC1322IS
LTC1321CN
LTC1321CS
LTC1321IN
LTC1321IS
LTC1335CN
LTC1335CS
LTC1335IN
LTC1335IS
Consult factory for Military grade parts.
2
LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = –5V ±5% (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RS485 Driver (SEL1 = SEL2 = HIGH)
V
OD1
V
OD2
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (With Load)
I = 0
●
5
V
O
Figure 1, R = 50Ω (RS422)
Figure 1, R = 27Ω (RS485)
●
●
2.0
1.5
5
5
V
V
∆V
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output States
Figure 1, R = 27Ω or R = 50Ω
●
0.2
V
OD
V
Driver Common-Mode Output Voltage
Figure 1, R = 27Ω or R = 50Ω
Figure 1, R = 27Ω or R = 50Ω
●
●
3
V
V
OC
∆ V
Change in Magnitude of Driver Common-Mode
Output Voltage for Complementary Output States
0.2
OC
I
Driver Short-Circuit Current
–7V ≤ V ≤ 12V, V = HIGH
●
●
35
10
250
250
mA
mA
OSD
O
O
–7V ≤ V ≤ 12V, V = LOW (Note 4)
O
O
I
Three-State Output Current (Y, Z)
–7V ≤ V ≤ 12V
●
±5
±500
µA
OZD
O
EIA/TIA-562 Driver (SEL1 = SEL2 = LOW)
V
O
Output Voltage Swing
Figure 4, R = 3k, Positve
●
●
3.7
–3.7
4.2
–4.3
V
V
L
Figure 4, R = 3k, Negative
L
I
Output Short-Circuit Current
V = 0V
O
●
±11
±60
mA
OSD
Driver Inputs and Control Inputs
V
Input High Voltage
Input Low Voltage
Input Current
D, DE, ON/OFF, SEL1, SEL2, LB
OE (LTC1335)
●
●
2
2
V
V
IH
V
IL
D, DE, ON/OFF, SEL1, SEL2, LB
OE (LTC1335)
●
●
0.8
0.8
V
V
I
D, SEL1, SEL2
DE, ON/OFF, LB
OE (LTC1335)
●
●
●
±10
–15
15
µA
µA
µA
IN
–4
4
RS485 Receiver (SEL1 = SEL2 = HIGH)
V
TH
Differential Input Threshold Voltage
–7V ≤ V ≤ 7V, Commercial
●
●
–0.2
–0.3
0.2
0.3
V
V
CM
–7V ≤ V ≤ 7V, Industrial
CM
∆V
Input Hysteresis
Input Current (A, B)
Input Resistance
V
= 0V
●
●
●
70
24
mV
mA
kΩ
TH
CM
I
–7V ≤ V ≤ 12V
±1
IN
IN
R
IN
–7V ≤ V ≤ 12V
12
IN
EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW)
V
Receiver Input Voltage Threshold
Input Low Threshold
Input High Threshold
●
●
0.8
1.1
1.7
V
V
TH
2.4
1.0
7
∆V
Receiver Input Hysteresis
Receiver Input Resistance
●
0.1
3
0.6
5
V
TH
R
V
IN
= ±10V
kΩ
IN
Receiver Output
V
V
Receiver Output High Voltage
Receiver Output Low Voltage
Short-Circuit Current
I = –3mA, V = 0V, SEL1 = SEL2 = LOW
●
●
●
3.5
7
4.6
0.2
V
V
OH
OL
O
IN
I = 3mA, V = 3V, SEL1 = SEL2 = LOW
0.4
85
O
IN
I
I
0V ≤ V ≤ V
CC
mA
OSR
OZR
O
Three-State Output Current
ON/OFF = 0V
OE = V (LTC1335)
●
●
±10
±10
µA
µA
CC
3
LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = –5V ±5% (Notes 2, 3)
SYMBOL PARAMETER
Supply Currents
CONDITIONS
MIN
TYP
MAX
UNITS
I
I
I
V
CC
V
DD
V
EE
Supply Current
No Load (SEL1 = SEL2 = HIGH)
Shutdown, ON/OFF = 0V
●
●
1000
15
2000
50
µA
µA
CC
DD
EE
Supply Current (LTC1321/LTC1322)
Supply Current
No Load (SEL1 = SEL2 = LOW)
Shutdown, ON/OFF = 0V
●
●
300
0.1
1000
50
µA
µA
No Load (SEL1 = SEL2 = HIGH)
Shutdown, ON/OFF = 0V
●
●
–1000
–0.1
–2000
–50
µA
µA
AC
ELECTRICAL CHARACTERISTICS
VCC = VDD (LTC1321/LTC1322) = 5V ±5%, VEE = –5V ±5% (Notes 2, 3)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
EIA/TIA-562 Mode (SEL1 = SEL2 = LOW)
SR
Slew Rate
Figure 4, R = 3k, C = 15pF
●
●
14
7
30
V/µs
V/µs
L
L
Figure 4, R = 3k, C = 1000pF
4
L
L
t
t
t
t
t
Transition Time
Figure 4, R = 3k, C = 2500pF
●
●
●
●
●
0.22
1.9
0.6
0.6
0.3
0.4
3.1
4
µs
µs
µs
µs
µs
T
L
L
Driver Input to Output
Driver Input to Output
Receiver Input to Output
Receiver Input to Output
Figures 4,10, R = 3k, C = 15pF
L L
PLH
PHL
PLH
PHL
Figures 4,10, R = 3k, C = 15pF
4
L
L
Figures 5,11
Figures 5,11
6
6
RS485 Mode (SEL1 = SEL2 = HIGH)
t
t
t
Driver Input to Output
Figures 2,7, R = 54Ω, C = 100pF
●
●
●
●
●
●
●
●
●
●
●
20
20
40
40
5
70
70
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
PLH
L
L
Driver Input to Output
Figures 2,7, R = 54Ω, C = 100pF
L L
PHL
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Low
Driver Disable from High
Receiver Input to Output
Receiver Input to Output
Differential Receiver Skew,
Figures 2,7, R = 54Ω, C = 100pF
15
SKEW
L
L
t , t
Figures 2,7, R = 54Ω, C = 100pF
3
15
50
50
50
60
60
70
10
40
r
f
L
L
t
t
t
t
t
t
Figures 3,8, C = 100pF, S1 Closed
90
ZL
ZH
LZ
HZ
L
Figures 3,8, C = 100pF, S2 Closed
90
L
Figures 3,8, C = 15pF, S1 Closed
90
L
Figures 3,8, C = 15pF, S2 Closed
90
L
Figures 2,9, R = 54Ω, C = 100pF
20
20
140
140
PLH
PHL
L
L
Figures 2,9, R = 54Ω, C = 100pF
L
L
t
t
-t
Figures 2,9, R = 54Ω, C = 100pF
L L
SKEW
PLH PHL
Receiver Output Enable/Disable (LTC1335)
t
t
Receiver Enable to Output Low
Receiver Enable to Output High
Figures 6,12, C = 15pF, S1 Closed
●
●
40
40
90
90
ns
ns
ZL
L
Figures 6,12, C = 15pF, S2 Closed
ZH
L
t
t
Receiver Disable from Low
Receiver Disable from High
Figures 6,12, C = 15pF, S1 Closed
●
●
40
50
90
90
ns
ns
LZ
L
Figures 6,12, C = 15pF, S2 Closed
HZ
L
The
●
denotes specifications which apply over the full operating
Note 3: All typicals are given at V = V (LTC1321/LTC1322) = 5V,
DD
CC
EE A
temperature range.
V
= –5V, and T = 25°C.
Note 1: Absolute maximum ratings are those values beyond which the
safety of the device cannot be guaranteed.
Note 4: Short-circuit current for RS485 driver output low state folds back
above V . Peak current occurs around V = 3V.
CC
O
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
4
LTC1321/LTC1322/LTC1335
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
RS485 Driver Differential Output
Voltage vs Temperature
RS485 Driver Differential Output
Current vs Output Voltage
RS485 Driver Skew vs
Temperature
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
15
12
9
70
60
50
40
30
20
10
0
T
A
= 25°C
R
= 54Ω
L
6
3
0
–50
0
25
50
75 100 125
1
2
5
–50
–25
0
25
50
75 100 125
–25
0
3
4
TEMPERATURE (°C)
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
1321 G01
1321 G03
1321 G02
RS485 Driver Output Low Voltage
vs Output Current
RS485 Driver Output Short-Circuit
Current vs Temperature
RS485 Driver Output High Voltage
vs Output Current
120
100
80
60
40
20
0
160
140
120
100
80
–80
–70
–60
–50
–40
–30
–20
–10
0
T
A
= 25°C
T
= 25°C
A
SINK
OUT
(V
= 5V)
SOURCE
OUT
(V
= 0V)
60
40
1
2
4
0
1
2
3
4
5
–50
25
50
75
100 125
0
5
–25
0
3
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
1321 G05
1321 G04
1321 G19
EIA562 Driver Output Voltage
vs Supply Voltage
EIA562 Driver Output Voltage
vs Temperature
EIA562 Driver Output Short-Circuit
Current vs Temperature
5
4
18
16
14
12
10
8
10
8
V
OUT
= 0V
R
= 3k
L
OUTPUT HIGH
T
= 25°C
A
3
V
= –V
EE
DD
6
OUTPUT HIGH
2
4
1
2
R
= 3k
L
SOURCE
0
0
–1
–2
–3
–4
–5
–2
–4
–6
–8
–10
SINK
OUTPUT LOW
OUTPUT LOW
6
–50
0
25
50
75 100 125
–25
–50
25
50
75
100 125
–25
0
4
5
7
8
9
10
6
TEMPERATURE (°C)
TEMPERATURE (°C)
V
SUPPLY VOLTAGE (V)
DD
1321 G07
1321 G09
1321 G08
5
LTC1321/LTC1322/LTC1335
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Receiver Output Low Voltage
vs Temperature
Receiver Output High Voltage
vs Temperature
RS485 Receiver tPLH – tPHL
vs Temperature
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
0.5
0.4
0.3
0.2
0.1
0
20
18
16
14
12
10
8
I
= 3mA
I
= 3mA
OUT
OUT
6
4
2
0
–50
0
25
50
75 100 125
–50
0
25
50
75 100 125
–50
–25
0
25
50
75 100 125
–25
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1321 G10
1321 G11
1321 G12
Receiver Output Current
vs Output High Voltage
Receiver Output Current
vs Output Low Voltage
EIA562 Receiver Input Threshold
Voltage vs Temperature
2.0
1.8
1.6
1.4
1.2
1.0
0.8
40
35
30
25
20
15
10
5
120
18
16
14
12
10
8
T
= 25°C
T
= 25°C
A
A
INPUT HIGH
INPUT LOW
6
4
2
0
0
2.5
50
TEMPERATURE (°C)
100 125
0
0.5
1.0
1.5
2.0
3.0
–50 –25
0
25
75
2.0
2.5
3.5
4.0
4.5
5.0
3.0
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1321 G14
1321 G15
1321 G13
Supply Current in EIA562 Mode
vs Temperature (Both Ports)
Driver Output Leakage Current
(Disable/Shutdown) vs Temperature
Supply Current in RS485 Mode
vs Temperature (Both Ports)
500
450
400
350
300
250
200
150
100
50
±400
±350
±300
±250
±200
±150
±100
±50
1.2
1.0
0.8
0.6
0.4
0.2
0
R
L
=
∞
R = ∞
L
I
CC
–I
EE
–I
EE
–I
DD
CC
I
–I
DD
0
0
–50
0
25
50
75 100 125
–25
–25
0
25
50
75
125
50
TEMPERATURE (°C)
100 125
–50
100
–50 –25
0
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
1321 G18
1321 G06
1321 G17
6
LTC1321/LTC1322/LTC1335
U
U
U
PI FU CTIO S
LTC1322/LTC1335
LTC1321
VDD(Pin1):PositiveSupplyInputforEIA/TIA-562Drivers.
B1: (Pin 2): Receiver Input.
OE/VDD (Pin 1): For LTC1335, pin 1 is the receiver
outputenablewithinternalpull-down.ForLTC1322,pin
1 is the positive supply input for EIA/TIA-562 drivers.
A1 (Pin 3): Receiver Input.
B1: (Pin 2): Receiver Input.
A1 (Pin 3): Receiver Input.
Z1 (Pin 4): Driver Output.
Z1 (Pin 4): Driver Output.
Y1 (Pin 5): Driver Output.
SEL1 (Pin 6): Interface Mode Select Input.
SEL2 (Pin 7): Interface Mode Select Input.
Y2 (Pin 8): Driver Output.
Y1 (Pin 5): Driver Output.
SEL1 (Pin 6): Interface Mode Select Input.
SEL2 (Pin 7): Interface Mode Select Input.
Y2 (Pin 8): Driver Output.
Z2 (Pin 9): Driver Output.
A2 (Pin 10): Receiver Input.
Z2 (Pin 9): Driver Output.
B2 (Pin 11): Receiver Input.
A2 (Pin 10): Receiver Input.
B2 (Pin 11): Receiver Input.
GND (Pin 12): Ground.
GND (Pin 12): Ground.
VEE (Pin 13): Negative Supply.
NC (Pin 14): No Connection.
RA2 (Pin 15): Receiver Output.
V
EE (Pin 13): Negative Supply.
RB2 (Pin 14): Receiver Output.
RA2 (Pin 15): Receiver Output.
DE2(Pin16):DriverEnablewithInternalPull-UpinRS485
Mode.
DZ2/DE2 (Pin 16): EIA/TIA-562 Driver Input in EIA562
Mode. RS485 Driver Enable with Internal Pull-Up in
RS485 Mode.
DY2 (Pin 17): Driver Input.
ON/OFF (Pin 18): A HIGH logic input enables the trans-
ceivers. A LOW puts the device into shutdown mode and
reduces ICC to 15µA. This pin has an internal pull-up.
DY2 (Pin 17): Driver Input.
ON/OFF (Pin 18): A HIGH logic input enables the
transceivers. A LOW puts the device into shutdown
mode and reduces ICC to 15µA. This pin has an internal
pull-up.
LB (Pin 19): Loopback Control Input. A LOW logic level
enables loopback connections. This pin has an internal
pull-up.
DY1 (Pin 20): Driver Input.
LB (Pin 19): Loopback Control Input. A LOW logic level
enables loopback connections. This pin has an internal
pull-up.
DE1(Pin21):DriverEnablewithInternalPull-UpinRS485
Mode.
RA1 (Pin 22): Receiver Output.
D
Y1 (Pin 20): Driver Input.
NC (Pin 23): No Connection.
DZ1/DE1 (Pin 21): EIA/TIA-562 Driver Input in EIA562
Mode. RS485 Driver Enable with Internal Pull-up in
RS485 Mode.
VCC (Pin 24): Positive Supply; 4.75V ≤ VCC ≤ 5.25V.
RA1 (Pin 22): Receiver Output.
RB1 (Pin 23): Receiver Output.
VCC (Pin 24): Positive Supply; 4.75V ≤ VCC ≤ 5.25V.
7
LTC1321/LTC1322/LTC1335
U
U
FU CTIO TABLES
LTC1321
LTC1322
RS485 Driver Mode
RS485 Driver Mode
INPUTS
LINE
OUTPUTS
INPUTS
LINE
OUTPUTS
ON/OFF
SEL
1
DE
1
D
0
1
X
X
X
CONDITION
Y
Z
1
0
Z
Z
Z
ON/OFF
SEL
1
DE
1
D
0
1
X
X
X
CONDITION
Y
Z
1
0
Z
Z
Z
1
1
1
1
0
No Fault
No Fault
Fault
X
0
1
Z
Z
Z
1
1
1
1
0
No Fault
No Fault
Fault
X
0
1
Z
Z
Z
1
1
1
1
1
1
1
1
1
0
1
0
1
X
X
1
X
X
RS485 Receiver Mode
INPUTS
RS485 Receiver Mode
INPUTS
OUTPUT
R
OUTPUT
R
ON/OFF
SEL
A – B
< –0.2V
> 0.2V
ON/OFF
SEL
A – B
< –0.2V
> 0.2V
1
1
1
0
1
0
1
1
Z
1
1
1
0
1
0
1
1
Z
1
1
1
Inputs Open
X
1
Inputs Open
X
1
1
RS232/EIA562 Driver Mode
INPUTS
RS232/EIA562 Driver Mode
INPUTS
LINE
CONDITION
OUTPUT
Y, Z
LINE
CONDITION
OUTPUT
Y
ON/OFF
SEL
0
D
ON/OFF
SEL
D
1
1
1
0
0
1
X
X
No Fault
No Fault
Fault
1
0
Z
Z
1
1
1
0
0
0
1
X
X
No Fault
No Fault
Fault
1
0
Z
Z
0
0
0
0
0
X
0
X
RS232/EIA562 Receiver Mode
INPUTS
RS232/EIA562 Receiver Mode
INPUTS
OUTPUT
R
OUTPUT
R
ON/OFF
SEL
A
ON/OFF
SEL
A OR B
1
1
1
0
0
0
1
0
1
Z
1
1
1
0
0
0
1
0
1
Z
0
1
Inputs Open
X
0
1
Input Open
X
0
0
0
0
8
LTC1321/LTC1322/LTC1335
U
U
FU CTIO TABLES
LTC1335
EIA562 Driver Mode
INPUTS
SEL
RS485 Driver Mode
LINE
CONDITION
OUTPUT
Y, Z
INPUTS
LINE
CONDITION
OUTPUTS
ON/OFF
SEL
1
DE
1
D
0
1
X
X
X
Y
Z
1
0
Z
Z
Z
ON/OFF
D
0
1
X
X
1
1
1
0
0
0
0
0
No Fault
No Fault
Fault
1
0
Z
Z
1
1
1
1
0
No Fault
No Fault
Fault
X
0
1
Z
Z
Z
1
1
1
1
1
0
X
1
X
X
RS485 Receiver Mode
INPUTS
EIA562 Receiver Mode
INPUTS
OE
OUTPUT
R
OUTPUT
R
ON/OFF
SEL
1
OE
0
A – B
< –0.2V
> 0.2V
Inputs Open
X
ON/OFF
SEL
0
A OR B
1
1
1
1
0
0
1
1
Z
Z
1
1
1
1
0
0
0
0
1
X
0
1
0
1
Z
Z
1
0
0
1
1
0
0
Input Open
1
1
0
X
X
1
X
X
0
W
BLOCK DIAGRA SM
LTC1321 Interface Configuration Without Loopback
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
PORT 1 = RS485 MODE
PORT 2 = EIA562 MODE
PORT 1 = EIA562 MODE
PORT 2 = RS485 MODE
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
1
1
1
24
22
24
24
24
1
2
3
V
V
V
V
V
V
V
V
DD
B1
A1
Z1
Y1
CC
DD
CC
DD
CC
DD
A1
CC
3
2
3
3
22
22
A1
R
B1
A1
R
22
A1
A1
R
A1
R
A1
20
19
20
5
6
5
6
21
20
4
5
21
20
4
5
D
Y1
D
Y1
DE1
Y1
Y1
DE1
Z1
Y1
D
SEL1
Y1
19
18
D
Y1
SEL1
LB
LB
6
7
19
18
17
6
7
*SEL1
*SEL2
LB
19
*SEL1
SEL2
7
LB
ON
*SEL2
7
8
18
17
ON
7
1
ON
D
SEL2
Y2
D
Y2
8
9
8
9
Y2
Z2
18
17
Y2
Z2
D
Y2
ON
8
16
Y2
D
DE2
Y2
Y2
16
15
10
DE2
10
A2
A2
B2
15
13
15
13
15
13
10
12
10
12
R
R
A2
11
12
11
12
A2
A2
A2
R
V
R
B2
A2
A2
13
V
GND
GND
V
EE
V
GND
GND
EE
EE
EE
1321BD01
* SEL1/SEL2 = V
CC
9
LTC1321/LTC1322/LTC1335
W
BLOCK DIAGRA SM
LTC1321 Interface Configuration With Loopback
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
PORT 1 = RS485 MODE
PORT 2 = EIA562 MODE
PORT 1 = EIA562 MODE
PORT 2 = RS485 MODE
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
1
1
1
24
24
24
1
24
V
V
V
V
V
V
CC
V
V
CC
DD
CC
DD
CC
DD
Y1
DD
22
20
19
22
20
19
22
R
R
A1
22
R
A1
4
A1
R
A1
Z1
4
Z1
5
5
6
21
21
20
D
Y1
DE1
Y1
D
Y1
DE1
20
5
6
D
Y1
5
6
7
6
Y1
D
Y1
SEL1
Y1
SEL1
LB
LB
19
*SEL1
19
*SEL1
SEL2
LB
18
17
LB
7
8
ON
7
8
7
8
18
17
*SEL2
Y2
18
17
ON
D
*SEL2
Y2
SEL2
Y2
D
Y2
ON
D
18
17
ON
D
Y2
8
16
Y2
DE2
Y2
Y2
16
9
DE2
Z2
9
15
13
Z2
15
13
15
13
R
A2
15
13
R
R
V
R
V
A2
A2
A2
12
12
12
12
V
V
GND
GND
GND
GND
EE
EE
EE
EE
1321 BD02
*SEL1/SEL2 = V
CC
LTC1322/LTC1335 Interface Configuration Without Loopback
PORT 1 = RS485 MODE
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
PORT 2 = RS485 MODE
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
24
24
24
1
1
2
24
1
1
*
*
*
*
V
V
V
CC
V
*V /OE
DD
*V /OE
DD
*V /OE
DD
*V /OE
DD
CC
CC
CC
2
23
23
B1
B1
R
R
B1
B1
2
3
4
23
2
3
4
23
B1
A1
Z1
B1
A1
Z1
R
R
D
D
R
R
D
D
B1
A1
Z1
Y1
B1
A1
Z1
Y1
22
22
R
R
3
A1
3
4
22
21
20
22
21
20
A1
A1
A1
Z1
21
20
21
20
DE1
DE1
4
5
6
5
6
5
6
Z1
Y1
**SEL1
5
6
D
Y1
Y1
SEL1
Y1
SEL1
D
Y1
Y1
19
19
19
19
**SEL1
LB
LB
LB
LB
7
7
7
SEL2
SEL2
7
8
**SEL2
**SEL2
Y2
18
17
18
17
18
17
18
17
ON
D
ON
D
ON
D
ON
8
9
8
9
8
9
Y2
Z2
Y2
Z2
D
Y2
Y2
Y2
Y2
Z2
Y2
9
Z2
16
15
16
15
16
15
16
15
D
D
Z2
A2
Z2
DE2
DE2
10
11
10
11
10
10
A2
B2
A2
B2
A2
A2
R
R
A2
R
R
A2
A2
14
13
14
13
14
13
11
12
11
12
14
13
B2
GND
R
B2
V
EE
B2
GND
R
R
R
B2
B2
B2
EE
12
12
V
V
V
GND
GND
EE
EE
1322/35 BD01
*
FOR LTC1322 ONLY, PIN 1 IS V , AND OE IS ALWAYS ENABLED.
DD
FOR LTC1335, PIN 1 IS OE, AND V IS CONNECTED TO V
DD
.
CC
**
SEL1/SEL2 = V
CC
.
10
LTC1321/LTC1322/LTC1335
W
BLOCK DIAGRA SM
LTC1322/LTC1335 Interface Configuration With Loopback
PORT 1 = RS485 MODE
PORT 2 = EIA562 MODE
PORT 1 = RS485 MODE
PORT 2 = RS485 MODE
PORT 1 = EIA562 MODE
PORT 2 = EIA562 MODE
PORT 1 = EIA562 MODE
PORT 2 = RS485 MODE
24
24
24
1
1
24
1
1
*
*
*
*
V
CC
V
CC
V
CC
V
R
*V /OE
DD
*V /OE
DD
*V /OE
DD
*V /OE
DD
CC
23
23
R
B1
B1
23
23
R
R
D
D
R
R
D
D
B1
A1
Z1
Y1
B1
A1
Z1
Y1
22
22
R
A1
4
R
A1
4
22
21
20
22
21
20
Z1
Z1
21
20
4
4
21
20
DE1
DE1
Z1
Z1
5
6
5
6
5
6
D
Y1
SEL1
Y1
SEL1
5
6
D
Y1
Y1
Y1
Y1
**SEL1
19
19
19
19
**SEL1
LB
LB
LB
LB
7
7
SEL2
SEL2
7
8
7
8
**SEL2
Y2
**SEL2
Y2
18
17
18
17
18
17
18
17
ON
D
ON
D
ON
ON
8
9
8
9
D
Y2
Y2
Z2
D
Y2
Y2
Y2
Z2
Y2
16
15
16
15
16
15
16
15
D
D
Z2
A2
Z2
A2
DE2
DE2
9
9
Z2
Z2
R
R
R
A2
R
A2
14
13
14
13
14
13
14
13
R
B2
V
EE
R
B2
V
EE
R
B2
V
EE
R
B2
EE
12
12
12
12
V
GND
GND
GND
GND
1322/35 BD02
*
FOR LTC1322 ONLY, PIN 1 IS V , AND OE IS ALWAYS ENABLED.
DD
FOR LTC1335, PIN 1 IS OE, AND V IS CONNECTED TO V
DD CC
.
**
SEL1/SEL2 = V
.
CC
TEST CIRCUITS
V
CC
Y
3V
SEL
3V
S1
R
C
C
L
L
SEL
DE
3V
Y
Z
500Ω
A
B
R
D
DR OUT
V
OD
R
L
OE
15pF
C
L
S2
V
OC
R
0V
Z
1321/22/35 F03
1321/22/35 F02
1321/22/35 F01
Figure 1. RS485 Driver
Test Load
Figure 2. RS485 Driver/Receiver
Timing Test Circuit
Figure 3. RS485 Driver Output
Enable/Disable Timing Test Load
V
CC
0V
0V
SEL
0V
SEL
SEL
S1
Y OR Z
D
1k
Y OR Z
A OR B
R
D
RX OUT
R
L
OE
C
L
15pF
C
S2
L
0V
1321/22/35 F05
1321/22/35 F04
1321/22/35 F06
Figure 6. Receiver Output
Enable/Disable Timing Test Load
Figure 4. EIA/TIA-562 Driver
Timing Test Circuit
Figure 5. EIA/TIA-562 Receiver
Timing Test Circuit
11
LTC1321/LTC1322/LTC1335
U
W
SWITCHI G WAVEFOR S
3V
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
1.5V
1.5V
D
0V
t
t
PHL
PLH
V
O
O
90%
90%
V
DIFF
= V(Y) – V(Z)
Y – Z
–V
50%
10%
50%
10%
1/2 V
O
t
r
t
f
Z
V
O
Y
t
t
SKEW
1321/22/35 F07
SKEW
Figure 7. RS485 Driver Propagation Delays
3V
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
1.5V
1.5V
DE
0V
5V
t
ZL
t
LZ
Y OR Z
2.3V
2.3V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0.5V
0.5V
V
OL
OH
0V
t
ZH
t
HZ
V
Y OR Z
1321/22/35 F08
Figure 8. RS485 Driver Enable and Disable Times
V
OD2
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
INPUT
0V
t
A – B
–V
0V
OD2
t
PLH
PHL
OUTPUT
V
OH
R
1.5V
1.5V
V
OL
1321/22/35 F09
Figure 9. RS485 Receiver Propagation Delays
3V
1.5V
1.5V
D
0V
t
t
PLH
PHL
V
O
O
1321/22/35 F10
Y OR Z
–V
0V
0V
Figure 10. EIA/TIA-562 Driver Propagation Delays
12
LTC1321/LTC1322/LTC1335
U
W
SWITCHI G WAVEFOR S
V
IH
1.7V
1.3V
A OR B
V
IL
t
t
PLH
PHL
V
OH
2.4V
1321/22/35 F11
R
0.8V
V
OL
Figure 11. EIA/TIA-562 Receiver Propagation Delays
3V
1.5V
1.5V
OE
f = 1MHz: t ≤ 10ns: t ≤ 10ns
r
f
0V
5V
t
t
LZ
ZL
R
1.5V
1.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0.5V
0.5V
V
OL
OH
0V
t
t
ZH
HZ
V
R
1321/22/35 F12
Figure 12. Receiver Enable and Disable Times
O U
W
U
PPLICATI
A
S I FOR ATIO
In RS485 mode, shutdown mode or with the power off,
the input resistance of the receiver is 24k. The input
resistance drops to 6.3k in EIA562 mode.
Basic Theory of Operation
The LTC1321/LTC1322/LTC1335 each have two interface
ports.Eachportmaybeconfiguredassingle-endedEIA562
transceiver(s) or differential RS485 transceiver by forcing
the port’s selection input to a LOW or HIGH, respectively.
The LTC1321 provides one EIA562 driver and one EIA562
receiver per port to maintain same pinout as SP301. The
LTC1322 and LTC1335 each provide two drivers and two
receiversperport.Additionally,theLTC1321andLTC1322
single-ended ports are RS232 compatible with higher VDD
and VEE supply levels.
A logic LOW at the ON/OFF pin shuts down the device
and forces all the outputs into a high impedance state.
AlogicHIGHenablesthedevice.Aninternal4µAcurrent
source to VCC pulls the ON/OFF pin HIGH if left open.
In RS485 mode, an internal 4µA current source pulls
the driver enable pin HIGH if left open. The RS485
receiver has a 4µA current source at the noninverting
input. If both the RS485 receiver inputs are open, the
output is a high state. Both the current sources are
disabled in the EIA562 mode.
All the interface drivers feature three-state outputs. Inter-
faceoutputsareforcedintohighimpedancewhenthedriver
is disabled, in the shutdown mode, or with the power off.
For LTC1335, a logic LOW at the OE pin enables all the
receiver outputs and a logic HIGH disables all the
receiver outputs. An internal 4µA current source pulls
the OE pin LOW if left open.
All the interface driver outputs are fault protected by a
currentlimitingandthermalshutdowncircuit.Thethermal
shutdown circuit disables both the EIA562 and RS485
driver outputs when the die temperature reaches 150°C.
Thethermalshutdowncircuitenablesthedriverswhenthe
die temperature cools to 135°C.
A loopback mode enables internal connections from
driver outputs to receiver inputs for self-test when the
13
LTC1321/LTC1322/LTC1335
O U
W
U
PPLICATI
S I FOR ATIO
A
LTC1321/LTC1322 ONLY
(LTC1321/LTC1322)
LB pin has a LOW logic state. The driver outputs are not
isolated from the external loads. This allows transmitter
verification under the loaded condition. An internal 4µA
current source pulls the LB pin HIGH if left open and
disables the loopback configuration.
V
24
22
21
1
2
3
V
CC
5V
DD
OR OE (LTC1335)
0.1µF
RX OUT
DR ENABLE
DR IN
120Ω
RS485 I/O
4
5
20
19
18
17
16
15
14
13
6
LTC1321
LTC1322
LTC1335
5V
0V
5V
5V
7
EIA562/RS485 Applications
8
EIA562 DR OUT
DR IN
DR IN
RX OUT
RX OUT
EIA562 and RS485 output levels are supported when
LTC1321/LTC1322/LTC1335 are powered from ±5V sup-
plies. TheLTC1321/LTC1322requiretheVDD andVCC pins
tobetiedtogetherandconnectedto5Vsupply(Figure13).
The VDD and VCC are connected internally and brought out
at VCC pin in the LTC1335. The unloaded outputs will
swing from –5V to 5V in EIA562 mode, and from 0V to 5V
in RS485 mode.
9
EIA562 DR OUT (LTC1322/LTC1335 ONLY)
EIA562 RX IN
10
11
12
EIA562 RX IN (LTC1322/LTC1335 ONLY)
V
–5V
EE
0.1µF
1321/22/35 F13
Figure 13. EIA562/RS485 Interfaces with ±5V Supplies
RS232/RS485 Applications
+
V
If true RS232-compatible outputs are required, the
LTC1321/LTC1322 may be used with the VDD and VEE
supply voltages increased to provide the additional signal
swing. To meet RS232, VDD must be between 6.5V and
10V, and VEE must be between –6.5V and –10V. VCC
remains connected to 5V. If only ±12V supplies are avail-
able, inexpensive Zener diodes (Z1 and Z2) may be con-
nected in series with VDD and VEE supply pins as shown in
Figure 14. An optional 16V Zener diode between VCC and
VEE is recommended to keep the maximum voltage be-
tween VCC and VEE within safe limits.
12V
Z1
1N5229B
4.3V
V
DD
V
1
2
3
24
22
21
CC
5V
0.1µF
RX OUT
0.1µF
DR ENABLE
120Ω
RS485 I/O
4
5
20
DR IN
5V
Z3*
19
18
17
16
15
14
13
6
7
5V
0V
RS232 DR OUT
LTC1321
LTC1322
1N5246B
16V
5V
DR IN
DR IN
8
9
RS232 DR OUT (LTC1322 ONLY)
RS232 RX IN
10
RX OUT
RX OUT
11
12
RS232 RX IN (LTC1322 ONLY)
LocalTalk®/AppleTalk® Applications
V
EE
Z2
0.1µF
1N5229B
4.3V
The LTC1321/LTC1322/LTC1335 can be used to provide
AppleTalk/LocalTalk-compatible signals in RS485 mode.
Figure 15 shows one half of an LTC1335 connected to an
LTC1320 AppleTalk transceiver in a typical LocalTalk
configuration. Figure 16 shows a typical direct-wire con-
nection with the LTC1335 as the DCE transceiver and the
LTC1320 as the DTE transceiver. The LTC1321/LTC1322/
LTC1335 RS485 mode is capable of meeting all AppleTalk
protocol specifications.
1321/22/35 F14
–
V
*OPTIONAL
–12V
Figure 14. RS232/RS485 Interfaces with 5V, ±12V Supplies
LocalTalkand AppleTalkare registered trademarks of Apple Computer, Inc.
14
LTC1321/LTC1322/LTC1335
O U
S
W
U
PPLICATI
A
I FOR ATIO
24
23
22
1
2
5V
OE
1k
1k
RFI
R
A1
3
4
1
18
5V
–
RFI
RFI
TXD
2
21
20
17 TXD
TXI
DE1
RFI
RFI
120Ω
120Ω
+
16
15
14
13
12
11
10
TXD
5V
3
5
D
Y1
RFI
TXDEN
4
5
6
7
8
9
6
7
19
18
5V
5V
SEL1, 5V
SEL2, 5V
1k
1k
RXEN
RXO
RXO
LTC1335
22Ω
22Ω
100pF
=
RFI
8
–
+
17
RXD
RXD
RFI
RFI
RXDO
9
16
15
14
13
LTC1320
10
11
12
–5V
1321/22/35 F15
Figure 15. Apple LocalTalk Implemented Using
LTC1320 and LTC1335 Transceivers
1
18
TXD
TXI
5V
24
5V
1
–
+
OE
2
17 TXD
RFI
23
2
RFI
120Ω
120Ω
3
3
4
22
16
TXD
TXO
TXDEN
R
RFI
RFI
RFI
RFI
A1
4
5
6
7
21
15
14
13
12
11
DE1
–5V
RXI
120Ω
RXEN
RXO
20
5
D
RFI
RFI
RFI
Y1
RFI
RXI
RXO
19
18
6
7
–
+
5V
5V
RXD
SEL1, 5V
SEL2
8
RXDO
LTC1335
120Ω
LTC1320
9
10 RXD
8
17
16
RFI
RFI
D
D
Y2
Z2
9
RFI
RFI
22Ω
22Ω
100pF
10
=
RFI
15
14
13
R
A2
11
12
–5V
1321/22/35 F16
Figure 16. AppleTalk Direct Connect Using LTC1320
for DTE and LTC1335 for DCE Transceivers
15
LTC1321/LTC1322/LTC1335
U
O
TYPICAL APPLICATI S
A typical EIA562/RS232 interface application is shown in
Figure 17 with LTC1322. A typical EIA562 interface appli-
cation with LTC1335 is shown in Figure 18.
and receivers for half duplex multi-point data transmis-
sion. The wires must be terminated at both ends with
resistors equal to the wire’s characteristic impedance,
generally 120Ω. An optional shield around the twisted pair
helps to reduce unwanted noise and should be connected
to ground at one end.
A typical connection for RS485 transceiver is shown in
Figure19. Atwistedpairofwiresconnectsupto32drivers
1/2 LTC1335
1/2 LTC1335
1/2 LTC1322
1/2 LTC1322
17
16
15
14
7
EIA562
INTERFACE
LINES
3
8
22
23
20
21
6
17
16
15
14
7
EIA562/
RS232
3
8
22
23
20
21
6
DR IN
DR IN
RX OUT
RX OUT
OV
RX OUT
RX OUT
DR IN
DR IN
DR IN
RX OUT
RX OUT
OV
RX OUT
RX OUT
DR IN
2
5
4
9
2
5
4
9
10
11
INTERFACE
LINES
10
11
DR IN
DR IN
0V
1321/22/35 F18
0V
1321/22/35 F17
1
1
OE = 0V
OE = 0V
Figure 18. Typical Connection for EIA562 Interface
Figure 17. Typical Connection for EIA562/RS232 Interface
1/2 LTC1322/LTC1335
1/2 LTC1322/LTC1335
11
2
3
15
22
RX OUT
10
RX OUT
DR ENABLE
DR IN
21
20
6
16
120Ω
120Ω
DR ENABLE
DR IN
9
8
4
5
17
7
5
4
3
2
5V
5V
1/2 LTC1322/LTC1335
20 21
22 6
DR IN
RX OUT
5V
1321/22/35 F19
DR ENABLE
Figure 19. Typical Connection for RS485 Interface
16
LTC1321/LTC1322/LTC1335
U
O
TYPICAL APPLICATI S
AtypicalRS422connectionshowninFigure20allowsone
driver and ten receivers on a twisted pair of wires termi-
nated with a 100Ω resistor at one end. The ground shield
is optional.
A typical twisted pair line repeater is shown in Figure 21.
As data transmission rate drops with increased cable
length, repeater can be inserted to improve transmission
rate or to transmit beyond 4000 feet limit.
1/2 LTC1322/LTC1335
RX OUT
22
6
5V
1/2 LTC1322/LTC1335
DR ENABLE
1/2 LTC1322/LTC1335
3
2
21
11
4
20
6
15
100Ω
DR IN
RX OUT
7
5
10
5V
5V
16
17
DR ENABLE
DR IN
2
3
9
8
22
100Ω
RX OUT
1321/22/35 F20
Figure 20. Typical Connection for RS422 Interface
5V
21
22 20
6
2
3
4
5
100Ω
TX OUT
RX IN
1321/22/35 F21
1/2 LTC1322/LTC1335
Figure 21. Typical Cable Repeater for RS422 Interface
17
LTC1321/LTC1322/LTC1335
U
O
TYPICAL APPLICATI S
TheLTC1322/LTC1335canbeusedtotranslateEIA562to
RS422 interface level or vice versa as shown in Figure 22.
OneportisconfiguredasEIA562transceiverandtheother
as RS485 transceiver. The LTC1322 can also support
RS232 to RS422 level translation if VDD is between 6.5V
and 10V, and VEE is between –6.5V and –10V.
Using two LTC1321/LTC1335 as level translators, the
EIA562/RS232interfacedistancecanbeextendedto4000
feet with twisted wires (Figure 23).
5V
15 20 21
6
4
5
10
8
TX OUT
RX IN
EIA562/RS232*
TX OUT
RS422
LTC1322/LTC1335
2
3
100Ω
RX IN
7
17 22
1321/22/35 F22
* RS232 LEVELS ARE SUPPORTED ON LTC1322.
Figure 22. Typical EIA562/RS232 to RS422 Level Translator
5V
17
22
RS422
15 20 21
6
2
3
4
5
8
10
8
100Ω
TX OUT
RX IN
EIA562/RS232*
TX OUT
EIA562/RS232*
LTC1322/LTC1335
LTC1322/LTC1335
4
5
2
3
10
100Ω
RX IN
21 20 15
7
6
7
17 22
1321/22/35 F23
* RS232 LEVELS ARE SUPPORTED ON LTC1322.
5V
Figure 23. Typical Cable Extension for EIA562/RS232 Interface
18
LTC1321/LTC1322/LTC1335
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
N Package
24-Lead Plastic DIP
1.265
(32.131)
24
23
22
21
20
19
18
17
16
15
10
14
11
13
12
0.260 ± 0.010
(6.604 ± 0.254)
3
4
5
6
7
8
9
1
2
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.015
(0.381)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.125
(3.175)
MIN
0.050 – 0.085
(1.27 – 2.159)
0.325
0.018 ± 0.003
(0.457 ± 0.076)
–0.015
+0.635
8.255
0.100 ± 0.010
(2.540 ± 0.254)
N24 0592
(
)
–0.381
S Package
24-Lead Plastic SOL
0.598 – 0.614
(15.190 – 15.600)
(NOTE 2)
24 23 22 21 20 19 18
16 15 14 13
17
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
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.
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR
PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT
EXCEED 0.006 INCH (0.15mm).
2
3
5
7
8
9
10
1
4
6
11 12
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
0.005
(0.127)
RAD MIN
0.010 – 0.029
× 45°
(0.254 – 0.737)
0° – 8° TYP
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
(0.406 – 1.270)
SOL24 0392
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.
19
LTC1321/LTC1322/LTC1335
U.S. Area Sales Offices
SOUTHWEST REGION
Linear Technology Corporation
22141 Ventura Blvd.
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
Phone: (215) 757-8578
FAX: (215) 757-5631
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
Phone: (508) 658-3881
FAX: (508) 658-2701
International Sales Offices
KOREA
FRANCE
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
TAIWAN
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
Phone: 82-2-792-1617
FAX: 82-2-792-1619
Phone: 33-1-41079555
FAX: 33-1-46314613
SINGAPORE
UNITED KINGDOM
GERMANY
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Linear Techonolgy GmbH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 65-293-5322
FAX: 65-292-0398
Phone: 44-276-677676
FAX: 44-276-64851
Phone: 49-89-3197410
FAX: 49-89-3194821
JAPAN
Linear Technology KK
5F YZ Bldg.
4-4-12 Iidabashi, Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
LT/GP 0594 10K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
20
●
●
LINEAR TECHNOLOGY CORPORATION 1994
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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