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LTC1322CN#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1321/LTC1322/LTC1335
RS232/EIA562/RS485
Transceivers
S
F
EA
T
U
RE
The LTC1321/LTC1322/LTC1335 are low power CMOS
bidirectional transceivers, each featuring two
reconfigurable
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/LTC1322 can provide RS232 or EIA562 compat-
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.
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.
The LTC1321/LTC1322 can support RS232 voltage levels
when 6.5V ≤ V
DD
≤ 10V and –6.5V ≥ V
EE
≥ –10V. The
LTC1335 supports receiver output enable but not RS232
levels. A shutdown mode reduces the I
CC
supply current
to 15µA.
D
U
ESCRIPTIO
APPLICATIONS
U
■
Low Power RS485/RS422/EIA562/RS232 Interface
■
Cable Repeater
■
Level Translator
■
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
■
Thermal Shutdown Protection
■
I/O Lines Can Withstand ±25V
■
Withstands Repeated 10kV ESD Pulses
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
19
5V
6
5V
7
5V
18
0V
1
24
V
CC2
5V
1
24
V
CC1
5V
120Ω
2
LTC1322
1321/22/35 TA01
RX OUT
21
RS485 INTERFACE
DR ENABLE
3
4
5
12
22
DR IN
20
13
V
EE1
–5V
11
19
LTC1322
RX OUT
16
5V
DR ENABLE
10
9
8
7
6
12
15
DR IN
17
5V
18
13
V
EE2
–5V
120Ω
4000-FT 24-GAUGE TWISTED PAIR
5V
0V
8
DR IN
17
3
22
RX OUT
11
14
RX OUT
4
DR IN
21
EIA562 INTERFACE
9
DR IN
16
2
23
RX OUT
10
15
RX OUT
5
DR IN
20
2
LTC1321/LTC1322/LTC1335
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage
V
CC
.................................................................... 6.5V
V
DD
(LTC1321/LTC1322 Only) ........................... 10V
V
EE
................................................................... –10V
Input Voltage
Drivers ................................... –0.3V to (V
CC
+ 0.3V)
Receivers ............................................. –25V to 25V
ON/OFF, LB, SEL1,
SEL2, OE ............................ –0.3V to (V
CC
+ 0.3V)
Output Voltage
Drivers ................................................. –25V to 25V
Receivers ............................... –0.3V to (V
CC
+ 0.3V)
Output Short-Circuit Duration......................... Indefinite
Operating Temperature Range
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
WU
U
PACKAGE
/
O
RDER I FOR ATIO
2 RS485 DRIVERS/RECEIVERS
2 EIA/TIA-562 DRIVERS/RECEIVERS
2 RS485 DRIVERS/RECEIVERS
4 EIA/TIA-562 DRIVERS/RECEIVERS
2 RS485 DRIVERS/RECEIVERS
4 EIA/TIA-562 DRIVERS/RECEIVERS
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
S PACKAGE
24-LEAD PLASTIC SOL
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
B1
A1
Z1
Y1
SEL1
SEL2
Y2
Z2
A2
B2
GND
V
CC
NC
R
A1
DE1
D
Y1
LB
ON/OFF
D
Y2
DE2
R
A2
NC
V
EE
N PACKAGE
24-LEAD PLASTIC DIP
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
B1
A1
Z1
Y1
SEL1
SEL2
Y2
Z2
A2
B2
GND
V
CC
R
B1
R
A1
D
Z1
/DE1
D
Y1
LB
ON/OFF
D
Y2
D
Z2
/DE2
R
A2
R
B2
V
EE
S PACKAGE
24-LEAD PLASTIC SOL
N PACKAGE
24-LEAD PLASTIC DIP
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
OE
B1
A1
Z1
Y1
SEL1
SEL2
Y2
Z2
A2
B2
GND
V
CC
R
B1
R
A1
D
Z1
/DE1
D
Y1
LB
ON/OFF
D
Y2
D
Z2
/DE2
R
A2
R
B2
V
EE
S PACKAGE
24-LEAD PLASTIC SOL
N PACKAGE
24-LEAD PLASTIC DIP
T
JMAX
= 125°C, θ
JA
= 75°C/W (N)
T
JMAX
= 125°C, θ
JA
= 85°C/W (S)
T
JMAX
= 125°C, θ
JA
= 75°C/W (N)
T
JMAX
= 125°C, θ
JA
= 85°C/W (S)
T
JMAX
= 125°C, θ
JA
= 75°C/W (N)
T
JMAX
= 125°C, θ
JA
= 85°C/W (S)
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
LTC1321CN
LTC1321CS
LTC1321IN
LTC1321IS
LTC1335CN
LTC1335CS
LTC1335IN
LTC1335IS
LTC1322CN
LTC1322CS
LTC1322IN
LTC1322IS
Consult factory for Military grade parts.
3
LTC1321/LTC1322/LTC1335
DC ELECTRICAL CHARACTERISTICS
V
CC
= V
DD
(LTC1321/LTC1322) = 5V ±5%, V
EE
= –5V ±5% (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS485 Driver (SEL1 = SEL2 = HIGH)
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 ● 5V
V
OD2
Differential Driver Output Voltage (With Load) Figure 1, R = 50Ω (RS422) ● 2.0 5 V
Figure 1, R = 27Ω (RS485) ● 1.5 5 V
∆V
OD
Change in Magnitude of Driver Differential Figure 1, R = 27Ω or R = 50Ω ● 0.2 V
Output Voltage for Complementary Output States
V
OC
Driver Common-Mode Output Voltage Figure 1, R = 27Ω or R = 50Ω ● 3V
∆V
OC
Change in Magnitude of Driver Common-Mode Figure 1, R = 27Ω or R = 50Ω ● 0.2 V
Output Voltage for Complementary Output States
I
OSD
Driver Short-Circuit Current –7V ≤ V
O
≤ 12V, V
O
= HIGH ● 35 250 mA
–7V ≤ V
O
≤ 12V, V
O
= LOW (Note 4) ● 10 250 mA
I
OZD
Three-State Output Current (Y, Z) –7V ≤ V
O
≤ 12V ● ±5 ±500 µA
EIA/TIA-562 Driver (SEL1 = SEL2 = LOW)
V
O
Output Voltage Swing Figure 4, R
L
= 3k, Positve ● 3.7 4.2 V
Figure 4, R
L
= 3k, Negative ● –3.7 –4.3 V
I
OSD
Output Short-Circuit Current V
O
= 0V ● ±11 ±60 mA
Driver Inputs and Control Inputs
V
IH
Input High Voltage D, DE, ON/OFF, SEL1, SEL2, LB ● 2V
OE (LTC1335) ● 2V
V
IL
Input Low Voltage D, DE, ON/OFF, SEL1, SEL2, LB ● 0.8 V
OE (LTC1335)
● 0.8 V
I
IN
Input Current D, SEL1, SEL2 ● ±10 µA
DE, ON/OFF, LB ● –4 –15 µA
OE (LTC1335)
● 4 15 µA
RS485 Receiver (SEL1 = SEL2 = HIGH)
V
TH
Differential Input Threshold Voltage –7V ≤ V
CM
≤ 7V, Commercial ● –0.2 0.2 V
–7V ≤ V
CM
≤ 7V, Industrial ● –0.3 0.3 V
∆V
TH
Input Hysteresis V
CM
= 0V ● 70 mV
I
IN
Input Current (A, B) –7V ≤ V
IN
≤ 12V ● ±1mA
R
IN
Input Resistance –7V ≤ V
IN
≤ 12V ● 12 24 kΩ
EIA/TIA-562 Receiver (SEL1 = SEL2 = LOW)
V
TH
Receiver Input Voltage Threshold Input Low Threshold ● 0.8 1.1 V
Input High Threshold
● 1.7 2.4 V
∆V
TH
Receiver Input Hysteresis ● 0.1 0.6 1.0 V
R
IN
Receiver Input Resistance V
IN
= ±10V 3 5 7 kΩ
Receiver Output
V
OH
Receiver Output High Voltage I
O
= –3mA, V
IN
= 0V, SEL1 = SEL2 = LOW ● 3.5 4.6 V
V
OL
Receiver Output Low Voltage I
O
= 3mA, V
IN
= 3V, SEL1 = SEL2 = LOW ● 0.2 0.4 V
I
OSR
Short-Circuit Current 0V ≤ V
O
≤ V
CC
● 785mA
I
OZR
Three-State Output Current ON/OFF = 0V ● ±10 µA
OE = V
CC
(LTC1335) ● ±10 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC1322CN#PBF

Mfr. #:
Buy LTC1322CN#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-422/RS-485 Interface IC L/P RS485/RS232 Dvr/Rcvr
Lifecycle:
New from this manufacturer.
Delivery:
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