LTC1321 LINER [Linear Technology], LTC1321 Datasheet

no-image

LTC1321

Manufacturer Part Number
LTC1321
Description
RS232/EIA562/RS485 Transceivers
Manufacturer
LINER [Linear Technology]
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1321CN
Manufacturer:
IXYS
Quantity:
111
Part Number:
LTC1321CS
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1321CSW#PBF
Manufacturer:
Vishay
Quantity:
14 827
Part Number:
LTC1321CSW#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1321IN#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1321ISW
Manufacturer:
LT
Quantity:
23
Part Number:
LTC1321ISW
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURE
TYPICAL
APPLICATIONS
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
15 A 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
Low Power RS485/RS422/EIA562/RS232 Interface
Cable Repeater
Level Translator
V
CC1
5V
S
A
PPLICATI
DR ENABLE
U
V
RX OUT
–5V
RX OUT
EE1
RX OUT
DR IN
DR IN
DR IN
5V
5V
24
22
20
19
18
21
17
16
15
14
13
1
O
LTC1322
U
2
4
6
11
12
3
5
7
8
9
10
5V
0V
120
4000-FT 24-GAUGE TWISTED PAIR
RS485 INTERFACE
EIA562 INTERFACE
D
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
LTC1335 supports receiver output enable but not RS232
levels. A shutdown mode reduces the I
to 15 A.
ESCRIPTIO
120
LTC1321/LTC1322/LTC1335
V
5V
0V
RS232/EIA562/RS485
DD
11
10
12
9
8
7
6
3
2
4
5
U
10V and – 6.5V
LTC1322
15
16
17
19
18
22
23
21
13
24
1
20
Transceivers
RX OUT
DR ENABLE
DR IN
5V
5V
RX OUT
RX OUT
DR IN
DR IN
V
–5V
EE2
CC
V
EE
1321/22/35 TA01
supply current
V
5V
CC2
– 10V. The
1

Related parts for LTC1321

LTC1321 Summary of contents

Page 1

... 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 LTC1335 supports receiver output enable but not RS232 levels ...

Page 2

... Output Voltage Drivers ................................................. – 25V to 25V Receivers ............................... – 0. Output Short-Circuit Duration ......................... Indefinite Operating Temperature Range + 0.3V) LTC1321C/LTC1322C/LTC1335C ......... LTC1321I/LTC1322I/LTC1335I ......... – Storage Temperature Range ................ – 150 C + 0.3V) Lead Temperature (Soldering, 10 sec)................ 300 RS485 DRIVERS/RECEIVERS 4 EIA/TIA-562 DRIVERS/RECEIVERS ...

Page 3

... DC ELECTRICAL CHARACTERISTICS (LTC1321/LTC1322 5 SYMBOL PARAMETER RS485 Driver (SEL1 = SEL2 = HIGH) V Differential Driver Output Voltage (Unloaded) OD1 V Differential Driver Output Voltage (With Load) OD2 V Change in Magnitude of Driver Differential OD Output Voltage for Complementary Output States V Driver Common-Mode Output Voltage OC V Change in Magnitude of Driver Common-Mode ...

Page 4

... V Supply Current Supply Current (LTC1321/LTC1322 Supply Current ELECTRICAL CHARACTERISTICS (LTC1321/LTC1322 5 SYMBOL PARAMETER EIA/TIA-562 Mode (SEL1 = SEL2 = LOW) SR Slew Rate t Transition Time T t Driver Input to Output PLH t Driver Input to Output PHL t Receiver Input to Output ...

Page 5

... –1 –2 –3 OUTPUT LOW –4 –5 –50 – 100 125 TEMPERATURE (°C) 1321 G07 LTC1321/LTC1322/LTC1335 RS485 Driver Differential Output Current vs Output Voltage 25° DIFFERENTIAL OUTPUT VOLTAGE (V) 1321 G02 ...

Page 6

... LTC1321/LTC1322/LTC1335 W U TYPICAL PERFORMANCE CHARACTERISTICS Receiver Output High Voltage vs Temperature 5 3mA OUT 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 –50 – 100 125 TEMPERATURE (°C) 1321 G10 Receiver Output Current vs Output High Voltage 120 T = 25° 2.0 2.5 3.5 4.0 4.5 5.0 3.0 OUTPUT VOLTAGE (V) 1321 G13 Driver Output Leakage Current (Disable/Shutdown) vs Temperature ± ...

Page 7

... Mode. R (Pin 22): Receiver Output (Pin 23): No Connection. V (Pin 24): Positive Supply; 4.75V V CC LTC1321/LTC1322/LTC1335 LTC1322/LTC1335 OE/V (Pin 1): For LTC1335, pin 1 is the receiver DD output enable with internal pull-down. For LTC1322, pin 1 is the positive supply input for EIA/TIA-562 drivers. B1: (Pin 2): Receiver Input. ...

Page 8

... LTC1321/LTC1322/LTC1335 CTIO TABLES LTC1321 RS485 Driver Mode INPUTS LINE ON/OFF SEL DE D CONDITION Fault Fault Fault RS485 Receiver Mode INPUTS ON/OFF SEL A – < – 0. > 0. Inputs Open ...

Page 9

... EIA562 Receiver Mode OUTPUT R ON/OFF LTC1321 Interface Configuration Without Loopback PORT 1 = RS485 MODE PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE PORT 2 = RS485 MODE DE1 ...

Page 10

... FOR LTC1322 ONLY, PIN AND OE IS ALWAYS ENABLED. DD FOR LTC1335, PIN 1 IS OE, AND V IS CONNECTED SEL1/SEL2 = LTC1321 Interface Configuration With Loopback PORT 1 = RS485 MODE PORT 1 = EIA562 MODE PORT 2 = EIA562 MODE PORT 2 = RS485 MODE ...

Page 11

... Figure 2. RS485 Driver/Receiver Timing Test Circuit 0V 0V SEL SEL 15pF 0V 1321/22/35 F05 Figure 5. EIA/TIA-562 Receiver Timing Test Circuit LTC1321/LTC1322/LTC1335 PORT 1 = RS485 MODE PORT 2 = RS485 MODE / ...

Page 12

... LTC1321/LTC1322/LTC1335 U SWITCHI G WAVEFOR – Z – OD2 A – B –V OD2 – 1MHz: t 10ns: t 10ns r f 1.5V t PLH 90 V(Y) – V(Z) DIFF 50% 10% 1 ...

Page 13

... Each port may be configured as single-ended EIA562 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 receivers per port ...

Page 14

... 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. LocalTalk and AppleTalk are registered trademarks of Apple Computer, Inc. ...

Page 15

... RFI 100pF Figure 15. Apple LocalTalk Implemented Using LTC1320 and LTC1335 Transceivers 120 120 22 100pF Figure 16. AppleTalk Direct Connect Using LTC1320 for DTE and LTC1335 for DCE Transceivers LTC1321/LTC1322/LTC1335 RFI 1k 3 RFI 4 RFI 5 RFI 6 SEL1 LTC1335 ...

Page 16

... LTC1321/LTC1322/LTC1335 TYPICAL PPLICATI 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. A typical connection for RS485 transceiver is shown in Figure 19. A twisted pair of wires connects drivers 1/2 LTC1322 17 EIA562 RS232 ...

Page 17

... LTC1322/LTC1335 RX OUT 100 5 2 100 3 Figure 20. Typical Connection for RS422 Interface 100 3 1/2 LTC1322/LTC1335 Figure 21. Typical Cable Repeater for RS422 Interface LTC1321/LTC1322/LTC1335 1/2 LTC1322/LTC1335 OUT ENABLE 1321/22/35 F20 OUT 5 1321/22/35 F21 17 ...

Page 18

... Figure 22. Typical EIA562/RS232 to RS422 Level Translator EIA562/RS232* LTC1322/LTC1335 8 TX OUT Figure 23. Typical Cable Extension for EIA562/RS232 Interface 18 S Using two LTC1321/LTC1335 as level translators, the EIA562/RS232 interface distance can be extended to 4000 feet with twisted wires (Figure 23). is between 6. LTC1322/LTC1335 ...

Page 19

... S Package 24-Lead Plastic SOL NOTE 0.093 – 0.104 (2.362 – 2.642) 0° – 8° TYP 0.050 (1.270) TYP 0.014 – 0.019 (0.356 – 0.482) LTC1321/LTC1322/LTC1335 1.265 (32.131 0.065 (1.651) TYP 0.018 ± ...

Page 20

... LTC1321/LTC1322/LTC1335 NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" ...

Related keywords