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PDF LTC1321CS Data sheet ( Hoja de datos )
| Número de pieza | LTC1321CS | |
| Descripción | RS232/EIA562/RS485 Transceivers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1321/LTC1322/LTC1335
RS232/EIA562/RS485
Transceivers
FEATURES
s LTC1321: 2-EIA562/RS232 Transceivers/2-RS485
Transceivers
s LTC1322: 4-EIA562/RS232 Transceivers/2-RS485
Transceivers
s LTC1335: 4-EIA562 Transceivers/2-RS485
Transceivers with OE
s LTC1321/LTC1322 Have the Same Pinout as
SP301/SP302
s LTC1335 Features Receiver Three-State Outputs
s Low Supply Current: 1mA Typical
s 15µA Supply Current in Shutdown
s 120kBaud in EIA/TIA-562 or RS232 Mode
s 10MBaud in RS485/RS422 Mode
s Self-Testing Capability in Loopback Mode
s Power-Up/Down Glitch-Free Outputs
s Driver Maintains High Impedance in Three-State,
Shutdown or With Power Off
s Thermal Shutdown Protection
s I/O Lines Can Withstand ±25V
s Withstands Repeated 10kV ESD Pulses
U
APPLICATIONS
s Low Power RS485/RS422/EIA562/RS232 Interface
s Cable Repeater
s Level Translator
DESCRIPTIO
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 ≤ 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.
TYPICAL APPLICATI
VCC1
5V
RX OUT
DR ENABLE
24
1
22
21
20
DR IN
5V
5V
DR IN
DR IN
RX OUT
RX OUT
VEE1
–5V
19
18
17
16
15
14
13
LTC1322
2
3
4
5
6 5V
7 0V
8
9
10
11
12
120Ω
RS485 INTERFACE
120Ω
4000-FT 24-GAUGE TWISTED PAIR
EIA562 INTERFACE
11
10
9
8
7
5V
0V 6
3
2
5
4
12
LTC1322
24
1
15
RX OUT
16
DR ENABLE
17 DR IN
19 5V
18 5V
22 RX OUT
23 RX OUT
20
DR IN
21
DR IN
13 VEE2
–5V
VCC2
5V
1321/22/35 TA01
1
1 page  
LTC1321/LTC1322/LTC1335
TYPICAL PERFORMANCE CHARACTERISTICS
RS485 Driver Differential Output
Voltage vs Temperature
2.6
2.5 RL = 54Ω
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1321 G01
RS485 Driver Output High Voltage
vs Output Current
–80
TA = 25°C
–70
–60
–50
–40
–30
–20
–10
0
0 1 2 3 45
OUTPUT VOLTAGE (V)
1321 G04
EIA562 Driver Output Voltage
vs Temperature
5
4 OUTPUT HIGH
3
2
1
RL = 3k
0
–1
–2
–3
–4 OUTPUT LOW
–5
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1321 G07
RS485 Driver Differential Output
Current vs Output Voltage
70
TA = 25°C
60
50
40
30
20
10
0
01 2 345
DIFFERENTIAL OUTPUT VOLTAGE (V)
1321 G02
RS485 Driver Output Low Voltage
vs Output Current
120
TA = 25°C
100
80
60
40
20
0
01 2 3 4
OUTPUT VOLTAGE (V)
5
1321 G05
EIA562 Driver Output Voltage
vs Supply Voltage
10
8
RL = 3k
TA = 25°C
6 VEE = –VDD
4
OUTPUT HIGH
2
0
–2
–4
–6 OUTPUT LOW
–8
–10
4
56789
VDD SUPPLY VOLTAGE (V)
10
1321 G08
RS485 Driver Skew vs
Temperature
15
12
9
6
3
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1321 G03
RS485 Driver Output Short-Circuit
Current vs Temperature
160
140
120
SINK
(VOUT = 5V)
100
80
SOURCE
(VOUT = 0V)
60
40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1321 G19
EIA562 Driver Output Short-Circuit
Current vs Temperature
18
VOUT = 0V
16
14
SOURCE
12
10
SINK
8
6
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1321 G09
5
5 Page 
LTC1321/LTC1322/LTC1335
BLOCK DIAGRA SM
LTC1322/LTC1335 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
*VDD/OE 1 *
24 VCC *VDD/OE 1 *
24 VCC *VDD/OE
23 RB1
1*
24 VCC *VDD/OE 1 *
24 VCC
23 RB1
Z1
Y1
SEL1
SEL2
4
5
6
7
8
Y2
Z2 9
12
GND
23
RB1
22 RA1
21 DZ1
20 DY1
19
LB
18 ON
17 DY2
16 DZ2
15 RA2
14
13
RB2
VEE
Z1 4
Y1
**SEL1
SEL2
5
6
7
8
Y2
9
Z2
GND 12
22
RA1
21
DE1
20
DY1
19 LB
18 ON
17 DY2
16
DZ2
15 RA2
14
13
RB2
VEE
Z1
Y1
SEL1
4
5
6
**SEL2
Y2
7
8
9
Z2
12
GND
23
RB1
22 RA1
21 DZ1
20 DY1
Z1
Y1
19
LB
**SEL1
18 **SEL2
ON
17 DY2
Y2
4
5
6
7
8
16 DE2
15
RA2
14
13
RB2
VEE
9
Z2
12
GND
22 RA1
21 DE1
20 DY1
19
LB
18
ON
17 DY2
16 DE2
15
RA2
14
13
RB2
VEE
* FOR LTC1322 ONLY, PIN 1 IS VDD, AND OE IS ALWAYS ENABLED.
FOR LTC1335, PIN 1 IS OE, AND VDD IS CONNECTED TO VCC.
** SEL1/SEL2 = VCC.
1322/35 BD02
TEST CIRCUITS
Y
R
VOD
R VOC
Z
1321/22/35 F01
Figure 1. RS485 Driver
Test Load
0V
SEL
D Y OR Z
CL
RL
1321/22/35 F04
Figure 4. EIA/TIA-562 Driver
Timing Test Circuit
3V
SEL Y
D
DE Z
3V
RL
3V
CL
A
SEL
R
CL B OE
0V
15pF
1321/22/35 F02
Figure 2. RS485 Driver/Receiver
Timing Test Circuit
0V
SEL
D Y OR Z
0V
SEL
A OR B
R
OE
0V
15pF
1321/22/35 F05
Figure 5. EIA/TIA-562 Receiver
Timing Test Circuit
DR OUT
VCC
500Ω
S1
CL S2
1321/22/35 F03
Figure 3. RS485 Driver Output
Enable/Disable Timing Test Load
VCC
RX OUT
S1
1k
CL S2
1321/22/35 F06
Figure 6. Receiver Output
Enable/Disable Timing Test Load
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC1321CS.PDF ] | |
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