OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC1334ISW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1334
Single 5V RS232/RS485
Multiprotocol Transceiver
The LTC
®
1334 is a low power CMOS
bidirectional trans-
ceiver featuring two
reconfigurable interface ports. It can
be configured as two RS485 differential ports, as two dual
RS232 single-ended ports or as one RS485 differential
port and one dual RS232 single-ended port. An onboard
charge pump requires four 0.1µF capacitors to generate
boosted positive and negative supplies, allowing the RS232
drivers to meet the RS232 ±5V output swing requirement
with only a single 5V supply. A shutdown mode reduces
the I
CC
supply current to 10µA.
The RS232 transceivers are in full compliance with RS232
specifications. The RS485 transceivers are in full compli-
ance with RS485 and RS422 specifications. All interface
drivers feature short-circuit and thermal shutdown pro-
tection. An enable pin allows RS485 driver outputs to be
forced into high impedance, which is maintained 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 allows the driver
outputs to be connected back to the receiver inputs for
diagnostic self-test.
■
Four RS232 Transceivers or Two RS485
Transceivers on One Chip
■
Operates from a Single 5V Supply
■
Withstands Repeated ±10kV ESD Pulses
■
Uses Small Charge Pump Capacitors: 0.1µF
■
Low Supply Current: 8mA Typical
■
10µA Supply Current in Shutdown
■
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
■
Receiver Inputs Can Withstand ±25V
■
Low Power RS485/RS422/RS232/EIA562 Interface
■
Software-Selectable Multiprotocol Interface Port
■
Cable Repeaters
■
Level Translators
, LTC and LT are registered trademarks of Linear Technology Corporation.
21
5V
8
5V
9
5V
20
0V
26
3
26
3
2728
V
CC1
5V
120Ω
4
LTC1334
LTC1334 • TA01
RX OUT
23
RS485 INTERFACE
DR ENABLE
5
6
7
14
24
DR IN
22
15
13
21
LTC1334
RX OUT
18
5V
DR ENABLE
12
11
10
9
8
14
17
DR IN
19
5V
20
15
120Ω
4000-FT 24-GAUGE TWISTED PAIR
5V
0V
11
DR IN
19
4
24
RX OUT
12
16
RX OUT
7
DR IN
23
RS232 INTERFACE
ALL CAPACITORS: 0.1µF MONOLITHIC CERAMIC TYPE
10
DR IN
18
5
25
RX OUT
13
17
RX OUT
6
DR IN
22
12
212827
V
CC2
5V
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1334
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
ORDER PART
NUMBER
LTC1334CG
LTC1334CNW
LTC1334CSW
LTC1334IG
LTC1334ISW
(Note 1)
Supply Voltage (V
CC
) ............................................. 6.5V
Input Voltage
Drivers ................................... –0.3V to (V
CC
+ 0.3V)
Receivers ............................................. –25V to 25V
ON/OFF, LB, SEL1, SEL2 ........ –0.3V to (V
CC
+ 0.3V)
Output Voltage
Drivers ................................................. –18V to 18V
Receivers ............................... –0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration
Output ........................................................ Indefinite
V
DD
, V
EE
, C1
+
, C1
–
, C2
+
, C2
–
.......................... 30 sec
Operating Temperature Range
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
WU
U
PACKAGE
/
O
RDER I FOR ATIO
T
JMAX
= 125°C, θ
JA
= 90°C/W (G)
T
JMAX
= 125°C, θ
JA
= 56°C/W (NW)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C2
+
C2
–
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
C1
+
C1
–
V
DD
A1
B1
Y1
Z1
SEL1
SEL2
Z2
Y2
B2
A2
GND
SW PACKAGE
28-LEAD PLASTIC SO WIDE
G PACKAGE
28-LEAD PLASTIC SSOP
NW PACKAGE
28-LEAD PDIP WIDE
Consult factory for Military grade parts.
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS485 Driver (SEL1 = SEL2 = High)
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 ● 6V
V
OD2
Differential Driver Output Voltage (With Load) Figure 1, R = 50Ω (RS422) ● 2.0 6 V
Figure 1, R = 27Ω (RS485) ● 1.5 6 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
RS232 Driver (SEL1 = SEL2 = Low)
V
O
Output Voltage Swing Figure 4, R
L
= 3k, Positive ● 5 6.5 V
Figure 4, R
L
= 3k, Negative ● –5 –6.5 V
I
OSD
Output Short-Circuit Current V
O
= 0V ● ±60 mA
Driver Inputs and Control Inputs
V
IH
Input High Voltage D, DE, ON/OFF, SEL1, SEL2, LB ● 2V
V
IL
Input Low Voltage D, DE, ON/OFF, SEL1, SEL2, LB ● 0.8 V
I
IN
Input Current D, SEL1, SEL2 ● ±10 µA
DE, ON/OFF, LB
● –4 –15 µA
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3)
3
LTC1334
AC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS485 Receiver (SEL1 = SEL2 = High)
V
TH
Differential Input Threshold Voltage –7V ≤ V
CM
≤ 12V, LTC1334C ● –0.2 0.2 V
–7V ≤ V
CM
≤ 7V, LTC1334I ● –0.3 0.3 V
∆V
TH
Input Hysteresis V
CM
= 0V 70 mV
I
IN
Input Current (A, B) V
IN
= –7V ● –0.8 mA
V
IN
= 12V ● 1.0 mA
R
IN
Input Resistance –7V ≤ V
IN
≤ 12V ● 12 24 kΩ
RS232 Receiver (SEL1 = SEL2 = Low)
V
TH
Receiver Input Threshold Voltage Input Low Threshold ● 0.8 V
Input High Threshold
● 2.4 V
∆V
TH
Receiver Input Hysteresis 0.6 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 = Low ● ±10 µA
R
OB
Inactive “B” Output Pull-Up Resistance (Note 5) ON/OFF = High, SEL1 = SEL2 = High 50 kΩ
Power Supply Generator
V
DD
V
DD
Output Voltage No Load, ON/OFF = High 8.5 V
I
DD
= –10mA, ON/OFF = High 7.6 V
V
EE
V
EE
Output Voltage No Load, ON/OFF = High –7.7 V
I
EE
= 10mA, ON/OFF = High –6.9 V
Power Supply
I
CC
V
CC
Supply Current No Load, SEL1 = SEL2 = High ● 825 mA
No Load Shutdown, ON/OFF = 0V
● 10 100 µA
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RS232 Mode (SEL1 = SEL2 = Low)
SR Slew Rate Figure 4, R
L
= 3k, C
L
= 15pF ● 30 V/µs
Figure 4, R
L
= 3k, C
L
= 1000pF ● 4V/µs
t
T
Transition Time Figure 4, R
L
= 3k, C
L
= 2500pF ● 0.22 1.9 3.1 µs
t
PLH
Driver Input to Output Figures 4, 9, R
L
= 3k, C
L
= 15pF ● 0.6 4 µs
t
PHL
Driver Input to Output Figures 4, 9, R
L
= 3k, C
L
= 15pF ● 0.6 4 µs
t
PLH
Receiver Input to Output Figures 5, 10 ● 0.3 6 µs
t
PHL
Receiver Input to Output Figures 5, 10 ● 0.4 6 µs
RS485 Mode (SEL1 = SEL2 = High)
t
PLH
Driver Input to Output Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 20 40 70 ns
t
PHL
Driver Input to Output Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 20 40 70 ns
t
SKEW
Driver Output to Output Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 515 ns
t
r
, t
f
Driver Rise and Fall Time Figures 2, 6, R
L
= 54Ω, C
L
= 100pF ● 31540 ns
DC ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3)
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1334ISW#PBF

Mfr. #:
Buy LTC1334ISW#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC +5V Multi Protocol Transceiver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet