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LTC1483CN8#PBF

P1-P3P4-P6P7-P8
1
LTC1483
sn1483 1483fs
Ultra-Low Power RS485 Low EMI
Transceiver with Shutdown
S
F
EA
T
U
RE
D
U
ESCRIPTIO
The LTC
®
1483 is an ultra-low power differential line trans-
ceiver designed for data transmission standard RS485
applications with extended common-mode range (–7V to
12V). It will also meet the requirements of RS422. The
LTC1483 features output drivers with controlled slew rate,
decreasing the EMI radiated from the RS485 lines, and
improving signal fidelity with misterminated lines. The
CMOS design offers significant power savings over its
bipolar counterparts without sacrificing ruggedness against
overload or ESD damage. Typical quiescent current is only
80µA while operating and less than 1µA in shutdown.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common-mode range. Excessive power dissipation
caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. The receiver has a fail-safe
feature which guarantees a high output state when the
inputs are left open. I/O pins are protected against multiple
ESD strikes of over ±10kV.
The LTC1483 is fully specified over the commercial and
extended industrial temperature range and is available in
8-pin DIP and SO packages.
■
Low Power: I
CC
= 120µA Max with Driver Disabled
■
I
CC
= 500µA Max with Driver Enabled, No Load
■
1µA Quiescent Current in Shutdown Mode
■
Controlled Slew Rate Driver for Reduced EMI
■
Single 5V Supply
■
Drivers/Receivers Have ±10kV ESD Protection
■
–7V to 12V Common-Mode Range Permits ±7V
Ground Difference Between Devices on the Data Line
■
Thermal Shutdown Protection
■
Power Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
■
Driver Maintains High Impedance in Three-State
or with the Power Off
■
Up to 32 Transceivers on the Bus
■
Pin Compatible with the LTC485
■
Battery-Powered RS485/RS422 Applications
■
Low Power RS485/RS422 Transceiver
■
Level Translator
U
S
A
O
PP
L
IC
AT
I
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
V
CC1
GND1
R
RO1
RE1
DE1
DI1
D
V
CC2
GND2
R
RO2
RE2
DE2
DI2
D
R
TERM
R
TERM
LTC1483 • TA01
RO
A – B
DI
1483 TA02
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LTC1483
sn1483 1483fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 ● 5V
V
OD2
Differential Driver Output Voltage (with Load) R = 50Ω (RS422) ● 2V
R = 27Ω (RS485), Figure 1
● 1.5 5 V
∆V
OD
Change in Magnitude of Driver Differential Output R = 27Ω or R = 50Ω, Figure 1 ● 0.2 V
Voltage for Complementary Output States
V
OC
Driver Common-Mode Output Voltage R = 27Ω or R = 50Ω, Figure 1 ● 3V
∆V
OC
Change in Magnitude of Driver Common-Mode R = 27Ω or R = 50Ω, Figure 1 ● 0.2 V
Output Voltage for Complementary Output States
V
IH
Input High Voltage DE, DI, RE ● 2V
V
IL
Input Low Voltage DE, DI, RE ● 0.8 V
I
IN1
Input Current DE, DI, RE ● ±2 µA
I
IN2
Input Current (A, B) DE = 0, V
CC
= 0V or 5.25V, V
IN
= 12V ● 1.0 mA
DE = 0, V
CC
= 0V or 5.25V, V
IN
= –7V ● –0.8 mA
V
TH
Differential Input Threshold Voltage for Receiver –7V ≤ V
CM
≤ 12V ● –0.2 0.2 V
∆V
TH
Receiver Input Hysteresis V
CM
= 0V ● 45 mV
V
OH
Receiver Output High Voltage I
O
= –4mA, V
ID
= 200mV ● 3.5 V
V
OL
Receiver Output Low Voltage I
O
= 4mA, V
ID
= –200mV ● 0.4 V
I
OZR
Three-State (High Impedance) Output V
CC
= Max, 0.4V ≤ V
O
≤ 2.4V ● ±1 µA
Current at Receiver
R
IN
Receiver Input Resistance –7V ≤ V
CM
≤ 12V ● 12 25 kΩ
I
CC
Supply Current No Load, Output Enabled ● 300 500 µA
No Load, Output Disabled
● 80 120 µA
I
SHDN
Supply Current in Shutdown Mode DE = 0, RE = V
CC
110µA
I
OSD1
Driver Short-Circuit Current, V
OUT
= HIGH –7V ≤ V
O
≤ 12V ● 35 250 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= LOW –7V ≤ V
O
≤ 12V ● 35 250 mA
I
OSR
Receiver Short-Circuit Current 0V ≤ V
O
≤ V
CC
● 785mA
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
LTC1483CN8
LTC1483IN8
LTC1483CS8
LTC1483IS8
(Note 1)
Supply Voltage (V
CC
) .............................................. 12V
Control Input Voltage..................... –0.5V to V
CC
+ 0.5V
Driver Input Voltage....................... –0.5V to V
CC
+ 0.5V
Driver Output Voltage ........................................... ±14V
Receiver Input Voltage.......................................... ±14V
Receiver Output Voltage ................ –0.5V to V
CC
+ 0.5V
Operating Temperature Range
LTC1483C ....................................... 0°C ≤ T
A
≤ 70°C
LTC1483I.................................... –40°C ≤ T
A
≤ 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
T
JMAX
= 125°C, θ
JA
= 130°C/W (N8)
T
JMAX
= 125°C, θ
JA
= 150°C/W (S8)
S8 PART MARKING
1483
1483I
Consult factory for Military grade parts.
E
LECTR
IC
AL C CHARA TERIST
ICS
V
CC
= 5V, (Notes 2, 3) unless otherwise noted.
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
B
A
GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
R
D
RO
RE
DE
DI
3
LTC1483
sn1483 1483fs
V
CC
= 5V, (Notes 2, 3) unless otherwise noted.
SWITCHI G CHARACTERISTICS
U
Note 2: All currents into device pins are positive; all currents out ot device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
Note 3: All typicals are given for V
CC
= 5V and T
A
= 25°C.
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute maximum ratings are those beyond which the safety of
the device cannot be guaranteed.
Supply Current vs Temperature
Receiver t
PLH
– t
PHL
vs
Temperature
TEMPERATURE (°C)
–50
14
12
10
8
6
4
2
0
25 75
1483 G02
–25 0
50 100 125
t
PLH
– t
PHL
(ns)
Driver Differential Output Voltage
vs Output Current
OUTPUT VOLTAGE (V)
0
70
60
50
40
30
20
10
0
3
1483 G03
12 45
OUTPUT CURRENT (mA)
T
A
= 25°C
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
SUPPLY CURRENT (µA)
50
350
300
250
200
150
100
50
0
1483 G01
0–25 25 75 125 175150100
DRIVER ENABLED
DRIVER DISABLED
THERMAL SHUTDOWN
WITH DRIVER ENABLED
LTC1483
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 150 1200 ns
t
PHL
Driver Input to Output ● 150 1200 ns
t
SKEW
Driver Output to Output ● 100 600 ns
t
r
, t
f
Driver Rise or Fall Time ● 150 1200 ns
t
ZH
Driver Enable to Output High C
L
= 100pF (Figures 4, 6), S2 Closed ● 100 1500 ns
t
ZL
Driver Enable to Output Low C
L
= 100pF (Figures 4, 6), S1 Closed ● 100 1500 ns
t
LZ
Driver Disable Time from Low C
L
= 15pF (Figures 4, 6), S1 Closed ● 150 1500 ns
t
HZ
Driver Disable Time from High C
L
= 15pF (Figures 4, 6), S2 Closed ● 150 1500 ns
t
PLH
Receiver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 30 140 200 ns
t
PHL
Receiver Input to Output ● 30 140 200 ns
t
SKD
t
PLH
– t
PHL
Differential Receiver Skew ● 13 ns
t
ZL
Receiver Enable to Output Low C
RL
= 15pF (Figures 2, 8), S1 Closed ● 20 50 ns
t
ZH
Receiver Enable to Output High C
RL
= 15pF (Figures 2, 8), S2 Closed ● 20 50 ns
t
LZ
Receiver Disable from Low C
RL
= 15pF (Figures 2, 8), S1 Closed ● 20 50 ns
t
HZ
Receiver Disable from High C
RL
= 15pF (Figures 2, 8), S2 Closed ● 20 50 ns
f
MAX
Maximum Data Rate ● 250 kbits/s
t
SHDN
Time to Shutdown DE = 0, RE = ● 50 200 600 ns
t
ZH(SHDN)
Driver Enable from Shutdown to Output High C
L
= 100pF (Figures 4, 6), S2 Closed ● 2000 ns
t
ZL(SHDN)
Driver Enable from Shutdown to Output Low C
L
= 100pF (Figures 4, 6), S1 Closed ● 2000 ns
t
ZH(SHDN)
Receiver Enable from Shutdown to Output High C
L
= 15pF (Figures 2, 8), S2 Closed ● 3500 ns
t
ZL(SHDN)
Receiver Enable from Shutdown to Output Low C
L
= 15pF (Figures 2, 8), S1 Closed ● 3500 ns
(Figures 3, 5)
(Figures 3, 7)
P1-P3P4-P6P7-P8

LTC1483CN8#PBF

Mfr. #:
Buy LTC1483CN8#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC Ultra-L Pwr RS485 L EMI Tran w/ SD
Lifecycle:
New from this manufacturer.
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