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LTC1481IS8#PBF

P1-P3P4-P6P7-P8
1
LTC1481
1481fa
Ultralow Power
RS485 Transceiver
with Shutdown
The LTC
®
1481 is an ultralow power differential line trans-
ceiver designed for data transmission standard RS485
applications. It will also meet the requirements of RS422.
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.
The LTC1481 is fully specified over the commercial and
extended industrial temperature range and is available in
8-pin PDIP and SO packages.
■
Low Power: I
CC
= 120µA Max with Driver Disabled
■
Drivers/Receivers Have ±10kV ESD Protection
■
1µA Quiescent Current in Shutdown Mode
■
High Speed: Up to 2.5Mbits/s Data Rate
■
I
CC
= 500µA Max with Driver Enabled, No Load
■
Single 5V Supply
■
–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
■
30ns Typical Driver Propagation Delays
with 5ns Skew
■
Pin Compatible with the LTC485
■
Battery-Powered RS485/RS422 Applications
■
Low Power RS485/RS422 Transceiver
■
Level Translator
TEMPERATURE (°C)
–50
SUPPLY CURRENT (µA)
50
350
300
250
200
150
100
50
0
1481 TA02
0–25 25 75 125 175150100
DRIVER ENABLED
DRIVER DISABLED
THERMAL SHUTDOWN
WITH DRIVER ENABLED
V
CC1
GND1
R
RO1
RE1
DE1
DI1
D
V
CC2
GND2
R
RO2
RE2
DE2
DI2
D
Rt
Rt
LTC1481 • TA01
Supply Current vs Temperature
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1481
1481fa
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) ● 2.0 V
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 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
ORDER PART
NUMBER
LTC1481CN8
LTC1481IN8
LTC1481CS8
LTC1481IS8
(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
LTC1481C ....................................... 0°C ≤ T
A
≤ 70°C
LTC1481I.................................... –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
1481
1481I
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 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
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
3
LTC1481
1481fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 10 30 60 ns
t
PHL
Driver Input to Output ● 10 30 60 ns
t
SKEW
Driver Output to Output ● 510ns
t
r
, t
f
Driver Rise or Fall Time ● 31540ns
t
ZH
Driver Enable to Output High C
L
= 100pF (Figures 4, 6), S2 Closed ● 40 70 ns
t
ZL
Driver Enable to Output Low C
L
= 100pF (Figures 4, 6), S1 Closed ● 40 70 ns
t
LZ
Driver Disable Time from Low C
L
= 15pF (Figures 4, 6), S1 Closed ● 40 70 ns
t
HZ
Driver Disable Time from High C
L
= 15pF (Figures 4, 6), S2 Closed ● 40 70 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 ● 2.5 Mbits/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 ● 40 100 ns
t
ZL(SHDN)
Driver Enable from Shutdown to Output Low C
L
= 100pF (Figures 4, 6), S1 Closed ● 40 100 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)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: All currents into device pins are positive; all currents out of 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.
OUTPUT VOLTAGE (V)
0
70
60
50
40
30
20
10
0
3
1481 G01
12 45
OUTPUT CURRENT (mA)
T
A
= 25°C
Driver Differential Output Voltage
vs Output Current
TEMPERATURE (°C)
–50
DIFFERENTIAL VOLTAGE (V)
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
0
50
75
1481 G02
–25
25
100
125
R
L
= 54Ω
Driver Differential Output Voltage
vs Temperature
Driver Output Low Voltage
vs Output Current
OUTPUT VOLTAGE (V)
10
70
60
50
40
30
20
10
0
4
1481 G03
23
OUTPUT CURRENT (mA)
T
A
= 25°C
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V (Notes 2, 3) unless otherwise noted.
SWITCHI G CHARACTERISTICS
U
TYPICAL PERFOR A CE CHARACTERISTICS
UW
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LTC1481IS8#PBF

Mfr. #:
Buy LTC1481IS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC Ultra-L Pwr RS485 Tran w/ SD
Lifecycle:
New from this manufacturer.
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