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LTC1484CMS8#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1484
Low Power
RS485 Transceiver
with Receiver Fail-Safe
■
No Damage or Latchup to
±
15kV ESD (Human
Body Model), IEC-1000-4-2 Level 4 Contact (
±
8kV)
and Level 3 (
±
8kV) Air Gap Specifications
■
Guaranteed High Receiver Output State for Floating,
Shorted or Terminated Inputs with No Signal
Present
■
Drives Low Cost Residential Telephone Wires
■
Low Power: I
CC
= 700µA Max with Driver Disabled
■
I
CC
= 900µA Max for Driver Enable with No Load
■
20µA Max Quiescent Current in Shutdown Mode
■
Single 5V Supply
■
–7V to 12V Common Mode Range Permits ±7V
Ground Difference Between Devices on the Data Line
■
Power Up/Down Glitch-Free Driver Outputs
■
Up to 32 Transceivers on the Bus
■
Pin Compatible with the LTC485
■
Available in 8-Lead MSOP, PDIP and SO Packages
The LTC
®
1484 is a low power RS485 compatible trans-
ceiver. In receiver mode, it offers a fail-safe feature which
guarantees a high receiver output state when the inputs
are left open, shorted together or terminated with no
signal present. No external components are required to
ensure the high receiver output state.
Both driver and receiver feature three-state outputs with
separate receiver and driver control pins. The driver
outputs maintain high impedance over the entire com-
mon mode range when three-stated. Excessive power
dissipation caused by bus contention or faults is pre-
vented by a thermal shutdown circuit that forces the
driver outputs into a high impedance state.
Enhanced ESD protection allows the LTC1484 to with-
stand ±15kV (human body model), IEC-1000-4-2 level 4
(±8kV) contact and level 3 (±8kV) air discharge ESD
without latchup or damage.
The LTC1484 is fully specified over the commercial and
industrial temperature ranges and is available in 8-lead
MSOP, PDIP and SO packages.
■
Battery-Powered RS485/RS422 Applications
■
Low Power RS485/RS422 Transceiver
■
Level Translator
, LTC and LT are registered trademarks of Linear Technology Corporation.
RO1
RE1
DE1
DI1
R
V
CC1
LTC1484
GND1
B1
A1
B2
A2
120Ω 120Ω
D
V
CC2
GND2
1484 TA01
R
D
RO2
RE2
DE2
DI2
LTC1484
RS485 Interface
APPLICATIO S
U
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
Driving a 2000 Foot STP Cable
Dl1 ↑↓ DE1 = V
CC
1484 TA01a
Dl2 = 0 DE2 = 0
RE1 = RE2 = 0
Dl1
B2
A2
RO2
2
LTC1484
ABSOLUTE MAXIMUM RATINGS
W
WW
U
(Note 1)
Supply Voltage (V
CC
)............................................... 6.5V
Control Input Voltages ................. –0.3V to (V
CC
+ 0.3V)
Driver Input Voltage ..................... –0.3V to (V
CC
+ 0.3V)
Driver Output Voltages ................................. –7V to 10V
Receiver Input Voltages (Driver Disabled) .. –12V to 14V
Receiver Output Voltage............... –0.3V to (V
CC
+ 0.3V)
Junction Temperature .......................................... 125°C
Operating Temperature Range
LTC1484C .........................................0°C ≤ T
A
≤ 70°C
LTC1484I...................................... –40°C ≤ T
A
≤ 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V ±5% (Notes 2 and 3) unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OD1
Differential Driver Output Voltage (Unloaded) I
OUT
= 0 ● V
CC
V
V
OD2
Differential Driver Output Voltage (with Load) R = 50Ω (RS422) ● 2V
R = 27Ω (RS485) Figure 1
● 1.5 5 V
R = 22Ω, Figure 1
● 1.5 5 V
V
OD3
Differential Driver Output Voltage V
TST
= –7V to 12V, Figure 2 ● 1.5 5 V
(with Common Mode)
∆V
OD
Change in Magnitude of Driver Differential R = 22Ω, 27Ω or R = 50Ω, Figure 1 ● 0.2 V
Output Voltage for Complementary Output States V
TST
= –7V to 12V, Figure 2
V
OC
Driver Common Mode Output Voltage R = 22Ω, 27Ω or R = 50Ω, Figure 1 ● 3V
∆|V
OC
| Change in Magnitude of Driver Common Mode R = 22Ω, 27Ω or R = 50Ω, Figure 1 ● 0.2 V
Output Voltage for Complementary Output States
V
IH
Input High Voltage DE, DI, RE ● 2.0 V
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
= 0 or 5V, V
IN
= 12V ● 1.0 mA
DE = 0, V
CC
= 0 or 5V, V
IN
= –7V ● –0.8 mA
V
TH
Differential Input Threshold Voltage for Receiver –7V ≤ V
CM
≤ 12V, DE = 0 ● –0.20 –0.015 V
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART
NUMBER
ORDER PART
NUMBER
LTC1484CMS8 LTC1484CN8
LTC1484CS8
LTC1484IN8
LTC1484IS8
S8 PART MARKING
1484
1484I
MS8 PART MARKING
LTDX
T
JMAX
= 125°C, θ
JA
= 200°C/ W
T
JMAX
= 125°C, θ
JA
= 130°C/ W (N8)
T
JMAX
= 125°C, θ
JA
= 135°C/W (S8)
Consult factory for Military grade parts.
1
2
3
4
RO
RE
DE
DI
8
7
6
5
V
CC
B
A
GND
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
1
2
3
4
8
7
6
5
TOP VIEW
RO
RE
DE
DI
V
CC
B
A
GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
R
D
3
LTC1484
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
∆V
TH
Receiver Input Hysteresis V
CM
= 0V, DE = 0 ● ±30 mV
V
OH
Receiver Output High Voltage I
OUT
= –4mA, (V
A
– V
B
) = 200mV ● 3.5 V
V
OL
Receiver Output Low Voltage I
OUT
= 4mA, (V
A
– V
B
) = –200mV ● 0.4 V
I
OZR
Three-State (High Impedance) Output Current V
CC
= Max, 0.4V ≤ V
OUT
≤ 2.4V, ● ±1 µA
at Receiver DE = 0
R
IN
Receiver Input Resistance –7V ≤ V
CM
≤ 12V ● 12 22 kΩ
I
CC
Supply Current No Load, Output Enabled (DE = V
CC
) ● 600 900 µA
No Load, Output Disabled (DE = 0)
● 400 700 µA
I
SHDN
Supply Current in Shutdown Mode DE = 0, RE = V
CC
, DI = 0 ● 120 µA
I
OSD1
Driver Short-Circuit Current, V
OUT
= High (Note 4) –7V ≤ V
OUT
≤ 10V 35 250 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= Low (Note 4) –7V ≤ V
OUT
≤ 10V 35 250 mA
I
OSR
Receiver Short-Circuit Current 0V ≤ V
OUT
≤ V
CC
● 785mA
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V ±5% (Notes 2 and 3) unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SWITCHING CHARACTERISTICS
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF ● 10 28.5 60 ns
(Figures 4, 6)
t
PHL
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF ● 10 31 60 ns
(Figures 4, 6)
t
SKEW
Driver Output to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF ● 2.5 10 ns
(Figures 4, 6)
t
r
, t
f
Driver Rise or Fall Time R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF ● 31540 ns
(Figures 4, 6)
t
ZH
Driver Enable to Output High C
L
= 100pF (Figures 5, 7) S2 Closed ● 40 70 ns
t
ZL
Driver Enable to Output Low C
L
= 100pF (Figures 5, 7) S1 Closed ● 40 100 ns
t
LZ
Driver Disable Time from Low C
L
= 15pF (Figures 5, 7) S1 Closed ● 40 70 ns
t
HZ
Driver Disable Time from High C
L
= 15pF (Figures 5, 7) S2 Closed ● 40 70 ns
t
PLH
Receiver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 30 160 200 ns
(Figures 4, 8)
t
PHL
Receiver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, ● 30 140 200 ns
(Figures 4, 8)
t
SKD
|t
PLH
– t
PHL
| Differential Receiver Skew R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF, 20 ns
(Figures 4, 8)
t
ZL
Receiver Enable to Output Low C
RL
= 15pF (Figures 3, 9) S1 Closed ● 20 50 ns
t
ZH
Receiver Enable to Output High C
RL
= 15pF (Figures 3, 9) S2 Closed ● 20 50 ns
t
LZ
Receiver Disable from Low C
RL
= 15pF (Figures 3, 9) S1 Closed ● 20 50 ns
t
HZ
Receiver Disable from High C
RL
= 15pF (Figures 3, 9) S2 Closed ● 20 50 ns
t
DZR
Driver Enable to Receiver Valid R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF ● 1600 3000 ns
(Figures 4, 10)
f
MAX
Maximum Data Rate (Note 5) ● 4 5 Mbps
t
SHDN
Time to Shutdown (Note 6) DE = 0, RE↑ ● 50 300 600 ns
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1484CMS8#TRPBF

Mfr. #:
Buy LTC1484CMS8#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC L Pwr RS485 Tran w/ Rcv Fail-Safe
Lifecycle:
New from this manufacturer.
Delivery:
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