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LTC487ISW#PBF

P1-P3P4-P6P7-P9P10-P12
LTC487
1
487fc
Typical applicaTion
DescripTion
Quad Low Power
RS485 Driver
The LTC
®
487 is a low power differential bus/line driver
designed for multipoint data transmission standard RS485
applications with extended common mode range (–7V to
12V). It also meets RS422 requirements.
The CMOS design offers significant power savings over
its bipolar counterpart without sacrificing ruggedness
against overload or ESD damage.
The driver features three-state outputs, with the driver
outputs maintaining high impedance over the entire com-
mon 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.
Both AC and DC specifications are guaranteed from 0°C to
70°C (Commercial), –40°C to 85°C (Industrial) and over
the 4.75V to 5.25V supply voltage range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
FeaTures
applicaTions
n
Very Low Power: I
CC
= 110µA Typ
n
Designed for RS485 or RS422 Applications
n
Single 5V Supply
n
–7V to 12V Bus Common Mode Range Permits ±7V
GND Difference Between Devices on the Bus
n
Thermal Shutdown Protection
n
Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion/Removal of Package
n
Driver Maintains High Impedance in Three-State or
with the Power Off
n
28ns Typical Driver Propagation Delays with
5ns Skew
n
Pin Compatible with the SN75174, DS96174,
µA96174, and DS96F174
n
Low Power RS485/RS422 Drivers
n
Level Translator
2
DRIVER
LTC487 TA01
RECEIVER
DI
EN 12
4
3
1
1/4 LTC487
120Ω 120Ω
RO
3
EN 12
4
2
1
1/4 LTC489
4000 FT BELDEN 9841
DATA RATE (bps)
10k
10
CABLE LENGTH (FT)
100
1k
10k
100k 1M 10M
LTC487 TA09
2.5M
RS485 Cable Length Specification*
* APPLIES FOR 24 GAUGE, POLYETHYLENE
DIELECTRIC TWISTED PAIR
LTC487
2
487fc
pin conFiguraTionabsoluTe MaxiMuM raTings
Supply Voltage (V
CC
) ................................................12V
Control Input Voltages .................... –0.5V to V
CC
+ 0.5V
Driver Input Voltages ...................... –0.5V to V
CC
+ 0.5V
Driver Output Voltages ............................................ ±14V
Control Input Currents .........................................±25mA
Driver Input Currents ...........................................±25mA
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
(Note 1)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
DI1
DO1A
DO1B
EN12
DO2B
DO2A
DI2
GND
DI3
DO3A
DO3B
EN34
DO4B
DO4A
DI4
V
N PACKAGE
16-LEAD PLASTIC DIP
TOP VIEW
CC
SW PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 125°C, θ
JA
= 70°C/W (N)
T
JMAX
= 150°C, θ
JA
= 95°C/W (S)
Consult factory for Military grade parts.
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC487CN#PBF LTC487CN#TRPBF LTC487CN 16-Lead Plastic DIP 0°C to 70°C
LTC487CSW#PBF LTC487CSW#TRPBF LTC487CSW 16-Lead Plastic SO 0°C to 70°C
LTC487IN#PBF LTC487IN#TRPBF LTC487IN 16-Lead Plastic DIP –40°C to 85°C
LTC487ISW#PBF LTC487IS#TRPBF LTC487ISW 16-Lead Plastic SO –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC487
3
487fc
Dc elecTrical characTerisTics
V
CC
= 5V ±5%, 0°C ≤ T
A
≤ 70°C (Commercial), –40°C ≤ T
A
≤ 85°C
(Industrial) (Notes 2, 3)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0 5 V
V
OD2
Differential Driver Output Voltage (With Load) R = 50Ω; (RS422)
2 V
R = 27Ω; (RS485) (Figure 3)
1.5 5 V
V
OD
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output States
R = 27Ω or R = 50Ω
(Figure 3)
0.2 V
V
OC
Driver Common Mode Output Voltage 3 V
V
OC
Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output States
0.2 V
V
IH
Input High Voltage DI, EN12, EN34 2.0 V
V
IL
Input Low Voltage 0.8 V
I
IN1
Input Current ±2 µA
I
CC
Supply Current No Load Output Enabled 110 200 µA
Output Enabled 110 200 µA
I
OSD1
Driver Short-Circuit Current, V
OUT
= High V
O
= –7V 100 250 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= Low V
O
= 12V 100 250 mA
I
OZ
High Impedance State Output Current V
O
= –7V to 12V ±10 ±200 µA
swiTching characTerisTics
V
CC
= 5V ± 5%, 0°C ≤ T
A
≤ 70°C (Notes 2, 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PLH
Driver Input to Output R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
10 30 50 ns
t
PHL
Driver Input to Output (Figures 1, 4)
10 30 50 ns
t
SKEW
Driver Output to Output
5 15 ns
t
r,
t
f
Driver Rise or Fall Time
5 20 25 ns
t
ZH
Driver Enable to Output High C
L
= 100pF (Figures 2, 5) S2 Closed
35 70 ns
t
ZL
Driver Enable to Output Low C
L
= 100pF (Figures 2, 5) S1 Closed 35 70 ns
t
LZ
Driver Disable Time from Low C
L
= 15pF (Figures 2, 5) S1 Closed
35 70 ns
t
HZ
Driver Disable Time from High C
L
= 15pF (Figures 2, 5) S2 Closed
35 70 ns
Note 2: All currents into device pins are positive; all currents out of
device pins are negative. All voltages are referenced to device GND unless
otherwise specified.
Note 3: All typicals are given for V
CC
= 5V and Temperature = 25°C.
P1-P3P4-P6P7-P9P10-P12

LTC487ISW#PBF

Mfr. #:
Buy LTC487ISW#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC 4x L Pwr RS485 Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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