LT490 Datasheet PDF - Linear Technology

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LT490
Linear Technology

Part Number LT490
Description Differential Driver and Receiver Pair
Page 8 Pages


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FEATURES
s Low Power: ICC = 300µA Typical
s Designed for RS485 or RS422 Applications
s Single 5V Supply
s – 7V to 12V Bus Common-Mode Range
Permits ±7V Ground Difference Between Devices
on the Bus
s Thermal Shutdown Protection
s Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Package
s Driver Maintains High Impedance with the
Power Off
s Combined Impedance of a Driver Output and
Receiver Allows up to 32 Transceivers on the Bus
s 70mV Typical Input Hysteresis
s 28ns Typical Driver Propagation Delays with
5ns Skew
s Pin Compatible with the SN75179
APPLICATI S
s Low Power RS485/RS422 Transceiver
s Level Translator
LTC490
Differential Driver and
Receiver Pair
DESCRIPTIO
The LTC490 is a low power differential bus/line transceiver
designed for multipoint data transmission standard RS485
applications with extended common-mode range (12V to
–7V). It also meets the requirements of RS422.
The CMOS design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload or ESD damage.
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.
Both AC and DC specifications are guaranteed from 0°C to
70°C and 4.75V to 5.25V supply voltage range.
TYPICAL APPLICATI
LTC490
3
D
DRIVER
2
R
RECEIVER
5
120
6
4000 FT BELDEN 9841
120
8
120
7
120
4000 FT BELDEN 9841
LTC490
RECEIVER
R
DRIVER
D
LTC490 • TA01
1



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LTC490
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ............................................... 12V
Driver Input Currents ........................... – 25mA to 25mA
Driver Input Voltages ....................... –0.5V to VCC +0.5V
Driver Output Voltages .......................................... ±14V
Receiver Input Voltages ......................................... ±14V
Receiver Output Voltages ................ –0.5V to VCC +0.5V
Operating Temperature Range
LTC490C................................................. 0°C to 70°C
LTC490I............................................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER I FOR ATIO
VCC 1
R2
D3
GND 4
TOP VIEW
R
D
8A
7B
6Z
5Y
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
TJMAX = 125°C, θJA = 100°C/ W (N8)
TJMAX = 150°C, θJA = 150°C/ W (S8)
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC490CN8
LTC490CS8
LTC490IN8
LTC490IS8
S8 PART MARKING
490
490I
DC ELECTRICAL CHARACTERISTICS
VCC = 5V ±5%
SYMBOL PARAMETER
CONDITIONS
VOD1 Differential Driver Output Voltage (Unloaded)
VOD2 Differential Driver Output Voltage (with Load)
IO = 0
R = 50(RS422)
R = 27(RS485) (Figure 1)
VOD
Change in Magnitude of Driver Differential Output
Voltage for Complementary Output States
R = 27or R = 50(Figure 1)
VOC
∆ VOC
Driver Common-Mode Output Voltage
Change in Magnitude of Driver Common Mode
Output Voltage for Complementary Output States
R = 27or R = 50(Figure 1)
R = 27or R = 50(Figure 1)
VIH
VIL
lIN1
lIN2
VTH
VTH
VOH
VOL
IOZR
ICC
RIN
IOSD1
IOSD2
IOSR
IOZ
Input High Voltage (D)
Input Low Voltage (D)
Input Current (D)
Input Current (A, B)
Differential Input Threshold Voltage for Receiver
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State Output Current at Receiver
Supply Current
Receiver Input Resistance
Driver Short-Circuit Current, VOUT = High
Driver Short-Circuit Current, VOUT = Low
Receiver Short-Circuit Current
Driver Three-State Output Current
VCC = 0V or 5.25V VIN = 12V
VIN = – 7V
– 7V VCM 12V
VCM = 0V
IO = –4mA, VID = 0.2V
IO = 4mA, VID = – 0.2V
VCC = Max 0.4V VO 2.4V
No Load; D = GND or VCC
– 7V VO 12V
VO = – 7V
VO = 12V
0V VO VCC
VO = – 7V to 12V
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN TYP MAX
5
2
1.5 5
0.2
3
0.2
2.0
0.8
±2
1
– 0.8
– 0.2 0.2
70
3.5
0.4
±1
300 500
12
100 250
100 250
7 85
±2 ±200
UNITS
V
V
V
V
V
V
V
V
µA
mA
mA
V
mV
V
V
µA
µA
k
mA
mA
mA
µA
2



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LTC490
SWITCHI G CHARACTERISTICS
VCC = 5V ±5%
SYMBOL
tPLH
tPHL
tSKEW
tr, tf
tPLH
tPHL
tSKD
PARAMETER
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Receiver Input to Output
Receiver Input to Output
tPLH – tPHLDifferential Receiver Skew
CONDITIONS
MIN TYP MAX
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 3) q 10 30 50
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 3) q 10 30 50
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 3) q
5
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 3) q
5
5 25
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 4) q 40 70 150
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 4) q 40 70 150
RDIFF = 54, CL1 = CL2 = 100pF (Figures 2, 4) q
13
UNITS
ns
ns
ns
ns
ns
ns
ns
The q 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.
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 VCC = 5V and Temperature = 25°C.
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output High Voltage vs
Output Current
–96 TA = 25°C
Driver Differential Output Voltage
vs Output Current
64 TA = 25°C
Driver Output Low Voltage vs
Output Current
80 TA = 25°C
–72 48 60
– 48 32 40
–24 16 20
0
01 23 4
OUTPUT VOLTAGE (V)
LTC490 • TPC01
TTL Input Threshold vs
Temperature
1.63
0
01 23 4
OUTPUT VOLTAGE (V)
LTC490 • TPC02
Driver Skew vs Temperature
5
0
01 23 4
OUTPUT VOLTAGE (V)
LTC490 • TPC03
Supply Current vs Temperature
350
1.61 4 340
1.59 3 330
1.57 2 320
1.55
–50
0 50 100
TEMPERATURE (°C )
LTC490 • TPC04
1
–50
0 50 100
TEMPERATURE (°C )
LTC490 • TPC05
310
–50
0 50 100
TEMPERATURE (°C )
LTC490 • TPC06
3



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LTC490
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Differential Output Voltage
vs Temperature
RO = 54
2.3
2.1
1.9
1.7
1.5
–50
0 50 100
TEMPERATURE (°C )
LTC490 • TPC07
Receiver tPLH-tPHLvs
Temperature
7
6
5
4
3
–50
0 50 100
TEMPERATURE (°C )
LTC490 • TPC08
Receiver Output Low Voltage vs
Temperature
I = 8mA
0.8
0.6
0.4
0.2
0
–50
0 50 100
TEMPERATURE (°C )
LTC490 • TPC09
PI FU CTI S
VCC (Pin 1): Positive Supply; 4.75V VCC 5.25V.
R (Pin 2): Receiver Output. If A > B by 200mV, R will be
high. If A < B by 200mV, then R will be low.
D (Pin 3): Driver Input. A low on D forces the driver outputs
A low and B high. A high on D will force A high and B low.
GND (Pin 4): Ground Connection.
Y (Pin 5): Driver Output.
Z (Pin 6): Driver Output.
B (Pin 7): Receiver Input.
A (Pin 8): Receiver Input.
TEST CIRCUITS
Y
VOD2
Z
R
R VOC
LTC490 • TA02
Figure 1. Driver DC Test Load
Y
D
DRIVER
RDIFF
Z
CL1 A
RECEIVER
CL2 B
R
15pF
LTC490 • TA03
Figure 2. Driver/Receiver Timing Test Circuit
4



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