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MAX1490A Datasheet Download - Maxim

Номер произв MAX1490A
Описание Complete / Isolated RS-485/RS-422 Data Interface
Производители Maxim
логотип Maxim логотип 



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MAX1490A Даташит, Описание, Даташиты
19-0259; Rev 5; 5/05
Complete, Isolated RS-485/RS-422
Data Interface
_________________General Description
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B are complete, electrically isolated, RS-485/
RS-422 data-communications interface solutions in a
hybrid microcircuit. Transceivers, optocouplers, and a
transformer provide a complete interface in a standard
DIP package. A single +5V supply on the logic side pow-
ers both sides of the interface.
The MAX1480B/MAX1480C/MAX1490B feature reduced-
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission at data rates up to 250kbps.
The MAX1480A/MAX1490A driver slew rate is not limited,
allowing transmission rates up to 2.5Mbps. The
MAX1480A/B/C are designed for half-duplex communi-
cation, while the MAX1490A/B feature full-duplex com-
munication.
Drivers are short-circuit current limited and protected
against excessive power dissipation by thermal shut-
down circuitry that places the driver outputs into a high-
impedance state. The receiver input has a fail-safe
feature that guarantees a known output (RO low for the
MAX1480A/B/C, RO high for the MAX1490A/B) if the
input is open circuit.
The MAX1480A/MAX1480B/MAX1480C/MAX1490A/
MAX1490B typically withstand 1600VRMS (1 minute) or
2000VRMS (1 second). Their isolated outputs meet all
RS-485/RS-422 specifications. The MAX1480A/B/C are
available in a 28-pin DIP package, and the MAX1490A/B
are available in a 24-pin DIP package.
________________________Applications
Isolated RS-485/RS-422 Data Interface
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Automatic Test Equipment
HVAC/Building Control Networks
Next-Generation Device Features
For Integrated ESD Protection
MAX1480E/MAX1490E: ±15kV ESD-Protected,
Isolated RS-485/RS-422 Data Interfaces
For Space-Constrained Applications
MAX3157: High CMRR, RS-485 Transceiver with
±50V Isolation
_______________Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1480ACPI
0°C to +70°C
28 Wide Plastic DIP
MAX1480AEPI -40°C to +85°C
28 Wide Plastic DIP
Ordering Information continued at end of data sheet.
Data rate for “A” parts is up to 2.5Mbps. Data rate for “B” and
“C” parts is up to 250kbps.
_____________________Selection Table
PART
MAX1480A
MAX1480B
MAX1480C
MAX1490A
MAX1490B
HALF/
FULL
DUPLEX
Half
Half
Half
Full
Full
DATA
RATE
(MBPS)
2.5
0.25
0.25
2.5
0.25
SLEW-
RATE
LIMITED
No
Yes
Yes
No
Yes
DRIVER
ENABLE
TIME
(µs)
0.2
35
0.5
Pin Configurations
TOP VIEW
VCC1 1
VCC2 2
D1 3
D2 4
GND1 5
FS 6
SD 7
VCC3 8
DI 9
VCC4 10
RO 11
GND2 12
24 AC1 MAX1490A/B
23 AC2
22 ISO VCC1
21 ISO RO DRV
20 A
19 B
18 Z
17 Y
16 ISO COM1
15 ISO DI DRV
14 ISO VCC2
13 ISO RO LED
ISOLATION BARRIER
DIP
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.







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MAX1490A Даташит, Описание, Даташиты
Complete, Isolated RS-485/RS-422
Data Interface
ABSOLUTE MAXIMUM RATINGS
With Respect to GND_
Supply Voltage (VCC_)...........................................-0.3V to +6V
Control Input Voltage (SD, FS)...............-0.3V to (VCC_ + 0.3V)
Receiver Output Voltage (RO, RO)........-0.3V to (VCC_ + 0.3V)
Output Switch Voltage (D1, D2)........................................+12V
With Respect to ISO COM_
Control Input Voltage (ISO DE_ ) ....-0.3V to (ISO VCC_ + 0.3V)
Driver Input Voltage (ISO DI_ ) .......-0.3V to (ISO VCC_ + 0.3V)
Receiver Output Voltage (ISO RO_) ...-0.3V to (ISO VCC_ + 0.3V)
Driver Output Voltage (A, B, Y, Z ) ......................-8V to +12.5V
Receiver Input Voltage (A, B)..............................-8V to +12.5V
LED Forward Current (DI, DE, ISO RO LED) ......................50mA
Continuous Power Dissipation (TA = +70°C)
24-Pin Plastic DIP (derate 8.7mW°C above +70°C) .....696mW
28-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..727mW
Operating Temperature Ranges
MAX1480_CPI/MAX1490_CPG ............................0°C to +70°C
MAX1480_EPI/MAX1490_EPG .........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC_ = 5V ±10%, VFS = VCC_, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC_ = 5V and TA = +25°C.) (Notes 1, 2)
PARAMETER
Switch Frequency
Operating Supply Current
Shutdown Supply Current
(Note 3)
SYMBOL
fSWL
fSWH
ICC
CONDITIONS
VFS = 0V
FS = VCC_ or open
MAX1480A,
DE´ = VCC_ or open
MAX1480B,
DE´ = VCC_ or open
MAX1480C,
DE´ = VCC_ or open
MAX1490A
RL = , +25°C only
RL = 54Ω
RL = , +25°C only
RL = 54Ω
RL = , +25°C only
RL = 54Ω
RL = , +25°C only
RL = 54Ω
MAX1490B
RL = , +25°C only
RL = 54Ω
ISHDN SD = VCC_
MIN
TYP
535
725
60
120
35
95
35
95
100
170
65
130
0.2
MAX UNITS
kHz
90
45
75
mA
150
125
µA
Shutdown Input Threshold
Shutdown Input Leakage Current
FS Input Threshold
FS Input Pullup Current
FS Input Leakage Current
Input High Voltage
Input Low Voltage
Isolation Resistance
Isolation Capacitance
Differential Driver Output
(No Load)
VSDH
VSDL
High
Low
VFSH
VFSL
VIH
VIL
RISO
CISO
VOD1
High
Low
FS low
FS high
DE´, DI´
DE´, DI´
TA = +25°C, VISO = 50VDC
TA = +25°C, VISO = 50VDC
2.4
10
2.4
10
VCC_ - 0.4
100 10,000
10
0.8
0.8
50
0.4
8
V
pA
V
µA
pA
V
V
MΩ
pF
V
2 _______________________________________________________________________________________







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MAX1490A Даташит, Описание, Даташиты
Complete, Isolated RS-485/RS-422
Data Interface
ELECTRICAL CHARACTERISTICS (continued)
(VCC_ = 5V ±10%, VFS = VCC_, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC_ = 5V and TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Differential Driver Output
(With Load)
Change in Magnitude of
Differential Output Voltage for
Complementary Output States
VOD2
ΔVOD
R = 50Ω (RS-422)
R = 27Ω (RS-485), Figure 4
R = 27Ω or 50Ω,
Figure 4
Differential
Common mode
2
1.5
V
5.0
0.3
V
0.3
Driver Common-Mode Output
Voltage
VOC R = 27Ω or 50Ω, Figure 4
4V
Input Current (A, B)
ISO IIN
DE´ = 0V,
VCC_ = 0V
or 5.5V
VIN = 12V
VIN = -7V
MAX1480A/B/C
MAX1490A/B
MAX1480A/B/C
MAX1490A/B
1
0.25
mA
0.8
0.2
Receiver Input Resistance
RIN -7V VCM 12V
MAX1480A/B/C
MAX1490A/B
48
12
kΩ
Receiver Differential Threshold
Voltage
VTH -7V VCM 12V
-0.2
+0.2
V
Receiver Input Hysteresis
Receiver Output/Receiver Output
Low Voltage
ΔVTH
VOL
VCM = 0V
Using resistor values listed in
Tables 1 and 2
70 mV
0.4 V
Receiver Output/Receiver Output
High Current
IOH VOUT = 5.5V
250 µA
Driver Short-Circuit Current
ISO IOSD -7V VO 12V (Note 4)
100 mA
SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A
(VCC_ = 5V ±10%, FS = VCC_, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC_ = 5V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Driver Input to Output
Propagation Delay
tPLH
tPHL
Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2
= 100pF
100 275
100 275
Driver Output Skew
tSKEW
Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2
= 100pF
25 90
Driver Rise or Fall Time
tR, tF
Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2
= 100pF
15 40
Driver Enable to Output High
(MAX1480A Only)
tZH Figures 6 and 8, CL = 100pF, S2 closed
0.2 1.5
Driver Enable to Output Low
(MAX1480A Only)
tZL Figures 6 and 8, CL = 100pF, S1 closed
0.2 1.5
Driver Disable Time from Low
(MAX1480A Only)
tLZ Figures 6 and 8, CL = 15pF, S1 closed
0.2 1.5
Driver Disable Time from High
(MAX1480A Only)
tHZ Figures 6 and 8, CL = 15pF, S2 closed
0.2 1.5
Receiver Input to Output
Propagation Delay
tPLH
tPHL
Figures 5 and 10, RDIFF = 54Ω, CL1 = CL2
= 100pF
100 225
100 225
UNITS
ns
ns
ns
µs
µs
µs
µs
ns
_______________________________________________________________________________________ 3










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