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MAX1490BEPG Integrated Circuit IC Chip 1/1 Transceiver Full RS422, RS485 24-PDIP

Categories Integrated Circuit IC Chip
Model Number: MAX1490BEPG
Type: Transceiver
Protocol: RS422, RS485
Number of Drivers/Receivers: 1/1
Duplex: Full
Receiver Hysteresis: 70mV
Data Rate: 250kbps
Voltage - Supply: 4.5 V ~ 5.5 V
Operating Temperature: 0°C ~ 70°C
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    MAX1490BEPG Integrated Circuit IC Chip 1/1 Transceiver Full RS422, RS485 24-PDIP


    MAX1490BEPG Integrated Circuit IC Chip 1/1 Transceiver Full RS422, RS485 24-PDIP


    Type

    Transceiver


    Protocol

    RS422, RS485


    Number of Drivers/Receivers

    1/1


    Duplex

    Full


    Receiver Hysteresis

    70mV


    Data Rate

    250kbps


    Voltage - Supply

    4.5 V ~ 5.5 V


    Operating Temperature

    0°C ~ 70°C


    Mounting Type

    Through Hole


    Package / Case

    24-DIP (0.600", 15.24mm)


    Supplier Device Package

    24-PDIP


    Base Part Number

    MAX1490


    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/Bare available in a 24-pin DIP package.

    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.


    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

    Selection Table


    PART

    HALF/ FULL DUPLEX

    DATA RATE (MBPS)

    SLEW- RATE LIMITED

    DRIVER ENABLE TIME

    (µs)

    MAX1480A

    Half

    2.5

    No

    0.2

    MAX1480B

    Half

    0.25

    Yes

    35

    MAX1480C

    Half

    0.25

    Yes

    0.5

    MAX1490A

    Full

    2.5

    No

    MAX1490B

    Full

    0.25

    Yes


    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

    SYMBOL

    CONDITIONS

    MIN TYP MAX

    UNITS

    Switch Frequency

    fSWL

    VFS = 0V

    535

    kHz

    fSWH

    FS = VCC_ or open

    725


    Operating Supply Current


    ICC

    MAX1480A,

    DE´ = VCC_ or open

    RL = ¥, +25°C only

    60 90


    mA

    RL = 54Ω

    120

    MAX1480B,

    DE´ = VCC_ or open

    RL = ¥, +25°C only

    35 45

    RL = 54Ω

    95

    MAX1480C,

    DE´ = VCC_ or open

    RL = ¥, +25°C only

    35 75

    RL = 54Ω

    95

    MAX1490A

    RL = ¥, +25°C only

    100 150

    RL = 54Ω

    170

    MAX1490B

    RL = ¥, +25°C only

    65 125

    RL = 54Ω

    130

    Shutdown Supply Current (Note 3)

    ISHDN

    SD = VCC_

    0.2

    µA

    Shutdown Input Threshold

    VSDH

    High

    2.4

    V

    VSDL

    Low

    0.8

    Shutdown Input Leakage Current



    10

    pA

    FS Input Threshold

    VFSH

    High

    2.4

    V

    VFSL

    Low

    0.8

    FS Input Pullup Current


    FS low

    50

    µA

    FS Input Leakage Current


    FS high

    10

    pA

    Input High Voltage

    VIH

    DE´, DI´

    VCC_ - 0.4

    V

    Input Low Voltage

    VIL

    DE´, DI´

    0.4

    V

    Isolation Resistance

    RISO

    TA = +25°C, VISO = 50VDC

    100 10,000

    Isolation Capacitance

    CISO

    TA = +25°C, VISO = 50VDC

    10

    pF

    Differential Driver Output (No Load)

    VOD1


    8

    V



    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)

    VOD2

    R = 50Ω (RS-422)

    2

    V

    R = 27Ω (RS-485), Figure 4

    1.5 5.0

    Change in Magnitude of

    Differential Output Voltage for Complementary Output States


    ΔVOD

    R = 27Ω or 50Ω,

    Figure 4

    Differential

    0.3


    V

    Common mode

    0.3

    Driver Common-Mode Output Voltage

    VOC

    R = 27Ω or 50Ω, Figure 4

    4

    V


    Input Current (A, B)


    ISO IIN


    DE´ = 0V, VCC_ = 0V

    or 5.5V

    VIN = 12V

    MAX1480A/B/C

    1


    mA

    MAX1490A/B

    0.25

    VIN = -7V

    MAX1480A/B/C

    0.8

    MAX1490A/B

    0.2

    Receiver Input Resistance

    RIN

    -7V £ VCM £ 12V

    MAX1480A/B/C

    48

    MAX1490A/B

    12

    Receiver Differential Threshold Voltage

    VTH

    -7V £ VCM £ 12V

    -0.2 +0.2

    V

    Receiver Input Hysteresis

    ΔVTH

    VCM = 0V

    70

    mV

    Receiver Output/Receiver Output Low Voltage

    VOL

    Using resistor values listed in Tables 1 and 2

    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

    UNITS

    Driver Input to Output Propagation Delay

    tPLH

    Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2

    = 100pF

    100

    275

    ns

    tPHL

    100

    275

    Driver Output Skew

    tSKEW

    Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2

    = 100pF

    25

    90

    ns

    Driver Rise or Fall Time

    tR, tF

    Figures 5 and 7, RDIFF = 54Ω, CL1 = CL2

    = 100pF

    15

    40

    ns

    Driver Enable to Output High (MAX1480A Only)

    tZH

    Figures 6 and 8, CL = 100pF, S2 closed

    0.2

    1.5

    µs

    Driver Enable to Output Low (MAX1480A Only)

    tZL

    Figures 6 and 8, CL = 100pF, S1 closed

    0.2

    1.5

    µs

    Driver Disable Time from Low (MAX1480A Only)

    tLZ

    Figures 6 and 8, CL = 15pF, S1 closed

    0.2

    1.5

    µs

    Driver Disable Time from High (MAX1480A Only)

    tHZ

    Figures 6 and 8, CL = 15pF, S2 closed

    0.2

    1.5

    µs

    Receiver Input to Output Propagation Delay

    tPLH

    Figures 5 and 10, RDIFF = 54Ω, CL1 = CL2

    = 100pF

    100

    225

    ns

    tPHL

    100

    225


    SWITCHING CHARACTERISTICS—MAX1480A/MAX1490A (continued)

    (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

    UNITS

    |tPLH - tPHL| Differential Receiver Skew

    tSKD

    Figures 5 and 10, RDIFF =

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