SP483E Datasheet PDF - Exar

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SP483E
Exar

Part Number SP483E
Description Enhanced Low EMI Half-Duplex RS-485 Transceiver
Page 12 Pages


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SP483E
Enhanced Low EMI Half-Duplex
RS-485 Transceiver
• +5V Only
• Low Power BiCMOS
• Driver / Receiver Enable for Multi-Drop
Configurations
• Enhanced ESD Specifications:
+/-15kV Human Body Model
+/-15kV IEC61000-4-2 Air Discharge
+/-8kV IEC61000-4-2 Contact Discharge
• Low EMI Transceiver limited to 250kbps
• Low Power 1µA Shutdown Mode
DESCRIPTION
The SP483E is a half-duplex transceiver that meets the specifications of RS-485 and RS-422
serial protocols with enhanced ESD performance. The ESD tolerance has been improved on
these devices to over +15kV for both Human Body Model and IEC61000-4-2 Air Discharge
Method. This devices is pin-to-pin compatible with Exar's SP483 device as well as popular
industry standards. As with the original versions, the SP483E feature Exar's BiCMOS de-
sign allowing low power operation without sacrificing performance. The SP483E is internally
slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to
250kbps. The SP483E is also equipped with a low power shutdown mode.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
VCC.......................................................................+7V
Input Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers......................-0.3V to (Vcc + 0.5V)
Receivers.........................................+/-15V
Output Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers.............................................+/-15V
Receivers..................-0.3V to (Vcc + 0.5V)
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation..........................................500mW
TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
PARAMETERS
MIN. TYP.
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
SP483E DRIVER
DC Characteristics
Differential Output Voltage
GND
Vcc Volts Unloaded; R = ∞ ; See Figure 1
Differential Output Voltage
2
Vcc Volts With Load; R = 50Ω (RS-422);
See Figure 1
Differential Output Voltage
1.5
Vcc Volts With Load; R = 27Ω (RS-485);
See Figure 1
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary states
0.2 Volts R = 27Ω or R = 50Ω; See Figure 1
Driver Common Mode Output
Voltage
3 Volts R = 27Ω or R = 50Ω; See Figure 1
Input High Voltage
2.0
Volts Applies to DE, DI, RE
Input Low Voltage
0.8 Volts Applies to DE, DI, RE
Input Current, Driver Input
10 µA Applies to DI
Input Current, Control Lines
1 µA Applies to DE, RE
Driver Short Circuit Current
VOUT = HIGH
VOUT = LOW
SP483E DRIVER
+/-250
+/-250
mA -7V ≤ VO ≤ +12V
mA -7V ≤ VO ≤ +12V
AC Characteristics
Max. Transmission Rate
Driver Input to Output, tPLH
Driver Input to Output, tPHL
Driver Skew
Driver Rise or Fall Time
250 kbps RE = 5V, DE = 5V; RDIFF = 54Ω,
CL1 = CL2 = 100pF
250 800 2000
ns See Figures 3 & 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
250 800 2000
ns See Figures 3 & 5, RDIFF = 54Ω,
CL1 = CL2 = 100pF
100 800
ns See Figures 3 and 5,
tSKEW = |tDPHL - tDPLH|
250
2000
ns From 10%-90%; RDIFF = 54Ω
CL1 = CL2 = 100pF;
See Figures 3 and 6
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
PARAMETERS
MIN.
SP483E DRIVER (continued)
AC Characteristics
Driver Enable to Output High
250
TYP.
Driver Enable to Output Low
250
Driver Disable Time from High
300
Driver Disable Time from Low
300
SP483E RECEIVER
DC Characteristics
Differential Input Threshold
Input Hysteresis
Output Voltage High
Output Voltage Low
Three-State ( High Impedance)
Output Current
Input Resistance
Input Current (A, B); VIN = 12V
Input Current (A, B); VIN = -7V
Short Circuit Current
SP483E RECEIVER
AC Characteristics
Max. Transmission Rate
Receiver Input to Output
-0.2
3.5
12
7
250
250
20
15
Receiver Input to Output
250
Differential Receiver Skew
|tPHL - tPLH|
Receiver Enable to Output Low
100
45
Receiver Enable to Output High
45
Receiver Disable from LOW
45
Receiver Disable from High
45
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
2000
2000
3000
3000
ns CL = 100pF, See Figures 4 and 6,
S2 closed
ns CL = 100pF, See Figures 4 and 6,
S1 closed
ns CL = 15pF, See Figures 4 and 6,
S2 closed
ns CL = 15pF, See Figures 4 and 6,
S1 closed
+0.2
0.4
+/-1
+1.0
-0.8
95
Volts
mV
Volts
Volts
µA
-7V ≤ VCM ≤ +12V
VCM = 0V
IO = -4mA, VID = +200mV
IO = +4mA, VID = +200mV
0.4V ≤ VO ≤ 2.4V; RE = 5V
kΩ -7V ≤ VCM ≤ +12V
mA DE = 0V, VCC = 0V or 5.25V,
VIN = 12V
mA DE = 0V, VCC = 0V or 5.25V,
VIN = -7V
mA 0V ≤ VO ≤ VCC
2000
2000
70
70
70
70
kbps
ns
ns
ns
ns
ns
ns
ns
RE = 0V, DE = 0V
tPLH ; See Figures 3 & 7,
RDIFF = 54Ω, CL1 = CL2 = 100pF
tPHL ; See Figures 3 & 7,
RDIFF = 54Ω, CL1 = CL2 = 100pF
RDIFF = 54Ω, CL1 = CL2 = 100pF,
See Figures 3 and 7
CRL = 15pF, Figures 2 & 8;
S1 Closed
CRL = 15pF, Figures 2 & 8;
S2 Closed
CRL = 15pF, Figures 2 & 8;
S1 Closed
CRL = 15pF, Figures 2 & 8;
S2 Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted.
PARAMETERS
MIN. TYP.
SP483E
Shutdown Timing
Time to Shutdown
50 200
Driver Enable from Shutdown
to Output High
Driver Enable from Shutdown
to Output Low
Receiver Enable from
Shutdown to Output High
300
Receiver Enable from
Shutdown to Output Low
300
POWER REQUIREMENTS
Supply Voltage VCC
Supply Current
+4.75
No Load
900
600
Shutdown Mode
1
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
Commercial (_C_)
0
Industrial (_E_)
-40
Storage Temperature
-65
Package
Plastic DIP (_P)
NSOIC (_N)
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
600
2000
2000
2500
2500
ns RE = 5V, DE = 0V
ns CL = 100pF; See Figures 4 and 6;
S2 Closed
ns CL = 100pF; See Figures 4 and 6;
S1 Closed
ns CL = 15pF; See Figures 2 and 8; S2
Closed
ns CL = 15pF; See Figures 2 and 8; S1
Closed
+5.25 Volts
µA RE, DI = 0V or VCC; DE = VCC
µA RE = 0V, DI = 0V or 5V; DE = 0V
10 µA DE = 0V, RE = VCC
70
+85
+150
ºC
ºC
ºC
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP483E_100_020912



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