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Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP483_485_0_0627
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.
V
CC.......................................................................+7V
Input Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers......................-0.3V to (Vcc + 0.5V)
Receivers.........................................+/-5V
ELECTRICAL CHARACTERISTICS
T
MIN to TMAX and VCC = 5V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS CONDITIONS
SP483/SP485 DRIVER
DC Characteristics
Differential Output Voltage
Vcc
Volts
Unloaded; R = ∞ ; see figure 1
Differential Output Voltage
2
Vcc
Volts
With Load; R = 50 (RS-422);
see figure
Differential Output Voltage
.5
Vcc
Volts
With Load; R = 27 (RS-485);
see figure
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary states
0.2
Volts
R = 27 or R = 50; see figure 1
Driver Common Mode Output
Voltage
3
Volts
R = 27 or R = 50; 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
+/-0
A
Applies to DE, DI, RE
Driver Short Circuit Current,
V
OUT = HIGH
250
mA
-7V ≤ V
O ≤ +12V
Driver Short Circuit Current,
V
OUT = LOW
250
mA
-7V ≤ V
O ≤ +12V
SP485 DRIVER
AC Characteristics
Maximum Data Rate
5
Mbps
RE = 5V, DE = 5V
Driver Input to Output, t
PLH
30
60
ns
Figures 3 and 5, R
DIFF = 54,
C
L = CL2 = 00pF
Driver Input to Output, t
PHL
30
60
ns
Figures 3 and 5, R
DIFF = 54,
C
L = CL2 = 00pF
Driver Skew
5
0
ns
Figures 3 and 5,
t
SKEW = |tDPHL - tDPLH|
Driver Rise or Fall Time
5
40
ns
From 0%-90%; R
DIFF = 54
C
L = CL2 = 100pF; see figures 3
and 5
Output Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers.............................................+/-5V
Receivers..................-0.3V to (Vcc + 0.5V)
Storage Temperature.......................-65C to +150C
Power Dissipation
8-pin NSOIC...................................................500mW