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SP490 Datasheet PDF : 12 Pages
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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
Drivers................................................-0.5V to (VCC+0.5V)
Receivers..................................................................±14V
Output Voltages
Drivers......................................................................±14V
Receivers...........................................-0.5V to (VCC+0.5V)
Storage Temperature....................................................-65˚C to +150˚
Power Dissipation.....................................................................1000mW
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
SP490 DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
GND
2
TYP.
Differential Output Voltage
1.5
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary States
Driver Common-Mode
Output Voltage
Input High Voltage
2.0
Input Low Voltage
Input Current
Driver Short-Circuit Current
VOUT = HIGH
35
VOUT = LOW
35
SP490 DRIVER
AC Characteristics
Maximum Data Rate
Driver Input to Output
5
30
Driver Input to Output
30
Driver Skew
5
Driver Rise or Fall Time
15
SP490 RECEIVER
DC Characteristics
Differential Input Threshold
0.2
Input Hysteresis
70
Output Voltage High
3.5
Output Voltage Low
Input Resistance
12
15
Input Current (A, B); VIN = 12V
Input Current (A, B); VIN = -7V
Short-Circuit Current
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
VCC Volts
VCC Volts
VCC Volts
Unloaded; R = ∞ ; see figure 1
With Load; R = 50Ω; (RS422);
see figure 1
With Load; R = 27Ω; (RS485); see figure 1
0.2 Volts
3 Volts
Volts
0.8 Volts
±10 µA
250 mA
250 mA
R = 27Ω or R = 50Ω; see figure 1
R = 27Ω or R = 50Ω; see figure 1
Applies to D
Applies to D
Applies to D
-7V ≤ VO ≤ +12V
-7V ≤ VO ≤ +12V
Mbps
60 ns
60 ns
ns
40 ns
tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 and 6
tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 and 6
see figures 3 and 6,
tSKEW = | tDPLH - tDPHL |
From 10% to 90%; RDIFF = 54Ω,
CL1 = CL2 = 100pF; see figures 3 and 6
+0.2 Volts
mV
Volts
0.4 Volts
kΩ
±1.0 mA
-0.8 mA
85 mA
-7V ≤ VCM ≤ 12V
VCM = 0V
IO = -4mA, VID = +200mV
IO = +4mA, VID = -200mV
-7V ≤ VCM ≤ 12V
VIN = 12V
VIN = -7V
0V ≤ VO ≤ VCC
Date: 02/24/05
SP490/491 Full Duplex RS-485 Transceivers
2
© Copyright 2005 Sipex Corporation
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