ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at
theseratingsoranyotherabovethoseindicatedintheoperationsections
ofthespecificationsbelowisnotimplied. Exposuretoabsolutemaximum
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
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX. UNITS CONDITIONS
SP1490E/1491E DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
3.5
2
VCC
VCC
Volts
Volts
Unloaded; R = ∞ ; see figure 1
With Load; R = 50Ω; (RS422);
see figure 1
Differential Output Voltage
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary States
Driver Common-Mode
Output Voltage
Input High Voltage
Input Low Voltage
Input Current
1.5
VCC
Volts
Volts
With Load;R = 27Ω; (RS485);see figure 1
0.2
3
R = 27Ω or R = 50Ω; see figure 1
Volts
Volts
Volts
µA
R = 27Ω or R = 50Ω; see figure 1
Applies to D
Applies to D
2.0
0.8
±10
Applies to D
Driver Short-Circuit Current
VOUT = HIGH
VOUT = LOW
±250 mA
±250 mA
-7V ≤ VO ≤ +12V
-7V ≤ VO ≤ +12V
SP1490E/1491E DRIVER
AC Characteristics
Maximum Data Rate
Driver Input to Output
20
Mbps
ns
30
30
40
40
5
tR/F; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 and 6
tR/F; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see figures 3 and 6
Driver Input to Output
Driver Skew
ns
ns
see figures 3 and 6,
tR/F = | tDPLH - tDPHL
|
Driver Rise or Fall Time
SP1491E only
8
20
ns
From 10% to 90%; RDIFF = 54Ω,
CL1 = CL2 = 100pF; see figures 3 and 6
tR/F
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
20
40
40
40
70
70
70
70
ns
ns
ns
ns
CL1 = CL2 = 100pF; see figures
4 and 7; S2 closed
CL1 = CL2 = 100pF; see figures
4 and 7; S1 closed
CL1 = CL2 = 100pF; see figures
4 and 7; S1 closed
CL1 = CL2 = 100pF; see figures
4 and 7; S2 closed
Date: 5/18/04
SP1490E/1491E Full Duplex RS-485 Transceivers
© Copyright 2004 Sipex Corporation
2
SIPEX [ SIPEX CORPORATION ]
