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
Logic...................................................-0.5V to (VCC+0.5V)
Drivers................................................-0.5V to (VCC+0.5V)
Receivers..................................................................±14V
Output Voltages
Logic...................................................-0.5V to (VCC+0.5V)
Drivers......................................................................±14V
Receivers...........................................-0.5V to (VCC+0.5V)
Storage Temperature......................................................-65˚C to +150
Power Dissipation.....................................................................1000mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX. UNITS
CONDITIONS
SP491E DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
GND
2
VCC
VCC
Volts
Volts
Unloaded; R = ∞ ; see Figure 1
With Load; R = 50Ω; (RS-422);
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; (RS-485);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, REB, DE
Applies to D, REB, DE
2.0
0.8
±10
Applies to D, REB, DE
Driver Short-Circuit Current
VOUT = HIGH
VOUT = LOW
250
250
mA
mA
-7V ≤ VO ≤ 10V
-7V ≤ VO ≤ 10V
SP491E DRIVER
AC Characteristics
Maximum Data Rate
Driver Input to Output
10
20
Mbps
ns
RDIFF = 54Ω, CL1 = CL2 = 100pF
tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see Figures 3 and 5
tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;
see Figures 3 and 5
30
30
5
60
60
10
40
70
70
70
70
Driver Input to Output
20
ns
ns
ns
ns
ns
ns
ns
Driver Skew
see Figures 3 and 5,
tSKEW = | tDPLH - tDPHL
|
Driver Rise or Fall Time
Driver Enable to Output HIGH
Driver Enable to Output LOW
Driver Disable Time from LOW
Driver Disable Time from HIGH
3
15
40
40
40
40
From 10% to 90%; RDIFF = 54Ω,
CL1 = CL2 = 100pF; see Figures 3 and 5
CL1 = CL2 = 100pF; see Figures
4 and 6; S2 closed
CL1 = CL2 = 100pF; see Figures
4 and 6; S1 closed
CL1 = CL2 = 15pF; see Figures
4 and 6; S1 closed
CL1 = CL2 = 15pF; see Figures
4 and 6; S2 closed
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
© Copyright 2000 Sipex Corporation
5
SIPEX [ SIPEX CORPORATION ]
