SP490EDS/14 SP490E Enhanced Full Duplex RS-485 Transceivers © Copyright 2000 Sipex Corporation
2
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
Drivers................................................-0.5V to (V
CC
+0.5V)
Receivers..................................................................±14V
Output Voltages
Drivers......................................................................±14V
Receivers...........................................-0.5V to (V
CC
+0.5V)
Storage Temperature....................................................-65˚C to +150˚
Power Dissipation.....................................................................1000mW
SPECIFICATIONS
T
MIN
to T
MAX
and V
CC
= 5V ± 5% unless otherwise noted.
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP490E DRIVER
DC Characteristics
Differential Output Voltage GND V
CC
Volts Unloaded; R = ∞;
see Figure 1
Differential Output Voltage 2 V
CC
Volts With Load; R = 50Ω; (RS-422);
see Figure 1
Differential Output Voltage 1.5 V
CC
Volts W
ith 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 D
Input Low Voltage 0.8 Volts Applies to D
Input Current ±10 µA Applies to D
Driver Short-Circuit Current
V
OUT
= HIGH ±250 mA -7V ≤ V
O
≤ +12V
V
OUT
= LOW ±250 mA -7V ≤ V
O
≤ +12V
SP490E DRIVER
AC Characteristics
Maximum Data Rate 10 Mbps R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
Driver Input to Output 20 30 60 ns t
PLH
; R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
see Figures 3 and 6
Driver Input to Output 20 30 60 ns t
PHL
; R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
see Figures 3 and 5
Driver Skew 5 ns
see Figures 3 and 5,
t
SKEW
= | t
DPLH
- t
DPHL
|
Driver Rise or Fall Time 3 15 40 ns From 10% to 90%; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF;
see Figures 3 and 5
SP490E
RECEIVER
DC Characteristics
Differential Input Threshold -0.2 +0.2 Volts -7V ≤ V
CM
≤ 12V
Input Hysteresis 70 mV V
CM
= 0V
Output Voltage High 3.5 Volts I
O
= -4mA, V
ID
= +200mV
Output Voltage Low 0.4 Volts I
O
= +4mA, V
ID
= -200mV
Input Resistance 12 15 kΩ -7V ≤ V
CM
≤ 12V
Input Current (A, B); V
IN
= 12V ±1.0 mA V
IN
= 12V
Input Current (A, B); V
IN
= -7V -0.8 mA V
IN
= -7V
Short-Circuit Current 85 mA 0V ≤ V
O
≤ V
CC
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