SP491ECN-L Datasheet, PDF (2/12 Pages) Exar Corporation – Enhanced Full Duplex RS-485 Transceivers

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
T_MIN to T_MAXand V_CC = 5V ± 5% unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX.UNITSCONDITIONS
SP490E DRIVER
DC Characteristics
Differential Output Voltage
GND
V_CC Volts
Differential Output Voltage
2
V_CC Volts

Unloaded; R = ∞ ; see figure 1
With Load; R = 50Ω; (RS422);
see figure 1
Differential Output Voltage 1.5
V_CC Volts
With Load; R = 27Ω; (RS485);
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
V_OUT = LOW
250 mA ‑7V ≤ V_O ≤ +12V
250 mA ‑7V ≤ V_O ≤ +12V
SP490E DRIVER
AC Characteristics
Maximum Data Rate 10 Mbps
Driver Input to Output
30
60 ns

Driver Input to Output
30
60 ns

Driver Skew
5 ns

Driver Rise or Fall Time 15
40 ns

t_PLH; R_DIFF = 54Ω, C_L1 = C_L2 = 100pF;
see figures 3 and 5
t_PHL; R_DIFF = 54Ω, C_L1 = C_L2 = 100pF;
see figures 3 and 5
see figures 3 and 5,
t_SKEW = | t_DPLH - t_DPHL |
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
Input Hysteresis
70
Output Voltage High
3.5
Output Voltage Low
0.4
Input Resistance
12
15
Input Current (A, B); V_IN = 12V
±1.0
Input Current (A, B); V_IN = -7V
-0.8
Short-Circuit Current
85
Volts ‑7V ≤ V_CM ≤ 12V
mV
V_CM = 0V
Volts
I_O = ‑4mA, V_ID = +200mV
Volts
I_O = +4mA, V_ID = ‑200mV
kΩ ‑7V ≤ V_CM ≤ 12V
mA
V_IN = 12V
mA
V_IN = -7V
mA
0V ≤ V_O ≤ V_CC
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • www.exar.com

SP490E,491E_101_052413