SP491EEP-L Datasheet, PDF (5/12 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
Logic.................................................-0.5V to (V_CC+0.5V)
Drivers..............................................-0.5V to (V_CC+0.5V)
Receivers................................................................±14V
Output Voltages
Logic................................................-0.5V to (V_CC+0.5V)
Drivers....................................................................±14V
Receivers.........................................-0.5V to (V_CC+0.5V)
Storage Temperature.....................................................-65˚C to +150
Power Dissipation.................................................................1000mW
T_MIN to T_MAX and V_CC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
SP491E DRIVER
TYP.
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
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
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, RE, DE
Input Low Voltage
0.8 Volts Applies to D, RE, DE
Input Current
±10 µA
Applies to D, RE, DE
Driver Short-Circuit Current
V_OUT = HIGH
V_OUT = LOW
250 mA ‑7V ≤ V_O ≤ 12V
250 mA ‑7V ≤ V_O ≤ 12V
SP491E 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 10 ns

Driver Rise or Fall Time 15
40 ns

Driver Enable to Output High
40
70 ns

Driver Enable to Output Low
40
70 ns

Driver Disable Time from Low
40
70 ns

Driver Disable Time from High
40
70 ns

RE = 5V, DE = 5V
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
C_L1 = C_L2 = 100pF; see figures
4 and 6; S₂ closed
C_L1 = C_L2 = 100pF; see figures
4 and 6; S₁ closed
C_L1 = C_L2 = 100pF; see figures
4 and 6; S₁ closed
C_L1 = C_L2 = 100pF; see figures
4 and 6; S₂ closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • www.exar.com

SP490E,491E_101_052413