SP1490E Datasheet, PDF (2/8 Pages) Sipex Corporation – 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
ELECTRICAL CHARACTERISTICS
T_MIN to T_MAX and V_CC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN. TYP.
MAX. UNITS CONDITIONS
SP1490E/1491E driver
DC Characteristics
Differential Output Voltage
3.5
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
figure 1
1.5
V_CC Volts With Load; R = 27Ω; (RS485); see
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
SP1490E/1491E driver
AC Characteristics
Maximum Data Rate
20 Mbps
Driver Input to Output
30
40 ns

Driver Input to Output
30
40 ns

Driver Skew
5 ns

Driver Rise or Fall Time
8
20
ns
SP1491E only

Driver Enable to Output High
20
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

t_R/F; R_DIFF = 54Ω, C_L1 = C_L2 = 100pF;
see figures 3 and 6
t_R/F; R_DIFF = 54Ω, C_L1 = C_L2 = 100pF;
see figures 3 and 6
see figures 3 and 6,
t_R/F = | t_PLH - t_PHL |
From 10% to 90%; R_DIFF = 54Ω,
C_L1 = C_L2 = 100pF; see figures 3 and 6
t_R/F
C_L1 = C_L2 = 100pF; see figures
4 and 7; S₂ closed
C_L1 = C_L2 = 100pF; see figures
4 and 7; S₁ closed
C_L1 = C_L2 = 100pF; see figures
4 and 7; S₁ closed
C_L1 = C_L2 = 100pF; see figures
4 and 7; S₂ closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP1490_SP1491E_100_061209