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PDF SP491 Data sheet ( Hoja de datos )
| Número de pieza | SP491 | |
| Descripción | Full Duplex RS-485 Transceivers | |
| Fabricantes | Exar | |
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SP490/491
Full Duplex RS-485 Transceivers
FEATURES
• +5V Only
• Low Power BiCMOS
• Driver/Receiver Enable (SP491)
• RS-485 and RS-422 Drivers/Receivers
• Pin Compatible with LTC490 and
SN75179 (SP490)
• Pin Compatible with LTC491 and
SN75180 (SP491)
Now Available in Lead Free Packaging
DESCRIPTION
The SP490 is a low power differential line driver/receiver meeting RS-485 and RS-422
standards up to 5Mbps. The SP491 is identical to the SP490 with the addition of driver and
receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity, over
wide common mode range. The SP490 is available in 8-pin plastic DIP and 8-pin NSOIC
packages for operation over the commercial and industrial temperature ranges. The SP491
is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial
and industrial temperature ranges.
BLOCK DIAGRAMS
SP490 SP491
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
SP490,491_101_062711
1 page  
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.
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
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.
PARAMETERS
MIN.
SP491 DRIVER
TYP.
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
DC Characteristics
Differential Output Voltage GND
VCC Volts
D ifferential O utput Voltag e 2 VCC Volts
Differential Output Voltage 1.5
figure 1
VCC Volts
Unloaded; R = ∞ ; see figure 1
With Load; R = 50Ω; (RS422);
see figure 1
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, REB, DE
Input Low Voltage
0.8 Volts Applies to D, REB, DE
Input Current
±10 µA
Applies to D, REB, DE
Driver Short-Circuit Current
VOUT = HIGH
VOUT = LOW
250 mA ‑7V ≤ VO ≤ 12V
250 mA ‑7V ≤ VO ≤ 12V
SP491 DRIVER
AC Characteristics
Maximum Data Rate
5 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
REB = 5V, DE = 5V
tsPeLHe; fRigDuIFrFe=s 534aΩn,dC6L1 = CL2 = 100pF;
tsPeHeL; fRigDuIFrFe=s 534aΩn,dC6L1 = CL2 = 100pF;
see figures 3 and 6,
tSKEW = | tDPLH - tDPHL |
From 10% to 90%;
CL1 = CL2 = 100pF;
C4 La1n=dC7L;2S=2
100pF;
closed
C4 La1n=dC7L;2S=1
100pF;
closed
C4 La1n=dC7L;2S=1
100pF;
closed
C4 La1n=dC7L;2S=2
100pF;
closed
sReDeIFFfig=u5r4eΩs ,3
see figures
see figures
see figures
see figures
and
6
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
SP490,491_101_062711
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP491.PDF ] | |
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