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PDF SP3490 Data sheet ( Hoja de datos )
| Número de pieza | SP3490 | |
| Descripción | +3.3V Low Power Full-Duplex RS-485 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3490 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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SP3490/SP3491
+3.3V Low Power Full-Duplex RS-485
Transceivers with 10Mbps Data Rate
• Full-Duplex RS-485 and RS-422 Transceivers
• Operates from a single +3.3V Supply
• Interoperable with +5.0V logic
• Driver/Receiver Tri-state Enable Lines (SP3491)
• -7V to +12V Common-Mode Input Voltage Range
• +/-200mV Receiver Input Sensitivity
• Allows up to 32 transceivers on the serial bus
• Compatability with LTC490 and SN75179 (SP3490)
• Compatability with LTC491 and SN75180 (SP3491)
VCC 1
R2
8A
R 7B
D3
GND 4
D
6Z
5Y
SP3490
DESCRIPTION
The SP3490 and SP3491 devices are +3.3V low power full-duplex transceivers that meet
the specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin
compatible with the Exar SP490 and SP491 devices as well as popular industry standards.
The SP3490 and SP3491 feature Exar's BiCMOS process, allowing low power operation
without sacrificing performance. The SP3490 and SP3491 meet the electrical specifications
of the RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3491 is identical
to the SP3490 with the addition of driver and reciveiver tri-state enable lines.
NC 1
14
13
VCC
NC
R2
12 A
R 11 B
REB
DE
3
4
D5
6
GND
GND
7
D
10 Z
9Y
8 NC
SP3491
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3490_3491_102_102710
1 page  
TAMB = TMIN to TMAX and VCC = +3.3V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
SP3491 RECEIVER
DC Characteristics
Differential Input Threshold
-0.2
Input Hysteresis
25
Output Voltage HIGH
Vcc-0.4
Output Voltage LOW
Three-State ( High Impedance)
Output Current
Input Resistance
12 15
Input Current (A, B); VIN = 12V
Input Current (A, B); VIN = -7V
Short Circuit Current
SP3491 RECEIVER
AC Characteristics
Max. Transmission Rate
10
Receiver Input to Output, tPLH 40 70
Receiver Input to Output, tPLH
Receiver Input to Output, tPHL
Receiver Input to Output, tPHL
40
70
Differential Receiver Skew
4
Receiver Enable to Output
LOW
Receiver Enable to Output
HIGH
Receiver Disable from LOW
65
65
65
Receiver Disable from HIGH
65
POWER REQUIREMENTS
Supply Voltage
+3.0
Supply Current
1000
Supply Current
800
ESD Protection for R, D, DE,
REB, A, B, Y and Z pins
+/-2
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
+0.2
0.4
+/-1
+1.0
-0.8
60
Volts
mV
Volts
Volts
µA
-7V ≤ VCM ≤ +12V
VCM = 0V
IO = -1.5mA, VID = +200mV
IO = +2.5mA, VID = -200mV
0V ≤ VO ≤ Vcc; REB = Vcc
kΩ -7V ≤ VCM ≤ +12V
mA DE = 0V, VCC = 0V or 3.6V,
VIN = 12V
mA DE = 0V, VCC = 0V or 3.6V,
VIN = -7V
mA 0V ≤ VO ≤ VCC
Mbps REB = 0V, DE = 0V
120 ns Figures 6 and 12
85 ns TAMB = +25°C, Vcc = 3.3V, Figures
6 and 12
120 ns Figures 6 and 12
85 ns TAMB = +25°C, Vcc = 3.3V, Figures
6 and 12
ns |tPHL(A)- tPLH(A)|, |tPHL(B)- tPLH(B)|,
Figures 6 and 12
150 ns Figures 7 and 13; S1 Closed, S2
open
150 ns Figures 7 and 13; S2 Closed, S1
open
200 ns Figures 7 and 13; S1 Closed, S2
open
200 ns Figures 7 and 13; S2 Closed, S1
open
+3.6
2000
1500
V
µA REB, D = 0V or VCC; DE = VCC
µA DE = 0V
kV Human Body Model
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3490_3491_102_102710
5 Page 
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP3490_3491_102_102710
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SP3490.PDF ] | |
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