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PDF SP3073E Data sheet ( Hoja de datos )
| Número de pieza | SP3073E | |
| Descripción | RS-485/RS422 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3073E (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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SP3070E - SP3078E Family
±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe
RS-485/RS422 Transceivers
Features
■ ±15kV ESD protection for RS485 pins
■ 3.3V low-power operation
■ Advanced Receiver-failsafe protection for
open, shorted or terminated lines
■ Up to 256 Transceivers may share Bus
■ Very low load for 8x greater fanout
■ Hot Swap glitch protection RE and DE
■ Thermal shutdown protects against driver
contention
■ Available in three industry standard footprints
■ SP3070E, 3073 and 3076 in Full-Duplex (14 pin)
■ SP3071E, 3074 and 3077 in Full-Duplex (8 pin)
■ SP3072E, 3075 and 3078 in Half-Duplex (8 pin)
■ Three applications-optimized speed grades
■ SP3070E-72E: 250kbps slew-limited
■ SP3073E-75E: 500kbps slew-limited
■ SP3076E-78E: 16Mbps high speed
■ Small form factor SO-narrow packages
■ Industrial (-40 to +85ºC) and Extended
(-40 to +125ºC) temperature grades
RO 1
RE 2
DE 3
DI 4
8 PIN NSOIC
SP3072E
SP3075E
SP3078E
Half Duplex
8 Vcc
7B
6A
5 GND
Vcc 1
RO 2
DI 3
GND 4
8 PIN NSOIC
SP3071E
SP3074E
SP3077E
Full Duplex
8A
7B
6Z
5Y
NC 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
14 PIN NSOIC
SP3070E
SP3073E
SP3076E
Full Duplex
14 Vcc
13 NC
12 A
11 B
10 Z
9Y
8 NC
Now Available in Lead Free Packaging
applications
■ Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale
DESCRIPTION
The SP3070E-3078E differential line transceivers are suitable for bidirectional communication
on balanced multipoint bus transmission lines and comply with both RS485 and RS422 EIA
Standards. Each device consists of a differential driver and differential receiver. All devices
operate from a 3.3V power supply.
High receiver input impedance allows a large number of transceivers to share a common
data bus while maintaining signal margin and without excessive loading or use of expensive
repeaters. The high impedance driver output is maintained over the entire common-mode
voltage range from -7 to +12V. Receivers will failsafe to logic 1 output when inputs are open,
shorted or terminated. Drivers include built-in short-circuit protection and a thermal-overload
shutdown to protect against excessive power dissipation from bus contention or cable faults.
All RS485 receiver inputs and driver outputs are ESD protected up to ±15kV (Air-Gap and
Human Body Model) and up to ±8kV Contact discharge (IEC 61000-4-2). The SP3070E-
SP3078E devices may not achieve optimal transmit performance if the connected receiver
includes a biasing network to 5.0V without a termination resistor. Please see Exar Application
Note ANI#21 for further details.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3070E-SP3078E_102_120210
1 page  
DRIVER SWITCHING CHARACTERISTICS
Unless otherwise noted VCC = +3.3 ±0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3,
ambient temperature TA = +25ºC.
SP3070E, SP3071E & SP3072E Driver Switching Characteristics
DRIVER CHARACTERISTICS:
Conditions
Min. Typ. Max. Unit
Data Signaling Rate
Duty Cycle 40 to 60%
250
Kbps
Driver Propagation Delay (tPHL, tPLH)
Driver Output Rise/Fall Time (tR, tF)
RL = 54Ω, CL = 50pF,
Figure 2 & 3
250
350
1500 ns
1600 ns
Driver Differential Skew (tPLH – tPHL)
200 ns
Driver Enable to Output High (tZH)
Driver Enable to Output Low (tZL)
Driver Disable from Output High (tHZ)
RL = 500Ω, CL = 50pF,
Figure 4 & 5
2500 ns
2500 ns
100 ns
Driver Disable from Output Low (tLZ)
100 ns
Driver Enable from Shutdown to Output
High (t )ZH(SHDN)
Figure 4
5500 ns
Driver Enable from Shutdown to Output
Low (t )ZL(SHDN)
Figure 5
5500 ns
Time to Shutdown (tSHDN)
50 200 600 ns
RECEIVER SWITCHING CHARACTERISTICS
Unless otherwise noted VCC = +3.3 ±0.3V, ambient temperature TMIN < TA < TMAX. Typical values are at VCC = 3.3,
ambient temperature TA = +25ºC.
SP3070E, SP3071E & SP3072E Receiver Switching Characteristics
RECEIVER CHARACTERISTICS:
Conditions
Min. Typ. Max. Unit
Data Signaling Rate
Duty Cycle 40 to 60% 250
Kbps
Receiver Propagation Delay (tPLH, tPHL)
Propagation Delay Skew (tPLH, tPHL)
Cl=15pF, Figure 6 & 7
200 ns
30 ns
Receiver Enable to Output High (tZH)
Figure 8
50 ns
Receiver Enable to Output Low (tZL)
Figure 8
50 ns
Receiver Disable from Output High (tHZ) Figure 8
100 ns
Receiver Disable from Output Low (tLZ)
Figure 8
200 ns
Receiver Enable from Shutdown to Output
High
Figure 8
4000 ns
Receiver Enable from Shutdown to Output
Low
Figure 8
4000 ns
Time to Shutdown (tSHDN)
50 200 600 ns
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3070E-SP3078E_102_120210
5 Page 
figure 7. receiver enable & disable times test circuit
1.5V
-1.5V
S3 B
AR
RE
GENERATOR
50W
1kW
CL = 15pF
S1
S2
VCC
figure 8. receiver enable & disable timing diagram
S1 is open S2 is closed S3 = 1.5V
3V
RE 1.5V
t tZH, ZH(SHDN)
VOH
OUT
VOH/2
0V
S1 is closed, S2 is open, S3 = -1.5V
3V
RE 1.5V
t tZL, ZL(SHDN)
0V
OUT
VOL = VCC/2
VCC
VOL
S1 is open S2 is closed S3 = 1.5V
RE
0.25V
1.5V
tHZ
OUT
3V
VOH
0V
S1 is closed, S2 is open, S3 = -1.5V
RE 1.5V
3V
t LZ
0V
OUT
0.25V
VCC
VOL
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP3070E-SP3078E_102_120210
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SP3073E.PDF ] | |
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