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PDF SP3083E Data sheet ( Hoja de datos )
| Número de pieza | SP3083E | |
| Descripción | Advanced-Failsafe RS-485/RS-422 Transceivers | |
| Fabricantes | Exar | |
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SP3080E-3088E
Advanced-Failsafe RS-485/RS-422 Transceivers
1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected
FEATURES
• 5.0V single supply operation
• Receiver failsafe on open, shorted or terminated lines
• 1/8th Unit Load, 256 transceivers on bus
• Robust ESD protection for RS-485 pins
o ±15kV Air-Gap Discharge
o ±15kV Human Body Model
RO
RE 2
DE 3
DI 4
8 PIN NSOIC
SP3082E
SP3085E
SP3088E
Half Duplex
8 Vcc
7B
6A
5 GND
o ±8kV Contact Discharge
• Controlled driver slew rates
o 115kbps, Low EMI (SP3080E, SP3081E, SP3082E)
o 500kbps, Low EMI (SP3083E, SP3084E, SP3085E)
o High Speed, 20Mbps (SP3086E, SP3087E, SP3088E)
•Hot Swap glitch protection on control inputs
•Driver short circuit current limit and
Vcc
RO 2
DI 3
GND 4
8 PIN NSOIC
SP308E
SP3084E
SP3087E
Full Duplex
8A
7B
6Z
5Y
thermal shutdown for overload protection
•Ultra-low 400μA quiescent current
•1μA shutdown mode (except SP3081E, SP3084E, SP3087E)
•Industry standard package footprints
APPLICATIONS
NC
RO 2
RE 3
DE 4
DI 5
4 PIN NSOIC
SP3080E
SP3083E
SP3086E
4 Vcc
3 NC
2 A
B
0 Z
• Motor Control
• Building Automation
• Security Systems
• Remote Meter Reading
GND 6
GND 7
Full Duplex 9 Y
8 NC
• Long or un-terminated transmission lines
DESCRIPTION
The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional commu-
nication on multipoint bus transmission lines. Each device contains one differential driver and one
differential receiver. The SP3082E, SP3085E and SP3088E are half-duplex devices; other part num-
bers are full-duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and
RoHS compliant packages are available for all models.
These devices are ruggedized for use in harsh operating conditions over the entire common-mode
voltage range from -7V to +12V. Receivers are specially designed to fail-safe to a logic high output
state if the inputs are left un-driven or shorted. All RS-485 bus-pins are protected against severe
ESD events up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge (IEC
61000-4-2). Drivers are protected from excess current flow caused by bus contention or output short-
circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for in-
dustrial (-40 to +85ºC) operating temperatures. Receivers have exceptionally high input impedance,
which places only 1/8th the standard load on a shared bus. Up to 256 transceivers may coexist while
preserving full signal margin.
All devices operate from a single 5.0V power supply and draw negligible quiescent power. All ver-
sions except the SP3081E, SP3084E, and SP3087E may independently enable and disable their
driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled.
All outputs maintain high impedance in shutdown or when powered-off.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3080E-SP3088E_101_082611
1 page  
PARAMETER
Digital Input Signals: DI, DE, RE
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Logic input thresholds
Logic Input Current
Input Hysteresis
Driver
Differential Driver Output (Vod)
Differential Driver Output, Test 1
Differential Driver Output, Test 2
Change in Magnitude of Differential Output
Voltage (ΔVod) (Note 1)
Driver Common Mode Output Voltage (Vcc)
High, Vih
Low, Vil
Ta = 25°C, after first transition
Ta = 25°C
No Load
Rl=100Ω (RS-422)
Rl=54Ω (RS-485)
Vcm = -7 to +12V
Rl=54 or 100Ω
Rl=54 or 100Ω
2.0
2
1.5
1.5
1
V
0.8
±1 μA
100 mV
Vcc
V
Vcc
2.7 Vcc V
Vcc
±0.2 V
3V
Change in Common Mode Output Voltage
(ΔVoc)
Rl=54 or 100Ω
±0.2 V
Driver Short Circuit Current Limit
-7V ≤ Vout ≤ +12V (Note 5)
Output Leakage Current (Full-duplex versions,
Y & Z pins) Note 2
DE=0,
RE=0,
Vcc=0 or
5.5V
Vout=12V
Vout= -7V
Receiver
Receiver Input Resistance
-7V ≤ Vcm ≤ 12V
Input Current (A, B pins)
DE=0,
RE=0,
Vcc=0 or
5.5V
Vin= 12V
Vin= -7V
Receiver Differential Threshold (VA-VB)
-7V ≤ Vcm ≤ 12V
Receiver Input Hysteresis
Receiver
Output
Voltage
Voh
Vol
Iout = -8mA, Vid = -40mV
Iout = 8mA, Vid = -200mV
High-Z Receiver Output Current
Vcc =5.5V, 0 ≤ Vout ≤ Vcc
Receiver Output Short Circuit Current
0V ≤ Vro ≤ Vcc
Supply and Protection
Supply
Current
IQ, Active Mode
Shutdown Mode
No load, DI=0 or Vcc
DE=0, RE=Vcc, DI=Vcc
Thermal Shutdown Temperature
Junction temperature
Thermal Shutdown Hysteresis
-100
96
-100
-200
Vcc-1.5
-125
25
400
165
15
±250
125
125
-40
0.4
±1
± 95
900
1
mA
μA
KΩ
μA
mV
mV
V
μA
mA
μA
μA
oC
Notes:
1. Change in Magnitude of Differential Output Voltage and Change in Magnitude of Common Mode Output Voltage are the changes in output voltage when DI input changes state.
2. Except devices which don’t have DE or RE inputs.
3. The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns the device does not enter shutdown. If the enable inputs
are held in this state for at least 600ns the device is assured to be in shutdown. In this low power mode most circuitry is disabled and supply current is typically 1nA.
4.Characterized, not 100% tested.
5. See Driver Short Circuit Limit Test Circuit.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3080E-SP3088E_101_082611
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
Driver Propagation Delay
(SP3080E-SP3082E)
54
C L=15pF, V ID =±2V
52
50
48
46
Pr4o4pagation Delay (ns)
42
40
-60 -40 -20
0 20 40
Temperature (ºC)
60 80 100
Receiver Average Propagation Delay vs
Temperature (SP3086E-SP3088E)
Driver and Receiver Hot Swap
Performance vs. Vcc
Driver output Waveform
Low to High (SP3080E-SP3082E)
Driver output Waveform
High to Low (SP3080E-SP3082E)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP3080E-SP3088E_101_082611
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet SP3083E.PDF ] | |
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