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PDF SP1486E Data sheet ( Hoja de datos )
| Número de pieza | SP1486E | |
| Descripción | 20Mbps PROFIBUS RS485/RS422 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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SP1486E
+5V, 20Mbps PROFIBUS RS485/RS422 Transceivers
Advanced Failsafe, 1/8th Unit Load, ±15kV ESD-Protected
FEATURES
• Recommended for PROFIBUS applications
• High differential output drive,
minimum 2.1V into 54Ω load
• 5.0V Single Supply Operation
• 1ns driver and receiver skew
• 20 Mbps data rate
• 1/8th Unit Load, 256 transceivers on bus
• Robust ESD Protection for RS485 pins
• ±15kV Air-Gap Discharge
• ±15kV Human Body Model
• ±8kV Contact Discharge
• Hot Swap glitch protection on control inputs
• Receiver failsafe on open, short
or terminated lines
• Driver short circuit current limit and
thermal shutdown for overload protection
• Very low 300μA static power consumption
• 1μA shutdown mode
1 RO
2 RE
B
R
VCC 8
B7
3 DE
4
DI
D
SP1486E
A6
GND 5
+5V
100nF
RT
APPLICATIONS
• High Speed RS485 Communications
• Industrial Process Control
• PROFIBUS applications
DESCRIPTION
SP1486E is a half duplex differential line transceiver suitable for high speed bidirectional commu-
nication on multipoint bus transmission lines. Each device contains one differential driver and one
differential receiver. Devices comply with TIA/EIA-485 and TIA/EIA-422 standards and also meet the
higher drive and tighter skew requirements of PROFIBUS applications. Lead-free and RoHS compli-
ant packages are available for all models.
PROFIBUS is in wide use in industrial control and automation applications and the SP1486E is rug-
gedized for use in harsh operating conditions. Receivers are specially designed to fail-safe to a logic
high output state if the inputs are left un-driven or shorted. All RS485 bus-pins are protected against
severe ESD events up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge
(IEC 1000-4-2). 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
Industrial (-40 to +85ºC) operating temperature. 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 5.0 V power supply and draw negligible quiescent power. Both driver
and receiver can be enabled and disabled independently and the device enters a low power shutdown
mode if both driver and receiver are disabled. The bus-pin outputs of disabled modules are in high
impedance state. The high impedance driver output is maintained over the entire common-mode volt-
age range from -7 to +12V.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP1486E_101_100710
1 page  
TIMING CHARACTERISTICS
Unless otherwise noted Vcc= +5.0±0.5V, ambient temperature Ta from -40 to +85ºC
DRIVER CHARACTERISTICS:
Data Signaling Rate
Driver Propagation Delay (tPHL, tPLH)
Driver Output Rise/Fall Time (tR, tF)
Driver Differential Skew (tPLH – tPHL)
Driver Enable to Output High (tZH)
Driver Enable to Output Low (tZL)
Driver Disable from Output High (tHZ)
Driver Disable from Output Low (tLZ)
Shutdown to Driver Output Valid (tZV)
Conditions
Duty Cycle 40 to 60%
RL = 54Ω, CL = 50pF,
RL = 500Ω, CL = 50pF,
Min. Typ. Max. Unit
20 Mbps
12 20 ns
6 10 ns
1 5 ns
50 ns
50 ns
50 ns
50 ns
150 ns
RECEIVER CHARACTERISTICS:
Data Signaling Rate
Receiver Propagation Delay (tPLH, tPHL)
Propagation Delay Skew (tPLH, tPHL)
Receiver Output Rise/Fall Time
Receiver Enable to Output High (tZH)
Receiver Enable to Output Low (tZL)
Receiver Disable from Output High (tHZ)
Receiver Disable from Output Low (tLZ)
Shutdown to Receiver Output Valid (tROV)
Time to Shutdown (Note 2,3)
Conditions
Duty Cycle 40 to 60%
Cl=15pF, Vid=±2V,
Cl=15pF
Cl=15pF, RL=1kΩ
Cl=15pF, RL=1kΩ
Cl=15pF, RL=1kΩ
Cl=15pF, RL=1kΩ
Min. Typ. Max. Unit
20 Mbps
40 ns
1 5 ns
15 ns
50 ns
50 ns
50 ns
50 ns
3500 ns
50 200 600 ns
FUNCTION TABLES
Transmitting
Inputs
Outputs
RE DE
DI
A
B
X1110
X1001
00X
High-Z
10X
Shutdown
Receiving
Inputs
Output
RE DE VA - VB RO
0
X ≥ -40mV
1
0
X ≤-200mV
0
0
X Open/shorted
1
11
X High-Z
10
X Shutdown
Note: Receiver inputs -200mV < VA - VB < -40mV, should be considered indeterminate
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP1486E_101_100710
5 Page 
Receiver Enable and Disable Times Test Circuit
DESCRIPTION
1.5V
-1.5V
S3
B
AR
RE
GENERATOR
50Ω
1kΩ
CL= 15pF
S1
Vcc
S2
Receiver Enable and DisableTiming 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
3V
RE 1.5V
0.25V
tHZ
VOH
OUT 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
SP1486E_101_100710
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SP1486E.PDF ] | |
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