SP1486E Datasheet PDF - Exar

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SP1486E
Exar

Part Number SP1486E
Description 20Mbps PROFIBUS RS485/RS422 Transceivers
Page 15 Pages


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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

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Pin Name
1
2
3
4
5
6
7
8
Pin Function
RO
RE
DE
DI
GND
A
B
Vcc
PIN ASSIGNMENTS
Pin Function
Receiver Output. When RE is low and if (A – B) ≥ -40mV, RO is High. If (A – B) ≤ - 200mV, RO
is low.
Receiver Output Enable. RO is enabled when RE is low. When RE is high, RO is high imped-
ance. Drive RE high and DE low to enter shutdown mode. RE is a hot-swap input.
Driver Output Enable. When DE is high, outputs are enabled. When DE is low, outputs are
high impedance. Drive DE low and RE high to enter shutdown mode. DE is a hot-swap input.
Driver Input. With DE high, a low level on DI forces non-inverting output low and inverting out-
put high. Similarly, a high level on DI forces non-inverting output high and inverting output low.
Ground
Non-inverting Receiver Input and Non-inverting Driver Output
Inverting Receiver Input and Inverting Driver Output
Positive Supply Vcc. Bypass Vcc to GND with a 0.1uF capacitor.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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Absolute Maximum Ratings
These are stress ratings only and functional opera-
tion of the device at these ratings or any other above
those indicated in the operation sections of the speci-
fications below is not implied. Exposure to absolute
maximum rating conditions for extended periods of
time may affect reliability.
Supply Voltage (VCC)....................................................+ 7.0V
Input voltage at control input pins (RE, DE)... -0.3V to Vcc+0.3V
Driver input voltage (DI) .........................-0.3V to Vcc+0.3V
Driver output voltage (A, B) .........................................+13V
Receiver output voltage (RO) ..............-0.3V to (Vcc + 0.3V)
Receiver input voltage (A, B) ......................................+13V
Package Power Dissipation....................450mW @ Ta=25°C
Maximum Junction Temperature................................. 150°C
8-Pin SOICN Øja =.............................................128.4°C/W
Storage Temperature..................................-65°C to +150°C
RECOMMENDED OPERATING CONDITIONS
Vcc=5V ±10%, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C
Recommended Operating Conditions
Min. Typ.
Max.
Unit
Supply Voltage, Vcc
Input Voltage on A and B pins
High-level input voltage (DI, DE or RE), Vih
Low-level input voltage (DI, DE or RE), Vil
Output Current
Driver
Receiver
Signaling Rate,
Operating Free Air
Temperature, Ta
Industrial Grade (E)
Junction Temperature, Tj
Note: The least positive (most negative) limit is designated as the maximum value.
4.5
-7
2
0
-60
-8
-40
-40
5
5.5 V
12 V
Vcc V
0.8 V
60
mA
8
20 Mbps
85 °C
150 °C
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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PARAMETER
Digital Input Signals: DI, DE, RE
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Logic input thresholds
High, Vih
Low, Vil
2.0
V
0.8
Logic Input Current
Ta=25°C, after first transition
±1 μA
Input Hysteresis
Ta=25°C
100 mV
Driver
Differential Driver Output (VOD)
No Load
Vcc
V
Differential Driver Output
Rl=100Ω (RS422)
Rl=54Ω (RS485)
2.1 Vcc
2.1 2.7 Vcc
V
Differential Driver Output
Vcm=-7 to +12V
2.1 2.7 Vcc
Change in Magnitude of Differential Output
Voltage (ΔVOD) (Note 1)
Rl=54 or 100Ω
±0.2
V
Driver Common Mode Output Voltage (Voc) Rl=54 or 100Ω
3V
Change in Common Mode Output Voltage
(ΔVOC)
Rl=54 or 100Ω
±0.2
V
Driver Short Circuit Current Limit
Receiver
Receiver Input Resistance
Input Current (A, B pins)
Receiver Differential Threshold (VA-VB)
Receiver Input Hysteresis
Receiver
Output
Voltage
Voh
Vol
High-Z Receiver Output Current
-7V≤Vout≤+12V
-7V≤Vcm≤12V
DE=0,
RE=0,
Vcc=0 or
5.5V
Vin=12V
Vin=-7V
-7V≤Vcm≤12V
Iout=-8mA, Vid=-40mV
Iout=8mA, Vid=-200mV
Vcc=5.5V, 0≤Vout≤Vcc
±250
96
-100
-200
Vcc-1.5
-125
25
125
-40
0.4
±1
mA
μA
mV
mV
V
μA
Receiver Output Short Circuit Current
Supply and Protection
Supply
Current
IQ, Active Mode
Shutdown Mode
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
0V≤Vro ≤Vcc
No load, DI=0 or Vcc
DE=0, RE=Vcc, DI=Vcc or 0
Junction temperature
± 95
0.30
165
15
1
1
mA
mA
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. 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.
3. Characterized, not 100% tested
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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