How it Works
Datasheet
Loading...
SP3491EN-L
Specification
12 pgs763.21 Kb0

Datasheet SP3491EN-L Specification

Download
Page 1
SP3490/SP3491
V
CC
D
R
A
B
Z
Y
R
GND
2
1
3
4
5
6
7
8
D
V
CC
D
R
NC
A
B
Z
Y
R
NC
NC
DE
REB
GND GND
2
1
3 4
5
6 7
8
9
10
11
12
13
14
D
+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
• Allows up to 32 transceivers on the serial bus
• Compatability with LTC490 and SN75179 (SP3490)
• Compatability with LTC491 and SN75180 (SP3491)
The SP3490 and SP3491 devices are +3.3V low power full-duplex transceivers that meet
the specications 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 sacricing performance. The SP3490 and SP3491 meet the electrical specications 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.
SP3490
DESCRIPTION
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
SP3491
1
Page 2
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those
indicated in the operation sections of the specications
below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
VCC.....................................................................+6.0V
Input Voltages
Logic....................................-0.3V to +6.0V
Drivers.................................-0.3V to +6.0V
Receivers.........................................+/-14V
Output Voltages
Drivers.............................................+/-14V
Receivers............................-0.3V to +6.0V
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
8-pin NSOIC...................................................600mW
(derate 6.90mW/ºC above +70ºC)
14-pin NSOIC.................................................700mW
(derate 8.33mW/ºC above +70ºC)
T
= T
to T
AMB
and VCC = +3.3V +/-5% unless otherwise noted.
MIN
MAX
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP3490 DRIVER
DC Characteristics
Differential Output Voltage GND Vcc Volts Unloaded; R = ∞Ω ; Figure 1
Differential Output Voltage 2 Vcc Volts With Load; R = 50Ω (RS-422);
Differential Output Voltage 1.5 Vcc Volts With Load; R = 27Ω (RS-485);
Change in Magnitude of Driver Differential Output Voltage for Complimentary states
Driver Common Mode Output Voltage
Input High Voltage 2.0 Volts
Input Low Voltage 0.8 Volts
Input Current +/-10 µA
Driver Short Circuit Current
V
= HIGH +/-250 mA -7V ≤ VO ≤ +12V; Figure 8
OUT
V
= LOW +/-250 mA -7V ≤ VO ≤ +12V; Figure 8
OUT
SP3490 DRIVER
AC Characteristics
Max. Transmission Rate 10 Mbps
Driver Input to Output, t
Driver Input to Output, t
PLH
PHL
20 40 60 ns R = 27Ω, Figures 2 & 9
20 40 60 ns R = 27Ω, Figures 2 & 9
Differential Driver Skew 2 ns |t
Driver Rise or Fall Time 5 20 ns From 10%-90%; Figures 3 and 10
ELECTRICAL CHARACTERISTICS
Figure 1
Figure 1
0.2 Volts R = 27Ω or R = 50Ω; Figure 1
3 Volts R = 27Ω or R = 50Ω; Figure 1
(Y)- t
PLH
(Y)|, |t
PHL
Figures 2 and 9
PHL
(Z)- t
PLH
(Z)|,
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
2
Page 3
T
= T
to T
AMB
and VCC = +3.3V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP3490 RECEIVER
DC Characteristics
Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V
Input Hysteresis 25 mV VCM = 0V
Output Voltage HIGH Vcc-0.4 Volts IO = -1.5mA, VID = +200mV
Output Voltage LOW 0.4 Volts IO = +2.5mA, VID = -200mV
Input Resistance 12 15 kΩ -7V ≤ VCM ≤ +12V
Input Current (A, B); VIN = 12V +1.0 mA VIN = 12V
Input Current (A, B); VIN = -7V -0.8 mA VIN = -7V
Short Circuit Current 60 mA 0V ≤ VO ≤ V
CC
SP3490 RECEIVER
AC Characteristics
Max. Transmission Rate 10 Mbps
Receiver Input to Output, t
Receiver Input to Output, t
Receiver Input to Output, t
Receiver Input to Output, t
PLH
PLH
PHL
PHL
Differential Receiver Skew 4 ns |t
40 70 120 ns Figures 6 and 12
85 ns T
= +25°C, Vcc = 3.3V Figures
AMB
6 and 12
40 70 120 ns Figures 6 and 12
85 ns T
= +25°C, Vcc = 3.3V Figures
AMB
6 and 12
(A)- t
PLH
(A)|, |t
PHL
Figures 6 and 12
PHL
(B)- t
POWER REQUIREMENTS
Supply Voltage 3.0 3.3 3.6 V
Supply Current 1000 2000 µA D = 0V or V
ESD Protection for D, R, A, B,
+/-2 kV Human Body Model
CC
Y and Z pins
PLH
(B)|,
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
3
Page 4
T
= T
to T
AMB
and VCC = +3.3V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP3491 DRIVER
DC Characteristics
Differential Output Voltage GND Vcc Volts Unloaded; R = ∞Ω ; Figure 1
Differential Output Voltage 2 Vcc Volts With Load; R = 50Ω (RS-422);
Figure 1
Differential Output Voltage 1.5 Vcc Volts With Load; R = 27Ω (RS-485);
Figure 1
Change in Magnitude of Driver
0.2 Volts R = 27Ω or R = 50Ω; Figure 1
Differential Output Voltage for Complimentary states
Driver Common Mode Output
3 Volts R = 27Ω or R = 50Ω; Figure 1
Voltage
Input High Voltage 2.0 Volts Applies to DE, D, REB
Input Low Voltage 0.8 Volts Applies to DE, D, REB
Input Current +/-10 µA Applies to DE, D, REB
Driver Short Circuit Current
V
= HIGH +/-250 mA -7V ≤ VO ≤ +12V; Figure 8
OUT
V
= LOW +/-250 mA -7V ≤ VO ≤ +12V; Figure 8
OUT
SP3491 DRIVER
AC Characteristics
Max. Transmission Rate 10 Mbps
Driver Input to Output, t
Driver Input to Output, t
PLH
PHL
Differential Driver Skew 2 ns |t
20 40 60 ns Figures 2 & 9
20 40 60 ns Figures 2 & 9
(Y)- t
PHL
Figures 2 and 9
PLH
(Y)|, |t
PHL
(Z)- t
PLH
(Z)|,
Driver Rise or Fall Time 5 20 ns From 10%-90%; Figures 3 and 10
Driver Enable to Output HIGH 52 120 ns Figures 4 and 11
Driver Enable to Output LOW 60 120 ns Figures 5 and 11
Driver Disable from LOW 40 120 ns Figures 5 and 11
Driver Disable from HIGH 60 120 ns Figures 4 and 11
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
4
Page 5
T
= T
to T
AMB
and VCC = +3.3V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP3491 RECEIVER
DC Characteristics
Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V
Input Hysteresis 25 mV VCM = 0V
Output Voltage HIGH Vcc-0.4 Volts IO = -1.5mA, VID = +200mV
Output Voltage LOW 0.4 Volts IO = +2.5mA, VID = -200mV
Three-State ( High Impedance)
+/-1 µA 0V ≤ VO ≤ Vcc; REB = Vcc
Output Current
Input Resistance 12 15 kΩ -7V ≤ VCM ≤ +12V
Input Current (A, B); VIN = 12V +1.0 mA DE = 0V, VCC = 0V or 3.6V,
VIN = 12V
Input Current (A, B); VIN = -7V -0.8 mA DE = 0V, VCC = 0V or 3.6V,
VIN = -7V
Short Circuit Current 60 mA 0V ≤ VO ≤ V
CC
SP3491 RECEIVER
AC Characteristics
Max. Transmission Rate 10 Mbps REB = 0V, DE = 0V
Receiver Input to Output, t
Receiver Input to Output, t
Receiver Input to Output, t
Receiver Input to Output, t
PLH
PLH
PHL
PHL
Differential Receiver Skew 4 ns |t
Receiver Enable to Output LOW
Receiver Enable to Output HIGH
40 70 120 ns Figures 6 and 12
85 ns T
= +25°C, Vcc = 3.3V, Figures
AMB
6 and 12
40 70 120 ns Figures 6 and 12
85 ns T
= +25°C, Vcc = 3.3V, Figures
AMB
6 and 12
(A)- t
PLH
(A)|, |t
PHL
Figures 6 and 12
65 150 ns Figures 7 and 13; S1 Closed, S
open
65 150 ns Figures 7 and 13; S2 Closed, S
open
PHL
(B)- t
PLH
Receiver Disable from LOW 65 200 ns Figures 7 and 13; S1 Closed, S
open
Receiver Disable from HIGH 65 200 ns Figures 7 and 13; S2 Closed, S
open
POWER REQUIREMENTS
Supply Voltage +3.0 +3.6 V
Supply Current 1000 2000 µA REB, D = 0V or VCC; DE = V
Supply Current 800 1500 µA DE = 0V
ESD Protection for R, D, DE,
+/-2 kV Human Body Model
REB, A, B, Y and Z pins
(B)|,
2
1
2
1
CC
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
5
Page 6
V
CC
D
R
A
B
Z
Y
R
GND
2
1
3
4
5
6
7
8
D
SP3490
VCC
D
R
NC
A
B
Z
Y
R
NC
NC
DE
REB
GND GND
2
1
3 4
5
6 7
8
9
10
11
12
13
14
D
PIN FUNCTION
Pin Function SP3490
Pin 1 - Vcc - Positive supply +3.00V < Vcc < +3.60V
Pin 2 - R - Receiver output
Pin 3 - D - Driver input
Pin 4 - GND - Ground connection
Pin 5 - Y - Non-inverting driver output
Pin 6 - Z - Inverting driver output
Pin 7 - B - Inverting receiver Input
Pin 8 - A - Non-inverting receiver input
SP3491
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
Pin Function SP3491
Pin 1 - NC - No connect
Pin 2 - R - Receiver output
Pin 3 - REB - Receiver cutput enable active LOW
Pin 4 - DE - Driver output enable active HIGH
Pin 5 - D - Driver input
Pin 6 - GND - Ground connection
Pin 7 - GND - Ground connection
Pin 8 - NC - No connect
Pin 9 - Y - Non-inverting driver output
Pin 10 - Z - Inverting driver output
Pin 11 - B - Inverting receiver Input
Pin 12 - A - Non-Inverting receiver input
Pin 13 - NC - No connect
Pin 14 - Vcc - Positive supply +3.00V < Vcc < +3.60V
6
Page 7
TEST CIRCUITS
R
R
V
OC
D
Vcc
V
OD
GENERATOR
(NOTE 1)
50Ω
C
L
OUT
D
V
CC
RL = 60Ω
CL = 15pF (NOTE 2)
GENERATOR
(NOTE 1)
50Ω
S1
RL = 110Ω
OUT
CL = 50pF (NOTE 2)
VOM = ≈ 1.5V
VOH + V
OL
2
D
GENERATOR
(NOTE 1)
50Ω
V
CC
S1
V
DM
RL = 27Ω
OUT
CL = 15pF
(NOTE 2)
V
OM
= ≈ 1.5V
VOH + V
OL
2
D
GENERATOR
(NOTE 1)
50Ω
S1
RL = 110Ω
OUT
CL = 50pF
(NOTE 2)
D
0V OR 3V
V
CC
GENERATOR
(NOTE 1)
50Ω
1.5V
0V
V
ID
R
OUT
CL = 15pF
(NOTE 2)
VOM = V
CC
2
1.5V
-1.5V
S3
V
ID
GENERATOR
(NOTE 1)
50Ω
CL = 15pF
(NOTE 2)
R
1k
S1
S2
V
CC
A/Y
D
DI = 0 or Vcc
B/Z
DE = 0 or Vcc
I
OS D
100Ω
-7V to +12V
V
Figure 1. Driver DC Test Load Circuit
Figure 3. Driver Differential Output Delay and Transition Time Circuit.
Figure 5. Driver Enable and Disable Timing Circuit, Output Low
Figure 2. Driver Propagation Delay Test Circuit
Figure 4. Driver Enable and Disable Timing Circuit, Output High
Figure 6. Receiver Propagation Delay Test Circuit
Figure 7. Receiver Enable and Disable Timing Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
Figure 8. Driver Short Circuit Current Limit Test
7
Page 8
0V
V
OH
t
PLH
t
PHL
V
OM
t
PHL
t
PLH
3V
V
OL
V
OH
1.5V
1.5V
INPUT
Y OUTPUT
V
OM
Z OUTPUT
V
OL
V
OM
V
OM
VOM =
VOH + V
OL
2
≈ 1.5V
SWITCHING WAVEFORMS
IN
1.5V
t
DO1
1.5V
t
DO2
3V
0V
OUT
50%
50%
10%
10%
90%
90%
t
TD
t
TD
2.0V
-2.0V
0V
VOH
tPZH
0.25V
tPHZ
V
OM
tPZL
tPLZ
3V
VOL
VCC
1.5V
1.5V
DE
OUTPUT
HIGH
V
OM
0.25V
0V
OUTPUT
LOW
VOM =
VOH + V
OL
2
≈ 1.5V
3V
0V
V
CC
t
RPLH
1.5V
t
RPHL
V
OM
V
OM
0V
1.5V
INPUT
OUTPUT
VOM =
V
CC
2
3V
0V
t
PRHZ
1.5V
t
PRZH
t
PRSH
1.5V
1.5V
10%
0V
V
OH
REB
OUTPUT
S1 is open S2 is closed S3 = 1.5V
3V
0V
t
PRLZ
1.5V
t
PRZL
t
PRSL
1.5V
1.5V
10%
V
CC
REB
OUTPUT
S1 is closed S2 is open S3 = -1.5V
V
OL
Figure 9. Driver Propagation Delay Waveforms
Waveforms
Figure 10. Driver Differential Output Delay and Transition Time Waveforms
Figure 12. Receiver Propagation Delay WaveformsFigure 11. Driver Enable and Disable Timing
Figure 13. Receiver Enable and Disable Waveforms
NOTE 1: The input pulse is supplied by a generator with the following characteristics: PRR = 250kHz, 50% duty cycle, tR < 6.0ns, ZO = 50Ω. NOTE 2: CL includes probe and stray capacitance.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
8
Page 9
DESCRIPTION
The SP3490 and SP3491 are two members in the family of +3.3V low power full-du­plex transceivers that meet the electrical
specications of the RS-485 and RS-422
serial protocols. These devices are pin-to­pin 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 sacricing performance.
The RS-485 standard is ideal for multi-drop applications and for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receiv­ers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differ­ences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line.
Drivers
Receivers
The receivers of the SP3490 and SP3491 have differential inputs with an input sensi­tivity of ±200mV. Input impedance of the
receivers is typically 15kΩ (12kΩ minimum).
A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers for both the SP3490 and SP3491 are equipped with a fail-safe feature that guarantees the receiver output will be in a HIGH state when the input is left unconnected.
The receiver of the SP3491 has a enable control line which is active LOW. A logic LOW on REB (pin 3) of the SP3491 will en- able the differential receiver. A logic HIGH on REB (pin 3) of the SP3491 will tri-state the receiver.
The drivers for both the SP3490 and SP3491 have differential outputs. The typical voltage output swing with no load will be 0 volts to Vcc.
With worst case loading of 54Ω across the
differential outputs, the drivers can maintain greater than 1.5V voltage levels.
The driver of the SP3491 has a driver en­able control line which is active HIGH. A logic HIGH on DE (pin 4) of the SP3491 will enable the differential driver outputs. A logic LOW on the DE(pin 4) will tri-state the driver outputs. The SP3490 does not have a driver enable.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
9
Page 10
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
10
Page 11
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
11
Page 12
Model Temperature Range Package Types
SP3490CN-L ....................................................................... 0°C to +70°C ................................................................................................8-pin NSOIC
SP3490CN-L/TR .................................................................0°C to +70°C ................................................................................................8-pin NSOIC
SP3490EN-L...................................................................... -40°C to +85°C...............................................................................................8-pin NSOIC
SP3490EN-L/TR................................................................. -40°C to +85°C.............................................................................................8-pin NSOIC
SP3491CN-L ....................................................................... 0°C to +70°C ..............................................................................................14-pin NSOIC
SP3491CN-L/TR .................................................................0°C to +70°C ..............................................................................................14-pin NSOIC
SP3491EN-L...................................................................... -40°C to +85°C.............................................................................................14-pin NSOIC
SP3491EN-L/TR................................................................. -40°C to +85°C............................................................................................14-pin NSOIC
Note: /TR = Tape and Reel
REVISION HISTORY
DATE REVISION DESCRIPTION
10/11/02 -- Legacy Sipex Datasheet
ORDERING INFORMATION
06/08/10 1.0.0 Convert to Exar Format. Update ordering information as a result of discontinued
9/14/10 1.0.1 Correct package type for SP3491 options in ordering table from 8 pin NSOIC to 14
10/27/10 1.0.2 Add ESD protection levels of +/-2kV. Remove SP3490 Supply Current rating for DE
Lead type package options per PDN 081126-01. Change revision to 1.0.0. Add new Figure 8 - Driver Short Circuit Current Limit Test Circuit
pin NSOIC
= 0V (No driver enable for SP3490).
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil­ity. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for
illustration purposes and may vary depending upon a user's specic application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to signicantly affect its safety or effectiveness. Products are not authorized for
use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Copyright 2010 EXAR Corporation
Datasheet October 2010
For technical support please email Exar's Serial Technical Support group at: serialtechsupport@exar.com
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP3490_3491_102_102710
12
Loading...
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use