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PDF ISL31496E Data sheet ( Hoja de datos )
| Número de pieza | ISL31496E | |
| Descripción | (ISL31490E - ISL31498E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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±60V Fault Protected, 5V, RS-485/RS-422
Transceivers with ±25V Common Mode Range
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E,
ISL31496E, ISL31498E
The ISL31490E, ISL31491E, ISL31492E, ISL31493E,
ISL31495E, ISL31496E, ISL31498E are fault protected,
5V powered, differential transceivers that exceed the
RS-485 and RS-422 standards for balanced
communication. The RS-485 transceiver pins (driver
outputs and receiver inputs) are protected against faults
up to ±60V. Additionally, the extended common mode
range allows these transceivers to operate in
environments with common mode voltages up to ±25V
(>2x the RS-485 requirement), making this RS-485
family one of the most robust on the market.
Transmitters deliver an exceptional 2.5V (typical)
differential output voltage into the RS-485 specified 54Ω
load. This yields better noise immunity than standard
RS-485 ICs, or allows up to six 120Ω terminations in star
network topologies.
Receiver (Rx) inputs feature a “Full Fail-Safe” design
which ensures a logic high Rx output if Rx inputs are
floating, shorted, or on a terminated but undriven (idle)
bus. Rx outputs have high drive levels - typically 15mA
@ VOL = 1V (for opto-coupled, isolated applications).
Half duplex (Rx inputs and Tx outputs multiplexed
together) and full duplex pinouts are available. See
Table 1 on page 2 for key features and configurations by
device number.
For fault protected or wide common mode range devices
with cable invert (polarity reversal) or logic supply (VL)
pins, please see the ISL31480E data sheet.
Features
• Fault Protected RS-485 Bus Pins. . . . . . Up to ±60V
• Extended Common Mode Range . . . . . . . . . . . ±25V
More than Twice the Range Required for RS-485
• 1/4 Unit Load for up to 128 Devices on the Bus
• High Transient Overvoltage Tolerance . . . . . . . ±80V
• Full Fail-safe (Open, Short, Terminated) RS-485
Receivers
• High Rx IOL for Opto-Couplers in Isolated Designs
• Hot Plug Circuitry - Tx and Rx Outputs Remain
Three-State During Power-up/Power-down
• Choice of RS-485 Data Rates . . . 250kbps to 15Mbps
• Low Quiescent Supply Current . . . . . . . . . . 2.3mA
• Ultra Low Shutdown Supply Current . . . . . . . . 10μA
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters/Automated Meter Reading Systems
• High Node Count Systems
• PROFIBUS™ and Field Bus Networks, and Factory
Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
Exceptional Rx Operates at
>15Mbps Even with a ±25V
Common Mode Voltage
30
B
25
A
20
VID = ±1V
15
10
5
RO
0
-5
TIME (20ns/DIV)
ISL3149xE Delivers Superior
Common Mode Range vs
Standard RS-485 Devices
25
12
0
-7
-12
-20
-25
STANDARD RS-485 CLOSEST
TRANSCEIVER COMPETITOR
ISL3149xE
June 17, 2010
FN7637.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2010 All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E,
www.DataSheet4U.com
Typical Operating Circuits
ISL31492E, ISL31495E, ISL31498E
1 RO
2 RE
3 DE
+5V
8
VCC
+
0.1μF
R
B/Z 7
RT
A/Y 6
+
0.1μF
+5V
8
VCC
RT 7 B/Z
6 A/Y
DI 4
D
DE 3
RE 2
4 DI
D
GND
5
R RO 1
GND
5
ISL31490E, ISL31493E, ISL31496E (SOIC PIN NUMBERS SHOWN)
+5V
13, 14
+
0.1μF
2 RO
3 RE
VCC A 12
R B 11
RT
4 DE
5 DI
D
Z 10
Y9
GND
6, 7
+5V
+
0.1μF
13, 14
9 Y VCC
DI 5
10 Z
D
DE 4
RT 11 B
12 A
RE 3
R RO 2
GND
6, 7
2 RO
+5V
+
0.1μF
1
VCC A 8
R B7
RT
3 DI
D
Z6
Y5
GND
4
ISL31491E
+5V
+
0.1μF
1
5 Y VCC
6Z
DI 3
D
RT 7 B
8A
R RO 2
GND
4
5 FN7637.0
June 17, 2010
5 Page 
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E,
www.DataSheet4U.com
Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V,
TA = +25°C (Note 10). Boldface limits apply over the operating temperature range,
-40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP MIN
MAX
(°C) (Note 18) TYP (Note 18) UNITS
Receiver Disable from
Output Low
tLZ RL = 1kΩ, CL = 15pF, SW = VCC Full -
(Figure 6)
- 50 ns
Receiver Disable from
Output High
tHZ RL = 1kΩ, CL = 15pF, SW = GND
(Figure 6)
Full
-
- 50 ns
Time to Shutdown
tSHDN (Note 15)
Full 60 160 600
ns
Receiver Enable from
tZH(SHDN) RL = 1kΩ, CL = 15pF, SW = GND
Shutdown to Output High
(Figure 6), (Notes 15, 17)
Full
-
- 2000 ns
Receiver Enable from
tZL(SHDN) RL = 1kΩ, CL = 15pF, SW = VCC
Full
-
Shutdown to Output Low
(Figure 6), (Notes 15, 17)
- 2000 ns
NOTES:
10. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device
ground unless otherwise specified.
11. Supply current specification is valid for loaded drivers when DE = 0V.
12. Applies to peak current. See “Typical Performance Curves” beginning on page 16 for more information.
13. Keep RE = 0 to prevent the device from entering SHDN.
14. The RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN.
15. Transceivers (except on the ISL31491E) are put into shutdown by bringing RE high and DE low. If the inputs are in this state
for less than 60ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts
are guaranteed to have entered shutdown. See “Low Power Shutdown Mode” on page 16.
16. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN.
17. Set the RE signal high time >600ns to ensure that the device enters SHDN.
18. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established
by characterization and are not production tested.
19. Tested according to TIA/EIA-485-A, Section 4.2.6 (±80V for 15μs at a 1% duty cycle).
20. Does not apply to the ISL31491E.
21. See “Caution” statement below the “Recommended Operating Conditions” section on page 6.
Test Circuits and Waveforms
VCC
DE
DI
Z
D
Y
VOD
RL/2
RL/2 VOC
VCC
DE
DI
Z
D
Y
RL/2
375Ω
VOD
VOC
VCM
RL/2 375Ω
FIGURE 1A. VOD AND VOC
FIGURE 1B. VOD AND VOC WITH COMMON MODE LOAD
FIGURE 1. DC DRIVER TEST CIRCUITS
11 FN7637.0
June 17, 2010
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet ISL31496E.PDF ] | |
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