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PDF ISL32496E Data sheet ( Hoja de datos )
| Número de pieza | ISL32496E | |
| Descripción | (ISL32490E - ISL32498E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil | |
| Logotipo |  |
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±60V Fault Protected, 5V, RS-485/RS-422 Transceivers
with ±25V CMR and ESD Protection
ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E,
ISL32498E
The ISL32490E, ISL32492E, ISL32493E, ISL32495E,
ISL32496E, ISL32498E 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 fault protected up to
±60V and are protected against ±16.5kV ESD strikes without
latch-up. 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 fault protected RS-485 family one of the most
robust on the market.
Transmitters (Tx) 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.
Features
• Fault Protected RS-485 Bus Pins . . . . . . . . . . . . . . Up to ±60V
• Extended Common Mode Range . . . . . . . . . . . . . . . . . . . ±25V
More than Twice the Range Required for RS-485
• ±16.5kV HBM ESD Protection on RS-485 Bus Pins
• 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
Receiver (Rx) inputs feature a “Full Fail-Safe” design that
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 RS-485
transceivers with cable invert (polarity reversal) pins, please
see the ISL32483E data sheet.
• Low Quiescent Supply Current . . . . . . . . . . . . . . . . . . . 2.3mA
• Ultra Low Shutdown Supply Current . . . . . . . . . . . . . . . . 10µA
Applications
• Utility Meters/Automated Meter Reading Systems
• High Node Count RS-485 Systems
• PROFIBUS™ and RS-485 Based Field Bus Networks, and
Factory Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
30
B
25
A
20
VID = ±1V
15
10
5
RO
0
-5
TIME (20ns/DIV)
FIGURE 1. EXCEPTIONAL Rx OPERATES AT >15Mbps EVEN WITH
A ±25V COMMON MODE VOLTAGE
25
12
0
-7
-12
-20
-25
STANDARD RS-485
TRANSCEIVER
CLOSEST
COMPETITOR
ISL3249xE
FIGURE 2. ISL3249xE DELIVERS SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
March 16, 2012
FN7786.2
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Free Datasheet http://www.datasheet4u.com/
1 page  
ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, ISL32498E
Absolute Maximum Ratings
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
Input/Output Voltages
A/Y, B/Z, A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60V
A/Y, B/Z, A, B, Y, Z
(Transient Pulse Through 100Ω, (Note 15 on page 9) . . . . . . . . . . . ±80V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC +0.3V)
Short Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . see “ESD PERFORMANCE” on page 6
Latch-up (Tested per JESD78, Level 2, Class A) . . . . . . . . . . . . . . . +125°C
Thermal Information
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
8 Ld MSOP Package (Notes 4, 5) . . . . . . . .
140
40
8 Ld SOIC Package (Notes 4, 5) . . . . . . . . .
108
47
10 Ld MSOP Package (Note 4, 5). . . . . . . .
135
50
14 Ld SOIC Package (Notes 4, 5) . . . . . . . .
88
39
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . . . -65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Supply Voltage (VCC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Bus Pin Common Mode Voltage Range. . . . . . . . . . . . . . . . . . -25V to +25V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. For θJC, the “case temp” location is taken at the package top center.
Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = +25°C (Note 6).
Boldface limits apply over the operating temperature range, -40°C to +85°C.
SYMBOL
PARAMETER
DC CHARACTERISTICS
TEST CONDITIONS
TEMP
MIN
MAX
(°C) (Note 14) TYP (Note 14) UNITS
VOD1
Driver Differential VOUT
(No load)
Full -
- VCC V
VOD2
Driver Differential VOUT
(Loaded, Figure 3A)
RL = 100Ω (RS-422)
RL = 54Ω (RS-485)
Full 2.4 3.2
-
Full 1.5 2.5 VCC
RL = 54Ω (PROFIBUS, VCC ≥ 5V)
Full 2.0 2.5
RL = 21Ω (Six 120Ω terminations for Star
Full
0.8
1.3
Configurations, VCC ≥ 4.75V)
-
ΔVOD
Change in Magnitude of Driver
Differential VOUT for
Complementary Output
States
RL = 54Ω or 100Ω (Figure 3A)
Full -
- 0.2
V
V
V
V
VOD3 Driver Differential VOUT with RL = 60Ω, -7V ≤ VCM ≤ 12V
Full 1.5 2.1 VCC
Common Mode Load
(Figure 3B)
RL = 60Ω, -25V ≤ VCM ≤ 25V (VCC ≥ 4.75V)
Full
1.7
2.3
RL = 21Ω, -15V ≤ VCM ≤ 15V (VCC ≥ 4.75V)
Full
0.8
1.1
-
VOC Driver Common-Mode VOUT RL = 54Ω or 100Ω
(Figure 3)
RL = 60Ω or 100Ω, -20V ≤ VCM ≤ 20V
Full -1
Full -2.5
-
-
3
5
ΔVOC
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output
States
RL = 54Ω or 100Ω (Figure 3A)
Full -
- 0.2
V
V
V
V
V
IOSD
IOSD1
IOSD2
VIH
Driver Short-Circuit Current
Logic Input High Voltage
DE = VCC, -25V ≤ VO ≤ 25V (Note 8)
At First Fold-back, 22V ≤ VO ≤ -22V
At Second Fold-back,
35V ≤ VO ≤ -35V
DE, DI, RE
Full -250 - 250 mA
Full -83
83 mA
Full -13
13 mA
Full 2.5
-
-
V
5 FN7786.2
March 16, 2012
Free Datasheet
5 Page 
ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, ISL32498E
Test Circuits and Waveforms (Continued)
VCC
DE
DI
SIGNAL
GENERATOR
Z
D
Y
54Ω CD
+
VOD
-
DI
DIFF OUT (Y - Z)
-VOD
3V
0V
+VOD 0V
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. DRIVER DATA RATE
RE
B
A
R RO
15pF
B VCM + 750mV
VCM
VCM
A VCM - 750mV
SIGNAL
GENERATOR
VCM
SIGNAL
GENERATOR
tPLH
tPHL
VCC
RO
50%
50%
0V
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
SIGNAL
GENERATOR
RE
B
A
R RO
1kΩ
15pF
VCC
SW GND
(Note 11)
RE
1.5V
1.5V
3V
0V
PARAMETER
tHZ
tLZ
tZH (Note 10)
tZL (Note 10)
tZH(SHDN) (Note 13)
tZL(SHDN) (Note 13)
DE
0
0
0
0
0
0
A
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
SW
GND
VCC
GND
VCC
GND
VCC
tZH, tZH(SHDN)
(Note 11)
RO
tZL, tZL(SHDN)
(Note 11)
RO
tHZ
OUTPUT HIGH
1.5V
VOH - 0.5V
tLZ
1.5V
OUTPUT LOW
VOL + 0.5V
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
VOH
0V
VCC
VOL
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards used for long haul or noisy environments.
RS-422 is a subset of RS-485, so RS-485 transceivers are also
RS-422 compliant. RS-422 is a point-to-multipoint (multidrop)
standard, which allows only one driver and up to 10 (assuming
one-unit load devices) receivers on each bus. RS-485 is a true
multipoint standard, which allows up to 32 one-unit load devices
(any combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 specification requires that
drivers must handle bus contention without sustaining any
damage.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for runs as long as
4000 feet; thus, the wide CMR is necessary to handle ground
potential differences, as well as voltages induced in the cable by
external fields.
The ISL3249xE is a family of ruggedized RS-485 transceivers
that improves on the RS-485 basic requirements and thereby
11 FN7786.2
March 16, 2012
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ISL32496E.PDF ] | |
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