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PDF ISL81485 Data sheet ( Hoja de datos )
| Número de pieza | ISL81485 | |
| Descripción | 5V/ 30Mbps/ RS-485/RS-422 Transceiver | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
December 2003
ISL81485
FN6061
5V, 30Mbps, RS-485/RS-422 Transceiver
The Intersil ISL81485 is a BiCMOS, 5V powered, single
transceiver that meets both the RS-485 and RS-422
standards for balanced communication, and features a
larger output voltage and higher data rate to benefit high
speed applications.
Unlike competitive devices, this Intersil transceiver is
specified for 10% tolerance supplies (4.5V to 5.5V), and it
delivers a much larger worst case differential output voltage
(2.0V compared to the typical 1.5V) over the full supply
range. The increased output voltage translates into longer
reach, or better data integrity, at the 30Mbps data rate.
This device presents a “1 unit load” to the RS-485 bus,
which allows up to 32 transceivers on the network.
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are
floating.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
Ordering Information
PART NO.
(BRAND)
ISL81485IB
(81485IB)
ISL81485IB-T
(81485IB)
ISL81485IU
(1485)
ISL81485IU-T
(1485)
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 8 Ld SOIC
PKG. DWG. #
M8.15
-40 to 85
-40 to 85
8 Ld SOIC
M8.15
(Tape and Reel)
8 Ld MSOP
M8.118
-40 to 85 8 Ld MSOP
M8.118
(Tape and Reel)
Features
• Specified for 10% Tolerance Supplies
• High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 30Mbps
• Large Differential Output Voltage. . . . 2.0V(min.) into 54Ω
• Drop-In Replacement for the ADM1485
• One Unit Load Allows up to 32 Devices on the Bus
• Low Quiescent Current . . . . . . . . . . . . . . . . . . . . . 800µA
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 15ns (Max) Propagation Delays, 5ns (Max) Skew
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
Applications
• SCSI “Fast 20” Drivers and Receivers
• Factory Automation
• Field Bus Networks
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
Pinout
ISL81485 (SOIC, MSOP)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
R
D
8 VCC
7 B/Z
6 A/Y
5 GND
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL81485
Test Circuits and Waveforms (Continued)
VCC
DE
DI
SIGNAL
GENERATOR
Z
D
Y
CL = 100pF
RDIFF
CL = 100pF
DI
OUT (Y)
OUT (Z)
1.5V
tPLH
50%
tPHL
50%
1.5V
3V
0V
tPHL
50%
VOH
VOL
tPLH
50%
VOH
VOL
DIFF OUT (Y - Z)
90%
10%
tR
90%
10%
tF
+VOD
-VOD
SKEW = |CROSSING PT. OF Y↑ & Z↓ - CROSSING PT. OF Y↓ & Z↑|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE
SIGNAL
GENERATOR
DI
Z
D
Y
CL
110Ω
VCC
SW GND
PARAMETER OUTPUT
tHZ Y / Z
tLZ Y / Z
tZH Y / Z
tZL Y / Z
RE
X
X
X
X
DI
1/0
0/1
1/0
0/1
SW
GND
VCC
GND
VCC
CL (pF)
50
50
50
50
DE
tZH
OUT (Y, Z)
tZL
OUT (Y, Z)
1.5V
1.5V
3V
0V
tHZ
OUTPUT HIGH
2.3V
VOH - 0.5V VOH
0V
tLZ
2.3V
OUTPUT LOW
VCC
VOL + 0.5V VOL
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
VCC
DE
DI
SIGNAL
GENERATOR
Z
D
Y
RDIFF
FIGURE 4A. TEST CIRCUIT
CL = 100pF
CL = 100pF
DI
3V
0V
DIFF OUT (Y - Z)
-VOD
+VOD
0V
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER DATA RATE
5
5 Page 
ISL81485
Small Outline Plastic Packages (SOIC)
N
INDEX
AREA
E
-B-
H
0.25(0.010) M B M
123
-A-
D
SEATING PLANE
A
L
h x 45o
-C-
e A1
B
0.25(0.010) M C A M B S
µα
0.10(0.004)
C
NOTES:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Inter-
lead flash and protrusions shall not exceed 0.25mm (0.010 inch) per
side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater
above the seating plane, shall not exceed a maximum value of
0.61mm (0.024 inch).
10. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact.
M8.15 (JEDEC MS-012-AA ISSUE C)
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC
PACKAGE
INCHES
MILLIMETERS
SYMBOL MIN MAX MIN MAX NOTES
A
0.0532 0.0688 1.35
1.75
-
A1
0.0040 0.0098 0.10
0.25
-
B
0.013 0.020 0.33
0.51
9
C
0.0075 0.0098 0.19
0.25
-
D
0.1890 0.1968 4.80
5.00
3
E
0.1497 0.1574 3.80
4.00
4
e 0.050 BSC 1.27 BSC -
H
0.2284 0.2440 5.80
6.20
-
h
0.0099 0.0196 0.25
0.50
5
L
0.016 0.050 0.40
1.27
6
N8
87
α 0o 8o 0o 8o -
Rev. 0 12/93
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet ISL81485.PDF ] | |
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