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PDF ISL8487 Data sheet ( Hoja de datos )
| Número de pieza | ISL8487 | |
| Descripción | 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Data Sheet
ISL8487, ISL81483, ISL81487
December 2003
FN6050.2
1/8 Unit Load, 5V, Low Power, High Speed
or Slew Rate Limited, RS-485/RS-422
Transceivers
These Intersil RS-485/RS-422 devices are “fractional” unit
load (UL), BiCMOS, 5V powered, single transceivers that
meet both the RS-485 and RS-422 standards for balanced
communication. Unlike competitive devices, this Intersil
family is specified for 10% tolerance supplies (4.5V to 5.5V).
The ISL81483 and ISL81487 present a 1/8 unit load to the
RS-485 bus, which allows up to 256 transceivers on the
network for large node count systems (e.g., process
automation, remote meter reading systems). The 1/4 UL
ISL8487 allows up to 128 transceivers on the bus. In a
remote utility meter reading system, individual (apartments
for example) utility meter readings are routed to a
concentrator via an RS-485 network, so the high allowed
node count minimizes the number of repeaters required to
network all the meters. Data for all meters is then read out
from the concentrator via a single access port, or a wireless
link.
Slew rate limited drivers on the ISL8487 and ISL81483
reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications. Data rates up to
250kbps are achievable with these devices.
Data rates up to 5Mbps are achievable by using the
ISL81487, which features higher slew rates.
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.
These half duplex devices multiplex the Rx inputs and Tx
outputs to allow transceivers with Rx and Tx disable
functions in 8 lead packages.
Features
• Fractional Unit Load Allows up to 256 Devices on the Bus
• Specified for 10% Tolerance Supplies
• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
• High Data Rate Version (ISL81487). . . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission (ISL8487, ISL81483) . . . . . . .up to 250kbps
• Low Current Shutdown Mode (Except ISL81487) . . . 1nA
• Low Quiescent Supply Current:
- ISL8487, ISL81483. . . . . . . . . . . . . . . . . . 120µA (Max.)
- ISL81487 . . . . . . . . . . . . . . . . . . . . . . . . . 300µA (Max.)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 30ns Propagation Delays, 5ns Skew (ISL81487)
• Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Drop-In Replacements for: MAX487 (ISL8487); MAX1483
(ISL81483); MAX1487, LMS1487 (ISL81487)
Applications
• High Node Count Networks
• Automated Utility Meter Reading Systems
• Factory Automation
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL8487
HALF/FULL
DUPLEX
Half
NO. OF DEVICES DATA RATE SLEW-RATE
RECEIVER/
QUIESCENT
ALLOWED ON BUS (Mbps)
LIMITED? DRIVER ENABLE? ICC (µA)
128 0.25 Yes Yes 100
LOW POWER
SHUTDOWN?
Yes
PIN
COUNT
8
ISL81483
Half
256 0.25 Yes Yes 100 Yes 8
ISL81487
Half
256
5 No
Yes 250 No 8
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  
ISL8487, ISL81483, ISL81487
Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = 25oC,
(Note 2) (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(oC) MIN TYP MAX UNITS
Receiver Input Resistance
RIN -7V ≤ VCM ≤ 12V
ISL81483, ISL81487
ISL8487
Full
Full
96
48
-
-
- kΩ
- kΩ
No-Load Supply Current, (Note 3)
ICC ISL81487, DI, RE = 0V DE = VCC
or VCC
DE = 0V
Full - 300 500 µA
Full - 250 300 µA
ISL8487, ISL81483, DI, DE = VCC
RE = 0V or VCC
DE = 0V
Full - 150 200 µA
Full - 100 120 µA
Shutdown Supply Current
ISHDN
Driver Short-Circuit Current,
VO = High or Low
IOSD1
Receiver Short-Circuit Current
IOSR
SWITCHING CHARACTERISTICS (ISL81487)
(Note 7), DE = 0V, RE = VCC, DI = 0V or VCC
DE = VCC, -7V ≤ VY or VZ ≤ 12V, (Note 4)
0V ≤ VO ≤ VCC
Full
Full
Full
-
35
7
1 50 nA
- 250 mA
- 85 mA
Driver Input to Output Delay
tPLH, tPHL RDIFF = 54Ω, CL = 100pF, (Figure 2)
Driver Output Skew
tSKEW RDIFF = 54Ω, CL = 100pF, (Figure 2)
Driver Differential Rise or Fall Time tR, tF RDIFF = 54Ω, CL = 100pF, (Figure 2)
Driver Enable to Output High
tZH CL = 100pF, SW = GND, (Figure 3)
Driver Enable to Output Low
tZL CL = 100pF, SW = VCC, (Figure 3)
Driver Disable from Output High
tHZ CL = 15pF, SW = GND, (Figure 3)
Driver Disable from Output Low
tLZ CL = 15pF, SW = VCC, (Figure 3)
Receiver Input to Output Delay
tPLH, tPHL (Figure 4)
Receiver Skew | tPLH - tPHL |
tSKD (Figure 4)
Receiver Enable to Output High
tZH CL = 15pF, SW = GND, (Figure 5)
Receiver Enable to Output Low
tZL CL = 15pF, SW = VCC, (Figure 5)
Receiver Disable from Output High tHZ CL = 15pF, SW = GND, (Figure 5)
Receiver Disable from Output Low
tLZ CL = 15pF, SW = VCC, (Figure 5)
Maximum Data Rate
fMAX
SWITCHING CHARACTERISTICS (ISL8487, ISL81483)
Full 18 24 50 ns
Full -
2 10 ns
Full 3
12 25 ns
Full -
14 70 ns
Full -
14 70 ns
Full -
44 70 ns
Full -
21 70 ns
Full 30
90 150 ns
25 - 5 - ns
Full -
9 50 ns
Full -
9 50 ns
Full -
9 50 ns
Full -
9 50 ns
Full 5 - - Mbps
Driver Input to Output Delay
tPLH, tPHL RDIFF = 54Ω, CL = 100pF, (Figure 2)
Driver Output Skew
tSKEW RDIFF = 54Ω, CL = 100pF, (Figure 2)
Driver Differential Rise or Fall Time tR, tF RDIFF = 54Ω, CL = 100pF, (Figure 2)
Driver Enable to Output High
tZH CL = 100pF, SW = GND, (Figure 3, Note 5)
Driver Enable to Output Low
tZL CL = 100pF, SW = VCC, (Figure 3, Note 5)
Driver Disable from Output High
tHZ CL = 15pF, SW = GND, (Figure 3)
Driver Disable from Output Low
tLZ CL = 15pF, SW = VCC, (Figure 3)
Receiver Input to Output Delay
tPLH, tPHL (Figure 4)
Receiver Skew | tPLH - tPHL |
tSKD (Figure 4)
Receiver Enable to Output High
tZH CL = 15pF, SW = GND, (Figure 5, Note 6)
Receiver Enable to Output Low
tZL CL = 15pF, SW = VCC, (Figure 5, Note 6)
Receiver Disable from Output High tHZ CL = 15pF, SW = GND, (Figure 5)
Receiver Disable from Output Low
tLZ CL = 15pF, SW = VCC, (Figure 5)
Maximum Data Rate
fMAX
Time to Shutdown
tSHDN (Note 7)
Full 250 650 2000 ns
Full - 160 800 ns
Full 250 900 2000 ns
Full 250 1000 2000 ns
Full 250 860 2000 ns
Full 300 660 3000 ns
Full 300 640 3000 ns
Full 250 500 2000 ns
25 - 60 - ns
Full -
10 50 ns
Full -
10 50 ns
Full -
10 50 ns
Full -
10 50 ns
Full 250
-
- kbps
Full 50 120 600 ns
5
5 Page 
ISL8487, ISL81483, ISL81487
Typical Performance Curves VCC = 5V, TA = 25oC, ISL8487, ISL81483 and ISL81487; Unless Otherwise Specified (Continued)
DI
5
RO
0
RDIFF = 54Ω, CL = 100pF
5
0
DI
5
RO
0
RDIFF = 54Ω, CL = 100pF
5
0
4
B/Z
3
2 A/Y
1
0
TIME (400ns/DIV)
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL8487, ISL81483)
4
A/Y
3
2 B/Z
1
0
TIME (400ns/DIV)
FIGURE 15. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL8487, ISL81483)
DI
5
RO
0
RDIFF = 54Ω, CL = 100pF
5
0
4
B/Z
3
2 A/Y
1
0
TIME (20ns/DIV)
FIGURE 16. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL81487)
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND
TRANSISTOR COUNT:
518
PROCESS:
Si Gate CMOS
DI
5
RO
0
RDIFF = 54Ω, CL = 100pF
5
0
4
3 A/Y
2 B/Z
1
0
TIME (20ns/DIV)
FIGURE 17. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL81487)
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL8487.PDF ] | |
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