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PDF ISL81487E Data sheet ( Hoja de datos )
| Número de pieza | ISL81487E | |
| Descripción | 15kV ESD Protected/ 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ISL8487E, ISL81487L, ISL81487E
December 2003
FN6051.2
±15kV ESD Protected, 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 ESD protected,
fractional unit load (UL), BiCMOS, 5V powered, single
transceivers that meet both the RS-485 and RS-422
standards for balanced communication. Each driver output/
receiver input is protected against ±15kV ESD strikes,
without latch-up. Unlike competitive devices, this Intersil
family is specified for 10% tolerance supplies (4.5V to 5.5V).
All devices 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). 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 ISL8487E and ISL81487L
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
ISL81487E, 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
• RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Fractional Unit Load Allows up to 256 Devices on the Bus
• Specified for 10% Tolerance Supplies
• High Data Rate Version (ISL81487E) . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission (ISL8487E, ISL81487L) . . . . .up to 250kbps
• Low Current Shutdown Mode (Except ISL81487E). . . . 1nA
• Low Quiescent Supply Current:
- ISL8487E, ISL81487L . . . . . . . . . . . . . . . 120µA (Max.)
- ISL81487E . . . . . . . . . . . . . . . . . . . . . . . . 300µA (Max.)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 30ns Propagation Delays, 5ns Skew (ISL81487E)
• Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Pin Compatible Replacements for: MAX487E,
(ISL8487E); LTC1487, ADM1487 (ISL81487L);
MAX1487E, ST485ER (ISL81487E)
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
ISL8487E
HALF/FULL NO. OF DEVICES DATA RATE SLEW-RATE
RECEIVER/
QUIESCENT LOW POWER PIN
DUPLEX ALLOWED ON BUS (Mbps)
LIMITED? DRIVER ENABLE? ICC (µA) SHUTDOWN? COUNT
Half 256 0.25 Yes Yes 100 Yes 8
ISL81487L
Half
256 0.25 Yes
Yes 100 Yes 8
ISL81487E
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  
ISL8487E, ISL81487L, ISL81487E
Electrical Specifications
Test Conditions: VCC
Typicals are at VCC =
= 4.5V
5V, TA
to
=
5.5V;
25oC,
Unless Otherwise Specified.
(Note 2) (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(oC)
No-Load Supply Current, (Note 3)
ICC ISL81487E, DI, RE = 0V DE = VCC
or VCC
DE = 0V
Full
Full
ISL8487E, ISL81487L, DE = VCC
DI, RE = 0V or VCC
DE = 0V
Full
Full
Shutdown Supply Current
ISHDN (Note 7), DE = 0V, RE = VCC, DI = 0V or VCC
Driver Short-Circuit Current,
VO = High or Low
IOSD1 DE = VCC, -7V ≤ VY or VZ ≤ 12V, (Note 4)
Receiver Short-Circuit Current
IOSR 0V ≤ VO ≤ VCC
SWITCHING CHARACTERISTICS (ISL81487E)
Full
Full
Full
Driver Input to Output Delay
tPLH, tPHL
Driver Output Skew
tSKEW
Driver Differential Rise or Fall Time tR, tF
Driver Enable to Output High
tZH
Driver Enable to Output Low
tZL
Driver Disable from Output High
tHZ
Driver Disable from Output Low
tLZ
Receiver Input to Output Delay
tPLH, tPHL
Receiver Skew | tPLH - tPHL |
tSKD
Receiver Enable to Output High
tZH
Receiver Enable to Output Low
tZL
Receiver Disable from Output High
tHZ
Receiver Disable from Output Low
tLZ
Maximum Data Rate
fMAX
SWITCHING CHARACTERISTICS (ISL8487E)
RDIFF = 54Ω, CL = 100pF, (Figure 2)
RDIFF = 54Ω, CL = 100pF, (Figure 2)
RDIFF = 54Ω, CL = 100pF, (Figure 2)
CL = 100pF, SW = GND, (Figure 2)
CL = 100pF, SW = VCC, (Figure 2)
CL = 15pF, SW = GND, (Figure 2)
CL = 15pF, SW = VCC, (Figure 2)
(Figure 4)
(Figure 4)
CL = 15pF, SW = GND, (Figure 5)
CL = 15pF, SW = VCC, (Figure 5)
CL = 15pF, SW = GND, (Figure 5)
CL = 15pF, SW = VCC, (Figure 5)
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
Full
Full
Driver Input to Output Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
Receiver Skew | tPLH - tPHL |
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
Time to Shutdown
Driver Enable from Shutdown to
Output High
tPLH, tPHL
tSKEW
tR, tF
tZH
tZL
tHZ
tLZ
tPLH, tPHL
tSKD
tZH
tZL
tHZ
tLZ
fMAX
tSHDN
tZH(SHDN)
RDIFF = 54Ω, CL = 100pF, (Figure 2)
RDIFF = 54Ω, CL = 100pF, (Figure 2)
RDIFF = 54Ω, CL = 100pF, (Figure 2)
CL = 100pF, SW = GND, (Figure 3, Note 5)
CL = 100pF, SW = VCC, (Figure 3, Note 5)
CL = 15pF, SW = GND, (Figure 3)
CL = 15pF, SW = VCC, (Figure 3)
(Figure 4)
(Figure 4)
CL = 15pF, SW = GND, (Figure 5, Note 6)
CL = 15pF, SW = VCC, (Figure 5, Note 6)
CL = 15pF, SW = GND, (Figure 5)
CL = 15pF, SW = VCC, (Figure 5)
(Note 7)
CL = 100pF, SW = GND, (Figure 3, Notes 7, 8)
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
Full
Full
Full
Full
Driver Enable from Shutdown to
Output Low
tZL(SHDN) CL = 100pF, SW = VCC, (Figure 3, Notes 7, 8)
Full
MIN
-
-
-
-
-
35
7
18
-
3
-
-
-
-
30
-
-
-
-
-
5
250
-
250
250
250
300
300
250
-
-
-
-
-
250
50
-
-
TYP
300
250
150
100
1
-
-
24
3
12
14
14
44
21
90
5
9
9
9
9
-
650
160
900
1000
860
660
640
500
60
10
10
10
10
-
120
1000
1000
MAX
500
300
200
120
50
250
UNITS
µA
µA
µA
µA
nA
mA
85 mA
50 ns
10 ns
25 ns
70 ns
70 ns
70 ns
70 ns
150 ns
- ns
50 ns
50 ns
50 ns
50 ns
- Mbps
2000
800
2000
2000
2000
3000
3000
2000
-
50
50
50
50
-
600
2000
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
2000 ns
5
5 Page 
ISL8487E, ISL81487L, ISL81487E
Typical Performance Curves VCC = 5V, TA = 25oC, ISL8487E, ISL81487L and ISL81487E;
Unless Otherwise Specified (Continued)
750 250
700
tPLHY
tPLHZ
650
600
tPHLY
550
tPHLZ
500
450
-40
-25
0 25 50
TEMPERATURE (oC)
FIGURE 10. DRIVER PROPAGATION DELAY vs
TEMPERATURE (ISL8487E, ISL81487L)
75 85
200
|tPLHY - tPHLZ|
150
|tPHLY - tPLHZ|
100
50
|CROSS PT. OF Y↑ & Z↓ - CROSS PT. OF Y↓ & Z↑|
0
-40 -25
0 25 50
TEMPERATURE (oC)
75 85
FIGURE 11. DRIVER SKEW vs TEMPERATURE
(ISL8487E, ISL81487L)
30
28
26
24
tPLHY
22
tPLHZ
20
tPHLZ
18
tPHLY
16
-40
-25
0 25 50
TEMPERATURE (oC)
FIGURE 12. DRIVER PROPAGATION DELAY vs
TEMPERATURE (ISL81487E)
75 85
5
4
|tPHLY - tPLHZ|
3
|tPLHY - tPHLZ|
2
1
|CROSSING PT. OF Y↑ & Z↓ - CROSSING PT. OF Y↓ & Z↑|
0
-40
-25
0 25 50
TEMPERATURE (oC)
FIGURE 13. DRIVER SKEW vs TEMPERATURE
(ISL81487E)
75 85
DI
5
RO
0
5
RDIFF = 54Ω, CL = 100pF 0
ISL81487L
5
RO
0
ISL8487E
4
B/Z
3
2 A/Y
1
0
TIME (400ns/DIV)
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL8487E, ISL81487L)
11
5
DI RDIFF = 54Ω, CL = 100pF
0
5
RO ISL81487L
0
5
RO
0
ISL8487E
4
A/Y
3
2 B/Z
1
0
TIME (400ns/DIV)
FIGURE 15. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL8487E, ISL81487L)
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ISL81487E.PDF ] | |
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