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ISL81487L の電気的特性と機能

ISL81487LのメーカーはIntersil Corporationです、この部品の機能は「15kV ESD Protected/ 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL81487L
部品説明 15kV ESD Protected/ 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL81487L Datasheet, ISL81487L PDF,ピン配置, 機能
®
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





ISL81487L pdf, ピン配列
ISL8487E, ISL81487L, ISL81487E
Typical Operating Circuits
ISL8487E, ISL81487L, ISL81487E
+5V
+
0.1µF
8
VCC
1 RO R
2 RE
B/Z 7
RT
3 DE
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
GND
5
RO 1
3


3Pages


ISL81487L 電子部品, 半導体
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) MIN TYP MAX UNITS
Receiver Enable from Shutdown to tZH(SHDN) CL = 15pF, SW = GND, (Figure 5, Notes 7, 9)
Full
-
800 2500 ns
Output High
Receiver Enable from Shutdown to tZL(SHDN) CL = 15pF, SW = VCC, (Figure 5, Notes 7, 9) Full - 800 2500 ns
Output Low
SWITCHING CHARACTERISTICS (ISL81487L)
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 = 54, CL = 100pF, (Figure 2)
RDIFF = 54, CL = 100pF, (Figure 2)
RDIFF = 54, 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
150 650 1200 ns
- 160 600 ns
250 900 1200 ns
100 1000 1500 ns
100 1000 1500 ns
150 750 1500 ns
150 750 1500 ns
30 175 250 ns
- 13 - ns
- 10 50 ns
- 10 50 ns
- 10 50 ns
- 10 50 ns
250 -
- kbps
50 140 600 ns
- 1100 2000 ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN) CL = 100pF, SW = VCC, (Figure 3, Notes 7, 8)
Full
- 1000 2000 ns
Receiver Enable from Shutdown to tZH(SHDN) CL = 15pF, SW = GND, (Figure 5, Notes 7, 9)
Full
-
900 2000 ns
Output High
Receiver Enable from Shutdown to tZL(SHDN) CL = 15pF, SW = VCC, (Figure 5, Notes 7, 9) Full - 900 2000 ns
Output Low
ESD PERFORMANCE
RS-485 Pins (A/Y, B/Z)
Human Body Model
25 - ±15 - kV
All Other Pins
25 - >±7 - kV
NOTES:
2. Currents into device pins are positive; currents out of device pins are negative. Voltages are referenced to ground unless otherwise specified.
3. Supply current specification is valid for loaded drivers when DE = 0V.
4. Applies to peak current. See “Typical Performance Curves” for more information.
5. When testing the ISL8487E and ISL81487L, keep RE = 0 to prevent the device from entering SHDN.
6. When testing the ISL8487E and ISL81487L, the RE signal high time must be short enough (typically <200ns) to prevent the device from entering
SHDN.
7. The ISL8487E and ISL81487L are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, 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” section.
8. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN.
9. Set the RE signal high time >600ns to ensure that the device enters SHDN.
10. Devices meeting these limits are denoted as “1/8 unit load (1/8 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus,
so there can be 256 1/8 UL devices on a bus.
6

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共有リンク

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部品番号部品説明メーカ
ISL81487

1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers

Intersil Corporation
Intersil Corporation
ISL81487E

15kV ESD Protected/ 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers

Intersil Corporation
Intersil Corporation
ISL81487L

15kV ESD Protected/ 1/8 Unit Load/ 5V/ Low Power/ High Speed or Slew Rate Limited/ RS-485/RS-422 Transceivers

Intersil Corporation
Intersil Corporation


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