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參數(shù)資料
| 型號： | ISL83088EIUZ-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 4/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | TXRX ESD RS-485/422 5V 8-MSOP |
| 產(chǎn)品培訓模塊： | Solutions for Industrial Control Applications |
| 標準包裝： | 1 |
| 類型： | 收發(fā)器 |
| 驅動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 標準包裝 |
| 其它名稱： | ISL83088EIUZ-TDKR |
12
FN6085.9
April 22, 2008
115kbps versions need not be terminated, but, terminations
are recommended unless power dissipation is an overriding
concern.
In point-to-point, or point-to-multipoint (single driver on bus)
networks, the main cable should be terminated in its
characteristic impedance (typically 120
Ω) at the end farthest
from the driver. In multi-receiver applications, stubs
connecting receivers to the main cable should be kept as
short as possible. Multipoint (multi-driver) systems require
that the main cable be terminated in its characteristic
impedance at both ends. Stubs connecting a transceiver to
the main cable should be kept as short as possible.
Built-In Driver Overload Protection
As stated previously, the RS-485 specification requires that
drivers survive worst case bus contentions undamaged.
These devices meet this requirement via driver output short
circuit current limits, and on-chip thermal shutdown circuitry.
The driver output stages incorporate short circuit current
limiting circuitry which ensures that the output current never
exceeds the RS-485 specification, even at the common
mode voltage range extremes. Additionally, these devices
utilize a foldback circuit which reduces the short circuit
current, and thus the power dissipation, whenever the
contending voltage exceeds either supply.
In the event of a major short circuit condition, devices also
include a thermal shutdown feature that disables the drivers
whenever the die temperature becomes excessive. This
eliminates the power dissipation, allowing the die to cool. The
drivers automatically re-enable after the die temperature
drops about +15°C. If the contention persists, the thermal
shutdown/re-enable cycle repeats until the fault is cleared.
Receivers stay operational during thermal shutdown.
Low Power Shutdown Mode
These CMOS transceivers all use a fraction of the power
required by their bipolar counterparts, but they also include a
shutdown feature (except for the ISL83084E) that reduces
the already low quiescent ICC to a 70nA trickle. These
devices enter shutdown whenever the receiver and driver
are simultaneously disabled (RE =VCC and DE = GND) for
a period of at least 600ns. Disabling both the driver and the
receiver for less than 60ns guarantees that the transceiver
will not enter shutdown.
Note that receiver and driver enable times increase when
the transceiver enables from shutdown. Refer to Notes 8
thru 12, at the end of the “Electrical Specification Table” on
page 8, for more information.
Typical Performance Curves VCC = 5V, TA = +25°C; Unless Otherwise Specified
FIGURE 8. DRIVER OUTPUT CURRENT vs DIFFERENTIAL
OUTPUT VOLTAGE
FIGURE 9. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIVER
OUTPUT
CUR
RE
NT
(mA)
01234
5
0
10
20
30
40
50
60
70
80
90
-40
0
50
85
TEMPERATURE (°C)
D
IFFERENTIAL
OUTPUT
VOL
T
AGE
(V)
-25
25
75
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
RDIFF = 54Ω
RDIFF = 100Ω
ISL83080E, ISL83082E, ISL83083E, ISL83084E, ISL83085E, ISL83086E, ISL83088E
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