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參數(shù)資料
| 型號(hào)： | ISL32483EIBZ-T7A |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 4/17頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485 FAULT PROT 14SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)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： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
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ISL32483E, ISL32485E
12
FN7785.1
March 27, 2012
Proper termination is imperative to minimize reflections, and
terminations are recommended unless power dissipation is an
overriding concern. In point-to-point, or point-to-multipoint (single
driver on bus like RS-422) networks, the main cable should be
terminated in its characteristic impedance (typically 120) 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
transceivers meet this requirement via driver output short circuit
current limits and on-chip thermal shutdown circuitry.
The driver output stages incorporate a double foldback, short
circuit current limiting scheme, which ensures that the output
current never exceeds the RS-485 specification, even at the
common mode and fault condition voltage range extremes. The
first foldback current level (≈70mA) is set to ensure that the
driver never folds back when driving loads with common mode
voltages up to ±25V. The very low second foldback current
setting (≈9mA) minimizes power dissipation if the Tx is enabled
when a fault occurs.
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 BiCMOS transceivers all use a fraction of the power
required by competitive devices, but they also include a
shutdown feature (except the ISL32485E) that reduces the
already low quiescent ICC to a 10A 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
and 13, at the end of “Electrical Specifications” on page 5, for
more information.
Typical Performance Curves V
CC = 5V, TA = +25°C; Unless Otherwise Specified.
FIGURE 10. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT
VOLTAGE
FIGURE 11. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIV
E
R
OUTPUT
CURRENT
(
m
A)
01
234
5
0
10
20
30
40
50
60
70
80
90
+25°C
RD = 54
RD = 100
RD = 30
RD = 20
+85°C
-40
0
50
85
TEMPERATURE (°C)
DIF
F
E
R
E
N
TIAL
OUTPUT
V
O
LT
AGE
(V
)
-25
25
75
RD = 54
RD = 100
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL32485E | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Fault Protected, Extended CMR, RS-485/RS-422 Transceivers |
| ISL32485EIBZ | 功能描述:IC TXRX RS485 FAULT PROT 8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 產(chǎn)品目錄頁(yè)面:1402 (CN2011-ZH PDF) |
| ISL32485EIBZ-T | 功能描述:IC TXRX RS485 FAULT PROT 8SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:發(fā)射器 驅(qū)動(dòng)器/接收器數(shù):4/0 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| ISL32485EIBZ-T7A | 功能描述:RS-422/RS-485 接口 IC 8LD OVP -40+85 5V PO LARITY REV 1/2 DUP RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| ISL32490E | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:±60V Fault Protected, 5V, RS-485/RS-422 Transceivers with ±25V CMR |
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