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參數(shù)資料
| 型號(hào)： | ISL3178AEMBZ-T |
| 廠商： | Intersil |
| 文件頁數(shù)： | 13/14頁 |
| 文件大小： | 0K |
| 描述： | TXRX ESD 3.3V RS485/422 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | 3 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
8
FN6887.2
December 2, 2013
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a
point-to-multipoint (multidrop) standard, which allows only one
driver and up to 10 (assuming one unit load devices) receivers
on each bus. RS-485 is a true multipoint standard, which allows
up to 32 one-unit load devices (any combination of drivers and
receivers) on each bus. To allow for multipoint operation, the
RS-485 spec requires that drivers must handle bus contention
without sustaining any damage.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for long runs,
thus the wide CMR is necessary to handle ground potential
differences, as well as voltages induced in the cable by
external fields.
Receiver Features
This device utilizes a differential input receiver for maximum
noise immunity and common mode rejection. The Input
sensitivity is better than ±200mV, as required by the RS-422
and RS-485 specifications.
Receiver input resistance of 96k
Ω surpasses the RS-422
spec of 4k
Ω and is eight times the RS-485 “Unit Load (UL)”
requirement of 12k
Ω minimum. Thus, these products are
known as “one-eighth UL” transceivers and there can be up
to 256 of these devices on a network while still complying
with the RS-485 loading specification.
Receiver inputs function with common mode voltages as great
as +9V/-7V outside the power supplies (i.e., +12V and -7V),
making them ideal for long networks where induced voltages
and ground potential differences are realistic concerns.
All the receivers include a “Full Fail-Safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating) or shorted. Fail-safe with shorted
inputs is achieved by setting the Rx upper switching point to
-50mV, thereby ensuring that the Rx sees 0V differential as a
high input level.
Receivers easily meet the data rates supported by the
corresponding driver, and all receiver outputs are tri-statable
via the active low RE input.
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER PROPAGATION DELAY
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES
Test Circuits and Waveforms (Continued)
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
+1.5V
-1.5V
tPLH
0V
VCC
0V
1.5V
tPHL
A
1k
Ω
VCC
GND
SW
PARAMETER
DE
A
SW
tHZ
X
+1.5V
GND
tLZ
X
-1.5V
VCC
0
+1.5V
GND
0
-1.5V
VCC
0
+1.5V
GND
0
-1.5V
VCC
SIGNAL
GENERATOR
R
RO
RE
A
B
GND
15pF
RO
3V
0V
1.5V
VOH
0V
1.5V
VOH - 0.25V
tHZ
RO
VCC
VOL
1.5V
VOL + 0.25V
tLZ
RE
OUTPUT HIGH
OUTPUT LOW
tZL, tZL(SHDN)
tZH, tZH(SHDN)
NOTE 11
ISL3178AE
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL3178AEMW | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:±15kV ESD Protected, 3.3V, Full Fail-Safe, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers |
| ISL3178E | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:RS-485/RS-422 Transceivers |
| ISL3178EIBZ | 功能描述:RS-422/RS-485 接口 IC 8LD -40+85 3V RS-485 1/2 DUP 10M 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 |
| ISL3178EIBZ-T | 功能描述:TXRX ESD 3.3V RS-485/422 8-SOIC 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:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| ISL3178EIBZ-T7A | 功能描述:IC TXRX RS485/422 ESD 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) |
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