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ISL81485IBZ PDF预览

ISL81485IBZ

更新时间： 2024-02-20 16:15:32
品牌 Logo 应用领域
英特矽尔 - INTERSIL 驱动器接口集成电路光电二极管信息通信管理
页数 文件大小 规格书
11页 378K
描述
5V, 30Mbps, RS-485/RS-422 Transceiver

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ISL81485IBZ 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：TSSOP
包装说明：TSSOP, TSSOP8,.19针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.63
差分输出：YES驱动器位数：1
高电平输入电流最大值：0.000001 A输入特性：DIFFERENTIAL SCHMITT TRIGGER
接口集成电路类型：LINE TRANSCEIVER接口标准：EIA-422; EIA-485
JESD-30 代码：S-PDSO-G8JESD-609代码：e3
长度：3 mm湿度敏感等级：2
功能数量：1端子数量：8
最高工作温度：85 °C最低工作温度：-40 °C
最小输出摆幅：1.5 V最大输出低电流：0.004 A
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装等效代码：TSSOP8,.19封装形状：SQUARE
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：260
电源：5 V认证状态：Not Qualified
最大接收延迟：30 ns接收器位数：1
座面最大高度：1.1 mm子类别：Line Driver or Receivers
最大压摆率：2.2 mA最大供电电压：5.5 V
最小供电电压：4.5 V标称供电电压：5 V
表面贴装：YES技术：BICMOS
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn) - annealed
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
最大传输延迟：15 ns宽度：3 mm
Base Number Matches：1

ISL81485IBZ 数据手册

 浏览型号ISL81485IBZ的Datasheet PDF文件第4页浏览型号ISL81485IBZ的Datasheet PDF文件第5页浏览型号ISL81485IBZ的Datasheet PDF文件第6页浏览型号ISL81485IBZ的Datasheet PDF文件第8页浏览型号ISL81485IBZ的Datasheet PDF文件第9页浏览型号ISL81485IBZ的Datasheet PDF文件第10页 
ISL81485  
Proper termination is imperative, when using a 30Mbps  
Driver Features  
device, to minimize reflections. In point-to-point, or point-to-  
multipoint (single driver on bus) networks, the main cable  
should be terminated in its characteristic impedance  
(typically 120Ω) 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.  
The RS-485, RS-422 driver is a differential output device that  
delivers at least 2V across a 54Ω load (RS-485), and at least  
2.5V across a 100Ω load (RS-422) even with V  
= 4.5V.  
CC  
The drivers feature low propagation delay skew to maximize  
bit width, and to minimize EMI.  
The driver is three-statable via the active high DE input.  
Outputs of the driver are not slew rate limited, so faster  
output transition times allow data rates of at least 30Mbps.  
Data Rate, Cables, and Terminations  
Built-In Driver Overload Protection  
RS-485/RS-422 are intended for network lengths up to  
4000’, but the maximum system data rate decreases as the  
transmission length increases. Devices operating at 30Mbps  
usually are limited to lengths of a couple hundred feet, but  
the larger differential output voltage of this transceiver allows  
that distance to be pushed past 350’. Figure 7 illustrates the  
30Mbps performance of the ISL81485 driving 350’ of CAT5  
cable, terminated in 120Ω at both the driver and receiver  
ends. As shown, the differential signal (A-B) delivered to the  
receiver inputs at the end of the cable is still greater than  
1.5V (i.e., 7.5 times the required Rx sensitivity). Thus, even  
longer cables can be driven if lower noise margins are  
acceptable.  
As stated previously, the RS-485 spec requires that drivers  
survive worst case bus contentions undamaged. The  
ISL81485 meets 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 spec, even at the common mode  
voltage range extremes.  
In the event of a major short circuit condition, the device also  
includes 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 reenable after the die temperature  
drops about 15 degrees. If the contention persists, the  
thermal shutdown/reenable cycle repeats until the fault is  
cleared. Receivers stay operational during thermal  
shutdown.  
Twisted pair is the cable of choice for RS-485, RS-422  
networks. Twisted pair cables tend to pick up noise and other  
electromagnetically induced voltages as common mode  
signals, which are effectively rejected by the differential  
receivers in these ICs.  
o
Typical Performance Curves V = 5V, T = 25 C; Unless Otherwise Specified  
CC  
A
160  
140  
120  
100  
80  
DI = 30Mbps  
5
0
Y OR Z = LOW  
5
0
60  
RO  
40  
20  
0
DRIVER+CABLE DELAY (~490ns)  
-20  
-40  
3
1.5  
0
Y OR Z = HIGH  
-60  
-80  
A - B  
-100  
-120  
-140  
-1.5  
-3  
-160  
-7 -6  
-4  
-2  
0
2
4
6
8
10  
12  
TIME (20ns/DIV)  
OUTPUT VOLTAGE (V)  
FIGURE 7. DRIVER AND RECEIVER WAVEFORMS DRIVING  
350 FEET (107 METERS) OF CAT5 CABLE  
(DOUBLE TERMINATED WITH 120Ω)  
FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT  
VOLTAGE  
7
1...4567891011

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