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ISL3330 PDF预览

ISL3330

更新时间: 2024-11-13 11:54:51
品牌 Logo 应用领域
英特矽尔 - INTERSIL /
页数 文件大小 规格书
25页 945K
描述
3.3V, ±15kV ESD Protected, Dual Protocol RS-232/RS-485 Transceivers

ISL3330 数据手册

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ISL3330, ISL3331  
®
Data Sheet  
May 20, 2008  
FN6361.0  
3.3V, ±15kV ESD Protected, Dual Protocol  
Features  
(RS-232/RS-485) Transceivers  
• User Selectable RS-232 or RS-485/RS-422 Interface Port  
(Two RS-232 Transceivers or One RS-485/RS-422  
Transceiver)  
These devices are BiCMOS interface ICs that are user  
configured as either a single RS-422/RS-485 differential  
transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver.  
• Operates From a Single 3.3V Supply  
In RS-232 mode, the on-board charge pump generates  
RS-232 compliant ±5V Tx output levels, from a supply as low  
as 3.15V. Four small 0.1µF capacitors are required for the  
charge pump. The transceivers are RS-232 compliant, with  
the Rx inputs handling up to ±25V.  
• ±15kV (HBM) ESD Protected Bus Pins (RS-232 or  
RS-485)  
• 5V Tolerant Logic Inputs  
• True Flow-Through Pinouts Simplify Board Layouts  
• Pb-Free (RoHS Compliant)  
In RS-485 mode, the transceivers support both the RS-485  
and RS-422 differential communication standards. The  
RS-485 receiver features "full failsafe" operation, so the Rx  
output remains in a high state if the inputs are open or  
shorted together. The RS-485 transmitter supports up to  
three data rates, two of which are slew rate limited for  
problem free communications. The charge pump disables in  
RS-485 mode, thereby saving power, minimizing noise, and  
eliminating the charge pump capacitors.  
• Full Failsafe (Open/Short) Rx in RS-485/RS-422 Mode  
• Loopback Mode Facilitates Board Self Test Functions  
• User Selectable RS-485 Data Rates . . . . . . . . . . 20Mbps  
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps  
- Slew Rate Limited (ISL3331 Only) . . . . . . . . . . 115kbps  
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps  
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . 30µA  
• QFN Package Saves Board Space (ISL3331 Only)  
Both RS-232/RS-485 modes feature loopback and shutdown  
functions. The loopback mode internally connects the Tx  
outputs to the corresponding Rx input, which facilitates the  
implementation of board level self test functions. The outputs  
remain connected to the loads during loopback, where  
connection problems (e.g., shorted connectors or cables)  
can be detected. The shutdown mode disables the Tx and  
Rx outputs, disables the charge pump if in RS-232 mode,  
and places the IC in a low current (30µA) mode.  
• Logic Supply Pin (V ) Eases Operation in Mixed Supply  
L
Systems (ISL3331 Only)  
Applications  
• Gaming Applications (e.g., Slot machines)  
• Single Board Computers  
• Factory Automation  
The ISL3331 is a QFN packaged device that offers  
additional functionality, including a lower speed and edge  
rate option (115kbps) for EMI sensitive designs, or to allow  
longer bus lengths. It also features a logic supply voltage pin  
• Security Networks  
• Industrial/Process Control Networks  
• Level Translators (e.g., RS-232 to RS-422)  
• Point of Sale Equipment  
(V ) that sets the V  
level of logic outputs, and the  
L
OH  
switching points of logic inputs, to be compatible with  
another supply voltage in mixed voltage systems. The QFN's  
choice of active high or low Rx enable pins increases design  
flexibility, allowing Tx/Rx direction control via a single signal  
by connecting DEN and RXEN together.  
Related Literature  
• Application Note AN1401 “Implementing a Three Pin,  
Half-Duplex, Dual Protocol Interface”  
For a dual port version of these devices, please see the  
ISL3332/ISL3333 data sheet.  
TABLE 1. SUMMARY OF FEATURES  
PART  
NUMBER  
NO. OF  
PORTS  
RS-485 DATA  
RATE (bps)  
RS-232 DATA  
RATE (kbps)  
ACTIVE H or L  
Rx ENABLE?  
LOW POWER  
SHUTDOWN?  
PACKAGE OPTIONS  
V
PIN?  
L
ISL3330  
ISL3331  
1
1
20 Ld SSOP  
20M, 460k  
400  
400  
No  
H
Yes  
Yes  
40 Ld QFN (6mmx6mm) 20M, 460k, 115k  
Yes  
Both  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright © Intersil Americas Inc. 2008. All Rights Reserved.  
1
All other trademarks mentioned are the property of their respective owners.  

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