ایزولاتور ایزولاتور دیجیتال

Product Attributes

Introduction

The ISO7240, ISO7241 and ISO7242 are quad-channel digital isolators with multiple channel configurations and output enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide (SiO₂) isolation barrier. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO7240 has all four channels in the same direction while the ISO7241 has three channels the same direction and one channel in opposition. The ISO7242 has two channels in each direction.

The C option devices have TTL input thresholds and a noise-filter at the input that prevents transient pulses from being passed to the output of the device. The M option devices have CMOS Vcc/2 input thresholds and do not have the input noise-filter or the additional propagation delay.

The ISO7240CF has an input disable function on pin 7, and a selectable high or low failsafe-output function with the CTRL pin (pin 10). The failsafe-output is a logic high when a logic-high is placed on the CTRL pin or it is left unconnected. If a logic-low signal is applied to the CTRL pin, the failsafe-output becomes a logic-low output state. The ISO7240CF input disable function prevents data from being passed across the isolation barrier to the output. When the inputs are disabled, the outputs are set by the CTRL pin.

These devices may be powered from 2.8-V (ISO7241C only), 3.3-V or 5-V supplies on either side in any combination. Note that the signal input pins are 5-V tolerant regardless of the voltage supply level being used.

Features

• Selectable Failsafe Output (ISO7240CF)
• 25 and 150-Mbps Signaling Rate Options
• Low Channel-to-Channel Output Skew; 1 ns Max
• Low Pulse-Width Distortion (PWD); 2 ns Max
• Low Jitter Content; 1 ns Typ at 150 Mbp
• Typical 25-Year Life at Rated Working Voltage
• 4000-Vpeak VIOTM, 560-Vpeak VIORM per IEC 60747- 5-2 (VDE 0884, Rev 2)
• UL 1577, IEC 61010-1, IEC 60950-1 and CSA Approved
• 4 kV ESD Protection
• Operates With 2.8-V (ISO7241C), 3.3-V or 5-V Supplies
• High Electromagnetic Immunity
• -40°C to 125°C Operating Range

Applications

• Industrial Fieldbus
• Computer Peripheral Interface
• Servo Control Interface
• Data Acquisition