Part Number: ISO7221BDR

Manufacturer: Texas Instruments

Description: Digital Isolators Dual Channel High Spd Digital Isolator

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Technical Specifications of ISO7221BDR

Datasheet  ISO7221BDR datasheet
Category Isolators
Family Digital Isolators
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Technology Capacitive Coupling
Type General Purpose
Isolated Power No
Number of Channels 2
Inputs – Side 1/Side 2 1/1
Channel Type Unidirectional
Voltage – Isolation 2500Vrms
Common Mode Transient Immunity (Min) 25kV/μs
Data Rate 5Mbps
Propagation Delay tpLH / tpHL (Max) 70ns, 70ns
Pulse Width Distortion (Max) 3ns
Rise / Fall Time (Typ) 1ns, 1ns
Voltage – Supply 3 V ~ 5.5 V
Operating Temperature -40°C ~ 125°C
Package / Case 8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SOIC

ISO7221BDR Description

Digital isolators from the ISO7220x and ISO7221x families are two-channel devices. To facilitate PCB layout, the channels are aligned similarly for the ISO7220x and in the opposite direction for the ISO7221x. TI’s silicon dioxide (SiO2) insulation barrier separates the logic input buffer from the output buffer in these devices, providing galvanic isolation of up to 4000 VPK per VDE. To safeguard sensitive equipment against noise currents on data buses or other circuits, these devices can be used with isolated power supplies to withstand high voltage, isolate grounds, and prevent damage.

Input binary signal is conditioned, a balanced signal is generated, and finally, a signal is distinguished by capacitive insulation. The differential comparator then uses this data to either set the flip-flop and the output circuit or reset it. A “refresh pulse” is transmitted across the gap at regular intervals to keep the DC output at the proper voltage. Failure to receive this DC refresh pulse every 4 s triggers the failsafe circuit, which raises the output to a logic high state to indicate that the input is either not being used or is not receiving power. This series of devices functions quickly due to its small capacitance and, by extension, its resultant time constant, which allows for signalling rates ranging from 0 Mbps to 150 Mbps.

A, B, and C options all feature TTL input thresholds and an input noise filter to prevent transient pulses from reaching the device’s output. The input noise filter and extra propagation delay are not included in the M-option devices, and the CMOS VCC/2 thresholds are standard. Devices in the ISO7220x and ISO7221x families need two power inputs of 2.8 V (C-Grade), 3.3 V, or 5 V. All of the outputs are CMOS and can handle 4 mA at 5 V, even when powered by a 2.8 V or 3.3 V source. These gadgets have been certified for use between -40 and +125 degrees Celsius.

ISO7221BDR Features

  • With support for signalling rates of 1, 5, 25, and 150 Mbps, the ICM-20608-G can be easily adapted to various settings.
  • The ICM-20608-G has a maximum pulse-width distortion of 1 ns, making it ideal for stable and consistent signal quality applications.
  • With a typical jitter content of 1 ns at 150 Mbps, the ICM-20608-G ensures consistent signal performance.
  • To guard against voltage spikes and surges, the ICM-20608-G has a transient immunity of 50 kV/s.
  • The ICM-20608-G may use 2.8-V (C-Grade), 3.3-V, or 5-V sources; therefore, it can be used in various setups.
  • The ICM-20608-G’s adaptability stems from its flexible signalling rate options, low channel-to-channel output skew, low pulse-width distortion, low jitter content, and good transient immunity.

Detailed Description

Both the ISO7220x and ISO7221x families of devices include not one but two distinct data channels: a high-frequency (HF) channel with a bandwidth that ranges from 100 kbps to 150 Mbps and a low-frequency (LF) channel that covers from 100 kbps all the way down to DC. Both of these channels are covered by families. Through the use of an input inverter gate, the single-ended input signal that is being received is changed into a differential signal. Then a capacitor-resistor network is used to distinguish the differential signal into transients. Comparators subsequently turn these transients into differential pulses, which are used to drive a NOR-gate flip-flop and an output multiplexer.

The amount of time that passes between signal transients is tracked by a decision logic (DCL), which instructs the output multiplexer to switch to the LF channel if the allotted time is exceeded. An internal oscillator modulates low-frequency input signals to generate a high-frequency signal that can pass the capacitive barrier. This signal is passed through a lowpass filter to extract the real data before being transmitted to an output multiplexer.

Application Information

The devices known as ISO7220x and ISO7221x implement a single-ended technology for TTL or CMOS logic switching. These devices’ power sources, VCC1 and VCC2, range from 2.8 volts (C-grade) to 5.5 volts. Because digital isolators are single-ended, it is crucial to remember this fact when designing with them. These devices are not compatible with any particular interface standard and are only meant for isolating single-ended digital signals of CMOS or TTL logic. This is because these devices are designed with a single-ended connection. Regardless of the interface type or standard, the digital isolator is normally positioned between the data controller (a microcontroller or UART) and the data converter or line transceiver. This placement is not dependent on the type of interface.

An isolated 4-20 mA current loop is one example of a typical application for the family of devices known as ISO7221x, which can be used in conjunction with Texas Instruments’ mixed signal microcontroller, digital-to-analogue converter, transformer driver, and voltage regulator to produce the desired result.

Power Supply Recommendations

A bypass capacitor with 0.1 microfarads of capacitance must be placed at the device’s input and output supply pins. This will help assure reliable performance regardless of the data rate or supply voltage (VCC1 and VCC2). It is recommended that the capacitors be installed in a location that is as close to the supply pins as is physically practical. If an application only has access to a single power source for the primary side, it is still possible to generate isolated power for the secondary side with the assistance of a transformer driver, such as the SN6501 device manufactured by Texas Instruments.


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