The ISO7221CDR family of devices are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in ISO7220x and opposite in ISO7221x. These devices feature logic input and output buffers separated by TI's silicon dioxide (SiO2) insulating gate, providing 4000 VPK. When used with isolated power supplies, these devices block high voltages and isolated grounds, and prevent noise currents on the data bus or other circuits from entering the local ground or causing interference or damage to sensitive circuits.

The ISO7221CDR conditions and converts a binary input signal to a balanced signal, which is then differentiated by a capacitive isolation barrier. Across this isolation barrier, differential comparators can receive logic transition information and then set or reset flip-flops and output circuits accordingly. The circuit will send periodic update pulses across the isolation barrier to ensure that the DC level output is normal. If this DC update pulse is not received every 4µs, the input is assumed to be unpowered, or not actively driven, and the fail-safe circuit will drive the output to a logic high state.

The ISO7221CDR's low capacitance capacitors and resulting time constant provide high-speed operation with signaling rates ranging from 0Mbps (DC) to 150Mbps (signal rate on the line is the number of voltage transitions per second, expressed in bps). A-Option, B-Option, and C-Option devices have TTL input thresholds and a noise filter on the input to prevent transient pulses from being passed to the device's output. M-option devices feature CMOS VCC/2 input thresholds, no input noise filter, and additional propagation delay.

The ISO7221CDR family of devices requires two 2.8V (C grade), 3.3V, 5V supplies, or any combination of these supplies. All inputs are 5V tolerant and all outputs are 4mA CMOS when powered from a 2.8V or 3.3V supply.

The ISO7221CDR family of devices operates over an ambient temperature range of –40°C to +125°C.

Product Specifications:

Product Category: Digital Isolators

RoHS: Details

Series: ISO7221C

Installation style: SMD/SMT

Package/Case: SOIC-8

Number of channels: 2 Channel

Polarity: Unidirectional

Data rate: 25 Mb/s

Insulation Voltage: 2500 Vrms

Isolation Type: Capacitive Coupling

Supply Voltage - Maximum: 5 V

Supply Voltage - Min: 2.8 V

Operating supply current: 12 mA

Propagation Delay Time: 42 ns

Minimum operating temperature: - 40 C

Maximum operating temperature: + 125 C

Package: Reel

Package: Cut Tape

Package: MouseReel

Trademark: Texas Instruments

Forward Channel: 1 Channel

Operating Supply Voltage: 3 V to 5.5 V

Product Type: Digital Isolators

Back channel: 1 Channel

Subcategory: Interface ICs

Type: General Purpose

Unit weight: 540 mg