Description
ISO7220BDR TI IC General Purpose Digital Isolator 2500Vrms 2 Channel 5Mbps 25kV/µs CMTI 8-SOIC (0.154″, 3.90mm Width) ISO RoHS
The ISO7220x and ISO7221x devices are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220x and in opposite directions in the ISO7221x. These devices have a logic input and output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to 4000 VPK per VDE. Used in conjunction with isolated power supplies, these devices block high voltage and isolate grounds, as well as prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.
A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or resets a flip-flop and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received every 4 µs, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state.
The small capacitance and resulting time constant provide fast operation with signaling rates available from 0 Mbps (DC) to 150 Mbps (The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps). The A-option, B-option, and 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 and the additional propagation delay.
The ISO7220x and ISO7221x devices require two supply voltages of 2.8 V (C-Grade), 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 2.8-V or 3.3-V supply and all outputs are 4-mA CMOS.
The ISO7220x and ISO7221x devices are characterized for operation over the ambient temperature range of –40°C to 125°C.
Specifications
Manufacturer: Texas Instruments
Product Category: Digital Isolators
RoHS: RoHS Compliant
Number of Channels: 2 Channel
Polarity: Unidirectional
Isolation Voltage: 2500 Vrms
Isolation Type: Capacitive Coupling
Data Rate: 5 Mb/s
Propagation Delay Time: 78 ns
Supply Voltage – Max: 5.5 V
Supply Voltage – Min: 3 V
Operating Supply Current: 17 mA
Maximum Operating Temperature: + 125 C
Minimum Operating Temperature: – 40 C
Mounting Style: SMD/SMT
Package / Case: SOIC-8
Packaging: Reel
Brand: Texas Instruments
Forward Channels: 2 Channel
Maximum Rise Time: 2 ns (Typ)
Operating Supply Voltage: 3.3 V, 5 V
Product: Digital Isolators
Reverse Channels: 0 Channel
Series: ISO7220B
Shutdown: No Shutdown
Factory Pack Quantity: 2500
Type: General Purpose Digital Isolator
Unit Weight: 0.019048 oz
Manufacturer Part Number: ISO7220BDR
Manufacturer: Texas Instruments
