ISO721M
- 100 and 150Mbps signaling rate options
- Propagation delay is 12ns typical.
- Pulse skew is 0.5ns typical.
- Low-power sleep mode
-
Typical 28year life at rated working voltage (see Isolation Lifetime Projection)
- High electromagnetic immunity (see application note ISO72x Digital Isolator Magnetic-Field Immunity)
- Failsafe output
- Drop-in replacement for most opto and magnetic isolators
- Operates from 3.3V and 5V supplies
- –40°C to +125°C operating temperature range
- Safety-related certifications:
- DIN EN IEC 60747-17 (VDE 0884-17)
- UL 1577 component recognition program
- IEC 61010-1, IEC 62368-1 certifications
The ISO721, ISO721M, ISO722, and ISO722M devices are digital isolators with a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. This barrier provides galvanic isolation of up to 4000VPK per VDE 0884-17. Used in conjunction with isolated power supplies, these devices 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 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 provide the proper dc level of the output.
If this dc-refresh pulse is not received for more than 4µs, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic-high state.
These devices require two supply voltages of 3.3V, 5V, or any combination. All inputs are 5V tolerant when supplied from a 3.3V supply and all outputs are 4mA CMOS.
The ISO722 and ISO722M devices include an active-low output enable that when driven to a high logic level, places the output in a high-impedance state and turns off internal bias circuitry to conserve power.
The ISO721 and ISO722 devices have TTL input thresholds and a noise filter at the input that prevent transient pulses of up to 2ns in duration from being passed to the output of the device.
The ISO721M and ISO722M devices have CMOS VCC / 2 input thresholds, but do not have the noise-filter and the additional propagation delay. These features of the ISO721M device also provide for reduced-jitter operation.
The ISO721, ISO721M, ISO722, and ISO722M devices are characterized for operation over the ambient temperature range of –40°C to +125°C.
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DIGI-ISO-EVM — 通用數位隔離器評估模組
DIGI-ISO-EVM 是一款評估模組 (EVM),可評估任何 TI 單通道、雙通道、三通道、四通道或六通道數位隔離器裝置,並提供五種不同封裝 - 8 接腳窄體 SOIC (D)、8 接腳寬體 SOIC (DWV)、16 接腳寬體 SOIC (DWW)、16 接腳超寬體 SOIC (DWW) 和 16 接腳 (DBQ) 封裝。EVM 具備足夠 Berg 接腳選項,可用於評估具最少外部零組件的裝置。
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訂購與品質
- RoHS
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- MTBF/FIT 估算值
- 材料內容
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建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。