ISO7221C-HT
- 1-, 5- and 25-Mbps Signaling Rate Options
- Low Channel-to-Channel Output Skew; 1 ns max
- Low Pulse-Width Distortion (PWD); 1 ns max
- Low Jitter Content; 1 ns Typ at 150 Mbps
- 4000-Vpeak Isolation, 560 Vpeak VIORM
- UL 1577 Approved
- 50-kV/µs Typical Transient Immunity
- Operates with 3.3-V or 5-V Supplies
- 4-kV ESD Protection
- High Electromagnetic Immunity
The ISO7221 is a dual-channel digital isolator. To facilitate PCB layout, the channels are oriented in the opposite directions. This device has a logic input and output buffer separated by TIs silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, this device blocks high voltage, isolates grounds, and prevents 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(3). The A-, B- 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.
This device requires two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply and all outputs are 4-mA CMOS.
The ISO7221 is characterized for operation over the ambient temperature range of 55°C to 175°C.
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技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | Dual Digital Isolator . datasheet (Rev. A) | 2012年 10月 1日 | |
* | Radiation & reliability report | ISO7221HD Reliability Report (Rev. A) | 2012年 8月 17日 | |
White paper | Improve Your System Performance by Replacing Optocouplers with Digital Isolators (Rev. C) | PDF | HTML | 2023年 9月 7日 | |
Certificate | UL Certificate of Compliance File E181974 Vol 4 Sec 1 (Rev. A) | 2022年 8月 5日 | ||
White paper | Why are Digital Isolators Certified to Meet Electrical Equipment Standards? | 2021年 11月 16日 | ||
White paper | Distance Through Insulation: How Digital Isolators Meet Certification Requiremen | PDF | HTML | 2021年 6月 11日 | |
EVM User's guide | Universal Digital Isolator Evaluation Module | PDF | HTML | 2021年 3月 4日 | |
Application brief | Considerations for Selecting Digital Isolators | 2018年 7月 24日 |
設計與開發
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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。
封裝 | 引腳 | 下載 |
---|---|---|
SOIC (D) | 8 | 檢視選項 |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點
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。