ISO722
- 100 and 150-Mbps Signaling Rate Options
- Low Propagation Delay
- Low Pulse Skew
- Low-Power Sleep Mode
- High Electromagnetic Immunity
- Low Input-Current Requirement
- Failsafe Output
- Drop-In Replacement for Most Opto and Magnetic
Isolators - Operates from 3.3 V and 5 V Supplies
- –40°C to 125°C Operating Temperature Range
- 50 kV/µs Transient Immunity, Typical
- Safety and Regulatory Approvals
- VDE Basic Insulation with 4000-VPK VIOTM,
560 VPK VIORM - 2500 VRMS Isolation per UL 1577
- CSA Approved for Component Acceptance
Notice 5A and IEC 60950-1
- VDE Basic Insulation with 4000-VPK VIOTM,
- APPLICATIONS
- Industrial Fieldbus
- Modbus
- Profibus
- DeviceNet™ Data Buses
- Smart Distributed Systems (SDS™)
- Computer Peripheral Interface
- Servo Control Interface
- Data Acquisition
- Industrial Fieldbus
All other trademarks are the property of their respective owners
The ISO721, ISO721M, ISO722, and ISO722M 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 4000 VPK per VDE. 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 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 for more than 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 symmetry of the dielectric and capacitor within the integrated circuitry provides for close capacitive matching, and allows fast transient voltage changes between the input and output grounds without corrupting the output. The small capacitance and resulting time constant provide for fast operation with signaling rates from 0 Mbps (DC) to 100 Mbps for the ISO721 and the ISO722 devices, and 0 Mbps to 150 Mbps with the ISO721M and the ISO722M devices.
These devices require 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 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.
Both the ISO721 and ISO722 devices have TTL input thresholds and a noise filter at the input that prevent transient pulses of up to 2 ns 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.
기술 문서
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
DIGI-ISO-EVM — 범용 디지털 아이솔레이터 평가 모듈
DIGI-ISO-EVM은 5가지 패키지(8핀 네로우 바디 SOIC(D), 8핀 와이드 바디 SOIC(DWV), 16핀 와이드 바디 SOIC(DW), 16핀 울트라 와이드 바디 SOIC(DWW), 16핀 QSOP(DBQ) 패키지)에서 TI 싱글 채널, 듀얼 채널, 트리플 채널, 쿼드 채널 또는 6채널 디지털 절연기 장치를 평가하는 데 사용되는 평가 모듈(EVM)입니다. EVM에는 최소한의 외부 구성품으로 장치를 평가할 수 있는 충분한 Berg 핀 옵션이 있습니다.
| 패키지 | 핀 | 다운로드 |
|---|---|---|
| SOIC (D) | 8 | 옵션 보기 |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치
권장 제품에는 본 TI 제품과 관련된 매개 변수, 평가 모듈 또는 레퍼런스 디자인이 있을 수 있습니다.