ISO721 - 单路 100Mbps 数字隔离器

ISO721是TI德州仪器公司的一款无产品，ISO721是单路 100Mbps 数字隔离器，本站介绍了ISO721的封装应用图解、特点和优点、功能等，并给出了与ISO721相关的TI元器件型号供参考。

ISO721 - 单路 100Mbps 数字隔离器 - 无 - 数字隔离器 - 德州仪器

产品特性

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

产品应用

Industrial Fieldbus
- Modbus
- Profibus
- DeviceNet™ Data Buses
- Smart Distributed Systems (SDS™)
Computer Peripheral Interface
Servo Control Interface
Data Acquisition

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
ISO721	SOP (8)	9.50mm x 6.57mm
ISO721	SOIC (8)	4.90mm x 3.91mm
ISO721M
ISO722
ISO722M

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