Texas Instruments ISO654x/ISO654x-Q1 Quad Functional Isolators
Texas Instruments ISO654x/ISO654x-Q1 Quad-Channel Functional Isolators are for cost-sensitive, space-constrained applications that require isolation for non-safety applications. The isolation barrier supports transient overvoltages of 707VRMS/1000VDC and a working voltage of 400VRMS/566VDC. The ISO654x devices provide high EMC performance while isolating CMOS or LVCMOS digital I/Os. ISO654x uses SiO2 as the isolation barrier. Each isolation channel has a logic output and input buffer separated by the insulation barrier. These devices come with enable pins that can be used to put the respective outputs in high impedance.
The Texas Instruments ISO6540 and ISO6540F devices have all channels in the forward direction. The ISO6541 and ISO6541F devices have one reverse-direction channel, and the ISO6542 and ISO6542F devices have two reverse-direction channels. In the event of signal or input power loss, the default output is high for devices without the suffix F and low for devices with the suffix F. See Section 7.4 for further details.
These devices help prevent noise currents on GPIOs or data buses such as SPI, UART, RS-485, RS-232, and CAN from causing data corruption or damaging sensitive circuitry. The devices' electromagnetic compatibility has been significantly enhanced through chip design and layout techniques to ease system-level design.
Features
- Up to 50Mbps data rate
- Robust SiO2 isolation barrier
- Functional isolation (DBQ-16)
- 400VRMS, 566VDC working voltage
- 707VRMS, 1000VDC transient voltage (60s)
- Wide temperature range of -40°C to 125°C
- ±150kV/μs typical CMTI
- Supply range of 1.71V to 5.5V
- Default output high (ISO654x) and low (ISO654xF) options
- 1.5mA per channel typical at 1Mbps and 3.3V (ISO6540)
- Low propagation delay of 11ns typical at 3.3V
- Robust electromagnetic compatibility (EMC)
- System-level ESD, EFT, and surge immunity
- Low emissions
- SSOP (DBQ-16) package
Applications
- Power supplies
- Grid, electricity meter
- Motor drives
- Factory automation
- Building automation
- Lighting
- Appliances
Simplified Schematic
Publicerad: 2025-06-09
| Uppdaterad: 2025-06-17