Features
- Qualified to Renesas Rad Tolerant Screening and QCI Flow (R34TB0004EU)
- PVIN supply range: 3V to 18V
- Independent clock output supply: 3V to 5.5V
- Programmable output frequency starting at 25kHz
- Internal or external clock source
- Programmable phase delay as low as 15° increments
- I²C/SMBus compatible
- I²C/SMBus or pin strapping to set frequency and phase
- TID radiation lot acceptance testing (LDR ≤ 10mrad(Si)/s)
- ISL74420M30NZ: 30krad(Si)
- ISL74420M50NZ: 50krad(Si)
- SEE characterization
- No DSEE for PVIN = 20.7V, VCC = 5.5V, and VCCEXT = 6.5V at 46MeV·cm²/mg
- SEFI <10μm² at 46MeV·cm²/mg
- No missing pulse SETs and frequency deviation SETs <3.6% on CLKOUTx at 46MeV·cm²/mg
Description
The ISL74420M is a radiation tolerant, quad-output clock fanout IC with an optional internal oscillator. It provides synchronization clocks for any application and is particularly useful in multiphase power converters.
Using this device, users can connect multiple ISL74420M devices to create more than four synchronized clocks, set division and delay options through selection pins or over an I2C/SMBus interface, configure each of the four outputs to a specific frequency division and phase delay, and tune the 48MHz internal oscillator by ± 10% with an external resistor
The ISL74420M is available in a 48-lead TQFP-EP package and operates in the −55°C to +125°C temperature range.
Parameters
| Attributes | Value |
|---|---|
| Rating | Space |
| Cascadable? | Yes |
| Interface | I2C |
| Minimum Clock Frequency | 25kHz |
| Maximum Clock Frequency | 48MHz |
| Outputs (#) | 4 |
| Output Clock Supply Voltage (min) (V) | 3 |
| Output Clock Supply Voltage (max) (V) | 5.5 |
| Supply current (mA) | 33 |
| Supply Voltage (min) (V) | 3 - 3 |
| Supply Voltage (max) (V) | 18 - 18 |
| Temp. Range (°C) | -55 to +125°C |
| TID LDR (krad(Si)) | 30, 50 |
| DSEE (MeV·cm2/mg) | 46 |
| Flow | RT Plastic |
| Qualification Level | Radiation Tolerant Plastic |
| Die Sale Availability? | No |
| PROTO Availability? | No |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TQFP-EP | 7.0 x 7.0 x 1.00 | 48 | 0.5 |
Applications
- Multiphase power converters
- Synchronizing multiple converters on one board to control EMI and crosstalk
Renesas Boards & Kits
Radiation Tolerant Quad Clock Output Evaluation Board
The ISL74420MEV1Z radiation-tolerant quad clock fanout IC evaluation board features the plastic version of the ISL74420M. Mechanical switches simplify configuration, enabling easier experimentation with frequency and delay selections.
This board is functionally similar to the ISL74420MDEMO1Z, a... Read More
Radiation Tolerant Quad Clock Output Demonstration Board
The ISL74420MDEMO1Z radiation tolerant quad clock fanout IC demonstration board features the plastic version of the ISL74420M. The ISL74420MDEMO1Z is an example of a small-footprint layout with SMD resistors for user-defined power-up configuration.
This board is functionally similar to the... Read More
