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MCF5275CVM166 bảng dữ liệu(PDF) 10 Page - Freescale Semiconductor, Inc |
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MCF5275CVM166 bảng dữ liệu(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 44 page MCF5275 Integrated Microprocessor Family Hardware Specification, Rev. 4 Design Recommendations Freescale Semiconductor 10 5.2.1 Supply Voltage Sequencing and Separation Cautions Figure 2 shows situations in sequencing the I/O VDD (OVDD), SDRAM VDD (SDVDD), PLL VDD (PLLVDD), and Core VDD (VDD). Figure 2. Supply Voltage Sequencing and Separation Cautions The relationship between SDVDD and OVDD is non-critical during power-up and power-down sequences. SDVDD (2.5V or 3.3V) and OVDD are specified relative to VDD. 5.2.1.1 Power Up Sequence If OVDD/SDVDD are powered up with VDD at 0 V, then the sense circuits in the I/O pads cause all pad output drivers connected to the OVDD/SDVDD to be in a high impedance state. There is no limit on how long after OVDD/SDVDD powers up before VDD must powered up. VDD should not lead the OVDD, SDVDD, or PLLVDD by more than 0.4 V during power ramp-up or high current will be in the internal ESD protection diodes. The rise times on the power supplies should be slower than 1 μs to avoid turning on the internal ESD protection clamp diodes. The recommended power up sequence is as follows: 1. Use 1 μs or slower rise time for all supplies. 2. VDD/PLLVDD and OVDD/SDVDD should track up to 0.9 V, then separate for the completion of ramps with OVDD/SD VDD going to the higher external voltages. One way to accomplish this is to use a low drop-out voltage regulator. SDVDD (2.5V) Supplies Stable 2 1 3.3V 2.5V 1.5V 0 Time Notes: VDD should not exceed OVDD, SDVDD or PLLVDD by more than 0.4 V at any time, including power-up. Recommended that VDD should track OVDD/SDVDD/PLLVDD up to 0.9 V, then separate for completion of ramps. Input voltage must not be greater than the supply voltage (OVDD, SDVDD, VDD, or PLLVDD) by more than 0.5 V at any time, including during power-up. Use 1 ms or slower rise time for all supplies. 1. 2. 3. 4. VDD, OVDD, SDVDD, PLLVDD |
Số phần tương tự - MCF5275CVM166 |
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Mô tả tương tự - MCF5275CVM166 |
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