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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC667201MMG3 датащи(PDF) 66 Page - Freescale Semiconductor, Inc |
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SC667201MMG3 датащи(HTML) 66 Page - Freescale Semiconductor, Inc |
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66 / 120 page  MPC5642A Microcontroller Data Sheet, Rev. 3.1 66 Freescale Semiconductor Electrical characteristics 3.6.2 Recommended power transistors The following NPN transistors are recommended for use with the on-chip voltage regulator controller: ON Semiconductor™ BCP68T1 or NJD2873 as well as Philips Semiconductor™ BCP68. The collector of the external transistor is preferably connected to the same voltage supply source as the output stage of the regulator. 3.7 Power up/down sequencing There is no power sequencing required among power sources during power up and power down, in order to operate within specification. Although there are no power up/down sequencing requirements to prevent issues such as latch-up or excessive current spikes, the state of the I/O pins during power up/down varies according to Table 18 for all pins with pad type fast, and Table 19 for all pins with pad type medium, slow, and multi-voltage. Re 0.252 0.280 0.308 +/-10% Creg — 10 F — It depends on external Vreg. Cc 5 F10F13.5F X7R, -50%/+35% Rc 1.1 — 5.6 May or may not be required. It depends on the allowable power dissipation of T1. Table 17. Transistor recommended operating characteristics Symbol Parameter Value Unit hFE () DC current gain (Beta) 60–550 — PD Absolute minimum power dissipation >1.0 (1.5 preferred) W ICMaxDC Minimum peak collector current 1.0 A VCESAT Collector-to-emitter saturation voltage 200–6001 1 Adjust resistor at bipolar transistor collector for 3.3 V/5.0 V to avoid VCE < VCE SAT mV VBE Base-to-emitter voltage 0.4–1.0 V Table 18. Power sequence pin states—Fast type pads VDDE VRC33 VDD Pin state Low X X Low VDDE Low X High VDDE VRC33 Low High impedance VDDE VRC33 VDD Functional Table 16. MPC5642A External network specification (continued) External Network Parameter Min Typ Max Comment |
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