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UPD784224 Datasheet(PDF) 7 Page - NEC |
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UPD784224 Datasheet(HTML) 7 Page - NEC |
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7 / 92 page  7 µPD784224, 784225, 784224Y, 784225Y Data Sheet U12376EJ1V0DS00 1. DIFFERENCES AMONG MODELS IN µPD784225, 784225Y SUBSERIES The only difference among the µPD784224 and 784225 lies in the internal memory capacity. The µPD784224Y and 784225Y are based on the µPD784224 and 784225 respectively, with the addition of an I2C bus control function. The µPD78F4225 and 78F4225Y are provided with a 128-Kbyte flash memory instead of the mask ROM of the above models. These differences are summarized in Table 1-1. Table 1-1. Differences among Models in µPD784225, 784225Y Subseries Part Number µPD784224, µPD784225, µPD78F4225, Item µPD784224Y µPD784225Y µPD78F4225Y Internal ROM 96 Kbytes 128 Kbytes 128 Kbytes (mask ROM) (mask ROM) (Flash memory) Internal RAM 3,584 bytes 4,352 bytes Internal memory None Provided size switching register (IMS)Note Supply voltage VDD = 1.8 to 5.5 V VDD = 1.9 to 5.5 V Electrical Refer to the data sheet for each device. specifications Recommended soldering conditions TEST pin Provided None VPP pin None Provided Note The internal flash memory capacity and internal RAM capacity can be changed using the internal memory size switching register (IMS). Caution There are differences in noise immunity and noise radiation between the flash memory and mask ROM versions. When pre-producing an application set with the flash memory version and then mass-producing it with the mask ROM version, be sure to conduct sufficient evaluations on the commercial samples (not engineering samples) of the mask ROM version. |
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