TMP47C670N

      The TMP47C670N has the following features including 4-bit single chip microcomputer;instruction exection time;interval timer;two 12bit timer/counters.
      There are six commands called op-codes that can be issued by the bus master to the TMP47C670N-V747. They are listed in the table below. These op-codes control the functions performed by the memory. TMP47C670N can be divided into three categories. First, there are commands that have no subsequent operations. They perform a single function such as to enable a write operation. Second are commands followed by one byte, either in or out. They operate on the status register. The third group includes commands for memory transactions followed by address and one or more bytes of data. The on-chip UART is compatible with the 16C550A. There is a dedicated Serial Infrared interface UART, which complies with IrDA v1.2 (Fast IR), HPSIR, and ASKIR formats (used by Sharp and other PDAs), as well as Consumer IR. There is a second dedicated Consumer Infrared interface, which complies with NEC PPM and Phillips RC5 formats.
      There are two limitations on the power handling ability of a TMP47C670N transistor: average junction temperature and second breakdown. Safe operating area curves indicate IC-VCE limits of the transistor that must be observed for reliable operation; i.e., the transistor must not be subjected to greater dissipation than the curves indicate.   The data of Figure 2 is based on TJ(pk) = 150C; TC is variable depending on conditions. Second breakdown pulse limits are valid for duty cycles to 10% provided TJ(pk) v 150C. TJ(pk) may be calculated from the data in Figure 1. At high case temperatures, thermal limitations will reduce the power that can be handled to values less than the limitations imposed by second breakdown.  Important Notice: Texas Instruments (TI) reserves the right to make changes to or discontinue any product or service identified in this publication without notice. TI advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the TMP47C670N information being relied upon is current. TI assumes no responsibility for infringements of patents or rights of others based on TI applications assistance or product specifications since TI does not possess full access concerning the use or application of customers' products. TI also assumes no responsibility for customers' product designs.