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NAT9914BPLF-27

製品説明
仕様・特性

IEEE 488.2 Controller Chip NAT9914 • • • • • • • • • Available as RoHS-compliant Pin compatible with TI TMS9914A Software compatible with NEC µPD7210 or TI TMS9914A controller chips Low power consumption Meets all IEEE 488.2 requirements – Bus line monitoring – Preferred implementation of requesting service – Will not send messages when there are no Listeners Performs all IEEE 488.1 interface functions Programmable data transfer rate (T1 delays of 350 ns, 500 ns, 1.1 µs, and 2 µs) Automatic EOS and/or NL message detection Direct memory access (DMA) • • • • • Automatically processes IEEE 488 commands and reads undened commands TTL-compatible CMOS device Programmable clock rate 20 MHz maximum Reduces driver overhead Does not lose a data byte if ATN is asserted while transmitting data Description General The NAT9914 IEEE 488.2 controller chip can perform all the interface functions dened by the IEEE Standard 488.1-1987, and also meets the additional requirements and recommendations of the IEEE Standard 488.2-1987. Connected between the processor and the IEEE 488 bus, the NAT9914 provides high-level management of the IEEE 488 bus, signicantly increases the throughput of driver software, and simplifies both the hardware and software design. The NAT9914 performs complete IEEE 488 Talker, Listener, and Controller functions. In addition to its numerous improvements, the NAT9914 is also completely pin compatible with the TI TMS 9914A and software compatible with the NEC µPD7210 and TI TMS9914A controller chips. The NAT9914 manages the IEEE 488 bus. You program the IEEE 488 bus by writing control words into the appropriate registers. CPU-readable status registers supply operational feedback. The NAT9914 mode determines the function of these registers. On power up or reset, the NAT9914 registers resemble those of the TMS9914A set, with additional registers that supply extra functionality and IEEE 488.2 compatibility. In this mode, the NAT9914 is completely pin compatible with the TI TMS9914A. If you enable the 7210 mode, the registers resemble those of the NEC µPD7210 set, with additional registers that supply extra functionality and IEEE 488.2 compatibility. This mode is not pin compatible with the NEC µPD7210. Figure 4 shows the key components of the NAT9914. IEEE 488.2 Overview The IEEE 488.2 standard removes the ambiguities of IEEE 488.1 by standardizing the way instruments and controllers operate. It defines data formats, status reporting, error handling, and common configuration commands to which all IEEE 488.2 instruments must respond in a precise manner. It also denes a set of controller requirements. With IEEE 488.2, you gain the benets of reduced development time and cost because systems are more compatible and reliable. The NAT9914 brings the full power of IEEE 488.2 to the design engineer along with numerous other design and performance benefits, while retaining the 40-pin and 44-pin hardware congurations of the TI TMS 9914A. RoHS Compliance The NAT9914 is currently available from NI both in a standard package and as a RoHS-compliant chip. The chips can be ordered using the part numbers shown in the Ordering Information box below. The RoHS-compliant parts are identified through the added “F” at the end of the part number and the chip itself is marked with an e3 inside an ellipse to indicate a matte pure tin finish on the leads, in accordance with the marking recommendations defined in JEDEC JESD97. The RoHS-compliant NAT9914 meets industry requirements for baking and maximum solder reflow temperature. The baking requirements are outlined in JEDEC J-STD-033, and

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NAT1-18-56CB NAT-12 NAT12039 NAT12-100J-TU NAT12-101J-TP
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NAT12-220J-TU NAT12-241J-TU NAT12-272J-TU NAT12-2R2J-TU NAT12-333J-TU
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NAT14362JTU NAT14-363JTB26 NAT14-390JTB26 NAT14-391JTB26 NAT14-393JTB26
NAT14-3R3JTB26 NAT14-3R9JTB26 NAT14-430JTB26 NAT14-431JTB26 NAT14-432JTB26
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NAT14501626-001 NAT14-510JTB26 NAT14-511JTB26 NAT14-512JTB26 NAT14-513JTB26
NAT14-563JTB26TP NAT14563JTU NAT14-5R6JTB26 NAT14-620JTB26 NAT14621GTU
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NAT14JT470 NAT15-18-56CB NAT-2 NAT2000N10R26 NAT-20DC
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NATC00T11N35PB NATC00T11N35PN NATC00T11N35SA NATC00T11N35SN NATC00T13N35PA
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NATHONG NATIONA NATIONL NATL#LM317AT NATLBKJHAF-10000000MHZ
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