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74AHC259 数据表(PDF) 1 Page - NXP Semiconductors |
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74AHC259 数据表(HTML) 1 Page - NXP Semiconductors |
1 / 17 page 1. General description The 74AHC259; 74AHCT259 is a high-speed Si-gate CMOS device and is pin compatible with Low-power Schottky TTL (LSTTL). It is specified in compliance with JEDEC standard No. 7-A. The 74AHC259; 74AHCT259 is a high-speed 8-bit addressable latch designed for general purpose storage applications in digital systems. It is a multifunctional device capable of storing single-line data in eight addressable latches and providing a 3-to-8 decoder and multiplexer function with active HIGH outputs (Q0 to Q7). It also incorporates an active LOW common reset (MR) for resetting all latches as well as an active LOW enable input (LE). The 74AHC259; 74AHCT259 has four modes of operation: • In the addressable latch mode, data on the data line (D) is written into the addressed latch. The addressed latch will follow the data input with all non-addressed latches remaining in their previous states. • In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. • In the 3-to-8 decoding or demultiplexing mode, the addressed output follows the state of the data input (D) with all other outputs in the LOW state. • In the reset mode, all outputs are LOW and unaffected by the address inputs (A0 to A2) and data input (D). When operating the 74AHC259; 74AHCT259 as an address latch, changing more than one bit of the address could impose a transient-wrong address. Therefore, this should only be done while in the memory mode. 2. Features I Balanced propagation delays I All inputs have Schmitt-trigger actions I Combines demultiplexer and 8-bit latch I Serial-to-parallel capability I Output from each storage bit available I Random (addressable) data entry I Easily expandable I Common reset input I Useful as a 3-to-8 active HIGH decoder I Inputs accept voltages higher than VCC 74AHC259; 74AHCT259 8-bit addressable latch Rev. 02 — 15 May 2008 Product data sheet |
类似零件编号 - 74AHC259_08 |
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类似说明 - 74AHC259_08 |
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