SN74ALS232B
- Independent Asynchronous Inputs and Outputs
- 16 Words by 4 Bits
- Data Rates up to 40 MHz
- Fall-Through Time 14 ns Typical
- 3-State Outputs
- Package Options Include Plastic Small-Outline Package (DW), Plastic Chip Carriers (FN), and Standard Plastic 300-mil DIPs (N)
This 64-bit memory features high speed and fast fall-through times. It is organized as 16 words by 4 bits.
A first-in, first-out (FIFO) memory is a storage device that allows data to be written into and read from its array at independent data rates. This FIFO is designed to process data at rates up to 40MHz in a bit-parallel format, word by word.
Data is written into memory on a low-to-high transition at the load-clock (LDCK) input and is read out on a low-to-high transition at the unload-clock (UNCK) input. The memory is full when the number of words clocked in exceeds by 16 the number of words clocked out. When the memory is full, LDCK signals have no effect on the data residing in memory. When the memory is empty, UNCK signals have no effect.
Status of the FIFO memory is monitored by the FULL\ and EMPTY\ output flags. The FULL\ output is low when the memory is full and high when it is not full. The EMPTY\ output is low when the memory is empty and high when it is not empty.
A low level on the reset (RST\) input resets the internal stack-control pointers and also sets EMPTY\ low and sets FULL\ high. The Q outputs are not reset to any specific logic level. The first low-to-high transition on LDCK, after either a RST\ pulse or from an empty condition, causes EMPTY\ to go high and the data to appear on the Q outputs. It is important to note that the first word does not have to be unloaded. Data outputs are noninverting with respect to the data inputs and are at high impedance when the output-enable (OE) input is low. OE does not affect the FULL\ or EMPTY\ output flags. Cascading is easily accomplished in the word-width direction but is not possible in the word-depth direction.
The SN74ALS232B is characterized for operation from 0°C to 70°C.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | 16 X 4 Asynchronous First-In First-Out Memory 数据表 (Rev. B) | 1998年 4月 1日 | |||
选择指南 | Logic Guide (Rev. AB) | 2017年 6月 12日 | ||||
应用手册 | Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) | 2015年 12月 2日 | ||||
选择指南 | 逻辑器件指南 2014 (Rev. AA) | 最新英语版本 (Rev.AB) | 2014年 11月 17日 | |||
用户指南 | LOGIC Pocket Data Book (Rev. B) | 2007年 1月 16日 | ||||
应用手册 | Semiconductor Packing Material Electrostatic Discharge (ESD) Protection | 2004年 7月 8日 | ||||
应用手册 | TI IBIS File Creation, Validation, and Distribution Processes | 2002年 8月 29日 | ||||
应用手册 | Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (Rev. A) | 1997年 8月 1日 | ||||
应用手册 | 使用逻辑器件进行设计 (Rev. C) | 1997年 6月 1日 | ||||
应用手册 | Input and Output Characteristics of Digital Integrated Circuits | 1996年 10月 1日 | ||||
应用手册 | Live Insertion | 1996年 10月 1日 | ||||
应用手册 | Advanced Schottky (ALS and AS) Logic Families | 1995年 8月 1日 |
设计和开发
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