Datasheet > SN74V235

SN74V235

更新时间： 2024-11-20 22:50:59

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
40页	553K
描述
512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES

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SN74V235 数据手册

SN74V215, SN74V225, SN74V235, SN74V245

512 × 18, 1024 × 18, 2048 × 18, 4096 × 18

DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES

SCAS636E – APRIL 2000 – REVISED SEPTEMBER 2002

512 × 18-Bit Organization Array (SN74V215)

Asynchronous or Coincident Read and

Write Clocks

1024 × 18-Bit Organization Array

(SN74V225)

Asynchronous or Synchronous

Programmable Almost-Empty and

Almost-Full Flags With Default Settings

2048 × 18-Bit Organization Array

(SN74V235)

Half-Full Flag Capability

4096 × 18-Bit Organization Array

(SN74V245)

Output Enable Puts Output Data Bus in

High-Impedance State

7.5-ns Read/Write Cycle Time

High-Performance Submicron CMOS

Technology

3.3-V V , 5-V Input Tolerant

First-Word or Standard Fall-Through

Timing

Packaged in 64-Pin Thin Quad Flat Package

DSP and Microprocessor Interface Control

Logic

Single or Double Register-Buffered Empty

and Full Flags

Provide a DSP Glueless Interface to Texas

Instruments TMS320 DSPs

Easily Expandable in Depth and Width

description

TheSN74V215, SN74V225, SN74V235, andSN74V245areveryhigh-speed, low-powerCMOSclockedfirst-in

first-out (FIFO) memories. They support clock frequencies up to 133 MHz and have read-access times as fast

as 5 ns. These DSP-Sync FIFO memories feature read and write controls for use in applications such as

DSP-to-processor communication, DSP-to-analog front end (AFE) buffering, network, video, and data

communications.

These are synchronous FIFOs, which means each port employs a synchronous interface. All data transfers

through a port are gated to the low-to-high transition of a continuous (free-running) port clock by enable signals.

The continuous clocks for each port are independent of one another and can be asynchronous or coincident.

The enables for each port are arranged to provide a simple interface between DSPs, microprocessors, and/or

buses controlled by a synchronous interface. An output-enable (OE) input controls the 3-state output.

The synchronous FIFOs have two fixed flags, empty flag/output ready (EF/OR) and full flag/input ready (FF/IR),

and two programmable flags, almost-empty (PAE) and almost-full (PAF). The offset loading of the

programmable flags is controlled by a simple state machine, and is initiated by asserting the load pin (LD). A

half-full flag (HF) is available when the FIFO is used in a single-device configuration.

Two timing modes of operation are possible with these devices: first-word fall-through (FWFT) mode and

standard mode.

In FWFT mode, the first word written to an empty FIFO is clocked directly to the data output lines after three

transitions of the RCLK signal. A read enable (REN) does not have to be asserted for accessing the first word.

In standard mode, the first word written to an empty FIFO does not appear on the data output lines unless a

specific read operation is performed. A read operation, which consists of activating REN and enabling a rising

RCLK edge, shifts the word from internal memory to the data output lines.

These devices are depth expandable, using a daisy-chain technique or FWFT mode. The XI and XO pins are

used to expand the FIFOs. In depth-expansion configuration, first load (FL) is grounded on the first device and

set to high for all other devices in the daisy chain.

The SN74V215, SN74V225, SN74V235, and SN74V245 are characterized for operation from 0°C to 70°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

DSP-SYNC and TMS320 are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...40

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SN74V235 替代型号

型号	品牌	替代类型	描述	数据表
SN74V245	TI	功能相似	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V225	TI	功能相似	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V215	TI	功能相似	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES

与SN74V235相关器件

型号	品牌	获取价格	描述	数据表
SN74V235-10PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V235-15PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V235-20PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V235-7PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V245	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V245-10PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V245-15PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V245-15PAGEP	TI	获取价格	暂无描述
SN74V245-20PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
SN74V245-7PAG	TI	获取价格	512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES

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