Datasheet > SN74ALS235N

SN74ALS235N

更新时间： 2024-11-29 20:54:47

品牌	Logo	应用领域
德州仪器 - TI		时钟先进先出芯片光电二极管内存集成电路
页数	文件大小	规格书
15页	242K
描述
64 x 5 Asynchronous FIFO memory 20-PDIP 0 to 70

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SN74ALS235N 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP, DIP20,.3	针数：	20
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.32.00.71	风险等级：	5.66
最长访问时间：	22 ns	最大时钟频率 (fCLK)：	25 MHz
周期时间：	40 ns	JESD-30 代码：	R-PDIP-T20
长度：	24.325 mm	内存密度：	320 bit
内存集成电路类型：	OTHER FIFO	内存宽度：	5
功能数量：	1	端子数量：	20
字数：	64 words	字数代码：	64
工作模式：	ASYNCHRONOUS	最高工作温度：	70 °C
最低工作温度：		组织：	64X5
输出特性：	3-STATE	可输出：	YES
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP20,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	并行/串行：	PARALLEL
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
座面最大高度：	5.08 mm	子类别：	FIFOs
最大压摆率：	0.17 mA	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	4.5 V	标称供电电压 (Vsup)：	5 V
表面贴装：	NO	技术：	TTL
温度等级：	COMMERCIAL	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.62 mm
Base Number Matches：	1

SN74ALS235N 数据手册

SN74ALS235

64 × 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY

SDAS108A – OCTOBER 1986 – REVISED SEPTEMBER 1993

DW OR N PACKAGE

(TOP VIEW)

Asynchronous Operation

Organized as 64 Words by 5 Bits

Data Rates From 0 to 25 MHz

3-State Outputs

AF/AE

Package Options Include Plastic

Small-Outline Packages (DW), Plastic

J-Leaded Chip Carriers (FN), and Standard

Plastic 300-mil DIPs (N)

13 Q3

12 Q4

11 RST

description

The SN74ALS235 is a 320-bit memory utilizing

advanced low-power Schottky IMPACT

technology. It features high speed with fast

fall-through times and is organized as 64 words by

5 bits.

GND 10

FN PACKAGE

(TOP VIEW)

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. The

SN74ALS235 is designed to process data at rates

from 0 to 25 MHz in a bit-parallel format, word by

word.

20 19

Data is written into memory on the rising edge of

the shift-in (SI) input. When SI goes low, the first

data word ripples through to the output (see

Figure 1). As the FIFO fills up, the data words

stack up in the order they were written. When the

FIFO is full, additional shift-in pulses have no

9 10 11 12 13

effect. Data is shifted out of memory on the falling edge of the shift-out (SO) input (see Figure 2). When the FIFO

is empty, additional SO pulses have no effect. The last data word remains at the outputs until a new word falls

through or reset (RST) goes low.

Status of the SN74ALS235 FIFO memory is monitored by the output-ready (OR), input-ready (IR),

almost-full/almost-empty (AF/AE), and half-full (HF) flags. When OR is high, valid data is available at the

outputs. OR is low when SO is high and stays low when the FIFO is empty. IR is high when the inputs are ready

to receive more data. IR is low when SI is high and stays low when the FIFO is full. AF/AE is high when the FIFO

contains eight or less words (see Figure 5) or 56 or more words (see Figure 6). AF/AE is low when the FIFO

contains between nine and 55 words. HF is high when the FIFO contains 32 or more words and is low when

the FIFO contains 31 words or less (see Figure 7).

When the FIFO is empty, input data is shifted to the output automatically when SI goes low. If SO is held high

during this time, the OR flag pulses high indicating valid data at the outputs (see Figure 3).

WhentheFIFOisfull, datacanbeshiftedinautomaticallybyholdingSIhighandtakingSOlow. Onepropagation

delay after SO goes low, IR will go high. If SI is still high when IR goes high, data at the inputs are automatically

shifted in. Since IR is normally low when the FIFO is full and SI is high, only a high-level pulse is seen on the

IR output.

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.

IMPACT is a trademark of Texas Instruments Incorporated.

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...15

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与SN74ALS235N相关器件

型号	品牌	获取价格	描述	数据表
SN74ALS235N3	TI	获取价格	SN74ALS235N3
SN74ALS236	TI	获取价格	64 】 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN74ALS236D	TI	获取价格	64X4 OTHER FIFO, 22ns, PDSO16
SN74ALS236D3	TI	获取价格	IC,FIFO,64X4,ASYNCHRONOUS,TTL,SOP,16PIN,PLASTIC
SN74ALS236DW	TI	获取价格	64 】 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN74ALS236DWR	TI	获取价格	64X4 OTHER FIFO, 22ns, PDSO16, PLASTIC, SO-16
SN74ALS236FN	TI	获取价格	64 】 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR
SN74ALS236FN3	TI	获取价格	IC,FIFO,64X4,ASYNCHRONOUS,TTL,LDCC,20PIN,PLASTIC
SN74ALS236FNR	TI	获取价格	64X4 OTHER FIFO, 22ns, PQCC20, PLASTIC, LCC-20
SN74ALS236N	TI	获取价格	64 】 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMOR

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