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參數(shù)資料
| 型號： | SN74ALS236FN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 64 】 4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY |
| 中文描述： | 64】4異步先入先出存儲器 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 174K |
| 代理商： | SN74ALS236FN |
SN74ALS236
64
×
4
ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
SDAS107C – OCTOBER 1986 – REVISED APRIL 1998
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Asynchronous Operation
Organized as 64 Words by 4 Bits
Data Rates up to 30 MHz
3-State Outputs
Package Options Include Plastic
Small-Outline Package (DW), Plastic
J-Leaded Chip Carriers (FN), and Standard
Plastic 300-mil DIPs (N)
description
The SN74ALS236 is a 256-bit memory utilizing
advanced
low-power
technology. It features high speed with fast
fall-through times and is organized as 64 words by
4 bits.
Schottky
IMPACT
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
SN74ALS236 is designed to process data at rates
up to 30 MHz in a bit-parallel format, word by
word.
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
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 SN74ALS236 FIFO memory is monitored by the output-ready (OR) and input-ready (IR) 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.
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).
When the FIFO is full, data is shifted in automatically by holding SI high and taking SO low. One propagation
delay after SO goes low, IR goes high. If SI is still high when IR goes high, data at the inputs is 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 (see Figure 4).
Copyright
1998, 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.
IMPACT is a trademark of Texas Instruments Incorporated.
NC
IR
SI
D0
D1
D2
D3
GND
DW OR N PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
OR
Q0
NC
Q1
Q2
SI
D0
NC
D1
D2
FN PACKAGE
(TOP VIEW)
N
N
R
Q
S
D
G
N
V
C
I
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
SO
OR
Q0
Q1
Q2
Q3
RST
NC – No internal connection
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.
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PDF描述 |
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| SN74ALS240ADBR | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN74ALS240A-1DBR | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN74ALS240A-1DBRE4 | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN74ALS240A-1DBRG4 | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
| SN74ALS240A-1DWR | OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74ALS236N | 功能描述:先進先出 64 x 4 asynchronous 先進先出 memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲容量:4 Mbit 定時類型:Synchronous 組織:256 K x 18 最大時鐘頻率:100 MHz 訪問時間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝: |
| SN74ALS240A-1DBR | 功能描述:緩沖器和線路驅(qū)動器 Octal Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74ALS240A-1DBRE4 | 功能描述:緩沖器和線路驅(qū)動器 Octal Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74ALS240A-1DBRG4 | 功能描述:緩沖器和線路驅(qū)動器 Octal Buffer Drivers RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74ALS240A-1DW | 功能描述:緩沖器和線路驅(qū)動器 Octal Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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