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P93U422-35CMB 参数 Datasheet PDF下载

P93U422-35CMB图片预览
型号: P93U422-35CMB
PDF下载: 下载PDF文件 查看货源
内容描述: HIGH SPEED 256 ×4的静态CMOS RAM [HIGH SPEED 256 x 4 STATIC CMOS RAM]
分类和应用: 存储内存集成电路静态存储器
文件页数/大小: 10 页 / 217 K
品牌: PYRAMID [ PYRAMID SEMICONDUCTOR CORPORATION ]
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P93U422  
FUNCTIONALDESCRIPTION  
An active LOW write enable (WE) controls the writing/  
reading operation of the memory. When chip select one  
(CS1)and writeenable(WE)areLOWand chipselecttwo  
(CS2) is HIGH, the information on data inputs (D0 through  
D3) is written into the addressed memory word and  
preconditions the output circuitry so that true data is  
present at the outputs when the write cycle is complete.  
This preconditioning operation insures minimum write  
recovery times by eliminating the “write recovery glitch.”  
Readingisperformedwithchipselctone (CS1)LOW, chip  
select two (CS2) HIGH, write enable (WE) HIGH and  
output enable (OE) LOW. The information stored in the  
addressed word is read out on the noninverting outputs  
(O0 through O3). The outputs of the memory go to an  
inactive high impedance state whenever chip select one  
(CS1) is HIGH, or during the write operation when write  
enable (WE) is LOW.  
TRUTHTABLE  
Mode  
CS2 CS1 WE OE  
Output  
High Z  
High Z  
High Z  
DOUT  
Notes: H = HIGH  
Standby  
Standby  
DOUTDisabled  
Read  
L
X
H
L
X
X
X
H
L
X
X
H
L
L = Low  
X = Don't Care  
X
H
H
H
HIGH Z = Implies outputs are disabled or off. This  
condition is defined as high impedance state  
for the P93U422.  
L
L
Write  
X
High Z  
SWITCHINGCHARACTERISTICS(5,6)  
Over Operating Range (Commercial and Military)  
P93U422  
Description  
Delay from Address to Output (Address Access Time) (See Fig. 2)  
Unit  
Parameters  
Max.  
Min.  
(7)  
tPLH(A)  
tPLH(A)  
35  
ns  
ns  
(7)  
tPZH (CS1, CS2)(8)  
25  
25  
25  
Delay from Chip Select to Active Output and Correct Data (See Fig. 2)  
tPZL (CS1, CS2)(8)  
tPZH (WE)(8)  
tPZL (WE)(8)  
Delay from Write Enable to Active Output and Correct Data (Write Recovery)  
(See Fig. 1)  
ns  
ns  
tPZH (OE)(8)  
Delay from Output Enable to Active Output and Correct Data (See Fig. 2)  
tPZL (OE)(8)  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
tS(A)  
Setup Time Address (Prior to Initiation of Write) (See Fig. 1)  
Hold Time Address (After Termination of Write) (See Fig. 1)  
Setup Time Data Input (Prior to Initiation of Write) (See Fig. 1)  
Hold Time Data Input (After Termination of Write) (See Fig. 1)  
Setup Time Chip Select (Prior to Initiation of Write) (See Fig. 1)  
Hold Time Chip Select (After Termination of Write) (See Fig. 1)  
5
5
5
5
5
5
th(A)  
tS(DI)  
th(DI)  
tS (CS1, CS2)  
th (CS1, CS2)  
tpw(WE)  
20  
Minimum Write Enable Pulse Width (to Insure Write) (See Fig. 1)  
tPHZ (CS1, CS2)(8)  
30  
Delay from Chip Select to Inactive Output (HIGH Z) (See Fig. 2)  
ns  
tPLZ (CS1, CS2)(8)  
tPHZ (WE)(8)  
tPLZ (WE)(8)  
Delay from Write Enable to Inactive Output (HIGH Z) (See Fig. 1)  
Delay from Output Enable to Inactive Output (HIGH Z) (See Fig. 2)  
30  
30  
ns  
ns  
tPHZ (OE)(8)  
tPLZ (OE)(8)  
Document # SRAM102 REV A  
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