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1024LI-42TE13 参数 Datasheet PDF下载

1024LI-42TE13图片预览
型号: 1024LI-42TE13
PDF下载: 下载PDF文件 查看货源
内容描述: [Power Supply Support Circuit, Fixed, 1 Channel, CMOS, PDIP8, PLASTIC, DIP-8]
分类和应用: 光电二极管
文件页数/大小: 17 页 / 107 K
品牌: CATALYST [ CATALYST SEMICONDUCTOR ]
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CAT1024, CAT1025  
Acknowledge Polling  
Preliminary Information  
memory array is protected and becomes read only. The  
CAT1025 will accept both slave and byte addresses,  
but the memory location accessed is protected from  
programming by the devices failure to send an  
acknowledge after the first byte of data is received.  
Disabling of the inputs can be used to take advantage of  
the typical write cycle time. Once the stop condition is  
issuedtoindicatetheendofthehostswriteopration, the  
CAT1024/25initiatestheinternalwritecycle.ACKpolling  
can be initiated immediately. This involves issuing the  
start condition followed by the slave address for a write  
operation.Ifthedeviceisstillbusywiththewriteoperation,  
no ACK will be returned. If a write operation has  
completed, an ACK will be returned and the host can  
then proceed with the next read or write operation.  
Read Operations  
The READ operation for the CAT1024/25 is initiated in  
the same manner as the write operation with one  
exception, that R/W bit is set to one. Three different  
READ operations are possible: Immediate/Current  
Address READ, Selective/Random READ and  
Sequential READ.  
WRITE PROTECTION  
The Write Protection feature (CAT1025 only) allows the  
user to protect against inadvertent memory array  
programming. If the WP pin is tied to VCC, the entire  
Figure 10. Immediate Address Read Timing  
S
T
A
R
T
S
T
O
P
BUS ACTIVITY:  
MASTER  
SLAVE  
ADDRESS  
SDA LINE  
S
P
A
C
K
N
O
DATA  
A
C
K
SCL  
SDA  
8
9
8TH BIT  
DATA OUT  
NO ACK  
STOP  
Doc. No. 3008, Rev. G  
12  
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