- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄371399 > 24LCS21A (Microchip Technology Inc.) 1K 2.5V Dual Mode I 2 C Serial EEPROM PDF資料下載
參數(shù)資料
| 型號(hào)： | 24LCS21A |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1K 2.5V Dual Mode I 2 C Serial EEPROM |
| 中文描述： | 一千2.5V的雙模式的I 2 C串行EEPROM |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 115K |
| 代理商： | 24LCS21A |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)當(dāng)前第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
1996 Microchip Technology Inc.
Preliminary
DS21161C-page 11
24LCS21A
6.0
WRITE PROTECTION
When using the 24LCS21A in the Bi-directional Mode,
the VCLK pin can be used as a write protect control pin.
Setting VCLK high allows normal write operations,
while setting VCLK low prevents writing to any location
in the array. Connecting the VCLK pin to V
SS
would
allow the 24LCS21A to operate as a serial ROM,
although this configuration would prevent using the
device in the Transmit-Only Mode.
Additionally, Pin three performs a flexible write protect
function. The 24LCS21A contains a write-protection
control fuse whose factory default state is cleared.
Writing any data to address 7Fh (normally the
checksum in DDC applications) sets the fuse which
enables the WP pin. Until this fuse is set, the
24LCS21A is always write enabled (if VCLK = 1). After
the fuse is set, the write capability of the 24LCS21A is
determined by both VCLK and WP pins (Table 6-1).
TABLE 6-1:
WRITE PROTECT TRUTH
TABLE
VCLK
WP
Address
7Fh Written
Mode
for
00h - 7Fh
Read Only
R/W
R/W
Read Only
0
1
1
1
X
X
X
No
X
Yes
1/open
0
7.0
READ OPERATION
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
slave address is set to one. There are three basic types
of read operations: current address read, random read
and sequential read.
7.1
Current Address Read
The 24LCS21A contains an address counter that
maintains the address of the last word accessed,
internally incremented by one. Therefore, if the
previous access (either a read or write operation) was
to address n, the next current address read operation
would access data from address n + 1. Upon receipt of
the slave address with R/W bit set to one, the
24LCS21A issues an acknowledge and transmits the
eight bit data word. The master will not acknowledge
the transfer but does generate a stop condition and the
24LCS21A discontinues transmission (Figure 7-1).
FIGURE 7-1:
CURRENT ADDRESS READ
7.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
24LCS21A as part of a write operation. After the word
address is sent, the master generates a start condition
following the acknowledge. This terminates the write
operation, but not before the internal address pointer is
set. Then the master issues the control byte again but
with the R/W bit set to a one. The 24LCS21A will then
issue an acknowledge and transmits the 8-bit data
word. The master will not acknowledge the transfer but
does generate a stop condition and the 24LCS21A
discontinues transmission (Figure 7-2).
CONTROL
BYTE
A
C
K
S
P
DATA n
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
A
C
K
N
O
1 0 1 0 0 0 0 1
S
T
O
P
S
T
A
R
T
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 24LCS21 | 1K 2.5V Dual Mode I 2 C Serial EEPROM |
| 24LCS41A | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,2.5V雙模式,雙端口IIC串行EEPROM) |
| 24LCS41 | 1K/4K 2.5V Dual Mode, Dual Port IIC Serial EEPROM(1K/4K位,2.5V雙模式,雙端口IIC串行EEPROM) |
| 24LCS52 | Connectors |
| 24LC52-IP | 2K 2.5V I 2 C Serial EEPROM with Software Write Protect |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24LCS21A/P | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2.5V Dual Mode RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LCS21A/S | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPRO - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LCS21A/SN | 功能描述:電可擦除可編程只讀存儲(chǔ)器 2.5V Dual Mode RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| 24LCS21A/W | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPROM WAFER - Gel-pak, waffle pack, wafer, diced wafer on film |
| 24LCS21A/WF | 制造商:Microchip Technology Inc 功能描述:1K 2.5V DUAL MODE SERIAL EEPRO - Gel-pak, waffle pack, wafer, diced wafer on film |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。