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參數(shù)資料
| 型號： | 24C08B |
| 廠商： | Microchip Technology, Inc. |
| 元件分類： | EEPROM |
| 英文描述： | 8K 5.0V E-Temperature serial EEPROMs |
| 中文描述： | 8K的5.0V溫度串行EEPROM |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 111K |
| 代理商： | 24C08B |
1995 Microchip Technology Inc.
DS21081C-page 5
24C08B/16B
4.0
BUS CHARACTERISTICS
4.1
Device Addressing and Operation
A control byte is the first byte received following the
start condition from the master device. The control
byte consists of a four bit control code, for the 24C08B/
16B this is set as 1010 binary for read and write oper-
ations. The next three bits of the control byte are the
block select bits (B2, B1, B0). They are used by the
master device to select which of the eight 256 word
blocks of memory are to be accessed. These bits are
in effect the three most significant bits of the word
address.
The last bit of the control byte defines the operation to
be performed. When set to one a read operation is
selected, when set to zero a write operation is selected.
Following the start condition, the 24C08B/16B monitors
the SDA bus checking the device type identifier being
transmitted, upon a 1010 code the slave device outputs
an acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24C08B/16B will select a
read or write operation.
FIGURE 4-1:
CONTROL BYTE
ALLOCATION
Operation
Control
Code
Block Select
R/W
Read
1010
Block Address
1
Write
1010
Block Address
0
START
READ/WRITE
SLAVE ADDRESS
R/W
1
0
1
0
B2
B1
B0
A
5.0
WRITE OPERATION
5.1
Byte Write
Following the start condition from the master, the
device code (4 bits), the block address (3 bits), and the
R/W bit which is a logic low is placed onto the bus by
the master transmitter. This indicates to the addressed
slave receiver that a byte with a word address will fol-
low after it has generated an acknowledge bit during
the ninth clock cycle. Therefore the next byte transmit-
ted by the master is the word address and will be writ-
ten into the address pointer of the 24C08B/16B. After
receiving another acknowledge signal from the
24C08B/16B the master device will transmit the data
word to be written into the addressed memory location.
The 24C08B/16B acknowledges again and the master
generates a stop condition. This initiates the internal
write cycle, and during this time the 24C08B/16B will
not generate acknowledge signals (see Figure 5-1).
5.2
Page Write
The write control byte, word address and the first data
byte are transmitted to the 24C08B/16B in the same
way as in a byte write. But instead of generating a stop
condition the master transmits up to sixteen data bytes
to the 24C08B/16B which are temporarily stored in the
on-chip page buffer and will be written into the memory
after the master has transmitted a stop condition. After
the receipt of each word, the four lower order address
pointer bits are internally incremented by one. The
higher order seven bits of the word address remains
constant. If the master should transmit more than six-
teen words prior to generating the stop condition, the
address counter will roll over and the previously
received data will be overwritten. As with the byte write
operation, once the stop condition is received an inter-
nal write cycle will begin (see Figure 8-1).
FIGURE 5-1:
BYTE WRITE
S
T
O
P
SDA LINE
P
DATA
S
T
A
R
T
CONTROL
BYTE
S
WORD
ADDRESS
BUS ACTIVITY:
MASTER
BUS ACTIVITY:
A
C
K
A
C
K
A
C
K
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 24C16B | 16K 5.0V E-Temperature serial EEPROMs(16K位,5.0V，1M次擦寫周期，硬件寫保護(hù)，施密特觸發(fā)輸入的EEPROM) |
| 24C1024 | 2-wire Serial EEPROM 1M (131,072 x 8) |
| 24C128 | 2-Wire Serial EEPROMs |
| 24C256 | 2-Wire Serial EEPROMs |
| 24C128 | 131,072-bit 2-WIRE SERIAL CMOS EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 24C08B-/P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| 24C08B-/SL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| 24C08B-/SN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| 24C08B-E/P | 功能描述:IC EEPROM 8KBIT 100KHZ 8DIP RoHS:否 類別:集成電路 (IC) >> 存儲器 系列:- 標(biāo)準(zhǔn)包裝:96 系列:- 格式 - 存儲器:閃存 存儲器類型:FLASH 存儲容量:1M (64K x 16) 速度:150ns 接口:并聯(lián) 電源電壓:3 V ~ 3.6 V 工作溫度:0°C ~ 70°C 封裝/外殼:48-TFSOP（0.724"，18.40mm 寬） 供應(yīng)商設(shè)備封裝:48-TSOP 包裝:托盤 |
| 24C08B-E/SL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
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