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BU9877FV PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BU9877FV
기능 Serial interface IC for DIMMs supporting plug & play
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BU9877FV 데이터시트, 핀배열, 회로
Memory ICs
Serial interface IC for DIMMs sup-
porting plug & play
BU9877FV
The BU9877FV is a 2-k bit EEPROM with a write protect function, developed for DIMMs (Dual In-line Memory
Modules) containing a synchronous DRAM. This IC stores IDs in memory in order to enable Plug & Play functions.
Applications
168-pin and 144-pin DRAM modules containing syn-
chronous DRAM
Features
1) 2-k bit EEPROM with configuration of 256 words × 8
bits.
2) Compliance with SPD data format.
3) Dual-line serial (I2C bus) interface.
4) Protective functions enabled by a one-time ROM
and write protect pin.
Soft ware protection. as a one-time ROM: 00 to 7Fh.
Hard ware protection (WP pin): 80 to FFh.
5) Compact SSOP-B 8-pin package.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Applied voltage
Power dissipation
VCC – 0.3 ~ + 7.0
Pd 300
Storage temperature
Tstg
– 65 ~ + 125
Operating temperature
Topr
– 40 ~ + 85
Input voltage
— – 0.3 ~ VCC + 0.3
1 Reduced by 3.0mW for each increase in Ta of 1°C over 25°C.
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
VCC
2.7 ~ 5.5
Input voltage
VIN 0 ~ VCC
Unit
V
mW
°C
°C
V
Unit
V
V
1




BU9877FV pdf, 반도체, 판매, 대치품
Memory ICs
Circuit operation
(1) Synchronous data I / O timing
SCL
tR
t HD: STA
t SU: DAT
SDA
(input)
SDA
(output)
t BUF
BU9877FV
t F t HIGH
t LOW
t PD
t HD: DAT
t DH
SCL
SDA
t SU: STA
t HD: STA
START BIT
Fig. 5
• Reading of input is done at the rising edge of SCL.
• Output of data is synchronized to the falling edge of SCL.
t SU: STO
STOP BIT
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BU9877FV 전자부품, 판매, 대치품
Memory ICs
(10) Timing charts
Start condition
1
SCL
89
17 18
BU9877FV
Stop condition
26 27
SDA
1 0 1 0 A2 A1 A0 0
WA7 WA6
WA0
D7 D0
Slave address
Word address
Write data
ACK signal (output)
Fig. 7 Byte write cycle
• Data is written to the address specified by the word address (n address).
• After 8 bits of data are input, a stop bit is generated. This initiates writing of the data to the memory cell.
Start condition
Stop condition
1
SCL
89
18
SDA
1 0 1 0 A2 A1 A0 1
D7 D6 D5
D2 D1 D0 1
Slave address
ACK signal (output)
Fig. 8 Current read cycle
Read data
ACK signal (input)
• This IC has an internal circuit address counter to store the previously accessed address in the memory. If the pre-
vious command was a write command, the write word address data (n) is read, and if the previous command was
a read command, the read word address data (n) incremented by one address (n + 1) is read.
• If the ACK signal LOW following D0 is detected and no stop condition is sent from the master side, reading can be
continued sequentially to the next data.
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전력 반도체 판매 ( IGBT, TR 모듈, SCR, 다이오드 모듈 )

휴대전화 : 010-3582-2743


상호 : 아이지 인터내셔날

전화번호 : 051-319-2877, [ 홈페이지 ]



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부품번호상세설명 및 기능제조사
BU9877FV

Serial interface IC for DIMMs supporting plug & play

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