參數(shù)資料
型號(hào)： FM93C66MT8
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： DRAM
英文描述： Microwire Serial EEPROM
中文描述： 256 X 16 MICROWIRE BUS SERIAL EEPROM, PDSO8
封裝： PLASTIC, TSSOP-8
文件頁(yè)數(shù)： 5/13頁(yè)
文件大?。?/td> 114K
代理商： FM93C66MT8
5
www.fairchildsemi.com
FM93C66 Rev. C.1
F
(
T
Pin Description
Chip Select (CS)
This is an active high input pin to FM93C66 EEPROM (the device)
and is generated by a master that is controlling the device. A high
level on this pin selects the device and a low level deselects the
device. All serial communications with the device is enabled only
when this pin is held high. However this pin cannot be permanently
tied high, as a rising edge on this signal is required to reset the
internal state-machine to accept a new cycle and a falling edge to
initiate an internal programming after a write cycle. All activity on the
SK, DI and DO pins are ignored while CS is held low.
Serial Clock (SK)
This is an input pin to the device and is generated by the master that
is controlling the device. This is a clock signal that synchronizes the
communication between a master and the device. All input informa-
tion (DI) to the device is latched on the rising edge of this clock input,
while output data (DO) from the device is driven from the rising edge
of this clock input. This pin is gated by CS signal.
Serial Input (DI)
This is an input pin to the device and is generated by the master
that is controlling the device. The master transfers Input informa-
tion (Start bit, Opcode bits, Array addresses and Data) serially via
this pin into the device. This Input information is latched on the
rising edge of the SCK. This pin is gated by CS signal.
Serial Output (DO)
This is an output pin from the device and is used to transfer Output
data via this pin to the controlling master. Output data is serially
shifted out on this pin from the rising edge of the SCK. This pin is
active only when the device is selected.
Microwire Interface
A typical communication on the Microwire bus is made through the
CS, SK, DI and DO signals. To facilitate various operations on the
Memory array, a set of 7 instructions are implemented on FM93C66.
The format of each instruction is listed under Table 1.
Instruction
Each of the 7 instructions is explained under individual instruction
descriptions.
Start bit
This is a 1-bit field and is the first bit that is clocked into the device
when a Microwire cycle starts. This bit has to be
“
1
”
for a valid cycle
to begin. Any number of preceding
“
0
”
can be clocked into the
device before clocking a
“
1
”
.
Opcode
This is a 2-bit field and should immediately follow the start bit.
These two bits (along with 2 MSB of address field) select a
particular instruction to be executed.
Address Field
This is an 8-bit field and should immediately follow the Opcode bits.
In FM93C66, all 8 bits are used for address decoding during READ,
WRITE and ERASE instructions. During all other instructions, the
MSB 2 bits are used to decode instruction (along with Opcode bits).
Data Field
This is a 16-bit field and should immediately follow the Address
bits. Only the WRITE and WRALL instructions require this field.
D15 (MSB) is clocked first and D0 (LSB) is clocked last (both
during writes as well as reads).
Table 1. Instruction set
Instruction
Start Bit
Opcode Field
Address Field
Data Field
READ
1
10
A7
A6
A5
A4
A3
A2
A1
A0
WEN
1
00
1
1
X
X
X
X
X
X
WRITE
1
01
A7
A6
A5
A4
A3
A2
A1
A0
D15-D0
WRALL
1
00
0
1
X
X
X
X
X
X
D15-D0
WDS
1
00
0
0
X
X
X
X
X
X
ERASE
1
11
A7
A6
A5
A4
A3
A2
A1
A0
ERAL
1
00
1
0
X
X
X
X
X
X
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參數(shù)描述
FM93C66N 功能描述:電可擦除可編程只讀存儲(chǔ)器 4K-Bit Serial 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
FM93C66V 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:4096-Bit Serial CMOS EEPROM (MICROWIRE⑩ Synchronous Bus)
FM93C66VM8 功能描述:電可擦除可編程只讀存儲(chǔ)器 SOIC-8 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
FM93C66VM8X 功能描述:電可擦除可編程只讀存儲(chǔ)器 SOIC-8 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
FM93C66VMT8 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Microwire Serial EEPROM
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