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參數(shù)資料
| 型號： | ST24LC21 |
| 廠商： | 意法半導體 |
| 英文描述： | 1Kb x8 DUAL MODE SERIAL EEPROM for VESA Plug&Play |
| 中文描述： | 1kB的x8串行EEPROM的雙模式為韋莎插頭 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 149K |
| 代理商： | ST24LC21 |
Symbol
Alt
Parameter
Min
Max
Unit
t
CH1CH2
(1)
t
R
Clock Rise Time
300
ns
t
CL1CL2
(1)
t
F
Clock Fall Time
300
ns
t
DH1DH2
(1)
t
R
SDA Rise Time
20
300
ns
t
DL1DL2
(1)
t
F
SDA Fall Time
20
300
ns
t
CHDX
(2)
t
SU:STA
Clock High to Input Transition
600
ns
t
CHCL
t
HIGH
Clock Pulse Width High
600
ns
t
DLCL
t
HD:STA
Input Low to Clock Low (START)
600
ns
t
CLDX
t
HD:DAT
Clock Low to Input Transition
0
μ
s
t
CLCH
t
LOW
Clock Pulse Width Low
1.3
μ
s
t
DXCX
t
SU:DAT
Input Transition to Clock Transition
100
ns
t
CHDH
t
SU:STO
Clock High to Input High (STOP)
600
ns
t
DHDL
t
BUF
Input High to Input Low (Bus Free)
1.3
μ
s
t
CLQV
t
AA
Clock Low to Data Out Valid
200
900
ns
t
CLQX
t
DH
Clock Low to Data Out Transition
200
ns
f
C
f
SCL
Clock Frequency
400
kHz
t
W
t
WR
Write Time
10
ms
Notes:
1. Sampled only, not 100% tested.
2. For a reSTART condition, or following a write cycle.
Table 7. AC Characteristics, I
2
C Bidirectional Mode for Clock Frequency = 400kHz
(T
A
= 0 to 70
°
C; V
CC
= 2.5V to 5.5V)
Data Input.
During data input the ST24LC21 sam-
ple the SDA bus signal on the rising edge of the
clock SCL. Note that for correct device operation
the SDA signal must be stable during the clock low
to high transition and the data must change ONLY
when the SCL line is low.
Memory Addressing.
To start communication be-
tween the bus master and the slave ST24LC21, the
master must initiate a START condition. Following
this, the master sends onto the SDA bus line 8 bits
(MSB first) corresponding to the device select code
(7 bits) and a READ or WRITE bit. The 4 most
significant bits of the device select code are the
device type identifier, corresponding to the I
2
C bus
definition. For these memories the 4 bits are fixed
as 1010b. The following 3 bits are Don’t Care. The
8th bit sent is the read or write bit (RW), this bit is
set to ’1’ for read and ’0’ for write operations. If a
match is found, the corresponding memory will
acknowledge the identification on the SDA bus
during the 9th bit time.
Write Operations
Following a START condition the master sends a
device select code with the RW bit reset to ’0’. The
memory acknowledges this and waits for a byte
address. After receipt of the byte address the de-
vice again responds with an acknowledge.
In I
2
C bidirectional mode, any write command with
VCLK = 0 will not modify data and will be acknow-
ledged on data bytes, as shown in Figure 11.
Byte Write.
In the Byte Write mode the master
sends one data byte, which is acknowledged by the
memory. The master then terminates the transfer
by generating a STOP condition.
Page Write.
The Page Write mode allows up to 8
bytes to be written in a single write cycle, provided
that they are all located in the same ’row’ in the
memory: that is the most significant memory ad-
dress bits are the same. The master sends from
one up to 8 bytes of data, which are each acknow-
ledged by the memory.
7/18
ST24LC21
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST24LC21B1TR | Controller IC; Package/Case:14-DIP; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):No; Mounting Type:Through Hole |
| ST24LC21M1TR | Pulse Width Modulation (PWM) Controller IC; Topology:Push Pull; Control Mode:Current; Number of PWM Outputs:1; Input Voltage Primary Min:10V; Input Voltage Primary Max:120V; Duty Cycle Max:50%; Oscillator Frequency Max, Fosc:1MHz |
| ST2600C | MOSFET, N, SO-8; Transistor type:MOSFET; Current, Id cont:13.4A; Resistance, Rds on:0.009R; Voltage, Vgs Rds on measurement:4.5V; Case style:SO-8 PowerPak; Charge, gate n-channel:50nC; Current, Idm pulse:50A; Depth, external:5.26mm; RoHS Compliant: Yes |
| ST280S04P1V | PHASE CONTROL THYRISTORS Stud Version |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST24LC21B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
| ST24LC21B1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| ST24LC21B1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1Kb x8 DUAL MODE SERIAL EEPROM for VESA Plug&Play |
| ST24LC21BB1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:I2C Serial EEPROM |
| ST24LC21BB1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1 Kbit x8 Dual Mode Serial EEPROM for VESA PLUG & PLAY |
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