- 您现在的位置：买卖IC网 > PDF目录383302 > M48T02-200PC1 (意法半导体) 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM PDF资料下载
参数资料
| 型号： | M48T02-200PC1 |
| 厂商： | 意法半导体 |
| 英文描述： | 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM |
| 中文描述： | 16千位2KB的x8计时器[静态存储器 |
| 文件页数： | 12/15页 |
| 文件大小： | 94K |
| 代理商： | M48T02-200PC1 |
The second approach is better suited to a manu-
facturing environment, and involves the use of
some test equipment. When the Frequency Test
(FT)bit, the seventh-mostsignificantbit inthe Day
Register,is setto a’1’, andthe oscillatorisrunning
at 32,768 Hz, the LSB (DQ0) of the SecondsReg-
ister will toggle at 512 Hz. Any deviation from512
Hz indicates the degree and direction of oscillator
frequencyshift at the test temperature.For exam-
ple, a reading of 512.01024 Hz would indicate a
+20 ppm oscillator frequency error, requiring a
-10(WR001010) to be loaded into the Calibration
Byte for correction. Note that setting or changing
theCalibration Byte does notaffectthe Frequency
testoutputfrequency.The devicemustbe selected
and address 7F9h must be held constant when
readingthe 512 Hz on DQ0.
TheFTbitmustbesetusingthesamemethodused
to set the clock, usingthe Write bit.TheLSB of the
Seconds Register is monitored by holding the
M48T02/12 in an extended read of the Seconds
Register, without having the Read bit set. The FT
bitMUSTbe resetto ’0’fornormalclockoperations
to resume.
For more informationon calibration,see theAppli-
cationNote AN924 ”TIMEKEEPERCalibration”.
POWER SUPPLY DECOUPLING and UNDER-
SHOOTPROTECTION
I
CC
transients,including those producedby output
switching,canproducevoltagefluctuations,result-
ingin spikeson the V
CC
bus. Thesetransientscan
be reduced if capacitorsare used to store energy,
AI02169
VCC
0.1
μ
F
DEVICE
VCC
VSS
Figure 12. SupplyVoltage Protection
which stabilizesthe V
CC
bus.The energystored in
thebypasscapacitorswillbe releasedas lowgoing
spikes are generated or energy will be absorbed
when overshoots occur. A bypass capacitor value
of 0.1
μ
F (as shown in Figure 12) is recommended
in order to provide the neededfiltering.
In addition to transientsthat are causedby normal
SRAM operation, power cycling can generate
negative voltage spikes on V
CC
that drive it to
values below V
SS
by as muchas one Volt. These
negative spikes can cause data corruption in the
SRAM while in battery backup mode. To protect
from these voltage spikes, it is recommeded to
connecta schottkydiodefromV
CC
toV
SS
(cathode
connected to V
CC
, anode to V
SS
). Schottky diode
1N5817 is recommended for through hole and
MBRS120T3is recommendedfor surfacemount.
CLOCKOPERATION
(cont’d)
12/15
M48T02, M48T12
相关PDF资料 |
PDF描述 |
|---|---|
| M48T02-70PC1 | 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM |
| M50747-xxxFP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M50747 | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M50747-0F5SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M50747-131SP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T02-200PC1 | 制造商:STMicroelectronics 功能描述:IC SRAM TIMEKEEPER 16K |
| M48T02-200PC1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER㈢ SRAM |
| M48T02-70PC1 | 功能描述:实时时钟 16K (2Kx8) 70ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M48T02-70PC1 | 制造商:STMicroelectronics 功能描述:IC NVRAM 10 YR BATTERY 16K 48T02 |
| M48T02-70PC1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER㈢ SRAM |
发布紧急采购，3分钟左右您将得到回复。