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參數(shù)資料
| 型號(hào)： | M48T12 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM |
| 中文描述： | 16千位2KB的x8計(jì)時(shí)器[靜態(tài)存儲(chǔ)器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 94K |
| 代理商： | M48T12 |
AI01019
5V
OUT
CL = 100pF
CL includes JIG capacitance
1.8k
DEVICE
UNDER
TEST
1k
Figure 4. AC Testing Load Circuit
Input Rise and Fall Times
≤ 5ns
Input Pulse Voltages
0V to 3V
Input and Output Timing Ref. Voltages
1.5V
Note that Output Hi-Z is defined as the point where data is no
longer driven.
Table 4. AC Measurement Conditions
AI01329
LITHIUM
CELL
OSCILLATOR AND
CLOCK CHAIN
VPFD
VCC
VSS
32,768 Hz
CRYSTAL
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
8 x 8 BiPORT
SRAM ARRAY
2040 x 8
SRAM ARRAY
A0-A10
DQ0-DQ7
E
W
G
POWER
BOK
Figure 3. Block Diagram
Byte 7F8h is the clock control register. This byte
controls user access to the clock information and
also stores the clock calibration setting.
The eight clock bytes are not the actual clock
counters themselves; they are memory locations
consisting of BiPORT
read/write memory cells.
The M48T02/12 includes a clock control circuit
which updates the clock bytes with current informa-
tion once per second. The information can be
accessed by the user in the same manner as any
other location in the static memory array.
The M48T02/12 also has its own Power-fail Detect
circuit. The control circuitry constantlymonitors the
single 5V supply for an out of tolerance condition.
When VCC is out of tolerance, the circuit write
protects the SRAM, providing a high degree of data
security in the midst of unpredictable system op-
eration brought on by low VCC.As VCC falls below
approximately3V, the control circuitry connectsthe
battery which maintains data and clock operation
until valid power returns.
3/15
M48T02, M48T12
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PDF描述 |
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| M48T12-150PC1 | 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM |
| M48T12-200PC1 | 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM |
| M48T12-70PC1 | 16 Kbit 2Kb x8 TIMEKEEPER[ SRAM |
| M4R16XBJFREQ | CRYSTAL OSCILLATOR, CLOCK, 19.44 MHz - 200 MHz, PECL OUTPUT |
| M4R76ZQJFREQ | CRYSTAL OSCILLATOR, CLOCK, 19.44 MHz - 160 MHz, PECL OUTPUT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T12-120PC1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CMOS 8K x 8 TIMEKEEPER SRAM |
| M48T12-150PC1 | 功能描述:實(shí)時(shí)時(shí)鐘 16K (2Kx8) 150ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M48T12-150PC1 | 制造商:STMicroelectronics 功能描述:SRAM TIMEKEEPER 16K 48T12 DIP24 |
| M48T12-150PC1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER㈢ SRAM |
| M48T12-200PC1 | 功能描述:實(shí)時(shí)時(shí)鐘 16K (2Kx8) 200ns RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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