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参数资料
| 型号： | M48T129Y-85PM1 |
| 厂商： | 意法半导体 |
| 元件分类： | SRAM |
| 英文描述： | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| 中文描述： | 3.3 - 5V的1兆位的SRAM 128KB的x8计时器 |
| 文件页数： | 3/22页 |
| 文件大小： | 140K |
| 代理商： | M48T129Y-85PM1 |
3/22
M48T129Y, M48T129V
Figure 3. Block Diagram
AI02583
LITHIUM
CELL
OSCILLATOR
AND
CLOCK CHAIN
VPFD
VCC
VSS
32,768
Hz
CRYSTAL
VOLTAGE
SENSE
AND
SWITCHING
CIRCUITRY
16 x 8
TIMEKEEPER
REGISTERS
131,056 x 8
SRAM ARRAY
A0-A16
DQ0-DQ7
E
W
G
POWER
RST
IRQ/FT
cess. Insertion of the SNAPHAT housing after
reflow prevents potential battery damage due to
the hightemperatures required for device surface-
mounting. The SNAPHAT housing is keyed to pre-
vent reverse insertion.
The SNAPHAT battery package is shipped sepa-
rately in plastic anti-static tubes or in Tape & Reel
form. The part number is ”M4Txx-BR12SH1”.
The 32 pin 600 mil DIP Hybrid houses a controller
chip, SRAM, quartz crystal, and a long life lithium
button cell in a single package.
Figure 3 illustratesthe static memoryarray and the
quartz controlled clock oscillator. The clock loca-
tions contain the century, year, month, date, day,
hour, minute, and second in 24 hour BCD format.
Corrections for 28, 29 (leap year), 30, and 31 day
months are made automatically. The nine clock
bytes (1FFFFh-1FFF9h and 1FFF1h) are not the
actual clock counters, they are memory locations
consisting of BiPORT
read/write memory cells
within the static RAM array.
The M48T129Y/V includes a clock control circuit
which updates the clock bytes with current infor-
mation once per second. The information can be
accessed by the user in the same manner as any
other location in the static memory array. Byte
1FFF8h is the clock control register. Thisbyte con-
trols user access to the clock information and also
stores the clock calibration setting.
Byte 1FFF7h contains the watchdog timer setting.
The watchdog timer can generate either a reset or
an interrupt, depending on the state of the Watch-
dog Steering bit (WDS). Bytes 1FFF6h-1FFF2h in-
clude bits that, when programmed, provide for
clock alarm functionality. Alarms are activated
when the register content matches the month,
date, hours, minutes, and seconds of the clock
registers. Byte 1FFF1h contains century informa-
tion.Byte 1FFF0h contains additionalflag informa-
tion pertaining to the watchdog timer, the alarm
condition and the battery status. The M48T129Y/V
also has its own Power-Fail Detect circuit. This
control circuitry constantly monitors the supply
voltage for an out of tolerance condition. When
V
CC
is out of tolerance, the circuit write protects
the TIMEKEEPER register data and external
SRAM, providing data security in the midst of un-
predictable system operation. As V
CC
falls, the
control circuitry automatically switches to the bat-
tery, maintaining data and clock operation until
valid power is restored.
相关PDF资料 |
PDF描述 |
|---|---|
| M48T129V-70CS1 | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T129V-70PM1 | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T129 | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T129Y-70CS1 | Safety Sign; Legend:Danger Chlorine; External Height:7"; External Width:10"; Body Material:Polyester; Color:Red/Black RoHS Compliant: NA |
| M48T129V-85CS1 | 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T129YPM | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T129YSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM |
| M48T18 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V, 64Kbit (8 Kb x 8) TIMEKEEPER㈢ SRAM |
| M48T18-100MH1 | 功能描述:RAM其它 8KX8 TIMEKEEP 100NS RoHS:否 制造商:Freescale Semiconductor 封装:Tray |
| M48T18-100MH1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
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