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參數(shù)資料
| 型號： | M48T212Y-70MH1 |
| 廠商： | 意法半導體 |
| 英文描述： | 5V/3.3V TIMEKEEPER[ CONTROLLER |
| 中文描述： | 5V/3.3V計時[控制器 |
| 文件頁數(shù)： | 1/23頁 |
| 文件大?。?/td> | 150K |
| 代理商： | M48T212Y-70MH1 |
1/23
April 2000
M48T212Y
M48T212V
5V/3.3V TIMEKEEPER
CONTROLLER
I
CONVERTS LOW POWER SRAM into
NVRAMs
I
YEAR 2000 COMPLIANT (4-Digit Year)
I
BATTERY LOW FLAG
I
INTEGRATED REAL TIME CLOCK,
POWER-FAIL CONTROL CIRCUIT, BATTERY
and CRYSTAL
I
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
I
WATCHDOG TIMER
I
CHOICE of WRITE PROTECT VOLTAGES
(V
PFD
= Power-fail Deselect Voltage):
– M48T212Y: 4.2V
≤
V
PFD
≤
4.5V
– M48T212V: 2.7V
≤
V
PFD
≤
3.0V
I
MICROPROCESSOR POWER-ON RESET
I
PROGRAMMABLE ALARM OUTPUT ACTIVE
in the BATTERY BACKED-UP MODE
I
PACKAGING INCLUDESa44-LEADSOIC and
SNAPHAT
TOP (to be Ordered Separately)
DESCRIPTION
The M48T212Y/V are self-contained devices that
include a real time clock (RTC), programmable
alarms, a watchdog timer, and two external chip
enable outputs which provide control of up to four
(two in parallel) external low-power static RAMs.
Access to all TIMEKEEPER
functions and the
external RAM is the same as conventional byte-
wide SRAM. The16TIMEKEEPER Registersoffer
Century, Year, Month, Date, Day, Hour, Minute,
Second, Calibration,Alarm, Watchdog, and Flags.
Externally attached static RAMs are controlled by
the M48T212Y/V via the E1
CON
and E2
CON
sig-
nals (see Table 4).
The 44 pin 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT housing contain-
ing the battery and crystal. The unique design
allows the SNAPHAT battery package to be
mounted on top of the SOIC package after the
completion of the surface mount process.
Figure 1. Logic Diagram
AI03019
4
A0-A3
A
DQ0-DQ7
VCC
M48T212Y
M48T212V
G
VSS
8
EX
E2CON
E1CON
W
RSTIN2
RSTIN1
RST
IRQ/FT
VOUT
WDI
E
VCCSW
SOH44 (MH)
SNAPHAT (SH)
Battery
44
1
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T212Y-70MH1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH1F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-70MH6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-70MH6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
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