STMicroelectronics M48T212A
The M48T212A is a self-contained device that includes 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. The 16 TIMEKEEPER Registers offer Century, Year, Month, Date, Day, Hour, Minute, Second, Control, Calibration, Alarm, Watchdog, and Flags. Externally attached static RAMs are controlled by the M48T212A via the E1CON and E2CON signals (see Table 4).| Part No. | M48T212A |
|---|---|
| Datasheet | M48T212A Download |
| Manufacturer |  STMicroelectronics |
| Description | 3.3V TIMEKEEPER CONTROLLER |
| Buy | Stock & Price |
DESCRIPTION
A built-in 32.768 kHz oscillator (external crystal controlled) is used for the clock/calendar function. Access to all TIMEKEEPER functions and the external RAM is the same as conventional byte-wide SRAM. Automatic backup and write protection for an external SRAM is provided through VOUT, E1CON and E2CON pins. (Users are urged to insure that voltage specifications, for both the controller chip and external SRAM chosen, are similar). 8 DQ0-DQ7 VSS VBAT– AI03047 March 2000 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 1/20 M48T212A Figure 2. SOIC Connections Table 1. Signal Names A0-A3 DQ0-DQ7 XO Address Inputs Data Inputs/Outputs Oscillator Output Oscillator Input Reset 1 Input Reset 2 Input Reset Output (Open Drain) Watchdog Input Bank Select Input Chip Enable Input External Chip Enable Input Output Enable Input Write Enable Input RAM Chip Enable 1 Output RAM Chip Enable 2 Output In...
