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RL56ESM/3 Features:
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| The RL56ESM/3/RL56ESM/3E require 7.5V to 12V dual supplies. For applications where these supply voltages are not present, a DC-DC converter must be added. Due to the RL56ESM/3/RL56ESM/3Es low current con- sumption, a charge pump can provide the proper supply voltages and requires a minimal amount of board space and cost. |
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RL56ESM/3 (Absolute) Maximum Ratings:
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| The electrical placement of the RL56ESM/3 on a printed circuit card is such that it separates the host power supply and any on-board DC-to-DC converters (or LDOs) from the backend circuitry such as multiple DSPs, micropro- cessors and associated glue logic. The host supplies, and any other regulated voltages that will be switched by the device, are referred to as bus-side voltages. The voltages that are on the backend circuitry side of the switches are referred to as card-side voltages. |
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RL56ESM/3 Pinout:
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| This pin accepts an 8 kHz clock that synchronizes the out- put of the serial PCM data at the DT pin. This input is com- patible with various standards including IDL, Long Frame Sync, Short Frame Sync, and GCI formats. If both FST and FSR are held low for several 8 kHz frames, the device will power down. |
| The variance in output pulse width from device to device typically is less than 0.5% for given external timing components. An example of this distribution for the 221 is shown in Figure 3. Variations in output pulse width versus supply voltage and temperature for the 221 are shown in Figures 4 and 5, respectively. |
| The DS1543 is a full-function real-time clock/calendar (RTC) with a RTC alarm, watchdog timer, power- on reset, battery monitor, and 8k x 8 non-volatile static RAM. User access to all registers within the DS1543 is accomplished with a bytewide interface as shown in Figure 1. The RTC registers contain year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically. |
