DS1743P-100IND 查看數據表（PDF） - Maxim Integrated

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DS1743P-100IND

Y2K-Compliant, Nonvolatile Timekeeping RAMs

Maxim Integrated 

DS1743/DS1743P Y2K-Compliant, Nonvolatile Timekeeping RAMs

The pre-existing contents of the Control register bits 0:5 (Century value) will not be modified by a write

cycle to Control if the R bit is being cleared to 0 in that write operation.

STOPPING AND STARTING THE CLOCK OSCILLATOR

The clock oscillator may be stopped at any time. To increase the shelf life, the oscillator can be turned off

to minimize current drain from the battery. The OSC bit is the MSB (bit 7) of the seconds registers, see

Table 2. Setting it to a 1 stops the oscillator.

FREQUENCY TEST BIT

As shown in Table 2, bit 6 of the day byte is the frequency test bit. When the frequency test bit is set to

logic 1 and the oscillator is running, the LSB of the seconds register will toggle at 512Hz. When the

seconds register is being read, the DQ0 line will toggle at the 512Hz frequency as long as conditions for

access remain valid (i.e., CE low, OE low, WE high, and address for seconds register remain valid and

stable).

CLOCK ACCURACY (DIP MODULE)

The DS1743 is guaranteed to keep time accuracy to within ±1 minute per month at +25°C. The RTC is

calibrated at the factory by Dallas Semiconductor using nonvolatile tuning elements, and does not require

additional calibration. For this reason, methods of field clock calibration are not available and not

necessary. The electrical environment also affects clock accuracy, so caution should be taken to place the

RTC in the lowest-level EMI section of the PC board layout. For additional information, please refer to

Application Note 58: Crystal Considerations with Dallas Real-Time Clocks.

CLOCK ACCURACY (PowerCap MODULE)

The DS1743 and DS9034PCX are each individually tested for accuracy. Once mounted together, the

module will typically keep time accuracy to within ±1.53 minutes per month (35ppm) at +25°C. The

electrical environment also affects clock accuracy, so caution should be taken to place the RTC in the

lowest-level EMI section of the PC board layout. For additional information, please refer to Application

Note 58: Crystal Considerations with Dallas Real-Time Clocks.

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