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DS1330Y/AB
READ MODE
The DS1330 devices execute a read cycle whenever WE (Write Enable) is inactive (high) and CE (Chip
Enable) and OE (Output Enable) are active (low). The unique address specified by the 15 address inputs
(A 0 – A 14 ) defines which of the 32,768 bytes of data is to be accessed. Valid data will be available to the
eight data output drivers within t ACC (Access Time) after the last address input signal is stable, providing
that CE and OE (Output Enable) access times are also satisfied. If OE and CE access times are not
satisfied, then data access must be measured from the later occurring signal ( CE or OE ) and the limiting
parameter is either t CO for CE or t OE for OE rather than address access.
WRITE MODE
The DS1330 devices execute a write cycle whenever the WE and CE signals are in the active (low) state
after address inputs are stable. The later-occurring falling edge of CE or W E will determine the start of
the write cycle. The write cycle is terminated by the earlier rising edge of CE or WE . All address inputs
must be kept valid throughout the write cycle. WE must return to the high state for a minimum recovery
time (t WR ) before another cycle can be initiated. The OE control signal should be kept inactive (high)
during write cycles to avoid bus contention. However, if the output drivers are enabled ( CE and OE
active) then WE will disable the outputs in t ODW from its falling edge.
DATA RETENTION MODE
The DS1330AB provides full-functional capability for V CC greater than 4.75V and write protects by
4.5V. The DS1330Y provides full-functional capability for V CC greater than 4.5V and write protects by
4.25V. Data is maintained in the absence of V CC without any additional support circuitry. The NV
SRAMs constantly monitor V CC . Should the supply voltage decay, the NV SRAMs automatically write
protect themselves, all inputs become “don’t care,” and all outputs become high-impedance. As V CC falls
below approximately 2.7V, the power switching circuit connects the lithium energy source to RAM to
retain data. During power-up, when V CC rises above approximately 2.7V, the power switching circuit
connects external V CC to the RAM and disconnects the lithium energy source. Normal RAM operation
can resume after V CC exceeds 4.75V for the DS1330AB and 4.5V for the DS1330Y.
SYSTEM POWER MONITORING
DS1330 devices have the ability to monitor the external V CC power supply. When an out-of-tolerance
power supply condition is detected, the NV SRAMs warn a processor-based system of impending power
failure by asserting RST . On power-up, RST is held active for 200ms nominal to prevent system
operation during power-on transients and to allow t REC to elapse. RST has an open drain output driver.
BATTERY MONITORING
The DS1330 devices automatically perform periodic battery voltage monitoring on a 24-hour time
interval. Such monitoring begins within t REC after V CC rises above V TP and is suspended when power
failure occurs.
After each 24-hour period has elapsed, the battery is connected to an internal 1M ? test resistor for one
second. During this one second, if battery voltage falls below the battery voltage trip point (2.6V), the
battery warning output BW is asserted. Once asserted, BW remains active until the module is replaced.
The battery is still retested after each V CC power-up, however, even if BW is active. If the battery voltage
is found to be higher than 2.6V during such testing, BW is de-asserted and regular 24-hour testing
resumes. BW has an open drain output driver.
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