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DP8573A Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. DP8573A
Description  Real Time Clock (RTC)
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

DP8573A Datasheet(HTML) 5 Page - National Semiconductor (TI)

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Connection Diagrams
TLF9981 – 5
Top View
Order Number DP8573AN
See NS Package Number N24C
Plastic Chip Carrier
TLF9981 – 6
Top View
Order Number DP8573AV
See NS Package Number V28A
Functional Description
The DP8573A contains a fast access real time clock inter-
rupt control logic and power fail detect logic All functions of
the RTC are controlled by a set of seven registers A simpli-
fied block diagram that shows the major functional blocks is
given in
Figure 1
The blocks are described in the following sections
1 Real Time Clock
2 Oscillator Prescaler
3 Interrupt Logic
4 Power Failure Logic
5 Additional Supply Management
The memory map of the RTC is shown in the memory ad-
dressing table
(Figure 2) A control bit in the Main Status
Register is used to select either control register block
VBB and VCC may be applied in any sequence In order for
the power fail circuitry to function correctly whenever power
is off the VCC pin must see a path to ground through a
maximum of 1 MX The user should be aware that the con-
trol registers will contain random data The user should en-
sure that the RTC is not in test mode (see register descrip-
As shown in
Figure 2 the clock has 8 bytes of counters
which count from 1100 of a second to years Each counter
counts in BCD and is synchronously clocked The count se-
quence of the individual byte counters within the clock is
shown later in Table VII Note that the day of week day of
month and month counters all roll over to 1 The hours
counter in 12 hour mode rolls over to 1 and the AMPM bit
toggles when the hours rolls over to 12 (AM e 0 PM e 1)
The AMPM bit is bit D7 in the hours counter
All other counters roll over to 0 Upon initial application of
power the counters will contain random information
TLF9981 – 7
FIGURE 2 DP8573A Internal Memory Map

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