DP8572AN National Semiconductor, DP8572AN Datasheet - Page 8

IC REAL TIME CLOCK W/RAM 24 DIP

DP8572AN

Manufacturer Part Number
DP8572AN
Description
IC REAL TIME CLOCK W/RAM 24 DIP
Manufacturer
National Semiconductor
Type
Clock/Calendar/NVSRAMr
Datasheet

Specifications of DP8572AN

Memory Size
44B
Time Format
HH:MM:SS:hh (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
24-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*DP8572AN
DP8572

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0
Functional Description
The DP8572A contains a fast access real time clock inter-
rupt control logic power fail detect logic and CMOS RAM
All functions of the RTC are controlled by a set of seven
registers A simplified 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
FIGURE 2 DP8572A Internal Memory Map
8
The memory map of the RTC is shown in the memory ad-
dressing table The memory map consists of two 31 byte
pages with a main status register that is common to both
pages A control bit in the Main Status Register is used to
select either page Figure 2 shows the basic concept
Page 0 contains all the clock timer functions while page 1
has scratch pad RAM The control registers are split into
two separate blocks to allow page 1 to be used entirely as
scratch pad RAM Again a control bit in the Main Status
Register is used to select either control register block
TL F 9980 – 7