DS17487-5 Maxim Integrated Products, DS17487-5 Datasheet - Page 15
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DS17487-5
Manufacturer Part Number
DS17487-5
Description
IC RTC 5V 4K NV RAM 24-EDIP
Manufacturer
Maxim Integrated Products
Type
Clock/Calendar/NVSRAMr
Datasheet
1.DS17285S-5.pdf
(31 pages)
Specifications of DS17487-5
Memory Size
32K (4K x 8)
Time Format
HH:MM:SS (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
24-DIP (600 mil) Module
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Manufacturer
Quantity
Price
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Bits 3 to 0: Rate Selector Bits (RS3 to RS0). These
four rate-selection bits select one of the 13 taps on the
15-stage divider or disable the divider output. The tap
selected can be used to generate an output square
wave (SQW pin) and/or a periodic interrupt. The user
can do one of the following:
1) Enable the interrupt with the PIE bit;
Table 4. Periodic Interrupt Rate and Square-Wave Output Frequency
* RS3 to RS0 determine periodic interrupt rates as listed for E32K = 0.
EXT REG B
E32K
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
X
SELECT BITS REGISTER A
RS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
____________________________________________________________________
RS1
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
t
PI
2) Enable the SQW output pin with the SQWE or E32k
3) Enable both at the same time and the same rate; or
4) Enable neither.
Table 4 lists the periodic interrupt rates and the square-
wave frequencies that can be chosen with the RS bits.
PERIODIC INTERRUPT
bits;
1.953125ms
976.5625µs
3.90625ms
3.90625ms
122.070µs
244.141µs
488.281µs
7.8125ms
7.8125ms
15.625ms
31.25ms
62.5ms
125ms
250ms
500ms
RATE
None
*
Real-Time Clocks
SQW OUTPUT FREQUENCY
32.768kHz
8.192kHz
4.096kHz
2.048kHz
1.024kHz
256Hz
128Hz
512Hz
256Hz
128Hz
None
64Hz
32Hz
16Hz
8Hz
4Hz
2Hz
15