DS1248Y-70 Maxim Integrated Products, DS1248Y-70 Datasheet - Page 7
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DS1248Y-70
Manufacturer Part Number
DS1248Y-70
Description
Real Time Clock
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1248W-120.pdf
(18 pages)
Specifications of DS1248Y-70
Function
Clock, Calendar, NV Timekeeping RAM, Battery Backup
Rtc Memory Size
131072 B
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.5 V
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
Through Hole
Rtc Bus Interface
Phantom Clock, Parallel
Package / Case
eDIP
Time Format
HH:MM:SS:hh
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Part Number
Manufacturer
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DS1248/DS1248P 1024k NV SRAM with Phantom Clock
Figure 2. Phantom Clock Register Definition
AM/PM/12/24-MODE
Bit 7 of the hours register is defined as the 12-hour or 24-hour mode-select bit. When high, the 12-hour
mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24-hour
mode, bit 5 is the second 10-hour bit (20–23 hours).
OSCILLATOR AND RESET BITS
Bits 4 and 5 of the day register are used to control the RST and oscillator functions. Bit 4 controls the
RST (pin 1). When the RST bit is set to logic 1, the RST input pin is ignored. When the RST bit is set to
logic 0, a low input on the RST pin will cause the phantom clock to abort data transfer without changing
data in the watch registers. Bit 5 controls the oscillator. When set to logic 1, the oscillator is off. When set
to logic 0, the oscillator turns on and the watch becomes operational. These bits are shipped from the
factory set to a logic 1.
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