DS1315_07 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – Phantom Time Chip

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DESCRIPTION
The DS1315 Phantom Time Chip is a
combination of a CMOS timekeeper and a
nonvolatile memory controller. In the absence of
power, an external battery maintains the
timekeeping operation and provides power for a
CMOS static RAM. The watch keeps track of
hundredths of seconds, seconds, minutes, hours,
day, date, month, and year information. The last
day of the month is automatically adjusted for
months with less than 31 days, including leap
year correction. The watch operates in one of two
formats: a 12-hour mode with an AM/PM
indicator or a 24-hour mode. The nonvolatile
controller supplies all the necessary support
circuitry to convert a CMOS RAM to a
nonvolatile memory. The DS1315 can be
interfaced with either RAM or ROM without
leaving gaps in memory.
PIN CONFIGURATIONS
X1 ¹
16
V_CC1
X2 ² _DS1315 ^{15 V}CC0
WE ³
14 BAT2
BAT1 4
13 RST
GND 5
12 OE
D6
11 CEI
Q7
10 CEO
GND ⁸
9 ROM/RAM
DIP (300 mils)
Pin Configurations continued at end of data sheet.
DS1315
Phantom Time Chip
FEATURES
Real-Time Clock Keeps Track of Hundredths
of Seconds, Seconds, Minutes, Hours, Days,
Date of the Month, Months, and Years
Adjusts for Months with Fewer than 31 Days
Automatic Leap Year Correction Valid Up to
2100
No Address Space Required to Communicate
with RTC
Provides Nonvolatile Controller Functions for
Battery Backup of SRAM
Supports Redundant Battery Attachment for
High-Reliability Applications
Full ±10% V_CC Operating Range
+3.3V or +5V Operation
Industrial (–45°C to +85°C) Operating
Temperature Ranges Available
Drop-In Replacement for DS1215
PIN DESCRIPTION
X1, X2
- 32.768 kHz Crystal Connection
WE
BAT1
GND
D
Q
- Write Enable
- Battery 1 Input
- Ground
- Data Input
- Data Output
ROM/ RAM - ROM/RAM Mode Select
CEO
- Chip Enable Output
CEI
- Chip Enable Input
OE
- Output Enable
RST
BAT2
V_CC0
V_CC1
- Reset
- Battery 2 Input
- Switched Supply Output
- Power Supply Input
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 062807