DS1553 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM

19-5480; Rev 8/10
www.maxim-ic.com
DS1553
64kB, Nonvolatile, Year-2000-Compliant
Timekeeping RAM
GENERAL DESCRIPTION
The DS1553 is a full-function, year-2000-
compliant (Y2KC) real-time clock/calendar (RTC)
with an RTC alarm, watchdog timer, power-on
reset, battery monitor, and 8k x 8 nonvolatile static
RAM. User access to all registers within the
DS1553 is accomplished with a byte-wide
interface as shown in Figure 1. The RTC registers
contain century, year, month, date, day, hours,
minutes, and seconds data in 24-hour BCD format.
Corrections for day of month and leap year are
made automatically.
FEATURES
 Integrated NV SRAM, RTC, Crystal, Power-Fail
Control Circuit, and Lithium Energy Source
 Clock Registers are Accessed Identically to the
Static RAM; These Registers are Resident in the
16 Top RAM Locations
 Totally Nonvolatile with Over 10 Years of
Operation in the Absence of Power
 Precision Power-On Reset
 Programmable Watchdog Timer and RTC Alarm
 BCD-Coded Year, Month, Date, Day, Hours,
Minutes, and Seconds with Automatic Leap Year
Compensation Valid Up to the Year 2100
 Battery Voltage Level Indicator Flag
Pin Configurations appear at end of data sheet.
ORDERING INFORMATION
 Power-Fail Write Protection Allows for 10%
V_CC Power-Supply Tolerance
 Lithium Energy Source is Electrically
Disconnected to Retain Freshness Until Power is
Applied for the First Time
PART
VOLTAGE (V) TEMP RANGE
DS1553-85+
DS1553-100+
5.0
0°C to +70°C
5.0
0°C to +70°C
DS1553W-120+
3.3
0°C to +70°C
DS1553W-150+
3.3
0°C to +70°C
DS1553P-85+
5.0
0°C to +70°C
DS1553P-100+
5.0
DS1553WP-120+
3.3
0°C to +70°C
0°C to +70°C
DS1553WP-150+
3.3
0°C to +70°C
DS9034PCX+
3
0°C to +70°C
+Denotes a lead(Pb)-free/RoHS-compliant package.
*PowerCap required, must be ordered separately
**A “+” symbol anywhere on the top mark indicates a lead(Pb)-free package.
PIN-PACKAGE
28 EDIP (0.740)
28 EDIP (0.740)
28 EDIP (0.740)
28 EDIP (0.740)
34 PowerCap*
34 PowerCap*
34 PowerCap*
34 PowerCap*
—
TOP MARK**
DS1553+85
DS1553+100
DS1553W+120
DS1553W+150
DS1553P+85
DS1553P+100
DS1553WP+120
DS1553WP+150
DS9034PCX
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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