DS1553 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM

DS1553
64kB, Nonvolatile, Year-2000-Compliant
Timekeeping RAM
www.maxim-ic.com
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 bytewide 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.
ORDERING INFORMATION
PART
PIN-PACKAGE VCC (V)
DS1553-100
28 EDIP
5.0
DS1553-70
28 EDIP
5.0
DS1553P-100
34 PowerCap®
5.0
DS1553P-70
34 PowerCap
5.0
DS1553W-120 28 EDIP
3.3
DS1553W-150 28 EDIP
3.3
DS1553WP-120 34 PowerCap
3.3
DS1553WP-150 34 PowerCap
3.3
DS9034PCX*
—
—
*PowerCap required, must be ordered separately.
TOP MARK
DS1553-100
DS1553-070
DS1553P-100
DS1553P-70
DS1553W-120
DS1553W-150
DS1553WP-120
DS1553WP-150
DS9034PCX
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
§ 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
PIN CONFIGURATIONS
TOP VIEW
RST
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
28
2
27
3 ^DS1553 26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
WE
IRQ/FT
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
28-Pin Encapsulated Package
(700-mil Extended)
IRQ/FT 1
34
N.C.
N.C. 2
N.C. 3
DS1553
33
N.C.
32
N.C.
RST 4
31
N.C.
VCC
5
30
A12
WE ⁶
29
A11
OE ⁷
CE ⁸
DQ7 ⁹
28
A10
27
A9
26
A8
DQ6 ¹⁰
25
A7
DQ5 ¹¹
DQ4 12
DQ3 ¹³
24
A6
23
A5
22
A4
DQ2
DQ1
DQ0
GND
14
21
15
20
16
17
X1 GND VBAT X2
19
18
A3
A2
A1
A0
34-Pin PowerCap Module Board
(Uses DS9034PCX PowerCap)
PowerCap is a registered trademark of Dallas Semiconductor.
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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