Rainbow Electronics DS1511 - Manual

1 of 20 REV: 030603
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GENERAL DESCRIPTION
The DS1501/DS1511 are full-function, year 2000-
compliant real-time clock/calendars (RTCs) with an
RTC alarm, watchdog timer, power-on reset, battery
monitors, 256 bytes NV SRAM, and a 32.768kHz
output. User access to all registers within the
DS1501/DS1511 is accomplished with a byte-wide
interface, as shown in Figure 8. The RTC registers
contain century, year, month, date, day, hours,
minutes, and seconds data in 24-hour binary-coded
decimal (BCD) format. Corrections for day of month
and leap year are made automatically.
APPLICATIONS
Remote Systems
Battery-Backed Systems
Telecom Switches
Office Equipment
Consumer Electronics
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS1501YN -40°C to +85°C 28 DIP (600 mil)
DS1501YEN -40°C to +85°C 28 TSOP
DS1501YSN -40°C to +85°C 28 SO (330 mil)
DS1501WN -40°C to +85°C 28 DIP (600 mil)
DS1501WEN -40°C to +85°C 28 TSOP
DS1501WSN -40°C to +85°C 28 SO (330 mil)
DS1511Y 0°C to +70°C 28 720-mil Module
DS1511W 0°C to +70°C 28 720-mil Module
Selector Guide appears at end of data sheet.
Typical Operating Circuits appears at end of data sheet.
FEATURES
§ BCD-Coded Century, Year, Month, Date, Day,
Hours, Minutes, and Seconds with Automatic
Leap-Year Compensation Valid Up to the Year
2100
§ Programmable Watchdog Timer and RTC Alarm
§ Century Register; Y2K-Compliant RTC
§ Automatic Battery Backup and Write Protection
to External SRAM
§ +3.3 or +5V Operation
§ Precision Power-On Reset
§ Power-Control Circuitry Support System Power-
On from Date/Day/Time Alarm or Key
Closure/Modem-Detect Signal
§ 256 Bytes Battery-Backed NV SRAM
§ Auxiliary Battery Input
§ Accuracy of DS1511 Better than ±1
Minute/Month at +25°C
§ Day-of-Week/Date Alarm Register
§ Crystal Select Bit Allow RTC to Operate with 6pF
or 12.6pF Crystal
§ Battery Voltage-Level Indicator Flags
§ Available as Chip (DS1501) or Standalone
Module with Embedded Battery and Crystal
(DS1511)
§ UL Recognized
PIN CONFIGURATION
DS1501/DS1511
Y2K Watchdog Real-Time Clocks
www.maxim-ic.com
TOP VIEW
Dallas
Semiconductor
DS1501
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SQW
GND
DQ7
DQ6
DQ5
DQ4
DQ3
WE
KS
OE
CE
V
CC
V
BAUX
V
BAT
X1
X2
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
PWR
RST
IRQ
DIP, SO
Pin Configurations are continued at end of data sheet.