DS1501YZ+ Maxim Integrated Products, DS1501YZ+ Datasheet

IC RTC WDOG Y2KC 5.0V 28-SOIC

DS1501YZ+

Manufacturer Part Number
DS1501YZ+
Description
IC RTC WDOG Y2KC 5.0V 28-SOIC
Manufacturer
Maxim Integrated Products
Type
Clock/Calendar/WDT/NVSRAM/Y2Kr
Datasheet

Specifications of DS1501YZ+

Memory Size
2K (256 x 8)
Time Format
HH:MM:SS (24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
28-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
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
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
ORDERING INFORMATION
+Denotes a lead(Pb)-free/RoHS-compliant package.
*A “+” anywhere on the top mark denotes a lead(Pb)-free device. An N or IND denotes an industrial temperature device.
Ordering Information continued at end of data sheet.
DS1501W+
DS1501WE+
DS1501WEN+
DS1501WEN+T&R
DS1501WE+T&R
PART
Y2K-Compliant Watchdog Real-Time Clocks
VOLTAGE (V)
3.3
3.3
3.3
3.3
3.3
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
1 of 22
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
+3.3 (W) or +5V (Y) 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 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 (DS1501)
Battery Voltage-Level Indicator Flags
Available as Chip (DS1501) or Stand-Alone
Encapsulated DIP Module with Embedded
Battery and Crystal (DS1511)
Underwriters Laboratories (UL) Recognized
PIN-PACKAGE
28 DIP (0.600)
28 TSOP
28 TSOP
28 TSOP/Tape & Reel
28 TSOP/Tape & Reel
DS1501/DS1511
TOP MARK*
DS1501W
DS1501WE
DS1501WE
DS1501WEN
DS1501WEN
REV: 010909

Related parts for DS1501YZ+

DS1501YZ+ Summary of contents

Page 1

Y2K-Compliant Watchdog Real-Time Clocks 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 ...

Page 2

ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………………..……....-0.5V to +6.0V Operating Temperature Range, DS1501 Operating Temperature Range, DS1511……………………………………………………………….……..0°C to +70°C Storage Temperature Range, DS1501 Storage Temperature Range, DS1511………………………………………………………………….…..-40°C to +70°C Soldering Temperature (DIP, EDIP Module)…..………...….+260°C lead temperature ...

Page 3

DC ELECTRICAL CHARACTERISTICS ( 0°C to +70° PARAMETER Battery Current, BB32 = 0, EOSC = 0 Battery Current, BB32 = 0, EOSC = 1 V Current BB32 = 1, SQW Open BAUX ...

Page 4

AC OPERATING CHARACTERISTICS (V = 3.3V ±10 0°C to +70° PARAMETER Read Cycle Time Address Access Time Low-Z CE Access Time CE Data Off Time Low-Z (0°C to +85°C) ...

Page 5

Figure 2. Write Cycle Timing, Write-Enable Controlled A0– DQ0–DQ7 Figure 3. Write Cycle Timing, Chip-Enable Controlled A0- DQ0-DQ7 DS1501/DS1511 Y2KC Watchdog Real-Time Clocks t WC VALID WEW t ...

Page 6

Figure 4. Burst Mode Timing Waveform A 0 – – POWER-UP/DOWN CHARACTERISTICS PARAMETER Before Power-Fail IH V ...

Page 7

Figure 5. 3.3V Power-Up/Down Waveform Timing Figure 6. 5V Power-Up/Down Waveform Timing Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery-backup mode. DS1501/DS1511 Y2KC Watchdog Real-Time Clocks ...

Page 8

WAKEUP/KICKSTART TIMING (T = +25°C) (Figure 7) A PARAMETER Kickstart-Input Pulse Width Wakeup/Kickstart Power-On Timeout Note: Time intervals shown above are referenced in Wakeup/Kickstart. Figure 7. Wakeup/Kickstart Timing Diagram ...

Page 9

PIN DESCRIPTION PIN DIP, SO EDIP TSOP — 6–10 6–10 13–17 11–13, 11–13, 18–20, DQ0–DQ7 15–19 15–19 22– ...

Page 10

Figure 8. Block Diagram X1 32.768kHz CLOCK OSCILLATOR X2 V BAT V BAT POWER CONTROL V BAUX WRITE PROTECTION, AND POWER-ON GND RESET KS Figure 9. Typical Crystal Layout LOCAL GROUND PLANE (LAYER 2) CRYSTAL DS1501/DS1511 Y2KC Watchdog Real-Time Clocks ...

Page 11

DETAILED DESCRIPTION The DS1501/DS1511 RTC is a low-power clock/date device with a programmable day of week/date alarm. The DS1501/DS1511 is accessed through a parallel interface. The clock/date provides seconds, minutes, hours, day, date, month, and year information. The date at ...

Page 12

DATA RETENTION MODE The DS1501/DS1511 are fully accessible, and data can be written and read only when V However, when V falls below the power-fail point V CC registers and SRAM are blocked from any access. While in the data ...

Page 13

The third method of reading the time and date uses the alarm function. The alarm can be configured to activate once per second, and the time-of-day alarm-interrupt enable bit (TIE) is enabled. The TE bit should always be enabled. When ...

Page 14

USING THE CLOCK ALARM The alarm settings and control reside within registers 08h to 0Bh (Table 2). The TIE bit and alarm mask bits AM1 to AM4 must be set as described below for the IRQ or PWR outputs to ...

Page 15

Control A Register (0Eh) Bit 7 Bit 6 BLF1 BLF2 BLF1, Valid RAM and Time Bit 1 (0Eh Bit 7); BLF2, Valid RAM and Time Bit 2 (0Eh Bit 6) These status bits give the condition of any batteries attached ...

Page 16

Control B Register (0Fh) Bit 7 Bit TE, Transfer Enable Bit (0Fh Bit 7) When the TE bit is 1, the update transfer functions normally by advancing the counts once per second. When the TE bit is ...

Page 17

BAT regardless of the state of the watchdog enable (WDE) bit, to serve as an indication to the processor that a watchdog timeout has occurred. The watchdog timer operates ...

Page 18

The interrupt flag bit (either TDF or KSF) associated with the attempted power-on sequence remains set until cleared by software during a subsequent system power-on applied within the timeout period, the system power-on sequence continues, as shown ...

Page 19

... DS1501YN+ 5.0 DS1501YZ+ 5.0 DS1501YZN+ 5.0 DS1501YZN+T&R 5.0 DS1501YZ+T&R 5.0 DS1511W+ 3.3 DS1511Y+ 5.0 + Denotes a lead(Pb)-free/RoHS-compliant package “+” anywhere on the top mark denotes a lead(Pb)-free package IND denotes an industrial temperature device. DS1501/DS1511 Y2KC Watchdog Real-Time Clocks TEMP RANGE PIN-PACKAGE 28 DIP (0 ...

Page 20

PIN CONFIGURATIONS TOP VIEW PWR RST 4 25 Maxim IRQ 5 24 DS1501 DQ0 11 18 DQ1 ...

Page 21

TYPICAL OPERATING CIRCUITS V CC RPU V CC RST IRQ CPU A0–A4 DQ0–DQ7 V CC RPU V CC RST IRQ CPU A0–A4 DQ0–DQ7 PACKAGE INFORMATION For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE 28-pin ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time © 2009 Maxim Integrated Products DS1501/DS1511 Y2KC Watchdog Real-Time Clocks DESCRIPTION and V pin descriptions in the Pin BAT BAUX registered trademark of Maxim Integrated Products. PAGES CHANGED ...

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