DS1511W ,Y2K-Compliant Watchdog Real-Time ClocksFEATURES The DS1501/DS1511 are full-function, year 2000- BCD-Coded Century, Year, Month, Date, D ..
DS1511W ,Y2K-Compliant Watchdog Real-Time ClocksELECTRICAL CHARACTERISTICS (V = 3.3V or 5V ±10%, T = 0°C to +70°C; V = 3.3V or 5V ±10%, T = -40°C t ..
DS1511W ,Y2K-Compliant Watchdog Real-Time ClocksAPPLICATIONS Accuracy of DS1511 Better than ±1 Remote Systems Minute/Month at +25°C Battery-Back ..
DS1511W+ ,Y2K-Compliant Watchdog Real-Time ClocksFEATURES BCD-Coded Century, Year, Month, Date, Day, The DS1501/DS1511 are full-function, year 200 ..
DS1511Y+ ,Y2K-Compliant Watchdog Real-Time Clocks DS1501/DS1511 Y2K-Compliant Watchdog Real-Time Clocks
DS1543 ,64K NV Real Time Clocks RAMPIN DESCRIPTION Battery voltage level indicator flagA0-A12 - Address Input Power-fail write prote ..
DTC144WET1 ,Bias Resistor TransistorFeatures(OUTPUT)PIN 1R1• Simplifies Circuit DesignBASE(INPUT)• Reduces Board SpaceR2• Reduces Compo ..
DTC144WS , DTA/DTC SERIES
DTC314TS , Digital transistors (built-in resistor)
DTC314TU , Digital transistors (built-in resistor)
DTC323TS , Digital transistors (built-in resistor)
DTC323-TS , Digital transistors (built-in resistor)
DS1501WEN-DS1501WSN-DS1501YN-DS1511W
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 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
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 +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 Stand-Alone Module with Embedded Battery and Crystal
(DS1511) UL Recognized
PIN CONFIGURATION
DS1501/DS1511
Y2K-Compliant Watchdog
Real-Time Clocks
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………………..……....-0.5V to +6.0V
Operating Temperature Range (Module)…………………………………………………………..………....0°C to +70°C
Operating Temperature Range, DS1501………………………………………………..-40°C to +85°C (Note 1)
Operating Temperature Range, DS1511……………………………………………………………….……..0°C to +70°C
Storage Temperature Range, DS1501…………………...…………………………………....-55°C to +125°C Storage Temperature Range, DS1511………………………………………………………………….…..-40°C to +70°C
Soldering Temperature (DIP, Module)….………………….+260°C Lead Temperature for 10 seconds (max) (Note 2)
Soldering Temperature (SO, TSOP)…….……………..See IPC/JEDEC J-STD-020A for Surface-Mount Devices
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS (VCC = 3.3V or 5V ±10%, TA = 0°C to +70°C; VCC = 3.3V or 5V ±10%, TA = -40°C to +85°C.)
DC ELECTRICAL CHARACTERISTICS (VCC = 3.3V or 5V ±10%, TA = 0°C to +70°C; VCC = 3.3V or 5V ±10%, TA = -40°C to +85°C.)
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
DC ELECTRICAL CHARACTERISTICS (VCC = 0V; TA = 0°C to +70°C; VCC = 0V, TA = -40°C to +85°C.)
CRYSTAL SPECIFICATIONS* *The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations
for Dallas Real-Time Clocks for additional specifications.
AC OPERATING CHARACTERISTICS (VCC = 5V ±10%, TA = 0°C to +70°C; VCC = 5V ±10%, TA = -40°C to +85°C.)
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
AC OPERATING CHARACTERISTICS (VCC = 3.3V ±10%, TA = 0°C to +70°C; VCC = 3.3V ±10%, TA = -40°C to +85°C.)
Figure 1. Read Cycle Timing
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
Figure 2. Write Cycle Timing, Write-Enable Controlled Figure 3. Write Cycle Timing, Chip-Enable Controlled
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
Figure 4. Burst Mode Timing Waveform POWER-UP/DOWN CHARACTERISTICS
(TA = +25°C) CAPACITANCE
(TA = +25°C)
AC TEST CONDITIONS
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
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
WAKEUP/KICKSTART TIMING
(TA = +25°C) (Figure 7) Note: Time intervals shown above are referenced in Wakeup/Kickstart. Figure 7. Wakeup/Kickstart Timing Diagram
Note 1: Limits at -40°C are not production tested and are guaranteed by design.
Note 2: RTC modules can be successfully processed through conventional wave-soldering techniques as long as temperature exposure to the
lithium energy source contained within does not exceed +85°C. Post-sold cleaning with water-washing techniques is acceptable,
provided that ultrasonic vibration is not used to prevent damage to the crystal.
Note 3: Voltage referenced to ground.
Note 4: Outputs are open.
Note 5: The IRQ, PWR, and RST outputs are open drain.
Note 6: If VPF is less than VBAT and VBAUX, the device power is switched from VCC to the greater of VBAT or VBAUX when VCC drops below VPF. If VPF
is greater than VBAT and VBAUX, the device power is switched from VCC to the greater of VBAT or VBAUX when VCC drops below the greater
of VBAT or VBAUX.
Note 7: VBAT or VBAUX current. Using a 32,768Hz crystal connected to X1 and X2.
Note 8: These parameters are sampled with a 5pF load and are not 100% tested.
Note 9: tDR is the amount of time that the internal battery can power the internal oscillator and internal registers of the DS1511.
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
PIN DESCRIPTION
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
Figure 8. Block Diagram Figure 9. Typical Crystal Layout
