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DS1500
Y2K-Compliant Watchdog RTC with NV Control
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Status
Description
The DS1500 is a full-function, year 2000-compliant, real-time clock/calendar (RTC) with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on-board nonvolatile (NV) SRAM, NV control for backing up an external SRAM, and a 32.768kHz output. User access to all registers within the DS1500 is accomplished with a byte-wide interface as shown in Figure 7. 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.
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Data Sheet
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Key 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
- +5V or +3.3V Operation
- Precision Power-On Reset
- Power-Control Circuitry Supports System Power-On from Date/Day/Time Alarm or Key Closure
- 256 Bytes User NV RAM
- Auxiliary Battery Input
- Accuracy Better than ±1 Minute/Month at +25°C
- Day-of-Week/Date Alarm Register
- Battery Voltage-Level Indicator Flags
- Optional Industrial Temperature Range: -40°C to +85°C
- Underwriters Laboratories (UL) Recognized
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Applications/Uses
- Battery-Backed Systems
- Consumer Electronics
- Office Equipment
- Remote Systems
- Telecom Switches
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Key Specifications:
| Non-Volatile RAM Controllers |
| Part Number |
CE Cntrl. |
Smart Socket w/Int. Batt. |
Li Batt. Monitor |
Pwr. Fail Out |
RAMs Controlled |
VSUPPLY
(V) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| max w/pins |
See Notes |
| DS1500 |
Yes |
No |
Yes |
No |
1 |
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168.1 |
-40 to +85 |
$4.72 @1k |
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See All Non-Volatile RAM Controllers (13)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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| Timekeeping & Real-Time Clocks |
| Part Number |
Functions |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
CL
(pF) |
Memory Type |
Memory Size
(Bytes) |
Time of Day Alarms |
Integrated XTAL |
Budgetary Price |
| hh = sec/100 |
See Notes |
| DS1500 |
| NV SRAM Control | | Watchdog Timekeeper |
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YY-MM-DD/ HH:MM:SS |
Bytewide |
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NV SRAM |
256 |
1 |
No |
$4.72 @1k |
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See All Timekeeping & Real-Time Clocks (86)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Recommended Replacement |
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS1500WE
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N/A |
No Longer Available |
DS1500WE+
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TSOP;32 pin;168.1 mm²
Outline Drawing:21-0274 (PDF)
Land Pattern: 90-0320 (PDF)
Use pkgcode/variation: Z32-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS1500WE+
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Active |
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TSOP;32 pin;168.1 mm²
Outline Drawing:21-0274 (PDF)
Land Pattern: 90-0320 (PDF)
Use pkgcode/variation: Z32+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1500WEN+
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Active |
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TSOP;32 pin;168.1 mm²
Outline Drawing:21-0274 (PDF)
Land Pattern: 90-0320 (PDF)
Use pkgcode/variation: Z32+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1500YE+
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Active |
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TSOP;32 pin;168.1 mm²
Outline Drawing:21-0274 (PDF)
Land Pattern: 90-0320 (PDF)
Use pkgcode/variation: Z32+4*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS1500YEN+
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Active |
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TSOP;32 pin;168.1 mm²
Outline Drawing:21-0274 (PDF)
Land Pattern: 90-0320 (PDF)
Use pkgcode/variation: Z32+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-6130
Rev 3;
2011-12-14
This page last modified: 2011-12-14
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