Purchase DS1742, In-stock DS1742 From SeekIC.
Part Number: DS1742
Description: The DS1742 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 2k x 8 n...
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DS1742
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General Description
DS1742 General Description
The DS1742 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 2k x 8 non-volatile static RAM. User access to all registers within the DS1742 is accomplished with a bytewide interface as shown in Figure 1. The Real Time Clock (RTC) information and control bits reside in the eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day of the month and leap year are made automatically.
DS1742 Maximum Ratings
Voltage on Any Pin Relative to Ground -0.3V to +6.0V
Operating Temperature 0°C to 70°C
Storage Temperature -20°C to +70°C
Soldering Temperature See J-STD-020A Specification (See Note 7)
7. Real Time Clock 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-solder cleaning with water washing techniques is acceptable, provided that ultrasonic vibration is not used to prevent damage to the crystal.
DS1742 Features
Integrated NV SRAM, real time clock,
crystal, power-fail control circuit and lithium energy source
Clock registers are accessed identical to the
static RAM. These registers are resident in the eight top RAM locations
Century byte register
Totally nonvolatile with over 10 years of operation in the absence of power
BCD coded century, 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% VCC power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is applied for the first time
Standard JEDEC bytewide 2k x 8 static RAM pinout
Quartz accuracy ±1 minute a month @ 25°C, factory calibrated
crystal, power-fail control circuit and lithium energy source
Clock registers are accessed identical to the
static RAM. These registers are resident in the eight top RAM locations
Century byte register
Totally nonvolatile with over 10 years of operation in the absence of power
BCD coded century, 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% VCC power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is applied for the first time
Standard JEDEC bytewide 2k x 8 static RAM pinout
Quartz accuracy ±1 minute a month @ 25°C, factory calibrated
DS1742 Connection Diagram
DS1742
PDF/DataSheet Download
- Datasheet: DS1742
- File Size: 356067 KB
- Manufacturer: Dallas
- Click here to Download
- ·DS1
- Linear
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- ·DS1000
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
- ·DS1000-100
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
- ·DS1000-125
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
- ·DS1000-150
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
- ·DS1000-175
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
- ·DS1000-20
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
- ·DS1000-200
- DALLAS [Dallas Semiconducotr]
- 5-Tap Silicon Delay Line
- 67189 KB
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