Y2KC Nonvolatile Timekeeping RAM
DS1742 Y2KC Nonvolatile Timekeeping RAM
www.dalsemi.com
FEATURES
Integrated NV SRAM, real time clock, crystal, power-fa...
Description
DS1742 Y2KC Nonvolatile Timekeeping RAM
www.dalsemi.com
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
PIN ASSIGNMENT
A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC A8 A9 WE OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3
PIN DESCRIPTION
A0-A10
CE OE WE
VCC GND DQ0-DQ7
- Address Inputs - Chip Enable - Output Enable - Write Enable - Power Supply Input - Ground - Data Input/Outputs
ORDERING INFORMATION
DS1742-XXX (5V) -70 -100 70 ns access 100 ns access
DS1742W-XXX
(3.3V) -120 120 ns access -150 150 ns access
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 accom...
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