Rainbow-electronics DS17287 Manuel d'utilisateur télécharger pdf (Page 2)

DS17285/DS17287

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ORDERING INFORMATION

PART # DESCRIPTION

DS17285XX-X RTC Chip

DS17287X-X RTC Module; 24-pin DIP

PIN DESCRIPTION

X1 - Crystal Input

X2 - Crystal Output

RCLR - RAM Clear Input

AD0–AD7 - Multiplexed Address/Data Bus

PWR - Power-On Interrupt Output (Open Drain)

KS - Kickstart Input

CS - RTC Chip-Select Input

ALE - RTC Address Strobe

WR - RTC Write Data Strobe

RD - RTC Read Data Strobe

IRQ - Interrupt Request Output (Open Drain)

SQW - Square-Wave Output

VCC - +3V or +5V Main Supply

GND - Ground

VBAT - Battery + Supply

VBAUX - Auxiliary Battery Supply

NC - No Connect

DESCRIPTION

The DS17285/DS17287 are real-time clocks (RTCs) designed as successors to the industry standard

DS1285, DS1385, DS1485, DS1585, and DS1685 PC real-time clocks. These devices provide the

industry standard DS1285 clock function with either +3V or +5V operation. The DS17285 also

incorporates a number of enhanced features including a silicon serial number, power-on/off control

circuitry, 114 bytes of user NV SRAM plus 2kB of additional NV RAM, and 32.768kHz output for

sustaining power management activities.

3 +3V operating rang

5 +5V operating range

blank commercial temp range

industrial

3 +3V operating range

5 +5V operating range

blank commercial temp range

industrial temp range

blank 24-pin DIP

E 28- pin TSOP

S 24- pin SO

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Rainbow-electronics DS17287 Manuel d'utilisateur Page 2