DS17285 Datasheet, PDF (2/38 Pages) Dallas Semiconductor – 3V/5V Real-Time Clock

ORDERING INFORMATION
PART #
DESCRIPTION
DS17285XX-X RTC Chip
3 +3V operating range
5 +5V operating range
blank commercial temp range
N industrial temp range
blank 24-pin DIP
E 28- pin TSOP
S 24- pin SO
DS17287X-X RTC Module; 24-pin DIP
3 +3V operating rang
5 +5V operating range
blank commercial temp range
N industrial
DS17285/DS17287
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.
2 of 38