DS17885-DS17887 DALLAS [Dallas Semiconductor], DS17885-DS17887 Datasheet - Page 2

• Manufacturer Part Number: DS17885-DS17887
• Description: 3V/5V Real-Time Clock
• Manufacturer: DALLAS [Dallas Semiconductor]

ORDERING INFORMATION
PART #
DS17885XX-X RTC Chip
DS17887X-X
PIN DESCRIPTION
X1
X2
AD0–AD7 - Multiplexed Address/Data Bus
ALE
SQW
VCC
GND
VBAT
VBAUX
NC
DESCRIPTION
The DS17885/DS17887 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 DS17885 also
incorporates a number of enhanced features including a silicon serial number, power-on/off control
circuitry, 114 bytes of user NV SRAM plus 8kB of additional NV RAM, and 32.768kHz output for
sustaining power management activities.
CS
RCLR
PWR
KS
WR
RD
IRQ
- Crystal Input
- Crystal Output
- RAM Clear Input
- Power-On Interrupt Output (Open Drain)
- Kickstart Input
- RTC Chip-Select Input
- RTC Address Strobe
- RTC Write Data Strobe
- RTC Read Data Strobe
- Interrupt Request Output (Open Drain)
- Square-Wave Output
- +3V or +5V Main Supply
- Ground
- Battery + Supply
- Auxiliary Battery Supply
- No Connect
blank 24-pin DIP
E
S
blank commercial temp range
N
blank commercial temp range
N
RTC Module; 24-pin DIP
DESCRIPTION
3
5
3
5
28- pin TSOP
24- pin SO
industrial temp range
industrial
+3V operating range
+5V operating range
+3V operating rang
+5V operating range
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