DS1553 Maxim, DS1553 Datasheet - Page 18

• Manufacturer Part Number: DS1553
• Description: The DS1553 is a full-function, year-2000-compliant (Y2KC) real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and "8k x 8 nonvolatile static RAM (NV SRAM)
• Manufacturer: Maxim

AC TEST CONDITIONS
Output Load: 100 pF + 1TTL Gate
Input Pulse Levels: 0 to 3.0V
Timing Measurement Reference Levels:
Input Pulse Rise and Fall Times: 5ns
NOTES:
1) Voltage referenced to ground.
2) Typical values are at +25C and nominal supplies.
3) Outputs are open.
4) Battery switch over occurs at the lower of either the battery voltage or V
5) The
6) Data retention time is at +25C.
7) Each DS1553 has a built-in switch that disconnects the lithium source until V
8) Real-time clock modules (DIP) can be successfully processed through conventional wave-soldering
In addition, for the PowerCap:
user. The expected t
from the time power is first applied by the user.
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.
a. Maxim recommends that PowerCap Module bases experience one pass through solder reflow
b. Hand soldering and touch-up: Do not touch or apply the soldering iron to leads for more than
Input: 1.5V
Output: 1.5V
oriented with the label side up (“live-bug”).
3 seconds. To solder, apply flux to the pad, heat the lead frame pad and apply solder. To remove
the part, apply flux, heat the lead frame pad until the solder reflow and use a solder wick to
remove solder.
IRQ
/FT and
RST
DR
outputs are open drain.
is defined for DIP modules as a cumulative time in the absence of V
18 of 20
PF
.
CC
is first applied by the
CC
starting