DS1284 Maxim Integrated Products, DS1284 Datasheet - Page 14

• Manufacturer Part Number: DS1284
• Description: IC TIMEKEEPER WATCHDOG 28-DIP
• Manufacturer: Maxim Integrated Products
• Type: Watchdog Timerr

Specifications of DS1284

• Memory Size: 50B
• Time Format: HH:MM:SS:hh (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

NOTES:
1. WE is high for a read cycle.
2. OE = V
3. t
4. t
5. t
6. If the CE low transition occurs simultaneously with or later than the WE low transition in write cycle
7. If the CE high transition occurs prior to or simultaneously with the WE high transition, the output
8. If WE is low or the WE low transition occurs prior to or simultaneously with the CE low transition,
9. Each DS1284/DS1286 is marked with a four-digit date code AABB. AA designates the year of
10. All voltages are referenced to ground.
11. Applies to both interrupt pins when the alarms are set to pulse.
12. Interrupt output occurs within 100ns on the alarm condition existing.
13.
AC TEST CONDITIONS
Output Load: 100pF + 1TTL Gate
Input Pulse Levels: 0 to 3.0V
Timing Measurement Reference Levels
Input Pulse Rise and Fall Times: 5ns
PACKAGE INFORMATION
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
low to the earlier of CE or WE going high.
1, the output buffers remain in a high-impedance state during this period.
buffers remain in a high-impedance state during this period.
the output buffers remain in a high-impedance state during this period.
manufacture. BB designates the week of manufacture. The expected t
date of manufacture.
RTC modules can be successfully processed through conventional wave-soldering techniques as long
as temperature exposure to the lithium energy source contained within does not exceed +85°C.
However, post-solder cleaning with water-washing techniques is acceptable, provided that ultrasonic
vibrations are not used to prevent crystal damage.
WP
DS
DH
28 PLCC
28 PDIP
28 EDIP
or t
is measured from WE going high. If CE is used to terminate the write cycle, then t
Input: 1.5V
Output: 1.5V
is specified as the logical AND of CE and WE. t
DH
IH
are measured from the earlier of CE or WE going high.
or V
IL
. If OE = V
PACKAGE CODE
MDP28+1
Q28+11
P28+9
IH
during write cycle, the output buffers remain in a high-impedance state.
DOCUMENT NO.
21-0044
21-0049
21-0241
14 of 18
WP
is measured from the latter of CE or WE going
DR
is defined as starting at the
DH
DS1284/DS1286
= 20ns.