DS1689S-TRL Maxim Integrated Products, DS1689S-TRL Datasheet - Page 12

• Manufacturer Part Number: DS1689S-TRL
• Description: IC RTC SER W/NV RAM CTRL 28-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/Serializedr

Specifications of DS1689S-TRL

• Memory Size: 114B
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.3 V, 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 2. Periodic Interrupt Rate and Square-Wave Output Frequency
Note: RS3–RS0 determine periodic interrupt rates as listed for E32K = 0.
The third method uses a periodic interrupt to determine if an update cycle is in progress. The UIP bit in
Register A is set high between the setting of the PF bit in Register C (see Figure 3). Periodic interrupts
that occur at a rate of greater than t
occurrence of the periodic interrupt. The reads should be complete within (t
data is not read during the update cycle.
Figure 3. Update-Ended and Periodic Interrupt Relationship
EXT. REG. B
E32K
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
RS3
SELECT BITS REGISTER A
X
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
RS2
X
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
BUC
RS1
X
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
allow valid time and date information to be reached at each
RS0
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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INTERRUPT RATE
None
3.90625ms
7.8125ms
122.070µs
244.141µs
488.281µs
976.5625µs
1.953125ms
3.90625ms
7.8125ms
15.625ms
31.25ms
62.5ms
125ms
250ms
500ms
(See Note)
t
PI
PERIODIC
PI
/ 2 + t
None
256Hz
128Hz
8.192kHz
4.096kHz
2.048kHz
1.024kHz
512Hz
256Hz
128Hz
64Hz
32Hz
16Hz
8Hz
4Hz
2Hz
32.768kHz
SQW OUTPUT
FREQUENCY
BUC
) to ensure that