Reference Data; Frequency Temperature Characteristics (Typical); Frequency Voltage Characteristics (Typical); Current Consumption Voltage Characteristics (Typical) - Epson RTC-72421 Applications Manual

Reference data

1. Connection to multiplexed bus type
(typical)
α = -0.035ppm/˚C
2. Frequency voltage characteristics
(typical)
Note: This data shows average values for a sample lot.
For rated values, see the specifications on page 4.
θ
= 25˚C Typ.
T
2
Typ.
Finding the frequency stability (clock error)
1. The frequency-temperature characteristics can be
approximated by the following equation:
∆f
(ppm)=α(θ
T
2. To determine the overall clock accuracy, add the
frequency tolerance and the voltage characteristics:
∆f/f(ppm)=∆f/f
3. Finding the daily deviation:
Daily error =
The clock error is one second per day at 11.574 ppm.
3. Current consumption voltage
characteristics (typical)
Page-21
) 2
-θ
T X
+ ∆f + ∆f
0 T V
∆
-6
f/f x 10 x 86400