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参数资料
| 型号： | RTC-62423B-0 |
| 厂商： | EPSON TOYOCOM CORP |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO24 |
| 封装： | SOP-24 |
| 文件页数： | 15/24页 |
| 文件大小： | 195K |
| 代理商： | RTC-62423B-0 |
RTC - 62421 / 62423
Page - 19
MQ152-05
! Reference data
[Finding the frequency stability]
1. Frequency and temperature characteristics can be approximated
using the following equations.
fT = α ( θT - θX )2
fT
: Frequency deviation in any
temperature
α
( 1 / °C
2 )
: Coefficient of secondary temperature
(
0.035±0.005 ) × 10-6 / °C2
θT
(
°C )
: Ultimate temperature (+25
±5 °C)
θX( °C )
: Any temperature
2. To determine overall clock accuracy, add the frequency precision
and voltage characteristics.
f/f = f/fo + fT + fV
f/f
: Clock accuracy (stable frequency) in
any temperature and voltage.
f/fo
: Frequency precision
fT
: Frequency deviation in any
temperature.
fV
: Frequency deviation in any voltage.
3. How to find the date difference
Date Difference =
f/f × 86400(s)
* For example:
f/f = 11.574 × 10-6 is an error of
approximately 1 second/day.
(1) Example of frequency and temperature characteristics
-150
-100
-50
0
-50
0
+50
+100
Temperature [
°C]
F
re
que
nc
y
fT
× 10-6
θT = +25 °C Typ.
α = -0.035 × 10-6 Typ.
(2) Frequency voltage characteristics (typical)
-10
-5
0
+5
+10
6
23
45
Supply voltage
-15
Frequency [x10
-6]
Conditions:
5 V standard, Ta = +25
°C
(VDD) [V]
(3) Current consumption voltage characteristics (typical)
A
[]
5
10
15
20
25
6
23
4
5
Current consumption
Conditions:
CS1 = 0 V, no load, Ta = +25
°C
Supply voltage (VDD) (V)
Note:
This data shows average values for a sample lot.
For rated values, see the specifications on page 4.
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