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参数资料
| 型号： | RX-4591CF |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO10 |
| 封装： | SON-10 |
| 文件页数： | 9/19页 |
| 文件大小： | 256K |
| 代理商： | RX-4591CF |
RX - 4591 CF
Page - 14
MQ - 402 - 01
10. 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 (seconds)
* 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) Example of frequency and voltage characteristics
- 3
2
Frequen
cy
fv
×10
6
+ 3
0
3
4
5
Condition :
3 V as reference, Ta=+25
°C
Supply Voltage VDD[V]
(3) Current and voltage consumption characteristics
(3-1) Current consumption when non-accessed (i)
when FOUT=OFF
2
Cur
ren
tc
ons
um
p
tion
[
A]
Supply Voltage VDD[V]
1.0
0.5
3
4
5
Condition :
Ta = +25
°C
CE, FOE = GND
/ IRQ = VDD
FOUT ; Output OFF
(3-2) Current consumption when non-accessed (ii)
when FOUT=32.768 kHz
10
5
2
3
4
5
Cur
ren
tc
ons
um
p
tion
[
A]
Condition :
Ta = +25
°C
CE = GND
FOE, / IRQ = VDD
FOUT ; 32.768 kHz output ON
Supply Voltage VDD[V]
CL=30 pF
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