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参数资料
| 型号： | RTC-72421A |
| 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, PDIP18 |
| 封装： | DIP-18 |
| 文件页数： | 17/26页 |
| 文件大小： | 192K |
| 代理商： | RTC-72421A |
RTC - 72421 / 72423
Page - 20
MQ162-04
! 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 ( Typ. )
Frequency[x10
-6]
-4
-2
0
+2
+4
6
2
3
4
5
Supply Voltage(VDD) [V]
Condtions
5 V reference,Ta=+25
°C
3. Current consumption voltage characteristics ( Typ. )
Current consumption[
A]
1
2
3
4
5
6
2345
Supply voltage(VDD)
Conditions
CS1=0 V, No load, Ta=+25
°C
Note:
This data shows average values for a sample lot.
For rated values, see the specifications.
相关PDF资料 |
PDF描述 |
|---|---|
| RTC-72421B | 0 TIMER(S), REAL TIME CLOCK, PDIP18 |
| RTC-72423A-0 | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| RTC-72423B-0 | REAL TIME CLOCK, PDSO24 |
| RTC-72423A-0 | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| RTC-72423B-0 | REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| RTC72421AROHS | 制造商:Epson Electronics America Inc 功能描述:Real Time Clock Parallel 18-Pin PDIP |
| RTC72421B | 制造商:Epson Toyocom Corporation 功能描述:IC RTC 72421 DIP18 制造商:Epson Toyocom Corporation 功能描述:IC, RTC, 72421, DIP18 制造商:Epson Toyocom Corporation 功能描述:IC, RTC; Clock Format:12Hr / 24Hr; Clock IC Type:RTC; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Digital IC Case Style:DIP; No. of Pins:18; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:18-DIP;RoHS Compliant: Yes |
| RTC-72421B | 功能描述:IC REAL TIME CLOCK 18-DIP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| RTC-72421B PURE SN | 制造商:Epson Electronics America Inc 功能描述:REAL TIME CLOCK MODULE 4-BIT |
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