Datasheet > 0RTC72423B

0RTC72423B

更新时间： 2022-01-19 07:32:00

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
2页	110K
描述
IC SMD

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数据手册

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0RTC72423B 数据手册

Real Time Clock Modules - Seiko Epson

RTC-72421/72423

Features

• Built-in quartz crystal makes regulation unnecessary

and allows for easy design

• ALE INPUT terminal available for 8048, 8051 and

8085 series

• Incorporates built-in time counters (year, month,

week, day)

• 12hr/24hr clock switchcover function and automatic

leap year setting

• 30 seconds error adjustment function

• READ, WRITE, HOLD, STOP, RESET and CHIP SELECT

inputs

• The CMOS IC boasts low current consumption &

features a backup function

• 18 pin dual-in-line package

Absolute Max. Rating

Item

Symbol Condition

Specification

Unit

• Pin and function are compatible with the SMC 5242C

Supply voltage

Input and Output voltage

Storage temp.

V_DD

V_I/O

T_STG

Ta=25°C

RTC-72421

RTC-72423

-0.3 ~ +7.0

GND -0.3 ~ V_DD+0.3

-55 ~+85

°C

Terminal Connection

-55 ~ +125

Under 260°C within 10S (lead part)

(package should be less than 150°C)

RTC-72421

RTC-72423

Soldering condition

T_SOL

Under 260°C within 10S x 2

time under 230°C withhin 3 min

Operating Voltage

Item

Symbol Condition

Specification

Unit

Operating voltage

V_DD

T_OPR

V_DH

t_CDR

t_R

4.5 ~ 5.5

-40 ~ +85

2.0 ~ 5.5

2.0 min.

°C

Operating temperature

Data holding voltage

CSI data holding time

Operating restoring time

µS

Refer to the data

holding timing

Frequency and Current Consumption Characteristics

Item

Symbol

Condition

Specification Unit

72421A

±10

Ta=25°C

V_DD=5V

72421B

72423A

7243B

±50

ppm

±20

±50

Frequency tolerance

∆f/fo

Frequency temperature

characteristics

-10 ~ +70°C,

(25°C reference

±10/-120

ppm

Dimensions (mm)

temperature)

Aging

Shock resistance

S.R.

V_DD=5V, Ta25°C, 1st year

±5 max.

ppm

Drop test of 3 times on a hard

board from 75cmheight of

300G x 0.3mS x 1/2 sine wave

x 3 directions

Current consumption

I_DD

CSI≥ov V_DD=5V

10 max.

5 Max.

µA

V_DD=2V

Electrical Characteristics

Item

Symbol Condition Min Typ.

Max. Unit Applicable terminal

“H” Input Voltage (1)

“L” Input Voltage (1)

Input leakage current (1)

V_IH1

V_IHL

I_IK1

2.2

All inputs

0.8

1/-1

other than CSI

µA

Input other than

D₂~ D₃

V =V_DD/0V

Input leakage current (2)

“L” output voltage (1)

“H” output voltage

“L” output voltage (2)

OFF leak current

I_LK2

V_OL1

V_OH

V_OL2

I_OFFLK

C₁

10/-10

D₀~ D₃

I_OL=2.5mA

I_OH=-400µA

I_OL=2.5mA

2.4

0.4

STD.P

CSI₁

V₁=V /0V

µA

Input capacity

Input Frequency

1MHz

“H” Input Voltage (2)

“L” Input Voltage (2)

V_IH2

V_DD=2~5.5V 4/5V_DD

1/5V_DD

TEL: +44 1635 528520 FAX: +44 1635 528443

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