參數(shù)資料
型號(hào)： 0RTC72423B
英文描述： IC SMD
中文描述： 集成電路貼片
文件頁(yè)數(shù)： 1/2頁(yè)
文件大小： 107K
代理商： 0RTC72423B
TEL: +44 1635 528520
FAX: +44 1635 528443
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
Pin and function are compatible with the SMC 5242C
Real Time Clock Modules - Seiko Epson
Terminal Connection
Dimensions (mm)
Absolute Max. Rating
Item
Symbol
Condition
Specification
Unit
Supply voltage
VDD
Ta=25°C
-0.3 ~ +7.0
V
Input and Output voltage
VI/O
Ta=25°C
GND -0.3 ~ VDD +0.3
V
Storage temp.
TSTG
RTC-72421
-55 ~+85
°C
RTC-72423
-55 ~ +125
RTC-72421
Under 260°C within 10S (lead part)
(package should be less than 150°C)
Soldering condition
TSOL
RTC-72423
Under 260°C within 10S x 2
time under 230°C withhin 3 min
Operating Voltage
Item
Symbol
Condition
Specification
Unit
Operating voltage
VDD
-
4.5 ~ 5.5
V
Operating temperature
TOPR
-
-40 ~ +85
°C
Data holding voltage
VDH
-
2.0 ~ 5.5
V
CSI data holding time
tCDR
Refer to the data
2.0 min.
S
Operating restoring time
tR
holding timing
Frequency and Current Consumption Characteristics
Item
Symbol
Condition
Specification
Unit
72421A
±10
Ta=25°C
72421B
±50
Frequency tolerance
f/fo
V
DD=5V
72423A
±20
ppm
7243B
±50
Frequency temperature
-10 ~ +70°C,
±10/-120
ppm
characteristics
(25°C reference
temperature)
Aging
fa
V
DD=5V, Ta25°C, 1st year
±5 max.
ppm
Shock resistance
S.R.
Drop test of 3 times on a hard
±5 max.
ppm
board from 75cmheight of
300G x 0.3mS x 1/2 sine wave
x 3 directions
Current consumption
IDD1
CSI
≥ov V
DD
=5V
10 max.
A
IDD2VDD=2V
5 Max.
A
Electrical Characteristics
Item
Symbol Condition
Min
Typ.
Max.
Unit Applicable terminal
“H” Input Voltage (1)
V
IH1
-
2.2
-
V
All inputs
“L” Input Voltage (1)
V
IHL
-
0.8
other than CSI
Input leakage current (1)
I
IK1
-
1/-1
A
Input other than
D
2 ~ D3
Input leakage current (2)
I
LK2
V1=V
DD/0V
-
10/-10
D
0 ~ D3
“L” output voltage (1)
V
OL1
I
OL=2.5mA
-
0.4
V
D
0 ~ D3
“H” output voltage
V
OH
I
OH=-400A
2.4
-
“L” output voltage (2)
V
OL2
I
OL=2.5mA
-
0.4
V
STD.P
OFF leak current
I
OFFLK
V
1=VDD/0V
-
10
A
Input capacity
C
1
Input Frequency
-5
-
pF
1MHz
“H” Input Voltage (2)
V
IH2
V
DD=2~5.5V
4/5V
DD
-
V
CSI
1
“L” Input Voltage (2)
V
IH2
-
1/5V
DD
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