Datasheet

69
Real time clock module
Specifications (characteristics)
Absolute Max. rating
Operating range
Frequency characteristics and current consumption
characteristics
Electrical characteristics
External dimensions
Terminal connection
RTC-72421
(Unit: mm)
23.1 max.
3.3 min. 0.2 min.
6.8 max.
4.2
1
18
2
17
3
16
4
15
5
14
6
13
7
12
8
11
9
10
RTC72421 A
EPSON 5053C
RTC72423 A
EPSON 6150
(VDD) and VDD are to have the same level of voltage. Do not connect it to any external terminals.
NC is not connected internally.
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
RTC-72421
RTC-72423
RTC-72423
0.05 min.
2.8 max.
7.62
0.25
2.5
16.3 max.
7.9
12.2 max.
0.2
1.0
0.3
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
STD. P
CS
0
ALE
A
0
A 1
A 2
A 3
RD
GND
WR
D
3
D2
D1
D0
CS1
(
VDD
)
(
VDD
)
VDD
72423
STD. P
CS
0
NC
ALE
A
0
NC
A
1
NC
A
2
A3
RD
GND
WR
D
3
D2
D1
NC
NC
D
0
CS1
NC
(
V
DD
)
(
V
DD
)
V
DD
72421
90° to
105°
0° to
10°
4-bit REAL TIME CLOCK MODULE
RTC-72421/72423
• Built-in crystal unit allows adjustment-free efficient operation.
• ALE input terminal available for 8048, 8051, and 8085 series.
• 12/24H clock switchover function and automatic leap year setting.
• Interrupt masking.
• 30 second adjustment function.
• Low current consumption and features a backup function.
Item
Power source voltage
Input and output voltage
Storage temperature
Soldering condition
Symbol
V
DD
VI/O
TSTG
TSOL
Condition
Ta=25˚C
Ta=25˚C
RTC-72421
RTC-72423
RTC-72421
RTC-72423
Specifications
-0.3 to 7.0
GND -0.3 to V
DD+0.3
-55 to +85
-55 to +125
Under 260˚C within 10 sec.
(lead part) (package should
be less than 150˚C)
Twice at under 260˚C within
10 sec. or under 230˚C
within 3 min.
Unit
V
˚C
Item
Operating voltage
Operating temperature
Data holding voltage
CSI data holding time
Operation restoring time
Symbol
V
DD
TOPR
VDH
tCDR
tR
Condition
RTC-72421
RTC-72423
Refer to the data
holding timing
Specifications
4.5 to 5.5
-10 to 70
-40 to 85
2.0 to 5.5
2.0 min.
Unit
V
˚C
V
µs
Item
Frequency tolerance
Frequency temperature
characteristics
Aging
Shock resistance
Current consumption
Symbol
∆f/fo
fa
S.R.
I
DD1
IDD2
Ta=25˚C
V
DD=5V
72421 A
72421 B
72423 A
72423
Condition
Three drops on a
hard board from 75 cm
or 3000G x 0.3ms x
1/2 sine wave x 3 directions
CS1=0V
Exclude input/
output current
VDD=5V
V
DD=2V
Specifications
±10
±50
±20
±50
+10/-120
±5 max.
±10 max.
10 max.
5 max.
Unit
ppm
ppm/y
ppm
µA
Item
“H” input voltage (1)
“L” input voltage (1)
Input leak current (1)
Input leak current (2)
“L” output voltage (1)
“H” output voltage
“L” output voltage (2)
Off leak current
Input capacity
“H” input voltage (2)
“L” input voltage (2)
Symbol
V
IH1
VIL1
ILK1
ILK2
VOL1
VOH
VOL2
IOFFLK
C1
VIH2
VIL2
Condition
—
V
1=VDD/0V
I
OL=2.5mA
I
OH= -400µA
IOL=2.5mA
V
1=VDD/0V
Input
frequency 1 MHz
VDD=2 to 5.5V
Min.
2.2
—
2.4
—
4/5 VDD
—
Typ.
—
10
20
—
Max.
—
0.8
±1
±10
0.4
—
0.4
10
—
1/5 VDD
Unit
V
µA
V
µA
pF
V
Applicable
terminal
All inputs
other than
CS
1
Input other
than D
0 to D3
D0 to D3
STD.P
Input other
than D
0 to D3
D0 to D3
CS1
-10 to +70˚C
(25˚C reference temperature)
VDD=5V, Ta=25˚C,
first year
Actual size