RTC-72421A Datasheet, PDF (1/1 Pages) Epson Company – Built-in crystal unit allows adjustment-free efficient operation

4-bit REAL TIME CLOCK MODULE
RTC-72421/72423
Product number (please refer to page 2)
Q4272 421xx xxx 00
Q4272 423xx xxx 00
• Built-in crystal unit allows adjustment-free efficient operation.
• 12/24 h clock switchover function and automatic leap year setting.
• Interrupt masking.
Real time clock module
RTC-72421
RTC-72423
Actual size
The details are mentioned in the application manual.
http://www.epsondevice.com
Specifications (characteristics)
Absolute Max. rating
Item
Symbol Condition
Supply voltage
VDD
Ta=+25 °C
Input and output voltage VI/O
Ta=+25 °C
RTC-72421
Storage temperature ∗
TSTG
RTC-72423
∗Stored as bare product after unpacking
Min.
Max. Unit
-0.3
7.0
GND -0.3 VDD+0.3 ^V
-55
+85
-55
+125
°C
Operating range
Item
Symbol
Power voltage
VDD
Supply voltage
VCLK
Operating temperature ∗ TOPR
∗No condensation
Condition
—
—
RTC-72421
RTC-72423
Min. Max. Unit
4.5
5.5 V
2.0
5.5 V
-10
70
-40
85
°C
Frequency characteristics
Item
Frequency tolerance
Frequency temperature
characteristics
Frequency voltage
characteristics
Aging
Symbol
Condition
Range Unit
72421 A
±10
∆f/fo
Ta=+25 °C
VDD=5 V
72421 B
72423 A
±50
±20
72423
-10 °C to +70 °C
(Reference at +25 °C)
TOP
-40 °C to +85 °C
(Reference at +25 °C)
±50
x 10^-6
+10/-120
+10/-220
f/V
Ta=+25 °C
VDD=2.0 V to 5.5 V
±5 Max. x 10^-6/V
fa
VDD=5 V, Ta=+25 °C, first year
±5 Max.
x 10^-6
/year
Terminal connection
RTC-72421
#18
#1
RTC-72423
#24
#1
#10
#9
#13
#12
No. Pin terminal No. Pin terminal
1
STD. P 18
VDD
2
CS0
17
(VDD)
3
ALE
16
(VDD)
4
A0
15
CS1
5
A1
14
D0
6
A2
13
D1
7
A3
12
D2
8
RD
11
D3
9
GND
10
WR
No. Pin terminal No. Pin terminal
1
STD. P 24
VDD
2
CS0
23
(VDD)
3
NC
22
(VDD)
4
ALE
21
NC
5
A0
20
CS1
6
NC
19
D0
7
A1
18
NC
8
NC
17
NC
9
A2
16
D1
10
A3
15
D2
11
RD
14
D3
12
GND
13
WR
(VDD) and VDD are to have the same level of voltage. Do not connect it to any external terminals.
NC is not connected internally.
External dimensions
RTC-72421 (DIP 18-pin)
23.1 Max.
RTC72421 A
EPSON 1234A
(Unit: mm)
7.62
DC characteristics
Item
Current consumption
Symbol
Condition
Min.
Typ. Max.
Unit
Applicable
terminal
IDD1
CS1=0 V _{VDD=5 V}
Exclude input/
—
1
10
µA
—
IDD2 output current VDD=2 V
0.9 5
“H” input voltage (1) _VIH1
—
2.2
“L” input voltage (1) VIL1
—
All inputs
V other than
0.8
CS1
Input leak current (1) ILK1 _{V1=VDD/0 V —}
±1
Input other
µA ^{than D0 to D3}
Input leak current (2) ILK2
— ±10
“L” output voltage (1) VOL1 IOL=2.5 mA
0.4
D0 to D3
“H” output voltage
VOH IOH=-400 µA ^2.4
—V
“L” output voltage (2) VOL2 IOL=2.5 mA
0.4
STD.P
Off leak current
IOFFLK V1=VDD/0 V _—
10 ^µA
Input capacity
Input
C1 _{frequency 1 MHz}
10
20 —
Input other
pF ^{than D0 to D3}
D0 to D3
“H” input voltage (2)
“L” input voltage (2)
VIH2
VIL2
4/5 VDD
VDD=2 to 5.5 V _—
—
1/5 VDD
V
CS1
2.54
0.65 Max.
RTC-72423 (SOP 24-pin)
16.3 Max.
RTC72423 A
EPSON 1234A
0.25
90° to 105°
0.1 Min.
0° to 10°
1.0
1.27
0.35
2.8 Max.
94