RTC-72421 datasheet(1/2 Pages) EPSON

Part #	RTC-72421

Description	REAL TIME CLOCK MODULE (4-bit)

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Manufacturer	EPSON [Epson Company]

Direct Link	http://www.epsondevice.com

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Actual size

Real time clock module

Block diagram

Terminal connection/External dimensions

(Unit:mm)

Specifications (characteristics)

*Refer to application manual for details.

Absolute Max. rating

DC characteristics

Item

Symbol

Conditions

Min.

Max.

Unit

Item

Symbol

Conditions

Min.

Typ.

Max.

Unit

Applicable terminal

Supply voltage

VDD

Ta=+25

C

-0.3

+7.0

V

Current consumption

IDD1

CS1= 0 V

Exclude input/

output current

VDD=5 V

-

1

10

A

-

Input voltage

VI/O

Ta=+25

C

GND-0.3

VDD+0.3

IDD2

VDD=2 V

0.9

5

-

Storage

temperature *

TSTG

RTC-72421

-55

+85

C

HIGH input voltage (1)

VIH1

-

2.2

-

V

All inputs other than

CS1

RTC-72423

-55

+125

LOW input voltage (1)

VIL1

-

0.8

*Stored as bare product after unpacking

LOW output voltage (1)

VOL1

IOL=2.5 mA

-

0.4

V

D0 to D3

Operating range

HIGH output voltage

VOH

IOH=-400 µA

2.4

-

Item

Symbol

Conditions

Min.

Max.

Unit

LOW output voltage (2)

VOL2

IOL=2.5 mA

-

0.4

STD.P

Power voltage

VDD

-

4.5

5.5

V

OFF leak current

IOFFLK

V1=VDD/0 V

10/-10

A

Clock voltage

VCLK

-

2.0

5.5

Input capacity

C1

Input frequency

1 MHz

10

-

pF

Input other than

D0 to D3

Operating

temperature

TOPR

RTC-72421

-10

+70

C

20

D0 to D3, STD.P

RTC-72423

-40

+85

HIGH input voltage (2)

VIH2

VDD=2.0 V to 5.5 V

4/5 VDD

-

V

CS1

Stored as bare produc after unpacking

LOW input voltage (2)

VIL2

-

1/5 VDD

Frequency characteristics

Input leak current (1)

ILK1

V1=VDD/0 V

-

1/-1

A

Input other than

D0 to D3

Item

Symbol

Conditions

Range

Unit

Input leak current (2)

ILK2

10/-10

D0 to D3

Frequency

precision

f /f

Ta=+25 °C

VDD=5.0 V

72421A

10

10-6

72421B

50

72423A

20

72423B

50

Frequency

temperature

characteristics

TOP

-10

C to +70 C (+25 C)

+10 / -120

-40

C to +85 C(+25 C)

+10 / -220

Frequency voltage

characteristics

f/V

Ta=+25

C,VDD=2.0 V to 5.5 V 5.0 Max. 10-6/V

Aging

fa

Ta=+25

C,VDD=5.0 V,First year 5.0 Max. 10-6/year

OS C

R ESET

bit

STOP

bit

30 sec A D J

bit

C ounter

HO LD

bit

BU SY

bit

D3

D2

D1

D0

WR

RD

A3

A2

A1

A0

CS 0

ALE

CS 1

S 1

S 10

M I1

M I10

H1

H10

W

D1

D10

M O1 M O 10

Y1

Y10

64 H z

1 S ec ond c arry

1 M inute c arry

1 H our c arry

S 1 to

CF

CD

CE

CF

Gate

Latc h

Decoder

24/12

bit

R T C -72421/72423

STD .P

O utput

Selec tor

RTC-72421

RTC-72423

REAL TIME CLOCK MODULE (4-bit)

RTC - 72421

RTC - 72423

Built-in crystal unit allows adjustment-free efficient operation.

24 h /12 h changeable and leap year automatically adjustable

(Gregorian calendar).

The metal cas e inside of the molding c ompound m ay be exposed on the top or bottom of this product.

This purely cos metic and does not have any eff ect on quality, reliability or electric al specs.

RTC-72421 (DIP 18-pin)

7.62

0

 -15

0.25

0.46

4.2

Max.

3.3

Min.

0.2

Min.

2.54

1.52

23.1 Max.

#1

#18

#10

#9

RTC72421 A

EPSON

1234A

No.

terminal

No.

terminal

1

STD.P

18

VDD

2

/CS0

17

(VDD)

3

ALE

16

(VDD)

4

A0

15

CS1

5

A1

14

C0

6

A2

13

D1

7

A3

12

D2

8

/RD

11

D3

9

GND

10

/W R

RTC-72423 (SOP 24-pin)

1.0

0.2

0

 - 10

0.2

0

 - 10

1.27

0.35

2.8 Max.

0.1 M in.

2.8 Max.

0.1 M in.

#12

#1

16.3 Max.

#24

#13

RTC62423

EPSON 1234A

#12

#1

16.3 Max.

#24

#13

RTC72423

EPSON 1234A

No.

terminal

No.

terminal

1

STD.P

24

VDD

2

/CS0

23

(VDD)

3

N.C.

22

(VDD)

4

ALE

21

N.C.

5

A0

20

CS1

6

N.C.

19

D0

7

A1

18

N.C.

8

N.C.

17

N.C.

9

A2

16

D1

10

A3

15

D2

11

/RD

14

D3

12

GND

13

/W R

Product Number (Please contact us)

RTC-72421 : Q42724212xxxx00

RTC-72423 : Q42724232xxxx00

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