Epson RTC72421, RTC72423 Datasheet

77

Real time clock module

Specifications (characteristics)

Absolute Max. rating

Operating range

Frequency characteristics and current consumption
characteristics

DC characteristics

External dimensions

Terminal connection

RTC-72421

(Unit: mm)

23.1 Max.

3.3 Min. 0.2 Min.

6.3

4.2

1182173164155146137128119

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.

1242233224215206197188179161015111412

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

)

(V

DD

)

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°

1.27 0.35

2.54 0.65 Max.

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.

•

12/24 h 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 s
(lead part) (package should
be less than +150 °C)

Twice at under +260 °C within 10
s 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

V

DH

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

I

DD2

Ta=+25 °C

VDD=5 V

72421 A

72421 B

72423 A

72423

Condition

Three drops on a
hard board from 750 mm
or 29400 m/s

2

x 0.3 ms x

1/2 sine wave x 3 directions

CS1=0 V

Exclude input/
output current

VDD=5 V

V

DD=2 V

Specifications

±10

±50

±20

±50

+10/-120

±5 Max.

±10 Max.

10 Max.

5 Max.

Unit

x 10

-6

x 10-6/year

x 10

-6

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

—

V1=VDD/0 V

I

OL=2.5 mA

IOH=-400 µA
IOL=2.5 mA

V1=VDD/0 V

Input

frequency 1 MHz

VDD=2 to 5.5 V

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 °C to +70 °C

(+25 °C reference temperature)

V

DD=5 V, Ta=+25 °C,

first year

Actual size

78

Real time clock module

CS1

VIH

(

CS1

)

VIH

VIH

VIH

VIH

VIH

VIH VIH

VIL

VIL

VIL

VIH

VIL

VIL

VIL

VIH

(

CS1

)

tSU

(

CS1

)

tSU

(

A-ALE

)

tH

(

ALE-A

)

tSU

(

ALE-W

)

tSU

(

D-W

)

tSU

(

W-ALE

)

tSU

(

R-ALE

)

t

W

(

ALE

)

CS0

ALE

WR

A0 to A3

D0 to D3

tH

(

CS1

)

tH

(

W-D

)

tW

(W)

CS1

CS1

CS0 or WR not occurred

CS

1

VIH

(

CS1

)

1/5VDD

VDD

4 V 4 V

V

IH2 VIH2

VIL2 VIL2

tCDR tR

VIH

VIH

V

OH

V

OL

V

OH

V

OL

VIH

VIH VIH

VIL

VIL

VIH
VIL

VIL

VIL

VIL

VIH

(

CS1

)

tSU

(

CS1

)

tSU

(

A-ALE

)

tH

(

ALE-A

)

tSU

(

ALE-R

)

tPZV

(

R-Q

)

tPVZ

(

R-Q

)

tSU

(

R-ALE

)

trnc

(R)

t

W

(

ALE

)

CS0

ALE

RD

A

0 to A3

D0 to D3

tH

(

CS1

)

2 to 4 V

≤

Data storage mode

Interface possible
with external
terminals

Interface possible
with the external
terminals

OSC

DIVIDER

READ • WRITE

CONTROL

ADDRESS LATCH

DATA BUS • BUFFER

ADDRESS DECODER

RD WR CS1 ALE CS0 A0 D0 D1 D2 D3A1 A2 A3

STD•P

64 HZ

REST

STOP

30ADJ

BUSY

HOLD

CARRY PER
SEC.

CARRY PER
MIN.

CARRY PER
HOUR

4

4

4

4

4

IRQFLAG

24/12

Seconds Minutes Hours

Days

Months Years

Week

Sec 1 Sec 10 Min 1 Min 10 Hou 1 Hou 10 Day 1 Day 10 Mon 1 Mon 10 Yea 1 Yea 10 Reg D Reg E Reg F

Register table

Switching characteristics (with ALE

)

Read mode (with ALE

)

Write mode (with ALE

)

Data holding timing

Block diagram

(

V

DD

=

5 V ± 0.5 V

)

0=“L” level,1=“H” level, REST = RESET ITRPT/ STND=INTERRUPT/STANDARD

1) Bit does not exist.

2) Please mask AM/PM bit with 10's of hours operations.

3) Busy is read only. IRQ can only. IRQ can only be set low (“O”).
4

)

5) TEST bit should be “O”.

(

Please connect ALE to V

DD if the microprocessor does not have an ALE output.

)

∗

0
1
2
3
4

5

6
7
8
9
A
B
C

D

E

F

A3

0
0
0
0
0

0

0
0
1
1
1
1
1

1

1

1

A2

0
0
0
0
1

1

1
1
0
0
0
0
1

1

1

1

A1

0
0
1
1
0

0

1
1
0
0
1
1
0

0

1

1

A0

0
1
0
1
0

1

0
1
0
1
0
1
0

1

0

1

S

1

S10
MI 1
MI10

H 1

H10

D1

D10
MO

1

MO

10

Y1

Y10

W

Reg

D

Reg

E

Reg

F

D

3

s

8

∗

mi

8

∗

h

8

∗

d

8

∗

mo

8

∗

y

8

y80

∗

30 sec.

ADJ

t1

TEST

D

2

s

4

s40

mi4

mi

40

h4

PM/AM

d4

∗

mo

4

∗

y

4

y40
w4

IRQ

FLAG

t

0

24/12

D

1

s2
s20

mi2

mi20

h2

h20

d2

d20

mo2

∗

y

2

y20
w2

BUSY

ITRPT
/STND

STOP

D0

s1
s10

mi1

mi10

h1

h10

d1

d10

mo1

mo10

y1
y10
w1

HOLD

MASK

REST

Count

Value

0 to 9
0 to 5
0 to 9
0 to 5
0 to 9

0 to 2

or

0 to 1

0 to 9
0 to 3
0 to 9
0 to 1

0 to 9

0 to 6

-----

Remarks

1- second digit register
10- second digit register
1- minute digit register
10- minute digit register
1- hour digit register

PM/AM,10- hours digit register

1- day digit register
10 -day digit register

1- month digit register
10- month digit register
1- year digit register
10- year digit register
Week register

Control Register D

Control Register E

Control Register F

Item

CS

1 setup time

Address setup time before ALE
Address hold time after ALE
ALE pulse width
ALE setup time before WRITE
ALE setup time before READ
ALE setup time after WRITE
ALE setup time after READ
WRITE pulse width
DATA delay time after READ
DATA Hold time after READ
DATA setup time before WRITE
DATA hold time after WRITE
CS

1 hold time

READ/WRITE recovery time

Symbol

t

SU (CS1)

t

SU (A-ALE)

t

H (ALE-A)

t

W (ALE)

t

SU (ALE-W)

t

SU (ALE-R)

t

SU (W-ALE)

t

SU (R-ALE)

t

W (W)

t

PZV (R-Q)

t

PVZ (R-Q)

t

SU (D-W)

t

H (W-D)

t

H (CS1)

t

REC (R/W)

Condition

CL=150 pF

Min.

1000

50
50
80

0

0
50
50

120

---­0

80
10

1000

200

Max.

----

120

70

----

Unit

ns

Address

Register

Data Bit

1
0

PM/AM

PM
AM

ITRPT/STND

ITRPT

STND

24/12

24
12

Data