RTC-58321/58323

Page - 2

n Block diagram

n Pin functions

Pin numbers

Pin symbol

Input/output

Function

RTC-58321

RTC-58323

1

5

Input

Chip select. When high, device can be accessed.

2

6

WRITE

Input

Set high to write.

3

7

READ

Input

Set high to read.

4 to 7

8 to 11

Both

Address/data bus.

8

12

GND

Negative power supply.

9

13

ADDRESS

WRITE

Input

10

14

BUSY

Output

1 Hz output pin.

11

15

STOP

Input

1 Hz on/off control pin. When high, the 1 Hz signal is disabled, and

the counter stopped.

12

16

TEST

Input

Increment pin for the counter. Normally this pin should be fixed low.

13

17

Input

Connect to power down detection circuit. (Fix high if there is no

*

1 to 4

NC

Fix low.

14 to 16

18 to 24

Positive power supply (normally +5 V).

* A bypass capacitor (minimum 0.01

µF) must be connected between V

Y10

Y1

Day-of week

1/7

1/10|1/10

Year

1/12

Month

1/10|1/3

Day

or

1/12|1/24

Hours

1/10|1/6

Minutes

1/10|1/6

Seconds

TEST

DATA BUS

ADDRESS

WRITE

CS2

CS1

READ

WRITE

TEST

STOP

1

A

1'

A

BUSY

OSC

32.768 kHz

quarts oscillator

1Hz

1024Hz

BUSY

R

1/2

15

R

MO10

MO1

D10

D1

W

H10

H1

M110

M11

S10

N

D

S1

S1

S10

M11

M110

H1

H10

W

D1

D10

M01

M010

Y1

Y10

D

E-F

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E-F

u Rp = 200K

Ω TYP

TRI-STATE

CONTROL

ADDRESS

LATCH

E, F

SWITCH

1024H

z

1/3600Hz

1/60Hz

1Hz

2

A

3

A