VT82885 datasheet(1/16 Pages) ETC

номер детали	VT82885

подробное описание детали	Real Time Clock

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VT82885

Real Time Clock

VIA Technologies, Inc.

FEATURES

• Drop-in replacement for IBM AT computer

clock/calendar.

• Pin configuration closely matches the

DS12887, DS12885and DS12885Q

• Counts seconds, minutes, hours, days,

day of the week, date, month, and year

with leap year compensation

• Binary or BCD representation of time,

calendar and alarm

• 12- or 24-hour clock with AM and PM in

12-hour mode

• Daylight Savings Time option

• Intel bus timing

• Multiplex bus for pin efficiency

• Interfaced with software as 128 RAM

locations

- 14 bytes of clock and control registers

- 114 bytes of general purpose RAM

• Programmable square wave output signal

• Bus-compatible interrupt signals (IRQ#)

• Three interrpts are separately software-

maskable and testable

- Times-of-day alarm once/second to

once/day

- Periodic rates from 122

µs to 500 ms

- End of clock update cycle

• Optional 28-pin PLCC surface mount

package

DESCRIPTION

The VT82885 Real Time Clock is designed

to be a direct replacement for the DS12885.

The VT82885 is identical in form, fit and

function to the DS12885. It has 114 bytes of

general purpose RAM. Access to this RAM

space is determined by the logic level

presented on AD6 during the address

portion of an access cycle. An external

crystal and battery are the only components

required to maintain time-of-day and

memory status in the absence of power. A

complete description of operating conditions,

electrical characteristics, bus timing and pin

descriptions follows.

PIN ASSIGNMENT

1

2

GND

3

4

5

X1

X2

AD0

AD1

24

VCC

23

22

21

20

19

18

17

SQW

NC

RCLR#

VBAT

IRQ#

RESET#

RD#

6

7

8

AD2

AD3

AD4

AD5

AD6

AD7

GND

9

10

11

12

16

15

14

13

NC

WR#

AS

CS#

VT82885 24 PIN DIP

AD0

AD1

AD2

AD3

AD4

AD5

NC

RCLR#

VBAT

IRQ#

RESET#

RD#

GND

WR#

X

2

X

1

G

N

D

N

C

V

CC

S

Q

W

N

C

A

D

6

N

C

A

D

7

G

N

D

C

S

#

A

S

N

C

1

2

7

6

3

9

8

10

13 14 15 16 17

20

21

22

23

24

27

28

25

11

19

18

4

26

5

VT82885 28-PIN PLCC

PIN DESCRIPTION

AD0-AD7

- Multiplexed Address/Data Bus

NC

- No Connection

CS#

- Chip Select

AS

- Address Strobe

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