DS1284Q Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS1284Q

Watchdog Timekeepers

Dallas Semiconductor -> Maxim Integrated 

DS1284/DS1286

DIP

PIN

EDIP PLCC

NAME

FUNCTION

Primary Power-Supply Input. When voltage is applied within

normal limits, the device is fully accessible and data can be

28

28

28

VCC

written and read. When a backup supply is connected to the

device and VCC is below VTP, read and writes are inhibited.

However, the timekeeping function continues unaffected by the

lower input voltage.

Figure 1. Block Diagram

X1

Oscillator

÷8

X2

DS1286

only

÷ 40.96

÷ 40.96

PF delay

÷ 10

VCC

Power

Switch

V BAT

GND

÷4

DS1286 only

1024Hz

SQW

A0-A5

CE

OE

WE

Internal Registers

External Registers,

clock, calendar,

time of day alarm

Command

Register

Update seconds through

years and check time of

day alarm

TD INT

WD INT

Swap

pins

N

V CC

100Hz

IBH

P

User RAM

100Hz

50 Bytes

Internal Counters

Internal Registers

External

External

Registers

Registers

N

Watchdog Alarm

Hundredths of

Internal Counters

Seconds

Data I/O Buffers

DS1284/DS1286

DQ0–DQ7

INTA

INTB/

(INTB)

4 of 18

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