DS1318 データシートの表示（PDF） - Maxim Integrated

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DS1318

Parallel-Interface Elapsed Time Counter

Maxim Integrated 

19-5664; Rev 1; 12/10

Parallel-Interface Elapsed Time Counter

General Description

The DS1318 parallel-interface elapsed time counter

(ETC) is a 44-bit counter that maintains the amount of

time that the device operates from main and/or backup

power or during an external event. The internal

frequency of the counter clock is 4.096kHz, which pro-

vides a 244µs resolution and a maximum count of over

136 years. A built-in power-sense circuit detects power

failures, automatically switches to the backup supply,

and controls the timer. If an external event timer is

desired, the control input EXT can control the counter

operation. An open-drain output provides an interrupt,

and a square-wave output provides a programmable

square wave. The DS1318 is accessed through a byte-

wide parallel interface, and operates over the industrial

temperature range.

Power Meters

Industrial Controls

Servers

Applications

Typical Operating Circuit

VCC

RPU

VCC

SQW

IRQ

WE

EXT

OE

CPU

CE

DS1318

VBAT

A3–A0

X1

DQ–DQ7

GND

X2

0.1μF

EXTERNAL

COUNTER

ENABLE

(EVENT TIMER)

Features

♦ Byte-Wide Parallel Interface

♦ 44-Bit Binary Counter Provides Timer with 244µs

Resolution

♦ Automatic Power-Fail Detect and Switch Circuitry

Selects Power Source from the Primary Power

and the Battery, and Write Protects the Internal

Registers

♦ Internal Power-Fail Circuit Allows Timer to

Provide Primary or Battery Operation Times

♦ Timer can Alternately Provide an Event Timer of

Either an Active-High or Active-Low Pulse

♦ Interrupt Output Generated Periodically or When

the Upper 32 Bits of the Counter Match an Alarm

Register

♦ Square-Wave Output with 16 Selectable

Frequencies from 32.768kHz to 0.5Hz

♦ +3.3V Operation

♦ Industrial Temperature Range: -40°C to +85°C

♦ Underwriters Laboratories (UL) Recognized

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

DS1318E+

-40°C to +85°C 24 TSSOP

DS1318E+T&R

-40°C to +85°C 24 TSSOP

+Denotes a lead(Pb)-free/RoHS-compliant package.

T&R = Tape and reel.

Pin Configuration

TOP VIEW

X1

1+

X2

2

GND

3

EXT

4

A3

5

A2

6

A1

7

A0

8

DQ0

9

DQ1

10

DQ2

11

GND

12

DS1318

TSSOP

(4.4mm)

24

VCC

23

VBAT

22

IRQ

21

SQW

20

WE

19

OE

18

CE

17

DQ7

16

DQ6

15

DQ5

14

DQ4

13

DQ3

______________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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