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DS1688/DS1691

3 Volt/5 Volt Serialized Real Time Clock

with NV RAM Control

FEATURES

Incorporates industry standard DS1287 PC clock plus

enhanced features:

PIN ASSIGNMENT

V

BAUX

X1

X2

RCLR

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

PWR

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

CEI

CEO

V

CCI

V

CCO

SQW

V

BAT

IRQ

PSEL

RD

GND

WR

ALE

CS

KS

V

BAUX

X1

X2

RCLR

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

PWR

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

CEI

CEO

V

CCI

V

CCO

SQW

V

BAT

IRQ

PSEL

RD

GND

WR

ALE

CS

KS

鈥?/div>

+3

or +5 volt operation

鈥?/div>

64鈥揵it Silicon serial number

鈥?/div>

64鈥揵it

customer specific ROM or additional serial

number available

control circuitry supports system power on

from date/time alarm or key closure

battery backup and write protection to

external SRAM

12.5 pF crystal

鈥?/div>

Power

鈥?/div>

Automatic

鈥?/div>

Crystal select bit allows RTC to operate with 6 pF or

鈥?/div>

114 bytes user NVRAM

鈥?/div>

Auxiliary battery input

鈥?/div>

RAM clear input

鈥?/div>

Century register

鈥?/div>

32 KHz output for power management

鈥?/div>

32鈥揵it V

CC

powered elapsed time counter

鈥?/div>

32鈥揵it V

BAT

powered elapsed time counter

鈥?/div>

16鈥揵it power cycle counter

鈥?/div>

Compatible with

functions

existing BIOS for original DS1287

DS1688 28鈥揚(yáng)IN DIP

(600 MIL)

V

BAUX

NC

RCLR

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

PWR

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

DS1688S 28鈥揚(yáng)IN SOIC

(330 MIL)

CEI

CEO

V

CCI

V

CCO

SQW

NC

IRQ

PSEL

RD

NC

WR

ALE

CS

KS

DS1691 28鈥揚(yáng)IN ENCAPSU-

LATED PACKAGE (740 MIL)

鈥?/div>

Available as chip (DS1688) or stand鈥揳lone module

with embedded battery and crystal (DS1691)

PIN DESCRIPTION

X1

X2

RCLR

AD0-AD7

PWR

KS

CS

ALE

WR

RD

V

CCO

鈥?/div>

Crystal Input

Crystal Output

RAM Clear Input

Mux鈥檈d Address/Data Bus

Power鈥搊n Interrupt Output

Kickstart Input

RTC Chip Select Input

RTC Address Strobe

RTC Write Data Strobe

RTC Read Data Strobe

RAM Power Supply Output

鈥?/div>

Timekeeping algorithm includes leap year compensa-

tion valid up to 2100

ORDERING INFORMATION

PART #

DS1688

DS1688S

DS1691

DESCRIPTION

RTC Chip, 28鈥損in DIP

RTC Chip, 28鈥損in SOIC

RTC Module; 28鈥損in DIP

030598 1/5

標(biāo)準(zhǔn)包裝
13
類別
集成電路 (IC)
家庭
時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘
系列
-
類型
時(shí)鐘/日歷
特點(diǎn)
警報(bào)器，閏年，方波輸出，唯一 ID
存儲(chǔ)容量
114B
時(shí)間格式
HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式
YY-MM-DD
接口
并聯(lián)
電源電壓
2.7 V ~ 3.3 V，4.5 V ~ 5.5 V
電壓 - 電源，電池
-
工作溫度
0°C ~ 70°C
安裝類型
通孔
封裝/外殼
28-DIP（0.600"，15.24mm）
供應(yīng)商設(shè)備封裝
28-PDIP
包裝
管件

DS1688相關(guān)型號(hào)PDF文件下載

型號(hào)

版本

描述

廠商

下載
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英文版

Elapsed Time Counter

DS1602
DS1603

英文版

TRI-STATE Dual Receiver

NSC

DS1603
DS1603

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TRI-STATE ? Dual Receiver

DS1603
DS1603

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Elapsed Time Counter Module

DS1603
DS1608

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Analog Timer Circuit

ETC

DS1608
DS1608

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Analog Timer Circuit

DS1608
DS1609

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Dual Port RAM

DS1609
DS1610

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Partitioned NV Controller

ETC

DS1610
DS1610

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Partitioned NV Controller

DS1610
DS1611

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Power Supply Supervisor

ETC

DS1611
DS1611

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Power Supply Supervisor

DS1611
DS1612

英文版

Battery Management

ETC

DS1612
DS1612

英文版

Battery Management

DS1612
DS1615

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Temperature Recorder

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DS1616

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Temperature and Three Input MUX'ed 8-Bit Data Recorder

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Digital Thermometer and Thermostat

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DS1621

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Digital Thermometer and Thermostat

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DS1622

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Industrial Control IC

ETC

DS1622
DS1622

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Industrial Control IC

DS1622
DS1623

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IC-DIGITAL THERMOSTAT

ETC

DS1623

DS1688 Datasheet

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