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DS1688/DS1691
PIN DESCRIPTION
PIN
SO
EDIP
NAME
FUNCTION
1
VBAUX
Auxiliary Battery Supply
2, 3
—
X1, X2
Crystal Input, Crystal Output
4
RCLR
Active-Low RAM Clear Input
5–12
AD0–AD7
Muxed Address/Data Bus
13
PWR
Active-Low Power-On Interrupt Output
14, 19
14
GND
Ground
15
KS
Active-Low Kickstart Input
16
CS
Active-Low Chip Select Input
17
ALE
Address Strobe
18
WR
Active-Low Write Data Strobe
20
RD
Active-Low Read Data Strobe
21
PSEL
+3V or +5V Power Select
22
IRQ
Active-Low Interrupt Request Output
23
—
VBAT
Battery + Supply
24
SQW
Square-Wave Output. This signal functions identical to the
DS1689/DS1693 with an exception occurring at power-up. A
32kHz square wave is output on this pin, tREC, after a power-up
condition has been detected. This condition sets the following
bits, enabling the 32kHz output: DV1 = 1, SQWE = 1, and E32K
= 1. The square wave is output on this pin if either SQWE = 1 or
E32K = 1.
25
VCCO
RAM Power-Supply Output
26
VCCI
+3V or +5V Main Supply
27
CEO
Active-Low RAM Chip Enable Out
28
CEI
Active-Low RAM Chip Enable In
—
2, 3, 19,
23
N.C.
No Connection
PACKAGE INFORMATION
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
28 SO
F28+3
21-0251
28 PDIP
P28-6
21-0044
28 EDIP
MDP28-2
21-0241
3 of 3
Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product. No
circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.
M a x i m In tegra t ed P r oduc ts , 1 2 0 S a n Ga brie l D r iv e , Sun ny vale , CA 94 086 40 8 - 7 3 7 - 76 00
2005 Maxim Integrated Products
The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation.
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相关代理商/技术参数
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DS1689_05 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control
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DS1689S/R 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control
DS1689S/T 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Serialized Real-Time Clocks with NV RAM Control
DS1689S/T&R 制造商:Rochester Electronics LLC 功能描述:
DS1689S/T&R 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
DS1689S/T&R/ 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube