DS3234S#【PDF 14/21 页】IC RTC W/TCXO 20-SOIC

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Sheet目录1994

10页 11页 12页 13页 [14页]15页 16页 17页 18页

DS3234

Extremely Accurate SPI Bus RTC with

Integrated Crystal and SRAM

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21

2010 Maxim Integrated Products

Maxim is a registered trademark of Maxim Integrated Products, Inc.

is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGES

CHANGED

2/06

Initial release

—

Clarified the behavior of tREC on initial power-up in the RST description of the Pin

Description

7/07

Corrected the POR for the BB32kHz bit from 0 to 1

Updated the Typical Operating Circuit

Removed the VPU parameter from the Recommended DC Operating Conditions

table and added verbiage about the pullup to the Pin Description table for

INT/SQW

2, 8

In the Electrical Characteristics table, added CRATE1 = CRATE0 = 0 to the IBATT

parameter and changed the symbols for Timekeeping Battery Current,

Temperature Conversion Current, and Data-Retention Current from IBAT, ITC, and

IBATTC to IBATT, IBATTC, and IBATTDR, respectively

In the AC Electrical Characteristics, changed the tCWH specification from 400ns

(max) to 400ns (min)

Added the Delta Time and Frequency vs. Temperature graph in the Typical

Operating Characteristics section

Updated the Block Diagram

Added the VBAT Operation section, improved some sections of text for the

Pushbutton Reset Function, Aging Offset Register (10h/90h), and Temperature

Registers (11h–12h) sections

10, 16

10/08

Corrected the description of when the countdown chain is reset in the Clock and

Calendar section

7/10

In the Absolute Maximum Ratings section, added the theta-JA and theta-JC

thermal resistances and Note 1, and changed the soldering temperature to

+260°C; changed the 10-hour bit to 20-hour bit in the Clock and Calendar section

and Table 1; updated the BBSQW bit description in the Control Register

(0Eh/8Eh) section; added the land pattern no. to the Package Information table

2–5, 8, 11, 12,

14, 20

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