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licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
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DS3234
Extremely Accurate SPI Bus RTC
with Integrated Crystal and SRAM
Revision History
REVI
S
ION
NUMBER
REVI
S
ION
DATE
DE
S
CRIPTION
PAGE
S
CHANGED
0
2/06
Initial release
—
Clarified the behavior of t
REC
on initial power-up in the
RST
description of the
Pin
Description
8
1
7/07
Corrected the POR for the BB32kHz bit from 0 to 1
15
Updated the
Typical Operating Circuit
1
Removed the V
PU
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 I
BATT
parameter and changed the symbols for Timekeeping Battery Current,
Temperature Conversion Current, and Data-Retention Current from I
BAT
, I
TC
, and
I
BATTC
to I
BATT
, I
BATTC
, and I
BATTDR
, respectively
3
In the
AC Electrical Characteristics
, changed the t
CWH
specification from 400ns
(max) to 400ns (min)
4
Added the Delta Time and Frequency vs. Temperature graph in the
Typical
Operating Characteristics
section
7
Updated the
Block Diagram
9
Added the
V
BAT
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
2
10/08
Corrected the description of when the countdown chain is reset in the
Clock and
Calendar
section
11
3
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
4
3/15
Updated
Benefits and Features
section
1
