Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

DS1643-85 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # DS1643-85
Description  Nonvolatile Timekeeping RAMs
Download  17 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1643-85 Datasheet(HTML) 5 Page - Maxim Integrated Products

  DS1643-85 Datasheet HTML 1Page - Maxim Integrated Products DS1643-85 Datasheet HTML 2Page - Maxim Integrated Products DS1643-85 Datasheet HTML 3Page - Maxim Integrated Products DS1643-85 Datasheet HTML 4Page - Maxim Integrated Products DS1643-85 Datasheet HTML 5Page - Maxim Integrated Products DS1643-85 Datasheet HTML 6Page - Maxim Integrated Products DS1643-85 Datasheet HTML 7Page - Maxim Integrated Products DS1643-85 Datasheet HTML 8Page - Maxim Integrated Products DS1643-85 Datasheet HTML 9Page - Maxim Integrated Products Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 17 page
background image
DS1643/DS1643P
5 of 17
CLOCK ACCURACY (DIP MODULE)
The DS1643 is guaranteed to keep time accuracy to within
1 minute per month at 25C.
CLOCK ACCURACY (POWERCAP MODULE)
The DS1643P and DS9034PCX are each individually tested for accuracy. Once mounted together, the
module is guaranteed to keep time accuracy to within
1.53 minutes per month (35ppm) at 25C.
Table 2. Register Map—Bank1
DATA
ADDRESS
B7
B6
B5
B4
B3
B2
B1
B0
FUNCTION
RANGE
1FFF
Year
00-99
1FFE
X
X
X
Month
01-12
1FFD
X
X
Date
01-31
1FFC
X
Ft
X
X
X
Day
01-07
1FFB
X
X
Hour
00-23
1FFA
X
Minutes
00-59
1FF9
OSC
Seconds
00-59
1FF8
W
R
X
X
X
X
X
X
Control
A
OSC = STOP BIT
R = READ BIT
FT = FREQUENCY TEST
W = WRITE BIT
X = UNUSED
Note: All indicated “X” bits are not used but must be set to “0” for proper clock operation.
RETRIEVING DATA FROM RAM OR CLOCK
The DS1643 is in the read mode whenever WE (write enable) is high and CE (chip enable) is low. The
device architecture allows ripple-through access to any of the address locations in the NV SRAM. Valid
data will be available at the DQ pins within tAA after the last address input is stable, providing that the CE
and OE access times and states are satisfied. If CE or OE access times are not met, valid data will be
available at the latter of chip enable access (tCEA) or at output enable access time (tOEA). The state of the
data input/output pins (DQ) is controlled by CE and OE . If the outputs are activated before tAA , the data
lines are driven to an intermediate state until tAA. If the address inputs are changed while CE and OE
remain valid, output data will remain valid for output data hold time (tOH) but will then go indeterminate
until the next address access.
WRITING DATA TO RAM OR CLOCK
The DS1643 is in the write mode whenever WE and CE are in their active state. The start of a write is
referenced to the latter occurring transition of WE or CE . The addresses must be held valid throughout
the cycle. CE or WE must return inactive for a minimum of tWR prior to the initiation of another read or
write cycle. Data in must be valid tDS prior to the end of write and remain valid for tDH afterward. In a
typical application, the OE signal will be high during a write cycle. However, OE can be active provided
that care is taken with the data bus to avoid bus contention. If OE is low prior to WE transitioning low
the data bus can become active with read data defined by the address inputs. A low transition on WE will
then disable the outputs tWEZ after WE goes active.


Similar Part No. - DS1643-85

ManufacturerPart #DatasheetDescription
logo
Dallas Semiconductor
DS1643-100 DALLAS-DS1643-100 Datasheet
81Kb / 11P
   Nonvolatile Timekeeping RAM
DS1643-100 DALLAS-DS1643-100 Datasheet
182Kb / 14P
   Nonvolatile Timekeeping RAM
logo
Maxim Integrated Produc...
DS1643-100 MAXIM-DS1643-100 Datasheet
225Kb / 17P
   Nonvolatile Timekeeping RAMs
Rev 12/09
logo
ARTSCHIP ELECTRONICS CO...
DS1643-100 ARTSCHIP-DS1643-100 Datasheet
316Kb / 11P
   Nonvolatile Timekeeping RAM
logo
Maxim Integrated Produc...
DS1643-100++ MAXIM-DS1643-100+ Datasheet
225Kb / 17P
   Nonvolatile Timekeeping RAMs
Rev 12/09
More results

Similar Description - DS1643-85

ManufacturerPart #DatasheetDescription
logo
Maxim Integrated Produc...
DS1643 MAXIM-DS1643 Datasheet
225Kb / 17P
   Nonvolatile Timekeeping RAMs
Rev 12/09
DS1744_1203 MAXIM-DS1744_1203 Datasheet
583Kb / 16P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
Rev 3/12
logo
Dallas Semiconductor
DS1747 DALLAS-DS1747 Datasheet
340Kb / 18P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
logo
ARTSCHIP ELECTRONICS CO...
DS1744 ARTSCHIP-DS1744 Datasheet
413Kb / 19P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
logo
Maxim Integrated Produc...
DS1747 MAXIM-DS1747_12 Datasheet
606Kb / 16P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
Rev 3/12
DS1743 MAXIM-DS1743_V01 Datasheet
441Kb / 17P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
196719 ; Rev 9 / 13
logo
Dallas Semiconductor
DS1746 DALLAS-DS1746 Datasheet
453Kb / 18P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
DS1744 DALLAS-DS1744 Datasheet
348Kb / 18P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
logo
Maxim Integrated Produc...
DS1746 MAXIM-DS1746_12 Datasheet
529Kb / 16P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
Rev 3/12
DS1747 MAXIM-DS1747_10 Datasheet
213Kb / 16P
   Y2K-Compliant, Nonvolatile Timekeeping RAMs
19-5504; Rev 9/10
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com