DS14285 Datasheet: (DS14285 / DS14287) Real-Time Clock





DS14285 (DS14285 / DS14287) Real-Time Clock Datasheet

Part Number DS14285
Description (DS14285 / DS14287) Real-Time Clock
Manufacture Real-Time Clock
Total Page 26 Pages
PDF Download Download DS14285 Datasheet PDF

Features: DS14285/DS14287 Real-Time Clock with NV RAM Control Control www.maxim-ic.com F EATURES Direct Replacement for IBM AT C omputer Clock/Calendar Functionally Com patible with the DS1285/DS1287 Availabl e as Chip (DS14285, DS14285S, or DS1428 5Q) or Stand-Alone Module with Embedded Lithium Battery and Crystal (DS14287) Automatic Backup Supply and Write www.D ataSheet4U.com Protection to Make Exter nal SRAM Nonvolatile Counts Seconds, Mi nutes, Hours, Days, Day of the Week, Da te, Month, and Year with Leap Year Comp ensation Valid Up to 2100 Binary or BCD Representation of Time, Calendar, and Alarm 12- or 24-Hour Clock with AM and PM in 12-Hour Mode Daylight Saving Time Option Multiplex Bus for Pin Efficienc y Interfaced with Software as 128 RAM L ocations 14 Bytes of Clock and Control Registers 114 Bytes of General Purpose RAM Programmable Square-Wave Output Sig nal Bus-Compatible Interrupt Signals (I RQ) Three Interrupts are Separately Sof twareMaskable and Testable Time-of-Day Alarm Once/Second to Onc.

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www.maxim-ic.com
FEATURES
Direct Replacement for IBM AT
Computer Clock/Calendar
Functionally Compatible with the
DS1285/DS1287
Available as Chip (DS14285, DS14285S, or
DS14285Q) or Stand-Alone Module with
Embedded Lithium Battery and Crystal
(DS14287)
Automatic Backup Supply and Write
www.DataShPereott4eUc.tcionmto Make External SRAM
Nonvolatile
Counts Seconds, Minutes, Hours, Days,
Day of the Week, Date, Month, and Year
with Leap Year Compensation Valid Up
to 2100
Binary or BCD Representation of Time,
Calendar, and Alarm
12- or 24-Hour Clock with AM and PM in
12-Hour Mode
Daylight Saving Time Option
Multiplex Bus for Pin Efficiency
Interfaced with Software as 128 RAM
Locations
14 Bytes of Clock and Control Registers
114 Bytes of General Purpose RAM
Programmable Square-Wave Output
Signal
Bus-Compatible Interrupt Signals (IRQ)
Three Interrupts are Separately Software-
Maskable and Testable
Time-of-Day Alarm Once/Second to
Once/Day
Periodic Rates from 122ยตs to 500ms
End of Clock Update Cycle
Optional Industrial Temperature Version
Available: DS14285 DIP, SO, and PLCC
DS14285/DS14287
Real-Time Clock with NV RAM
Control Control
PIN CONFIGURATIONS
TOP VIEW
VCCO
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
DIP/SO
VCC
SQW
CEO
CEI
VBAT
IRQ
RESET
DS
GND
R/W
AS
CS
AD0
AD1
AD2
AD3
AD4
AD5
N.C.
4 3 2 1 28 27 26
5 25
6 24
7 DS14285 23
8 22
9 21
10 20
11 19
12 13 14 15 16 17 18
CEI
VBAT
IRQ
RESET
DS
GND
R/W
PLCC
VCCO
N.C.
N.C.
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1 24
2
3
23
DS14287 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
VCC
SQW
CEO
CEI
N.C.
IRQ
RESET
DS
N.C.
R/W
AS
CS
Encapsulated Package
1 of 26
REV: 112105

                    
                    






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