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DS12885

Description
1 TIMER(S), REAL TIME CLOCK, PDIP24
CategoryThe embedded processor and controller    Microcontrollers and processors   
File Size128KB,4 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
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DS12885 Overview

1 TIMER(S), REAL TIME CLOCK, PDIP24

DS12885 Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerDALLAS
package instructionDIP-24
Reach Compliance Codeunknow
Other featuresDAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING
External data bus width8
Information access methodsPARALLEL, MUXED BUS
interrupt capabilityY
JESD-30 codeR-PDIP-T24
JESD-609 codee0
Number of terminals24
Number of timers1
On-chip data RAM width8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output clock frequency0.008192 MHz
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP24,.6
Package shapeRECTANGULAR
Package formIN-LINE
power supply5 V
Certification statusNot Qualified
RAM (number of words)114
Maximum slew rate15 mA
Maximum supply voltage5.5 V
Minimum supply voltage4.5 V
Nominal supply voltage5 V
surface mountNO
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
shortest timeSECONDS
VolatileYES
uPs/uCs/peripheral integrated circuit typeTIMER, REAL TIME CLOCK
www.maxim-ic.com
DS12885/DS12885Q/DS12885T
Real-Time Clock
PIN ASSIGNMENT (Top View)
DS12885, 24 DIP
DS12885S, 24 SO 300mil
www.maxim-ic.com
FEATURES
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Drop- in replacement for IBM AT computer
clock/calendar
Pin configuration closely matches
MC146818B and DS1285
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-hour or 24-hour clock with AM and PM in
12-hour mode
Daylight Savings Time option
Selectable between Motorola and Intel bus
timing
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 122µs to 500ms
End-of-clock update cycle
Optional 28-pin PLCC surface mount package
or 32-pin TQFP
Optional industrial temperature range
available
Underwriters Laboratory (UL) recognized
DS12885Q
28 PLCC
DS12885T
32 TQFP
Package Dimension Information
http://www.maxim-ic.com/TechSupport/DallasPackInfo.htm
Note:
Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here:
http://www.maxim-ic.com/errata.
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DS12885 Related Products

DS12885 DS12885Q DS12885Q/TR DS12885S DS12885N DS12885T DS12885QN DS12885T/TR DS12885TN
Description 1 TIMER(S), REAL TIME CLOCK, PDIP24 1 TIMER(S), REAL TIME CLOCK, PQCC28 Real-Time Clock 1 TIMER(S), REAL TIME CLOCK, PDSO24 1 TIMER(S), REAL TIME CLOCK, PDIP24 1 TIMER(S), REAL TIME CLOCK, PQFP32 1 TIMER(S), REAL TIME CLOCK, PQCC28 Real-Time Clock 1 TIMER(S), REAL TIME CLOCK, PDIP24
Is it Rohs certified? incompatible incompatible - incompatible - incompatible incompatible - -
Maker DALLAS DALLAS DALLAS DALLAS - DALLAS DALLAS DALLAS -
package instruction DIP-24 PLASTIC, LCC-28 - SOIC-24 - TQFP-32 PLASTIC, LCC-28 - -
Reach Compliance Code unknow unknown unknown unknown - unknown unknown unknown -
Other features DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING - DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING - DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING - -
External data bus width 8 8 - 8 - 8 8 - -
Information access methods PARALLEL, MUXED BUS PARALLEL, MUXED BUS - PARALLEL, MUXED BUS - PARALLEL, MUXED BUS PARALLEL, MUXED BUS - -
interrupt capability Y Y - Y - Y Y - -
JESD-30 code R-PDIP-T24 S-PQCC-J28 - R-PDSO-G24 - S-PQFP-G32 S-PQCC-J28 - -
JESD-609 code e0 e0 - e0 - e0 e0 - -
Number of terminals 24 28 - 24 - 32 28 - -
Number of timers 1 1 - 1 - 1 1 - -
On-chip data RAM width 8 8 - 8 - 8 8 - -
Maximum operating temperature 70 °C 70 °C - 70 °C - 70 °C 85 °C - -
Maximum output clock frequency 0.008192 MHz 0.008192 MHz - 0.008192 MHz - 0.008192 MHz 0.008192 MHz - -
Package body material PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY - -
encapsulated code DIP QCCJ - SOP - QFP QCCJ - -
Encapsulate equivalent code DIP24,.6 LDCC28,.5SQ - SOP24,.4 - TQFP32,.35SQ,32 LDCC28,.5SQ - -
Package shape RECTANGULAR SQUARE - RECTANGULAR - SQUARE SQUARE - -
Package form IN-LINE CHIP CARRIER - SMALL OUTLINE - FLATPACK CHIP CARRIER - -
power supply 5 V 5 V - 5 V - 5 V 5 V - -
Certification status Not Qualified Not Qualified - Not Qualified - Not Qualified Not Qualified - -
RAM (number of words) 114 114 - 114 - 114 114 - -
Maximum supply voltage 5.5 V 5.5 V - 5.5 V - 5.5 V 5.5 V - -
Minimum supply voltage 4.5 V 4.5 V - 4.5 V - 4.5 V 4.5 V - -
Nominal supply voltage 5 V 5 V - 5 V - 5 V 5 V - -
surface mount NO YES - YES - YES YES - -
technology CMOS CMOS - CMOS - CMOS CMOS - -
Temperature level COMMERCIAL COMMERCIAL - COMMERCIAL - COMMERCIAL INDUSTRIAL - -
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) - Tin/Lead (Sn/Pb) - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) - -
Terminal form THROUGH-HOLE J BEND - GULL WING - GULL WING J BEND - -
Terminal pitch 2.54 mm 1.27 mm - 1.27 mm - 0.8 mm 1.27 mm - -
Terminal location DUAL QUAD - DUAL - QUAD QUAD - -
shortest time SECONDS SECONDS - SECONDS - SECONDS SECONDS - -
Volatile YES YES - YES - YES YES - -
uPs/uCs/peripheral integrated circuit type TIMER, REAL TIME CLOCK TIMER, REAL TIME CLOCK - TIMER, REAL TIME CLOCK - TIMER, REAL TIME CLOCK TIMER, REAL TIME CLOCK - -
Base Number Matches - 1 1 1 - 1 1 1 -
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