DS12885T datasheet, PDF - EEWORLD Datasheet

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DS12885T: Description1 TIMER(S), REAL TIME CLOCK, PQFP32; CategoryThe embedded processor and controller Microcontrollers and processors; File Size128KB，4 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS12885T Overview

1 TIMER(S), REAL TIME CLOCK, PQFP32

DS12885T Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	DALLAS
package instruction	TQFP-32
Reach Compliance Code	unknown
Other features	DAYLIGHT SAVINGS OPTION; SELECTABLE MOTOROLA/INTEL TIMING
External data bus width	8
Information access methods	PARALLEL, MUXED BUS
interrupt capability	Y
JESD-30 code	S-PQFP-G32
JESD-609 code	e0
Number of terminals	32
Number of timers	1
On-chip data RAM width	8
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output clock frequency	0.008192 MHz
Package body material	PLASTIC/EPOXY
encapsulated code	QFP
Encapsulate equivalent code	TQFP32,.35SQ,32
Package shape	SQUARE
Package form	FLATPACK
power supply	5 V
Certification status	Not Qualified
RAM (number of words)	114
Maximum slew rate	15 mA
Maximum supply voltage	5.5 V
Minimum supply voltage	4.5 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.8 mm
Terminal location	QUAD
shortest time	SECONDS
Volatile	YES
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK
Base Number Matches	1

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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

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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DS12885T Related Products

	DS12885T	DS12885	DS12885Q	DS12885Q/TR	DS12885S	DS12885N	DS12885QN	DS12885T/TR	DS12885TN
Description	1 TIMER(S), REAL TIME CLOCK, PQFP32	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, 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	TQFP-32	DIP-24	PLASTIC, LCC-28	-	SOIC-24	-	PLASTIC, LCC-28	-	-
Reach Compliance Code	unknown	unknow	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	S-PQFP-G32	R-PDIP-T24	S-PQCC-J28	-	R-PDSO-G24	-	S-PQCC-J28	-	-
JESD-609 code	e0	e0	e0	-	e0	-	e0	-	-
Number of terminals	32	24	28	-	24	-	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	QFP	DIP	QCCJ	-	SOP	-	QCCJ	-	-
Encapsulate equivalent code	TQFP32,.35SQ,32	DIP24,.6	LDCC28,.5SQ	-	SOP24,.4	-	LDCC28,.5SQ	-	-
Package shape	SQUARE	RECTANGULAR	SQUARE	-	RECTANGULAR	-	SQUARE	-	-
Package form	FLATPACK	IN-LINE	CHIP CARRIER	-	SMALL OUTLINE	-	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	YES	NO	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	GULL WING	THROUGH-HOLE	J BEND	-	GULL WING	-	J BEND	-	-
Terminal pitch	0.8 mm	2.54 mm	1.27 mm	-	1.27 mm	-	1.27 mm	-	-
Terminal location	QUAD	DUAL	QUAD	-	DUAL	-	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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Shortcut: L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 LA LB LC LD LE LF LG LH LI LJ LK LL LM LN LO LP LQ LR LS LT LU LV LW LX LY LZ M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 MA MB MC MD ME MF MG MH MI MJ MK ML MM MN MO MP MQ MR MS MT MU MV MW MX MY MZ N0 N1 N2 N3 N4 N5 N6 N7 N8 NA NB NC ND NE NF NG NH NI NJ NK NL NM NN NO NP NQ NR NS NT NU NV NX NZ O0 O1 O2 O3 OA OB OC OD OE OF OG OH OI OJ OK OL OM ON OP OQ OR OS OT OV OX OY OZ P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PJ PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY PZ Q1 Q2 Q3 Q4 Q5 Q6 Q8 Q9 QA QB QC QE QF QG QH QK QL QM QP QR QS QT QV QW QX QY R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 RA RB RC RD RE RF RG RH RI RJ RK RL RM RN RO RP RQ RR RS RT RU RV RW RX RY RZ

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