BQ3285 Status: ACTIVE

RTC IC with 114x8 NVSRAM

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Datasheet

bq3285 - Real-Time Clock (RTC) (Rev. A) (bq3285.pdf, 847 KB)
26 May 2004 Download

	BQ3285	BQ3285E	BQ3285LD	BQ3285LF
Supply Voltage(V)	5	5	3	3
Bus Interface	Multiplexed	Multiplexed	Multiplexed	Multiplexed
Memory Density(Kb)	0.114	0.242	0.242	0.242
Operating Temp Range(Celsius)	0 to 70	0 to 70	0 to 70
Pin/Package	24PDIP,24SOIC	24PDIP,24SOIC,24SSOP/QSOP	24SSOP/QSOP	24SSOP/QSOP
Approx. Price (US$)	2.10 \| 1ku	2.10 \| 1ku	2.10 \| 1ku	2.10 \| 1ku
RTC Bytes		14	14	14
	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory

Customers Who Evaluated This Product Also Evaluated

BQ3285E: RTC IC with 242x8 NVSRAM Alarm Wake-up
BQ4845: RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning
MAX232: Dual EIA-232 Driver/Receiver

Product Information

Features

Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
Functionally compatible with the DS1285
- Closely matches MC146818A pin configuration
114 bytes of general nonvolatile storage
160ns cycle time allows fast bus operation
Selectable Intel or Motorola bus timing
Less than 0.5µA load under battery operation
14 bytes for clock/calendar and control
BCD or binary format for clock and calendar data
Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
Time of day in seconds, minutes, and hours
- 12- or 24-hour format
- Optional daylight saving adjustment
Programmable square wave output
Three individually maskable interrupt event flags:
- Periodic rates from 122us to 500ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
24-pin plastic DIP or SOIC

Description

The CMOS bq3285 is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.

The bq3285 write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.

The bq3285 is a fully compatible real-time clock for IBM AT compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
BQ3285P-SB2	ACTIVE	0 to 70	2.10 \| 1ku	PDIP (N) \| 24	View	15 \| TUBE
BQ3285P-SB2E3	ACTIVE	0 to 70	2.10 \| 1ku	PDIP (N) \| 24	View	15 \| TUBE
BQ3285S-SB2	ACTIVE	0 to 70	2.10 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE
BQ3285S-SB2G4	ACTIVE	0 to 70	2.10 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE
BQ3285S-SB2TR	ACTIVE	0 to 70	2.10 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R	Purchase Samples
BQ3285S-SB2TRG4	ACTIVE	0 to 70	2.10 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R	Purchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

	TI Inventory Status			Reported Distributor Inventory
BQ3285P-SB2	As of 9:15 AM GMT, 07 Oct 2008			As of 9:15 AM GMT, 07 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	>10k*	510 \| 8 Oct	6 Weeks	Americas	Arrow	4
		864 \| 27 Oct			Avnet	90
		>10k \| 17 Nov			DigiKey	410
					Rochester Electronics	>1k
BQ3285P-SB2E3	As of 9:15 AM GMT, 07 Oct 2008			As of 9:15 AM GMT, 07 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	>10k*	510 \| 8 Oct	6 Weeks	None Reported View Distributors
		864 \| 27 Oct
		>10k \| 17 Nov
BQ3285S-SB2	As of 9:15 AM GMT, 07 Oct 2008			As of 9:15 AM GMT, 07 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	225*	1672 \| 27 Oct	6 Weeks	Americas	Avnet	42
		4845 \| 24 Nov			DigiKey	2
					Mouser Electronics	10
					Rochester Electronics	150
				Europe	Abacus Polar	25
				Europe	EBV Elektronik	13
BQ3285S-SB2G4	As of 9:15 AM GMT, 07 Oct 2008			As of 9:15 AM GMT, 07 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	225*	1672 \| 27 Oct	6 Weeks	None Reported View Distributors
	225*	4845 \| 24 Nov	6 Weeks
BQ3285S-SB2TR	As of 9:15 AM GMT, 07 Oct 2008			As of 9:15 AM GMT, 07 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4859 \| 15 Dec	10 Weeks	Americas	Rochester Electronics	>1k
	0*		10 Weeks	Europe	Abacus Polar	>1k
BQ3285S-SB2TRG4	As of 9:15 AM GMT, 07 Oct 2008			As of 9:15 AM GMT, 07 Oct 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	4859 \| 15 Dec	10 Weeks	None Reported View Distributors
View all Distributors

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
BQ3285P-SB2	Pb-Free (RoHS)	A42 SN	N/A for Pkg Type	View	View
BQ3285P-SB2E3	Pb-Free (RoHS)	A42 SN	N/A for Pkg Type	View	View
BQ3285S-SB2	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
BQ3285S-SB2G4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
BQ3285S-SB2TR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
BQ3285S-SB2TRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

bq3285 - Real-Time Clock (RTC) (Rev. A) (bq3285.pdf, 847 KB)
26 May 2004 Download

Application Notes

Using RAM Clear Function With bq3285/bq3287A RTCs (slua052.htm, 8 KB)
05 Sep 1999 Abstract
U-502 Time-Base Oscillator for RTC IC (slua051.htm, 8 KB)
05 Sep 1999 Abstract
U-503 Using the bq3285/7E in a Green or Portable Environment (slua094.htm, 8 KB)
05 Sep 1999 Abstract

Alternative Products - Are similar to BQ3285
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Comments
BQ3285E	RTC IC with 242x8 NVSRAM Alarm Wake-up	TI customers also evaluated this product.
BQ4845	RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning	TI customers also evaluated this product.

Complementary Products - Can be used with BQ3285
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
MAX232	Dual EIA-232 Driver/Receiver	INTERFACE (SL)-RS-232 (SL)	TI customers also evaluated this product.

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BQ3285 Status: ACTIVE

RTC IC with 114x8 NVSRAM

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