BQ3285E Status: ACTIVE

RTC IC with 242x8 NVSRAM Alarm Wake-up

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Datasheet

bq3285E/L - Real-Time Clock (RTC) (Rev. A) (PDF 1551 KB)
26 May 2004

	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

BQ32000: Serial RTC
BQ3285: RTC IC with 114x8 NVSRAM
BQ3287EA: RTC Module w 242x8 NVSRAM Alarm Wake-up RAM Clear Input on EA Version

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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
2.7–3.6V operation (bq3285L);
4.5–5.5V operation (bq3285E)
242 bytes of general nonvolatile storage
32.768kHz output for power management
System wake-up capability—alarm interrupt output active in battery-backup mode
Less than 0.5µA load under battery operation
Selectable Intel or Motorola bus timing
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

View All Features in Datasheet

Description

The CMOS bq3285E/L is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable interrupt sources, square-wave output, and 242 bytes of general nonvolatile storage.

A 32.768kHz output is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode.

The bq3285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.

The bq3285E/L is a fully compatible real-time clock for IBM AT-compatible computers and other applications.

View All Description in Datasheet

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
BQ3285EP	ACTIVE	0 to 70	2.10 \| 1ku	PDIP (N) \| 24	View	15 \| TUBE
BQ3285ES	ACTIVE	0 to 70	2.35 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE
BQ3285ESG4	ACTIVE	0 to 70	2.35 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE
BQ3285ESS	ACTIVE	0 to 70	2.35 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	50 \| TUBE
BQ3285ESSG4	ACTIVE	0 to 70	2.35 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	50 \| TUBE
BQ3285ESSTR	ACTIVE	0 to 70	2.10 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R	Purchase Samples
BQ3285ESSTRG4	ACTIVE	0 to 70	2.10 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R	Purchase Samples
BQ3285ESTR	ACTIVE		2.10 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R	Purchase Samples
BQ3285ESTRG4	ACTIVE		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

Reported Distributor Inventory as of 12:14 PM GMT, 20 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 14 WeeksBQ3285EP
Americas	Avnet	120
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	96
Worldwide	Mouser Electronics	115
TI Lead Time*: 20 WeeksBQ3285ES
Americas	Rochester Electronics	675
Europe	Avnet-SILICA	25
Worldwide	DigiKey	225
Worldwide	Mouser Electronics	125
TI Lead Time*: 20 WeeksBQ3285ESG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksBQ3285ESS
Americas	Newark	100
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	100
Worldwide	DigiKey	200
Worldwide	Mouser Electronics	50
TI Lead Time*: 20 WeeksBQ3285ESSG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksBQ3285ESSTR
Americas	Rochester Electronics	>1k
Europe	Abacus Polar	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksBQ3285ESSTRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksBQ3285ESTR
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksBQ3285ESTRG4
Worldwide	DigiKey	Available
View all Distributors

** 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
BQ3285EP	Pb-Free (RoHS)	A42 SN	N/A for Pkg Type	View	View
BQ3285ES	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
BQ3285ESG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
BQ3285ESS	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ3285ESSG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ3285ESSTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ3285ESSTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ3285ESTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
BQ3285ESTRG4	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

Most useful technical documents for BQ3285E

Datasheet

bq3285E/L - Real-Time Clock (RTC) (Rev. A) (PDF, 1551 KB)
26 May 2004

Application Notes

U-502 Time-Base Oscillator for RTC IC (HTM, 8 KB) 3155 views
05 Sep 1999 Read Abstract

Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
BQ32000	Serial RTC	CLOCKS AND TIMERS-REAL-TIME CLOCKS	TI customers also evaluated this product.
BQ3285	RTC IC with 114x8 NVSRAM	CLOCKS AND TIMERS-REAL-TIME CLOCKS	TI customers also evaluated this product.
BQ3287EA	RTC Module w 242x8 NVSRAM Alarm Wake-up RAM Clear Input on EA Version	CLOCKS AND TIMERS-REAL-TIME CLOCKS	TI customers also evaluated this product.
BQ3285LF	Y2K Enhanced ACPI Compliant RTC IC w 240x8 NVSRAM, Alarm Wake-up 3.3V op 32kHz Dedicated Output	CLOCKS AND TIMERS-REAL-TIME CLOCKS	TI customers also evaluated this product.
BQ4845	RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning	CLOCKS AND TIMERS-REAL-TIME CLOCKS	TI customers also evaluated this product.
BQ3287	RTC Module with 114x8 NVSRAM, RAM Clear Input on A Version	CLOCKS AND TIMERS-REAL-TIME CLOCKS	TI customers also evaluated this product.

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BQ3285E Status: ACTIVE

RTC IC with 242x8 NVSRAM Alarm Wake-up

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Datasheet

Customers Who Evaluated This Product Also Evaluated

Product Information

Features

Description

Pricing / Packaging / CAD Design Tools / Samples

Inventory

Quality & Lead (Pb)-Free Data

Technical Documents

Datasheet

Application Notes

Support and Community

Customer Tags

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