 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
BQ3285ECSS Datasheet(PDF) 1 Page - Texas Instruments |
|
|
|||||||||||||||||||||||||||||
BQ3285ECSS Datasheet(HTML) 1 Page - Texas Instruments |
|
|
1 / 26 page  Features ® Direct clock/calendar replace- ment for IBM ® AT-compatible computers and other applications ® 2.7–5.5V operation (bq3285LC); 4.5–5.5V operation (bq3285EC) ® 242 bytes of general nonvolatile storage ® Dedicated 32.768kHz output pin ® System wake-up capability— alarm interrupt output active in battery-backup mode ® Less than 0.5 µA load under bat- tery operation ® Selectable Intel or Motorola bus timing ® 24-pin plastic SOIC or SSOP General Description The CMOS bq3285EC/LC is a low- power microprocessor peripheral pro- viding a time-of-day clock and 100- year calendar with alarm features and battery operation. The architec- ture is based on the bq3285/7 RTC with added features: low-voltage op- eration, 32.768kHz output, and an extra 128 bytes of CMOS. A 32.768kHz output is available for sustaining power-management ac- tivities. The bq3285EC 32kHz out- put is always on whenever VCC is valid. For the bq3285LC, the output is on when the oscillator is turned on. In VCC standby mode, the 32kHz is active, and the bq3285LC typically draws 100 µA while the bq3285EC typically draws 300 µA. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode. In battery backup mode, current drain is less than 500nA. The bq3285EC/LC write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and oper- ates the clock and calendar. The bq3285EC/LC is a fully com- patible real-time clock for IBM AT- compatible computers and other ap- plications. The only external compo- nents are a 32.768kHz crystal and a backup battery. The bq3285EC is intended for use in 5V systems. The bq3285LC is in- tended for use in 3V systems; the bq3285LC, however, may also oper- ate at 5V and then go into a 3V power-down state, write-protecting as if in a 3V system. 1 1 PN3285EC.eps 24-Pin SSOP 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 9 10 16 15 11 12 14 13 VCC 32k EXTRAM BC INT RST DS VSS R/W AS CS MOT X1 X2 AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 VSS RCL bq3285EC/LC Pin Connections Pin Names July 1996 AD0–AD7 Multiplexed address/ data input/output MOT Bus type select input CS Chip select input AS Address strobe input DS Data strobe input R/W Read/write input INT Interrupt request output RST Reset input 32K 32.768kHz output EXTRAM Extended RAM enable RCL RAM clear input BC 3V backup cell input X1–X2 Crystal inputs VCC Power supply VSS Ground Real-Time Clock (RTC) |
Similar Part No. - BQ3285ECSS |
|
Similar Description - BQ3285ECSS |
|
|
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
British ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
