Datasheet Texas Instruments BQ4845 — 数据表

制造商	Texas Instruments
系列	BQ4845

RTC IC W NVSRAM控制，看门狗定时器，uP复位，中断和电池电量低警告

数据表

PDF, 1.6 Mb, 档案已发布: Sep 5, 1999

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	BQ4845P-A4	BQ4845S-A4	BQ4845S-A4G4	BQ4845S-A4N	BQ4845S-A4NG4	BQ4845S-A4NTR	BQ4845S-A4NTRG4	BQ4845S-A4TR	BQ4845S-A4TRG4
Lifecycle Status	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect)	NRND (Not recommended for new designs)	NRND (Not recommended for new designs)
Manufacture's Sample Availability	No	No	No	No	No	No	No	No	No

	BQ4845P-A4	BQ4845S-A4	BQ4845S-A4G4	BQ4845S-A4N	BQ4845S-A4NG4	BQ4845S-A4NTR	BQ4845S-A4NTRG4	BQ4845S-A4TR	BQ4845S-A4TRG4
N	1	2	3	4	5	6	7	8	9
Pin	28	28	28	28	28	28	28	28	28
Package Type	N	DW	DW	DW	DW	DW	DW	DW	DW
Industry STD Term	PDIP	SOIC	SOIC	SOIC	SOIC	SOIC	SOIC	SOIC	SOIC
JEDEC Code	R-PDIP-T	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDSO-G	R-PDSO-G
Package QTY	13	20	20	20	20	1000	1000	1000
Carrier	TUBE	TUBE	TUBE	TUBE	TUBE	LARGE T&R	LARGE T&R	LARGE T&R
Device Marking	4845P	4845S	4845S	4845S-N	-A4	4845S-N	4845S-N	4845S
Width (mm)	13.71	7.5	7.5	7.5	7.5	7.5	7.5	7.5	7.5
Length (mm)	36.32	17.9	17.9	17.9	17.9	17.9	17.9	17.9	17.9
Thickness (mm)	5.08	2.35	2.35	2.35	2.35	2.35	2.35	2.35	2.35
Pitch (mm)	2.54	1.27	1.27	1.27	1.27	1.27	1.27	1.27	1.27
Max Height (mm)	5.08	2.65	2.65	2.65	2.65	2.65	2.65	2.65	2.65
Mechanical Data	下载	下载	下载	下载	下载	下载	下载	下载	下载

	BQ4845P-A4	BQ4845S-A4	BQ4845S-A4G4	BQ4845S-A4N	BQ4845S-A4NG4	BQ4845S-A4NTR	BQ4845S-A4NTRG4	BQ4845S-A4TR	BQ4845S-A4TRG4
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Not Compliant
Pb Free	Yes	No

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Time-Base Oscillator for RTC ICs.The operation of the time-base oscillator is critical to the timekeeping functions of the bq3285, bq4285, and bq4845 series of real-time-clocks (RTCs). This application note describes some basic characteristics of the piezoelectric crystal and the on-chip crystal oscillator circuitry designed into these RTC series. It also includes suggestions for achieving timek
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PDF, 332 Kb, 档案已发布: Sep 5, 1999
Using the bq4845 for a Low-Cost RTC/NVSRAM Subsystem.The bq4845 combines on one IC a low-power real-time clock (RTC), a microcontroller supervisor, and a nonvolatile control circuit for static RAM. The part is the basis of a low-cost, reliable RTC plus nonvolatile SRAM subsystem for many embedded applications. This application note discusses the key aspects of bq4845 operation: component sele

系列: BQ4845 (9)