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參數(shù)資料
| 型號： | BQ3285LDSSTRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | XO, clock |
| 英文描述： | REAL TIME CLOCK, PDSO24 |
| 封裝： | 0.150 INCH, GREEN, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 1/27頁 |
| 文件大?。?/td> | 170K |
| 代理商： | BQ3285LDSSTRG4 |
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Features
ACPI-compliant
day-of-month alarm
Direct clock/calendar replace-
ment for IBM
AT-compatible
computers and other applications
2.7–5.5V operation (bq3285LD);
4.5–5.5V operation (bq3285ED)
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 0.55
A load under bat-
tery operation
Selectable Intel or Motorola bus
timing
24-pin plastic SSOP
General Description
The CMOS bq3285ED/LD 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, 128 addi-
tional bytes of CMOS, and a day-of-
month alarm to be compliant with
the ACPI RTC specification.
A 32.768kHz output is available for
sustaining power-management ac-
tivities.
The bq3285ED/LD 32kHz
output is always on whenever VCC is
valid.
In VCC standby mode, the
32kHz is active, and the bq3285LD
typically draws 100
A while the
bq3285ED typically draws 300
A.
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 550nA.
The bq3285ED/LD 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 bq3285ED/LD 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 bq3285ED is intended for use in
5V systems.
The bq3285LD is in-
tended for use in 3V systems; the
bq3285LD, 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
Real-Time Clock (RTC)
bq3285ED/LD
1
PN3285ED/LD.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
Pin Connections
Pin Names
July 1997
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BQ3285LDSS | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285EDSS | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285LSS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285S | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3387P | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ3285LF | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Y2K-Enhanced Real-Time Clock (RTC) |
| BQ3285LF-SS | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Y2K-Enhanced Real-Time Clock (RTC) |
| BQ3285LFSS-A1 | 功能描述:實時時鐘 w/240x8 NVSRAM Alarm Wake-up RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ3285LFSS-A1G4 | 功能描述:實時時鐘 w/240x8 NVSRAM Alarm Wake-up RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ3285LFSS-A1TR | 功能描述:實時時鐘 w/240x8 NVSRAM Alarm Wake-up RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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