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參數資料
| 型號： | BQ3285ESSN |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁數： | 1/37頁 |
| 文件大小： | 1438K |
| 代理商： | BQ3285ESSN |
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Features
Direct clock/calendar replace-
ment 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 man-
agement
System wake-up capability—
alarm interrupt output active in
battery-backup mode
Less than 0.5
A load under bat-
tery 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 adjust-
ment
Time of day in seconds, minutes,
and hours
- 12- or 24-hour format
- Optional daylight saving
adjustment
Programmable square wave out-
put
Three individually maskable in-
terrupt event flags:
- Periodic rates from 122s to
500ms
- Time-of-day alarm once per
second to once per day
- End-of-clock update cycle
24-pin plastic DIP, SOIC, or
SSOP
General Description
The CMOS bq3285E/L is a low-
power microprocessor peripheral
providing a time-of-day clock and
100-year calendar with alarm fea-
tures 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 ac-
tivities. Wake-up capability is pro-
vided 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 oper-
ates the clock and calendar.
The bq3285E/L 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 bat-
tery.
1
SLUS004A -DECEMBER 1993 - REVISED MAY 2004
bq3285E/L
Real-Time Clock (RTC)
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
SQW
Square wave output
EXTRAM
Extended RAM enable
RCL
RAM clear input
BC
3V backup cell input
X1–X2
Crystal inputs
VCC
Power supply
VSS
Ground
1
PN3285E1.eps
24-Pin DIP or SOIC/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
SQW
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
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|---|---|
| BQ3285LCSS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285ECSS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ4285Q | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| BRN1-09P-TA1 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
| BRN1-09P-TA2 | 9 CONTACT(S), MALE, D NANOMINIATURE CONNECTOR, SOLDER, PLUG |
相關代理商/技術參數 |
參數描述 |
|---|---|
| BQ3285ESS-N | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| BQ3285ESSTR | 功能描述:實時時鐘 w/242x8 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ3285ESS-TR1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| BQ3285ESSTRG4 | 功能描述:實時時鐘 w/242x8 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| BQ3285ESTR | 功能描述:實時時鐘 w/242x8 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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