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参数资料
| 型号： | BQ3287EAMT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, DMA24 |
| 封装： | ROHS COMPLIANT, MODULE, DIP-24 |
| 文件页数： | 1/7页 |
| 文件大小： | 98K |
| 代理商： | BQ3287EAMT |
Features
Direct clock/calendar replace-
ment for IBM
AT-compatible
computers and other applications
Functionally compatible with
the
DS1287/DS1287A
and
MC146818A/ MC146818B
242 bytes of general nonvolatile
storage
Provides a 32.768kHz output for
power management
System wake-up capability—
alarm
interrupt
active
in
battery-backup mode
Integral lithium cell and crystal
160 ns cycle time allows fast bus
operation
14 bytes for clock/calendar and
control
Time of day in seconds, minutes,
and hours
- 12- or 24-hour format
- Optional daylight saving
adjustment
Calendar in day of the week, day
of the month, months, and years
with automatic leap-year adjust-
ment
Programmable square wave out-
put
Three individually maskable in-
terrupt event flags:
- Periodic rates from 122sto
500ms
- Time-of-day alarm once per
second to once per day
- End-of-clock update cycle
Better than one minute per
month clock accuracy
General Description
The CMOS bq3287E/bq3287EA is a
low-power microprocessor periph-
eral providing a time-of-day clock
and 100-year calendar with alarm
features and battery operation.
Other features include three
maskable interrupt sources, square-
wave output, and 242 bytes of gen-
eral
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
bq3287EA version is identical to the
bq3287E, with the addition of the
RAM clear input.
The bq3287E is a fully compatible
real-time clock for IBM AT-compatible
computers and other applications. The
bq3287E write-protects the clock, cal-
endar, and storage registers during
power failure. The integral backup en-
ergy source then maintains data and
operates the clock and calendar.
As shipped from Benchmarq, the
real time clock is turned off to maxi-
mize battery capacity for in-system
operation.
The bq3287E is functionally equiva-
lent to the bq3285E, except the bat-
tery (16,20) and crystal pins (2,3)
are not accessible. These pins are
connected internally to a coin cell
and quartz crystal. The coin cell is
sized to provide 10 years of data re-
tention and clock operation in the
absence of power. For a complete de-
scription of features, operating con-
ditions, electrical characteristics,
bus timing, and pin descriptions, see
the bq3285E data sheet.
1
Real-Time Clock (RTC) Module
bq3287E/bq3287EA
Sept. 1996 C
Pin Names
AD0–AD7 Multiplex address/data
input/output
MOT
CS
Chip select input
AS
Address strobe input
DS
Data strobe input
R/W
Read/write input
INT
Interrupt request output
1
PN3287E1.eps
24-Pin DIP Module
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
NC
INT
RST
DS
NC
R/W
AS
CS
MOT
NC
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
VSS
NC/RCL
RST
Reset input
SQW
Square wave output
EXTRAM
Extended RAM enable
NC
No connect
RCL
RAM clear input
(bq3287EA only)
VCC
+5V supply
VSS
Ground
Pin Connections
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BQ3287EMT | 功能描述:实时时钟 RTC with NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| BQ3287MT | 制造商:BENCHMARQ 功能描述: |
| BQ3287MT- | 制造商:TI 制造商全称:Texas Instruments 功能描述:Real-Time Clock RTC Module |
| BQ3287MT-I | 功能描述:实时时钟 RTC MODULE 114x8 NV RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| BQ3287MT-SB2 | 功能描述:实时时钟 RTC with NVSRAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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