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参数资料
| 型号： | BQ3285S |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| 封装： | 0.300 INCH, PLASTIC, SOIC-24 |
| 文件页数： | 12/26页 |
| 文件大小： | 676K |
| 代理商： | BQ3285S |
Block Diagram
Pin Descriptions
MOT
Bus type select input
MOT selects bus timing for either Motorola
or Intel architecture.
This pin should be
tied to VCC for Motorola timing or to VSS for
Intel timing (see Table 1).
The setting
should not be changed during system opera-
tion.
MOT is internally pulled low by a
30K
resistor.
AD0–AD7
Multiplexed address/data input/
output
The bq3285 bus cycle consists of two
phases: the address phase and the data-
transfer phase.
The address phase pre-
cedes the data-transfer phase. During the
address phase, an address placed on
AD0–AD7 is latched into the bq3285 on the
falling edge of the AS signal. During the
data-transfer phase of the bus cycle, the
AD0–AD7 pins serve as a bidirectional data
bus.
AS
Address strobe input
AS serves to demultiplex the address/data
bus. The falling edge of AS latches the ad-
dress on AD0–AD7. This demultiplexing pro-
cess is independent of the CS signal.
For
DIP
and SOIC packages with MOT =
VCC, the AS input is provided a signal simi-
lar to ALE in an Intel-based system.
2
Bus
Type
MOT
Level
DS
Equivalent
R/W
Equivalent
AS
Equivalent
Motorola
VCC
DS,E,or
Φ2
R/W
AS
Intel
VSS
RD,
MEMR,or
I/OR
WR,
MEMW,or
I/OW
ALE
Table 1. Bus Setup
bq3285
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相关代理商/技术参数 |
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|---|---|
| BQ3285S- | 制造商:TI 制造商全称:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285S-SB2 | 功能描述:实时时钟 RTC IC with 114x8 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 |
| BQ3285S-SB2G4 | 功能描述:实时时钟 RTC IC with 114x8 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 |
| BQ3285S-SB2TR | 功能描述:实时时钟 RTC IC with 114x8 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 |
| BQ3285S-SB2TRG4 | 功能描述:实时时钟 RTC IC with 114x8 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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