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参数资料
| 型号： | BQ3285EQ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 12/30页 |
| 文件大小： | 1097K |
| 代理商： | BQ3285EQ |
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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 bq3285E/L 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 and EXTRAM is latched into the
bq3285E/L on the falling edge of the AS sig-
nal. During the data-transfer phase of the
bus cycle, the AD0–AD7 pins serve as a bidi-
rectional 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 and EXTRAM. This de-
multiplexing process is independent of the
CS signal. For DIP and SOIC packages with
MOT=VSS, the AS input is provided a signal
similar to ALE in an Intel-based system.
2
Apr. 1999 D
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
bq3285E/L
相关PDF资料 |
PDF描述 |
|---|---|
| BQ3285LCS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285ECS | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285LDSSTRG4 | REAL TIME CLOCK, PDSO24 |
| BQ3285LDSS | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| BQ3285EDSS | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BQ3285EQ- | 制造商:TI 制造商全称:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285EQN | 制造商:TI 制造商全称:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285ES | 功能描述:实时时钟 w/242x8 NVSRAM Alarm Wake-up 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 |
| BQ3285ES- | 制造商:TI 制造商全称:Texas Instruments 功能描述:Real-Time Clock RTC |
| BQ3285ESG4 | 功能描述:实时时钟 w/242x8 NVSRAM Alarm Wake-up 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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