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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)： | 12/27頁 |
| 文件大?。?/td> | 170K |
| 代理商： | BQ3285LDSSTRG4 |
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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 bq3285ED/LD 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
bq3285ED/LD 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 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 sys-
tem.
2
bq3285ED/LD
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
BD328501.eps
P
Bus
I/F
Power-
Fail
Control
Storage Registers
(114 Bytes)
User Buffer
(14 Bytes)
VOUT
Clock/Calendar, Alarm
and Control Bytes
Time-
Base
Oscillator
Control/Status
Registers
÷ 8
÷ 64
16 1 MUX
:
Interupt
Generator
Control/Calendar
Update
VCC
DS
AD0–AD7
CS
MOT
32K
INT
X1
X2
3
4
RST
R/W
AS
Storage Registers
(128 Bytes)
RCL
EXTRAM
Write
Protect
CS
BC
32K
Driver
July 1997
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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