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參數(shù)資料
| 型號： | BQ4845S |
| 英文描述： | Fast Recovery Glass Passivated Rectifier Diodes |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 1155K |
| 代理商： | BQ4845S |
16
Power-Down/Power-Up Timing
(TA= TOPR)
Symbol
t
F
Parameter
Minimum
300
Typical
-
Maximum
-
Unit
μ
s
Conditions
V
CC
slew from 4.75 to
4.25V
V
CC
slew from 4.25 to V
SO
V
CC
slew from V
SO
to
V
PFD(MAX)
Interrupt delay from
V
PFD
t
FS
10
-
-
μ
s
t
R
100
-
-
μ
s
t
PF
6
-
24
μ
s
t
WPT
Write-protect timefor
external RAM
90
100
125
μ
s
Delay after V
CC
slews down past
V
PFD
beforeSRAM is write-protected
and RST activated.
Internal write-protection period af-
ter V
CC
passes V
PFD
on power-up.
Reset active time-out period
Time during which external SRAM
is write-protected after V
CC
passes
V
PFD
on power-up.
t
CSR
CS at V
IH
after power-up
100
200
300
ms
t
RST
V
PFD
to RST inactive
t
CSR
-
t
CSR
ms
t
CER
Chip enable recovery
time
Chip enable propagation
delay to external SRAM
t
CSR
-
t
CSR
ms
t
CED
-
9
12
ns
Output load A
Caution:
Negative undershoots below the absolute maximum rating of -0.3V in battery-backup mode
may affect data integrity.
Aug. 1995
Power-Down/Power-Up Timing
Notes:
PWRIE set to “1” to enable power fail interrupt.
RST and INT are open drain and require an external pull-up resistor.
bq4845/bq4845Y
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4845S- | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Parallel RTC With CPU Supervisor |
| BQ4845S-A4 | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer 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 |
| BQ4845S-A4G4 | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer 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 |
| BQ4845S-A4N | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer 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 |
| BQ4845S-A4NG4 | 功能描述:實時時鐘 w/NVSRAM Control Watchdog Timer 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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