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參數(shù)資料
| 型號(hào)： | BQ4845P-A4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | XO, clock |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 封裝： | 0.600 INCH, ROHS COMPLIANT, PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 18/24頁(yè) |
| 文件大?。?/td> | 1287K |
| 代理商： | BQ4845P-A4 |
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Pin Descriptions
X1–X2
Crystal inputs
X1–X2
are
a
direct
connection
for
a
32.768kHZ, 6pF crystal.
RST
Reset output
RST goes low whenever VCC falls below the
power fail threshold. RST will remain low for
200ms typical after VCC crosses the threshold
on power-up. RST also goes low whenever a
watchdog timeout occurs.
RST is an open-
drain output.
INT
Interrupt output
INT goes low when a power fail, periodic, or
alarm condition occurs. INT is an open-drain
output.
WDI
Watchdog input
WDI is a three-level input. If WDI remains
either high or low for longer than the
watchdog time-out period (1.5 seconds de-
fault), WDO goes low. WDO remains low
until the next transition at WDI. Leaving
WDI unconnected disables the watchdog
function. WDI connects to an internal volt-
age divider between VOUT and VSS, which
sets it to mid-supply when left uncon-
nected.
WDO
Watchdog output
WDO goes low if WDI remains either high
or low longer than the watchdog time-out
period. WDO returns high on the next tran-
sition at WDI. WDO remains high if WDI is
unconnected.
A0–A3
Clock address inputs
A0–A3 allow access to the 16 bytes of real-
time clock and control registers.
DQ0–DQ7 Data input and output
DQ0–DQ7 provide x8 data for real-time clock
information. These pins connect to the mem-
ory data bus.
VSS
Ground
CS
Chip select
OE
Output enable
OE provides the read control for the RTC
memory locations.
CEOUT
Chip enable output
CEOUT goes low only when CEIN is low and
VCC is above the power fail threshold. If
CEIN is low, and power fail occurs, CEOUT
stays low for 100
s or until CEIN goes high,
whichever occurs first.
CEIN
Chip enable input
CEIN is the input to the chip-enable gating
circuit.
BC
Backup battery input
BC should be connected to a 3V backup
cell. A voltage within the VBC range on the
BC pin should be present upon power up to
provide proper oscillator start-up.
VOUT
Output supply voltage
VOUT provides the higher of VCC or VBC,
switched internally, to supply external
RAM.
WE
Write enable
WE provides the write control for the RTC
memory locations.
VCC
Input supply voltage
+5V input
3
Aug. 1995
bq4845/bq4845Y
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BQ4845P-N | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Parallel RTC With CPU Supervisor |
| BQ4845S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| 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(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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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