- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1995 > FT7521L6X (Fairchild Semiconductor)IC RESET TIMER 7.5SEC 6MICROPAK PDF資料下載
參數(shù)資料
| 型號： | FT7521L6X |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RESET TIMER 7.5SEC 6MICROPAK |
| 標準包裝： | 5,000 |
| 類型： | 可編程計時器 |
| 電源電壓： | 2 V ~ 5 V |
| 電流 - 電源： | 200µA |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 6-UFDFN |
| 包裝： | 帶卷 (TR) |
| 供應商設備封裝： | 6-MicroPak |
| 安裝類型： | 表面貼裝 |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FT7521
Rev. 1.0.8
5
FT7521
—
Re
set
Ti
mer
with
Fi
x
ed
De
lay
and
Rese
t
Pulse
Functional Description
Default operation time N is 7.5 s. If the DSR pin is pulled
HIGH prior to VCC ramp, the FT7521 enters Test Mode
and the reset output, /RST1, is immediately pulled LOW
for factory testing. The DSR pin MUST be forced to
GND during normal operation. The DSR pin should
never be driven HIGH or left to FLOAT during normal
operation. The DSR PIN state should never be changed
during device operation; it must be biased prior to
supplying the VCC supply. If there is a need to use the
DSR=VCC Test Mode, the /SR0 must be HIGH when
the DSR pin is moved from LOW to HIGH to enter Zero-
Second Factory-Test Mode. To return to the standard
7.5-second reset time, the same procedure must be
followed with DSR=GND. The DSR pin should never be
allowed to change state while the /SR0 pin is LOW. The
VCC supply pin should never be left to float while other
input pins are driven. If the VCC pin is allowed to float,
care should be taken to ensure that /SR0 is not driven to
any voltage greater than GND.
Operation Modes
A low input signal on /SR0 starts the oscillator. There
are two scenarios for counting: short duration and long
duration. In the short-duration scenario, output /RST1 is
not affected. In the long-duration scenario, the output
/RST1 goes LOW after /SR0 has been held LOW for
7.5 s. The /RST1 output returns to its original HIGH
state 400ms after time tREC has expired, regardless of
the state of /SR0. The /RST1 output is an open-drain
driver. When the count time exceeds time 7.5 s, the
/RST1 output pulls LOW.
Short Duration (tW < 7.5 s)
When the /SR0 input goes LOW, the internal timer starts
counting. If the /SR0 input goes HIGH before 7.5 s has
elapsed, the timer stops counting and resets and no
changes occur on the outputs.
Long Duration (tW > 7.5 s)
When the /SR0 input goes LOW, the internal timer starts
counting. If the /SR0 input stays LOW for at least 7.5 s, the
RST output is enabled and pulled LOW. The output RST
is held LOW for tREC, 400 ms, as soon as the reset time
of 7.5 s is met, regardless of the state of the /SR0 pin.
When the /SR0 input has returned HIGH and the tREC
has expired, the internal timer resets and awaits the
next RESET event.
Zero-Second Test Mode
/RST1 goes LOW immediately after /SR0 goes LOW.
N=7.5s
tREC=400ms
Short-Duration,
Normal Operation
/RST1 never goes LOW because
/SR0 LOW duration does not meet
requirement: Reset Time N=7.5s
Long-Duration,
Normal Operation
/RST1 goes LOW because
/SR0 LOW duration exceeded
requirement: Reset Time N=7.5s
Zero-Second Factory-Test Mode
/RST1 goes LOW immediately
after /SR0 goes LOW
/SR0
RST1
/SR0
RST1
/SR0
RST1
Figure 4.
Reset Timing Waveforms
相關PDF資料 |
PDF描述 |
|---|---|
| FT7522L6X | IC RESET TIMER 6-MICROPAK |
| FT8010UMX | IC RESET TIMER CONF DELAY 10UMLP |
| FTS125-COO-010.0M | IC GPS BASED TIMING MOD (OCXO) |
| FTS125-CTV-010.0M | IC GPS BASED TIMING MOD (TCXO) |
| FTS250-010.0M | IC GPS BASED TIMING MOD (TCXO) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FT7522 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Reset Timer with Fixed Delay and Reset Pulse |
| FT7522L6X | 功能描述:計時器和支持產(chǎn)品 ResetTimer w/ Delay RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| FT-7600 | 制造商:GC Electronics 功能描述: 制造商:Winchester Electronics 功能描述: |
| FT762-03004-043 | 制造商:Japan Aviation Electronics (JAE) 功能描述: |
| FT762-03004-055 | 制造商:Japan Aviation Electronics (JAE) 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。