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參數(shù)資料
| 型號(hào)： | ISL5729/2INZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 10BIT CMOS DUAL 48LQFP |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 位數(shù)： | 10 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 模擬和數(shù)字 |
| 功率耗散（最大）： | 274mW |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-TQFP（7x7） |
| 包裝： | 托盤 |
| 輸出數(shù)目和類型： | * |
| 采樣率（每秒）： | 210M |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FT3001 Rev. 1.0.4
7
FT3001
—
Reset
Timer
with
Configurable
Delay
Functional Description
The reset timer uses an internal oscillator and a two-
stage 21-bit counter to determine when the output pins
switch. The time, n, is set by the hard-wired logic level
of the DSR0 and DSR1 pins. See Table 1 & 2.
Table 1.
FT3001UMX Truth Table
DSR0
DSR1
Reset Time (
20%)
in Seconds
0
3.00
0
1
3.75
1
0
4.50
1
6.00
Table 2.
FT3001MPX Truth Table
DSR0
Reset Time (
20%)
in Seconds
0
3.0
1
4.5
The two CMOS input pins, /SR0 and /SR1, control the
reset function. A low input signal on both /SR0 and /SR1
starts the oscillator. Both /SR0 and /SR1 pins must be
held LOW for time n before the /RST1 and RST2
outputs are activated. The TRIG pin should be tied LOW
during normal operation. The TRIG pin is used for
SCAN testing.
Application Information
IMPORTANT
: The DSR0 and DSR1 pins must be tied
directly to VCC or GND to provide a HIGH or LOW
voltage level. The voltage level on the DSR pin
determines the length of the configurable delay. The
voltage level on the DSR pins must not change during
normal operation. Do not use pull-up or pull-down
resistors on DSR pins.
Short Duration (Button Press Time < n)
In this case, both input /SR0 and /SR1 are LOW for a
duration (tW) that is shorter than time n. When an input
goes LOW, the internal timer starts counting. If the input
goes HIGH before time n, the timer stops counting and
resets and no changes occur on the outputs.
Long Duration (tW > n)
In this case, both input /SR0 and /SR1 are LOW for a
duration (tW) that is longer than time n. When an input
goes LOW, the internal timer starts counting.
After time n, the outputs switch and the timer stops
counting. After time tREC, the outputs return to their
original states.
Table 3.
Short Duration
/SR0
/SR1
/RST1
RST2
Description
L
H
L
The timer starts counting when both inputs go LOW. The timer stops
counting and resets when either input goes high. No changes occur on the
outputs. Both /SR0 and /SR1 need to be LOW to activate (start) the timer.
Figure 8. Short Duration
Figure 9. Long Duration
Table 4.
Long Duration
/SR0
/SR1
/RST1
RST2
Description
L
The timer starts counting when both inputs go LOW. After time n, the
outputs switch. After time tREC, the outputs return to their original states.
Both /SR0 and /SR1 need to be LOW to activate (start) the timer.
L
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