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參數(shù)資料
| 型號(hào)： | ZN427E-8 |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| 中文描述： | 250 的低電流運(yùn)算，低反向泄露，低噪聲穩(wěn)壓二極管 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大小： | 311K |
| 代理商： | ZN427E-8 |
ZN427
6
N1 is connected as an astable multivibrator which, when the
BUSY
output is high, is inhibited by the output of N2 holding
one of its inputs low. The start conversion pulse resets the
BUSY
flag and N1 begins to oscillate. When the conversion
is complete
BUSY
goes high and the clock is inhibited.
Since the start pulse starts the clock it may occur at any time.
The only constraints on the start pulse are that it must be
longer than 250ns but at least 200ns shorter than the first clock
pulse. The first clock pulse is in fact longer than the rest since
C1 starts from a fully charged condition whereas on
subsequent cycles it changes between the upper and lower
threshold (V
T+
and V
T
) of the Schmitt trigger.
LOGIC INPUTS AND OUTPUTS
The logic inputs of the ZN427 utilise the emitter-follower
configuration shown in Fig.6. This gives extremely low input
currents for CMOS as well as TTL compatibility.
Fig.6 Equivalent circuit of all inputs
Fig.7
The data outputs have three-state buffers, an equivalent
circuit of which is shown in Fig.8. Whilst the RD input is low
both output transistors are turned off and the output is in a high
The
BUSY
output, shown in Fig.7, utilises a passive pullup for CMOS/TTL compatibility.
impedance state. When RD is high the data output will
assume the appropriate logic state (0 or 1).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZN427E8DP | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN427J-8 | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN427J8DC | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
| ZN427J8 | Circular Connector; MIL SPEC:MIL-DTL-38999 Series III; Body Material:Metal; Series:TVPS00; No. of Contacts:4; Connector Shell Size:21; Connecting Termination:Crimp; Circular Shell Style:Wall Mount Receptacle; Body Style:Straight |
| ZN428 | 8-BIT LATCHED INPUT D-A CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZN427E8DP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ZN427J8 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:MICROPROCESSOR COMPATIBLE 8-BIT SUCCESSIVE APPROXIMATION A-D CONVERTER |
| ZN427J-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ZN427J8DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 8-Bit |
| ZN428 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT LATCHED INPUT D-A CONVERTER |
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