74HC14中文资料
CD74HC14E中文资料
[ /Title (CD74H C14, CD74H CT14) /Subject (High Speed CMOS Logic Hex Invert-
Features
Description
• Unlimited Input Rise and Fall Times
• Exceptionally High Noise Immunity
NOTE: 1. The package thermal impedance is calculated in accordance with JESD 51-7.
DC Electrical Specifications
TEST CONDITIONS
PARAMETER HC TYPES
SYMBOL VI (V) IO (mA) VCC (V)
(SOIC - Lead Tips Only)
Operating Conditions
Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC Supply Voltage Range, VCC
HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V
0.3
1.0
0.9
2.2
1.2
3.0
0.2
1.0
0.4
1.4
0.6
1.6
1.9
-
4.4
-
5.9
-
-
-
3.98
-
5.48
解析74HC14的原理及极限参数
解析74HC14的原理及极限参数
什幺是74HC14
关于74HC14，它的定义是一个高速度的CMOS器件，特点是能对TTL 器件引脚的完美兼容，74HC14集成电路内部封装了六个相同的带施密特功能的反相器，起整形的作用，专门用于对输入信号中非陡峭的上升沿和下降沿变的陡峭。
它的输入信号可以是不规则变化的模拟信号或者数字信号。
74HC14的原理
当74HC14集成电路输入端连接的RC网络R205、C116组成积分电路，R248是积分电容C116的放电回路的泄放电阻，同时也是74HC14集成电路输入端下拉电阻，非常重要不可以取消不用，R205、C116组成的RC积分电路完成对输入缓慢上升变化的模拟信号或者数字信号做第一步积分整形，再通过二级反相器做二次施密特开关整形，使低于74HC14阀值电平以下的输入信号电平不能通过二级施密特反相器，使高于74HC14阀值电平以上的输入信号电平通过二级施密特反相器整形输出，二级施密特反相器保证输出的信号与输入到积分电路的信号同相。
极限参数：。
74HC14中文资料
74HC14引脚图:
图1 引脚功能
74HC14真值表:
74HC14电气参数:
极限参数：
Switching Characteristics开关特性 at VCC = 5V and TA = 25℃
采用施密特触发器74HC14的光耦接收整形电路:
图2 光电耦合器接收整形电路
采用施密特触发器74HC14的方波振荡器电路
图3 方波振荡器
施密特触发器.主要用要将上下沿较缓或奇变较大的的数字信号变为方波形式以利数字信号接收电路识别.比如一串高频数字信号方波经过一个并普通光耦后波形可能奇变的后级不能识别,加一个74HC14进行整形
编辑本段74HC14概述：
74HC14是一款高速CMOS器件，74HC14引脚兼容低功耗肖特基TTL （LSTTL）系列。
74HC14遵循JEDEC标准。
74HC14实现了6路施密特触发反相器，可将缓慢变化的输入信号转换成清晰、无抖动的输出信号。
编辑本段特性：
应用：波形、脉冲整形器
非稳态多谐振荡器
单稳多谐振荡器
兼容JEDEC标准
ESD保护：
HBM EIA/JESD22-A114-A超过2000 V
MM EIA/JESD22-A115-A超过200 V
温度范围 -40～+85 ℃ -40～+125 ℃
编辑本段主要参数：
典型电源电压：
正向输入阀值电压：VT+=
负向输入阀值电压：VT-=
驱动电流： +/
传输延迟：12ns @5V
逻辑电平：CMOS
引脚：14
封装类型：DIP。
74HC14D中文资料_数据手册_参数
supply voltage input voltage output voltage ambient temperature
74HC14
Min Typ Max
2.0 5.0 6.0
0
-
VCC
0
-
VCC
40 +25 +125
74HCT14
Unit
Min Typ Max
4.5 5.0 5.5 V
0
-
VCC V
2. Features and benefits
Complies with JEDEC standard no. 7A Low-power dissipation ESD protection:
HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V Multiple package options Specified from 40 C to +85 C and from 40 C to +125 C
4 of 20
NXP Semiconductors
74HC14; 74HCT14
Hex inverting Schmitt trigger
10. Static characteristics
Table 6. Static characteristics At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
9. Recommended operating conditions
Table 5. Recommended operating conditions Voltages are referenced to GND (ground = 0 V)
详细施密特触发器74HC14的中文资料
详细施密特触发器74HC14的中文资料74HC14为一个六反相施密特触发器真值表：Y=AInput输入output输出AYLHHL74HC14的引脚图如下，其中Vcc（14脚）是电源正电压引脚，GND（7脚）是电源地引脚，一片74HC14上共有6个反相器通道，第1、3、5、9、11、13脚分别是通道1、2、3、4、5、6的输入脚，2、4、6、8、10、12脚分别是通道1、2、3、4、5、6的输入出脚。
建议操作条件符号参数最小典型最大单位电源电压为 4.7555.25VVT，正向输入阈值电压为1.41.61.9VVT，反向输入阈值电压为0.50.81VHYS，输入滞后0.40.8-VIOHHIGH 高电平输出电流---0.4mAIOLLOW，低电平输出电流--8mATAFree ，工作温度0-70℃Note 2：VCC = 5V.电气特性超过推荐的工作自由空气温度范围（除非另有说明），符号参数条件最小典型最大单位输入钳位电压VCC 为最小，II = -18mA---1.5VVOHHIGH输出高电平电压VCC 为最小，IOH为最大VIL=最大2.73.4-VVOLLOW Level输出低电平电压VCC = 最小，IOL = 最大-0.350.5--Output V oltage输出电压VIH = 最小---VVCC = 最小，IOL = 4mA-0.250.4IT，正向阈值输入电流VCC = 5V，VI = VT+--0.14-mAIT，反向阈值输入电流VCC = 5V，VI = VT---0.18-mAII，输入电流@最大输入电压VCC = 最大，VI = 7V--0.1mAIIHHIGH ，输入高电平电流VCC = 最大，VI = 2.7V--20μAIILLOW ，输入低电平电流VCC = 最大，VI = 0.4V---0.4mAIOSShort ，短路输出电流VCC = 最大（Note 4）-20--100mAICCH，电平输出电源电流VCC = 最大-8.616mAICCL，低电平输出电源电流VCC = 最大-1221mANote 3：VCC = 5V，TA = 25℃.Note 4：一次不应超过一个输出，持续时间不应超过一秒。
HD74HC14FPEL中文资料
HD74HC14Hex InvertersREJ03D0540-0200(Previous ADE-205-412)Rev.2.00Oct 06, 2005 Features• High Speed Operation: t pd = 10.5 ns typ (C L = 50 pF)• High Output Current: Fanout of 10 LSTTL Loads• Wide Operating Voltage: V CC = 2 to 6 V• Low Input Current: 1 µA max• Low Quiescent Supply Current: I CC (static) = 1 µA max (Ta = 25°C)• Ordering InformationPart Name Package TypePackage Code(Previous Code)PackageAbbreviationTaping Abbreviation(Quantity)HD74HC14P DILP-14pin PRDP0014AB-B(DP-14AV)P —HD74HC14FPEL SOP-14 pin (JEITA) PRSP0014DF-B(FP-14DAV)FP EL (2,000 pcs/reel)HD74HC14RPEL SOP-14 pin (JEDEC) PRSP0014DE-A(FP-14DNV)RP EL (2,500 pcs/reel)HD74HC14TELL TSSOP-14pin PTSP0014JA-B(TTP-14DV)T ELL(2,000pcs/reel)Note: Please consult the sales office for the above package availability.Function TableInput OutputA YL HH L H : High levelL : Low levelPin ArrangementAbsolute Maximum RatingsItem Symbol Ratings UnitSupply voltage range V CC –0.5 to 7.0 V Input / Output voltage Vin, Vout –0.5 to V CC +0.5VInput / Output diode current I IK , I OK ±20 mAOutput current I O±25 mAV CC , GND current I CC or I GND ±50 mAPower dissipationP T 500 mWStorage temperature Tstg –65 to +150 °CNote: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two ofwhich may be realized at the same time.Recommended Operating ConditionsItem Symbol Ratings Unit ConditionsSupply voltage V CC 2 to 6 V Input / Output voltage V IN , V OUT 0 to V CC V Operating temperature Ta –40 to 85 °C 0 to unlimited V CC = 2.0 V 0 to unlimitedV CC = 4.5 V Input rise / fall time *1t r , t f0 to unlimitednsV CC = 6.0 VNote: 1. This item guarantees maximum limit when one input switches. Waveform: Refer to test circuit of switching characteristics.Electrical CharacteristicsTa = 25°CTa = –40 to+85°CItem Symbol V CC (V) Min Typ Max Min Max UnitTest Conditions2.0 — — 1.5 — 1.5 4.5 — —3.15 — 3.15V T +6.0 — — 4.2 — 4.2V2.0 0.3 — — 0.3 — 4.5 0.9 — — 0.9 — Threshold voltage V T -6.0 1.2 — — 1.2 —V 2.0 0.2 — 1.2 0.2 1.2 4.5 0.4 — 2.25 0.4 2.25 Hysteresis voltage V H6.0 0.6 — 3.0 0.6 3.0V 2.0 1.9 2.0 — 1.9 — 4.5 4.4 4.5 — 4.4 — 6.0 5.9 6.0 — 5.9 — I OH = –20 µA 4.5 4.18 — — 4.13 —I OH = –4 mAV OH6.0 5.68 — — 5.63 — V Vin = V IH or V IL I OH = –5.2 mA 2.0 — 0.0 0.1 — 0.1 4.5 — 0.0 0.1 — 0.1 6.0 — 0.0 0.1 — 0.1 I OL = 20 µA 4.5 — — 0.26 — 0.33 I OL = 4 mAOutput voltage V OL6.0 — — 0.26 — 0.33V Vin = V IH or V IL I OL = 5.2 mAInput currentIin 6.0 — — ±0.1 — ±1.0 µA Vin = V CC or GND Quiescent supply current I CC 6.0 — — 1.0 — 10 µA Vin = V CC or GND, Iout = 0 µASwitching Characteristics (C L = 50 pF, Input t r = t f = 6 ns)Ta = 25°C Ta = –40 to +85°CItem Symbol V CC (V) Min Typ Max Min Max UnitTest Conditions2.0 — — 125 — 155 4.5 — 10 25 — 31 t PLH6.0 — — 21 — 26 ns 2.0 — — 125 — 155 4.5 — 11 25 — 31 Propagation delaytimet PHL6.0 — — 21 — 26ns 2.0 — — 75 — 95 4.5 — 5 15 — 19 Output rise timet TLH6.0 — — 13 — 16ns 2.0 — — 75 — 95 4.5 — 5 15 — 19 Output fall time t THL6.0 — — 13 — 16ns Input capacitance Cin——510—10pFTest CircuitWaveformsPackage Dimensions RENESAS SALES OFFICESRefer to "/en/network" for the latest and detailed information.Renesas Technology America, Inc.450 Holger Way, San Jose, CA 95134-1368, U.S.ATel: <1> (408) 382-7500, Fax: <1> (408) 382-7501Renesas Technology Europe LimitedDukes Meadow, Millboard Road, Bourne End, Buckinghamshire, SL8 5FH, U.K.Tel: <44> (1628) 585-100, Fax: <44> (1628) 585-900Renesas Technology Hong Kong Ltd.7th Floor, North Tower, World Finance Centre, Harbour City, 1 Canton Road, Tsimshatsui, Kowloon, Hong KongTel: <852> 2265-6688, Fax: <852> 2730-6071Renesas Technology Taiwan Co., Ltd.10th Floor, No.99, Fushing North Road, Taipei, TaiwanTel: <886> (2) 2715-2888, Fax: <886> (2) 2713-2999Renesas Technology (Shanghai) Co., Ltd.Unit2607 Ruijing Building, No.205 Maoming Road (S), Shanghai 200020, ChinaTel: <86> (21) 6472-1001, Fax: <86> (21) 6415-2952Renesas Technology Singapore Pte. Ltd.1 Harbour Front Avenue, #06-10, Keppel Bay Tower, Singapore 098632Tel: <65> 6213-0200, Fax: <65> 6278-8001Renesas Technology Korea Co., Ltd.Kukje Center Bldg. 18th Fl., 191, 2-ka, Hangang-ro, Yongsan-ku, Seoul 140-702, KoreaTel: <82> 2-796-3115, Fax: <82> 2-796-2145Renesas Technology Malaysia Sdn. Bhd.Unit 906, Block B, Menara Amcorp, Amcorp Trade Centre, No.18, Jalan Persiaran Barat, 46050 Petaling Jaya, Selangor Darul Ehsan, MalaysiaTel: <603> 7955-9390, Fax: <603> 7955-9510。
74VHC14中文资料
1/11November 2004s HIGH SPEED: t PD = 5.5ns (TYP.) at V CC = 5V sLOW POWER DISSIPATION:I CC = 2 µA (MAX.) at T A =25°C sTYPICAL HYSTERESIS: V h = 1V at V CC = 4.5Vs POWER DOWN PROTECTION ON INPUTS sSYMMETRICAL OUTPUT IMPEDANCE:|I OH | = I OL = 8 mA (MIN)sBALANCED PROPAGATION DELAYS:t PLH ≅ t PHLsOPERATING VOLTAGE RANGE:V CC (OPR) = 2V to 5.5VsPIN AND FUNCTION COMPATIBLE WITH 74 SERIES 14s IMPROVED LATCH-UP IMMUNITY sLOW NOISE: V OLP = 0.8V (MAX.)DESCRIPTIONThe 74VHC14 is an advanced high-speed CMOS HEX SCHMITT INVERTER fabricated with sub-micron silicon gate and double-layer metal wiring C 2MOS technology.The internal circuit is composed of 3 stages including buffer output, which enables high noise immunity and stable output.Power down protection is provided on all inputs and 0 to 7V can be accepted on inputs with noregard to the supply voltage. This device can be used to interface 5V to 3V.Pin configuration and function are the same as those of the 74VHC04 but the 74VHC14 has hysteresis.This together with its schmitt trigger function allows it to be used on line receivers with slow rise/fall input signals.All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.74VHC14HEX SCHMITT INVERTERFigure 1: Pin Connection And IEC Logic SymbolsTable 1: Order CodesPACKAGE T & R SOP 74VHC14MTR TSSOP74VHC14TTR74VHC142/11Figure 2: Input Equivalent CircuitTable 2: Pin DescriptionTable 3: Truth TableTable 4: Absolute Maximum RatingsAbsolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions isnot impliedTable 5: Recommended Operating ConditionsPIN N°SYMBOL NAME AND FUNCTION 1, 3, 5, 9, 11,131A to 6A Data Inputs 2, 4, 6, 8, 10,121Y to 6Y Data Outputs 7GND Ground (0V)14V CCPositive Supply VoltageA Y L H HLSymbol ParameterValue Unit V CC Supply Voltage -0.5 to +7.0V V I DC Input Voltage -0.5 to +7.0V V O DC Output Voltage -0.5 to V CC + 0.5V I IK DC Input Diode Current - 20mA I OK DC Output Diode Current ± 20mA I ODC Output Current± 25mA I CC or I GND DC V CC or Ground Current± 50mA T stgStorage Temperature -65 to +150°C T LLead Temperature (10 sec)300°CSymbol ParameterValue Unit V CC Supply Voltage 2 to 5.5V V I Input Voltage 0 to 5.5V V O Output Voltage 0 to V CC V T opOperating Temperature-55 to 125°C74VHC143/11Table 6: DC SpecificationsTable 7: AC Electrical Characteristics (Input t r = t f = 3ns)(*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5VSymbolParameterTest ConditionValue UnitV CC (V)T A = 25°C -40 to 85°C -55 to 125°C Min.Typ.Max.Min.Max.Min.Max.V t+High LevelThreshold Voltage 3.0 2.2 2.2 2.2V 4.5 3.15 3.15 3.155.5 3.853.853.85V t-Low LevelThreshold Voltage 3.00.90.90.9V4.5 1.35 1.35 1.355.5 1.65 1.65 1.65V hHysteresis Voltage3.00.3 1.20.3 1.20.3 1.2V4.50.4 1.40.4 1.40.4 1.45.50.5 1.60.5 1.60.5 1.6V OHHigh Level Output Voltage2.0I O =-50 µA 1.9 2.0 1.9 1.9V3.0I O =-50 µA 2.9 3.0 2.9 2.94.5I O =-50 µA 4.4 4.5 4.4 4.43.0I O =-4 mA 2.58 2.48 2.44.5I O =-8 mA 3.943.83.7V OLLow Level Output Voltage2.0I O =50 µA 0.00.10.10.1V3.0I O =50 µA 0.00.10.10.14.5I O =50 µA 0.00.10.10.13.0I O =4 mA 0.360.440.554.5I O =8 mA 0.360.440.55I I Input Leakage Current0 to 5.5V I = 5.5V or GND ± 0.1± 1± 1µA I CCQuiescent Supply Current5.5V I = V CC or GND22020µA SymbolParameterTest ConditionValueUnitV CC (V)C L (pF)T A = 25°C -40 to 85°C -55 to 125°C Min.Typ.Max.Min.Max.Min.Max.t PLH t PHLPropagation Delay Time3.3(*)158.312.8 1.015.0 1.015.0ns 3.3(*)5010.816.3 1.018.5 1.018.55.0(**)15 5.58.6 1.010.0 1.010.05.0(**)507.010.61.012.01.012.074VHC144/11Table 8: Capacitive Characteristics1) C PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I CC(opr) = C PD x V CC x f IN + I CC /6 (per gate)Table 9: Dynamic Switching Characteristics1) Worst case package.2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND.3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (V ILD ), 0V to threshold (V IHD ), f=1MHz.Figure 3: Test CircuitC L =15/50pF or equivalent (includes jig and probe capacitance)R T = Z OUT of pulse generator (typically 50Ω)SymbolParameterTest ConditionValue UnitT A = 25°C -40 to 85°C -55 to 125°C Min.Typ.Max.Min.Max.Min.Max.C IN Input Capacitance 6101010pF C PDPower Dissipation Capacitance (note 1)14pF SymbolParameterTest ConditionValue UnitV CC (V)T A = 25°C -40 to 85°C -55 to 125°C Min.Typ.Max.Min.Max.Min.Max.V OLP Dynamic Low Voltage Quiet Output (note 1, 2) 5.0CL = 50 pF0.30.8V V OLV -0.8-0.3V IHD Dynamic High Voltage Input (note 1, 3) 5.0 3.5VV ILDDynamic Low Voltage Input (note 1, 3)5.0 1.5V74VHC14 Figure 4: WAVEFORM: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)5/1174VHC146/11DIM.mm.inchMIN.TYP MAX.MIN.TYP.MAX.A 1.35 1.750.0530.069 A10.10.250.0040.010 A2 1.10 1.650.0430.065 B0.330.510.0130.020 C0.190.250.0070.010 D8.558.750.3370.344 E 3.8 4.00.1500.157 e 1.270.050H 5.8 6.20.2280.244 h0.250.500.0100.020 L0.4 1.270.0160.050 k0°8°0°8°ddd0.1000.004SO-14 MECHANICAL DATA0016019D74VHC147/11DIM.mm.inchMIN.TYPMAX.MIN.TYP.MAX.A 1.20.047A10.050.150.0020.0040.006A20.81 1.050.0310.0390.041b 0.190.300.0070.012c 0.090.200.0040.0089D 4.95 5.10.1930.1970.201E 6.2 6.4 6.60.2440.2520.260E1 4.34.4 4.480.1690.1730.176e 0.65 BSC0.0256 BSCK 0˚8˚0˚8˚L0.450.600.750.0180.0240.030TSSOP14 MECHANICAL DATAcEbA2A E1D1PIN 1 IDENTIFICATIONA1LKe0080337D74VHC14Tape & Reel SO-14 MECHANICAL DATAmm.inch DIM.MIN.TYP MAX.MIN.TYP.MAX.A33012.992 C12.813.20.5040.519 D20.20.795N60 2.362T22.40.882 Ao 6.4 6.60.2520.260 Bo99.20.3540.362 Ko 2.1 2.30.0820.090 Po 3.9 4.10.1530.161 P7.98.10.3110.3198/1174VHC14 Tape & Reel TSSOP14 MECHANICAL DATAmm.inchDIM.MIN.TYP MAX.MIN.TYP.MAX.A33012.992C12.813.20.5040.519D20.20.795N60 2.362T22.40.882Ao 6.7 6.90.2640.272Bo 5.3 5.50.2090.217Ko 1.6 1.80.0630.071Po 3.9 4.10.1530.161P7.98.10.3110.3199/1174VHC14Table 10: Revision HistoryDate Revision Description of Changes 12-Nov-20046Order Codes Revision - pag. 1.10/1174VHC14 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is grantedby implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are notauthorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.The ST logo is a registered trademark of STMicroelectronicsAll other names are the property of their respective owners© 2004 STMicroelectronics - All Rights ReservedSTMicroelectronics group of companiesAustralia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America11/11。
74ls14,74hc14六反相器
三毛电子世界
推荐工作条件:
电源电压VCC
54
74
输入正向阀值电压VIT+ 输入负向阀值电压VIT－
滞后电压ΔVt
输出高电平电流IOH 输出低电平电流 54
IOL
74
最小 4.5 4.75 1.5 0.6 0.4
5414/7414 额定 5 5 1.7
0.9
0.8
单
最小 典型 最大 最小 典型 最大 位
VIK输入嵌位电压
Vcc=最小
Iik=-12mA Iik=-18mA
-1.5
VOH输出高电平电压
Vcc ＝ 最 小 VIL ＝ VIT- 54
最小 IOH＝最大
74
2.4 2.4
VOL输出低电平电压
Vcc=最小，VIH= VIT+ 54
最大，IOL=最大
74
0.4 0.4
逻辑图
双列直插封装
极限值 电源电压 …………………………………………. 7V 输入电压 54/7414…………………………………………. 5.5V 54/74LS14 ………………………………………. 7V 工作环境温度 54XXX ……………………………………………. -55~145℃ 74XXX………… ……………………………… 0~70℃ 存储温度 …………………………………………. -65~150℃
22
‘LS14 最大 22
22
单位
ns ns
三毛电子世界
最大 5.5 5.25 2 1.1
-800 16 16
54LS14/74LS14
最小
额定
最大
4.5
5
5.5
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
74HC14的作用：六反相斯密特触发器74HC14引脚图:
图1 引脚功能
74HC14真值表:
Input输入output输出
A Y
L H
H L
74HC14电气参数:
极限参数：
Switching Characteristics开关特性at VCC = 5V and TA = 25℃
采用施密特触发器74HC14的光耦接收整形电路:
图2 光电耦合器接收整形电路
采用施密特触发器74HC14的方波振荡器电路
图3 方波振荡器
施密特触发器.主要用要将上下沿较缓或奇变较大的的数字信号变为方波形式以利数字信号接收电路识别.比如一串高频数字信号方波经过一个并普通光耦后波形可能奇变的后级不能识别,加一个74HC14进行整形
编辑本段74HC14概述：
74HC14是一款高速CMOS器件，74HC14引脚兼容低功耗肖特基TTL （LSTTL）系列。
74HC14遵循JEDEC标准no.7A。
74HC14实现了6路施密特触发反相器，可将缓慢变化的输入信号转换成清晰、无抖动的输出信号。
编辑本段特性：
应用：波形、脉冲整形器
非稳态多谐振荡器
单稳多谐振荡器
兼容JEDEC标准no.8-1A
ESD保护：
HBM EIA/JESD22-A114-A超过2000 V
MM EIA/JESD22-A115-A超过200 V
温度范围-40～+85 ℃ -40～+125 ℃
编辑本段主要参数：
典型电源电压：5.0V
正向输入阀值电压：VT+=1.6V 负向输入阀值电压：VT-=0.8V 驱动电流：+/-5.2mA
传输延迟：12ns @5V
逻辑电平：CMOS
引脚：14
封装类型：DIP。