74HCT4538
Dual retriggerable precision monostable multivibrator
The 74HCT4538 is a dual retriggerable?-?resettable monostable multivibrator. Each multivibrator has two trigger?/?retrigger inputs (nA and nB), a direct reset input (nCD), two complementary outputs (nQ and nQ), and two pins (nREXT/CEXT and nCEXT) for connecting the external timing components CEXT and REXT. Typical pulse width variation over temperature range is ± 0.2 %. The device may be triggered by either the positive or the negative edges of the input pulse. The duration and accuracy of the output pulse are determined by the external timing components CEXT and REXT. The output pulse width (TW) is equal to 0.7 × REXT × CEXT. The linear design techniques guarantee precise control of the output pulse width. A LOW level at nCD terminates the output pulse immediately. Schmitt?-?trigger action in the trigger inputs makes the circuit highly tolerant to slower rise and fall times. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
Features and benefits
Tolerant of slow trigger rise and fall times
High noise immunity
Separate reset inputs
Triggering from falling or rising edge
Complies with JEDEC standard no. 7A
Wide supply voltage range from 4.5 to 5.5 V
CMOS low power dissipation
TTL input levels
Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
ESD protection:
HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
參數(shù)類型
| 型號(hào) | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HCT4538D | 4.5?-?5.5 | TTL | ± 4 | 30 | low | -40~125 | 74 | 1.7 | 32.8 | SO16 |
| 74HCT4538PW | 4.5?-?5.5 | TTL | ± 4 | 30 | low | -40~125 | 109 | 1 | 37 | TSSOP16 |
封裝
| 型號(hào) | 可訂購(gòu)的器件編號(hào)，（訂購(gòu)碼(12NC)） | 狀態(tài) | 標(biāo)示 | 封裝 | 外形圖 | 回流焊/波峰焊 | 包裝 |
|---|---|---|---|---|---|---|---|
| 74HCT4538D | 74HCT4538D,118 (933715390118) |
Active | 74HCT4538D |
SO16 (SOT109-1) |
SOT109-1 |
SO-SOJ-REFLOW
SO-SOJ-WAVE WAVE_BG-BD-1 |
SOT109-1_118 |
| 74HCT4538PW | 74HCT4538PW,118 (935189140118) |
Active | HCT4538 |
TSSOP16 (SOT403-1) |
SOT403-1 |
SSOP-TSSOP-VSO-WAVE
|
SOT403-1_118 |
下表中的所有產(chǎn)品型號(hào)均已停產(chǎn) 。
| 型號(hào) | 可訂購(gòu)的器件編號(hào)，（訂購(gòu)碼(12NC)） | 狀態(tài) | 標(biāo)示 | 封裝 | 外形圖 | 回流焊/波峰焊 | 包裝 |
|---|---|---|---|---|---|---|---|
| 74HCT4538DB | 74HCT4538DB,112 (935188780112) |
Obsolete | no package information | ||||
| 74HCT4538DB,118 (935188780118) |
Obsolete | ||||||
環(huán)境信息
| 型號(hào) | 可訂購(gòu)的器件編號(hào) | 化學(xué)成分 | RoHS | RHF指示符 |
|---|---|---|---|---|
| 74HCT4538D | 74HCT4538D,118 | 74HCT4538D |
|
|
| 74HCT4538PW | 74HCT4538PW,118 | 74HCT4538PW |
|
|
下表中的所有產(chǎn)品型號(hào)均已停產(chǎn) 。
| 型號(hào) | 可訂購(gòu)的器件編號(hào) | 化學(xué)成分 | RoHS | RHF指示符 |
|---|---|---|---|---|
| 74HCT4538DB | 74HCT4538DB,112 | 74HCT4538DB |
|
|
| 74HCT4538DB | 74HCT4538DB,118 | 74HCT4538DB |
|
|
文檔 (13)
| 文件名稱 | 標(biāo)題 | 類型 | 日期 |
|---|---|---|---|
| 74HCT4538 | Dual retriggerable precision monostable multivibrator | Data sheet | 2024-03-26 |
| AN90063 | Questions about package outline drawings | Application note | 2025-10-22 |
| SOT109-1 | 3D model for products with SOT109-1 package | Design support | 2020-01-22 |
| SOT403-1 | 3D model for products with SOT403-1 package | Design support | 2020-01-22 |
| Nexperia_package_poster | Nexperia package poster | Leaflet | 2020-05-15 |
| SO16_SOT109-1_mk | plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm body | Marcom graphics | 2017-01-28 |
| TSSOP16_SOT403-1_mk | plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body | Marcom graphics | 2017-01-28 |
| SOT109-1 | plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body | Package information | 2023-11-07 |
| SOT403-1 | plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm body | Package information | 2023-11-08 |
| SO-SOJ-REFLOW | Footprint for reflow soldering | Reflow soldering | 2009-10-08 |
| SO-SOJ-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
| WAVE_BG-BD-1 | Wave soldering profile | Wave soldering | 2021-09-08 |
| SSOP-TSSOP-VSO-WAVE | Footprint for wave soldering | Wave soldering | 2009-10-08 |
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