74HC4538DB,118 datasheet
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74HC4538DB,118 NXP Semiconductors
NXP Semiconductors
NXP Semiconductors is a leading supplier of embedded controllers offering a broad portfolio of MCUs with Arm-based processors and microcontrollers for a variety of industries including automotive, wireless connectivity and more. They continue to drive innovation offering a strong Power Management portfolio for industrial and automotive applications, including multiple power supplies and battery management solutions. NXP products power and connect across the globe building solutions, helping enhance the proficiency of people, organizations and the world has a whole. Freescale Semiconductor has been acquired by NXP Semiconductor. Freescale Semiconductor parts are now a part of the NXP family (Dec 2015).
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• Wide supply voltage range from 2.0 to 6.0 V
• CMOS low power dissipation
• CMOS input levels
• High noise immunity
•
• Separate reset inputs
•
•
• Complies with JEDEC standardsTolerant of slow trigger rise and fall timesTriggering from falling or rising edgeLatch-up performance exceeds 100 mA per JESD 78 Class II Level B
•
•JESD8C (2.7 V to 3.6 V)JESD7A (2.0 V to 6.0 V)
• ESD protection:
• HBM JESD22-A114F exceeds 2000 V
• MM JESD22-A115-A exceeds 200 V
• Specified from -40 °C to +85 °C and from -40 °C to +125 °C
The 74HC4538 is a dual retriggerable-resettable monostable multivibrator. Each multivibrator hastwo trigger/retrigger inputs (nA and nB), a direct reset input (nCD), two complementary outputs (nQand nQ), and two pins (nREXT/CEXT and nCEXT) for connecting the external timing componentsCEXT and REXT. Typical pulse width variation over temperature range is ± 0.2 %. The devicemay be triggered by either the positive or the negative edges of the input pulse. The durationand accuracy of the output pulse are determined by the external timing components CEXT andREXT. The output pulse width (TW) is equal to 0.7 × REXT × CEXT. The linear design techniquesguarantee precise control of the output pulse width. A LOW level at nCD terminates the outputpulse immediately. Schmitt-trigger action in the trigger inputs makes the circuit highly tolerant toslower rise and fall times. Inputs include clamp diodes. This enables the use of current limitingresistors to interface inputs to voltages in excess of VCC.
Table 2. Pin descriptionSymbol1CEXT, 2CEXT1REXT/CEXT, 2REXT/CEXT1CD, 2CD1B, 2B1A, 2A1Q, 2Q1Q, 2QGNDVCCPin1, 152, 143, 134, 125, 116, 107, 9816Descriptionexternal capacitor connection (always connected to ground)external capacitor/resistor connectiondirect reset input (active LOW)input (LOW to HIGH triggered)input (HIGH to LOW triggered)outputcomplementary output (active LOW)ground (0 V)supply voltage
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NXP Semiconductors
NXP Semiconductors is a leading supplier of embedded controllers offering a broad portfolio of MCUs with Arm-based processors and microcontrollers for a variety of industries including automotive, wireless connectivity and more. They continue to drive innovation offering a strong Power Management portfolio for industrial and automotive applications, including multiple power supplies and battery management solutions. NXP products power and connect across the globe building solutions, helping enhance the proficiency of people, organizations and the world has a whole. Freescale Semiconductor has been acquired by NXP Semiconductor. Freescale Semiconductor parts are now a part of the NXP family (Dec 2015).
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