74HC4538D CMOS Digital Integrated Circuits Silicon Monolithic 74HC4538D74HC4538D74HC4538D74HC4538D 1. 1. Functional DescriptionFunctional Description 1. 1. Functional DescriptionFunctional Description Dual Monostable Multivibrator 2. 2. 2. 2. GeneralGeneralGeneralGeneral The 74HC4538D is a high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, A input (positive edge input), and B input (negative edge input). These inputs are valid for a slow rise/fall time signal (t = t = 1 s) as they are schmitt trigger inputs. r f After triggering, the output stays in a MONOSTABLE state for the time period determined by the external resistor and capacitor (R , C ). A low level at CD input breaks this STABLE STATE. In the MONOSTABLE X X state, if a new trigger is applied, it makes the MONOSTABLE period longer (retrigger mode). Limitations for C and R are as follows: X X External capacitor C .........No limitation X External resistor R ...........V = 2.0 V more than 5 k X CC V = 3.0 V more than 1 k CC All inputs are equipped with protection circuits against static discharge or transient excess voltage. 3. 3. Features (Note)Features (Note) 3. 3. Features (Note)Features (Note) (1) High speed: tpd = 25 ns (typ.) at V = 5 V CC (2) Low power dissipation: Standby state: I = 4.0 A (max) at T = 25 CC a Active state: I = 350 A (max) at T = 25 CC a (3) Balanced propagation delays: t t PLH PHL (4) Wide operating voltage range: V = 2.0 to 6.0 V CC(opr) Note: In the case of using only one circuit, CD should be tied to GND, T1 T2QQ should be tied to OPEN, the other inputs should be tied to V or GND. CC Start of commercial production 2016-05 2016 Toshiba Corporation 2017-01-24 1 Rev.6.074HC4538D 4. 4. 4. 4. PackagingPackagingPackagingPackaging SOIC16 5. 5. 5. 5. Pin AssignmentPin AssignmentPin AssignmentPin Assignment 6. 6. MarkingMarking 6. 6. MarkingMarking 2016 Toshiba Corporation 2017-01-24 2 Rev.6.0