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Product Detailed Parameters
- Description：IC FF D-TYPE DUAL 1BIT 14DQFN
- Series：74LCX
- Mfr：Fairchild Semiconductor
- Package：Bulk
- Function：Set(Preset) and Reset
- Type：D-Type
- Output Type：Complementary
- Number of Elements：2
- Number of Bits per Element：1
- Clock Frequency：150 MHz
- Max Propagation Delay @ V, Max CL：7ns @ 3.3V, 50pF
- Trigger Type：Positive Edge
- Current - Output High, Low：24mA, 24mA
- Voltage - Supply：2V ~ 3.6V
- Current - Quiescent (Iq)：10 µA
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Supplier Device Package：14-DQFN (3x2.5)
- Package / Case：14-VFQFN Exposed Pad
- Input Capacitance：7 pF
- Grade：-
- Qualification：-
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Overview
The Fairchild Semiconductor 74LCX74BQX is a dual D-type flip-flop featuring asynchronous Clear and Set inputs with complementary Q and Q outputs. It operates within a supply voltage range of 2V to 3.6V, delivering output currents of 24mA for both high and low states. The device exhibits a quiescent current of 10µA and an input capacitance of 7pF. Packaged in a compact BQX format, it supports positive edge triggering and is designed for low-voltage applications requiring reliable data storage.
Feature Summary
- Dual D-type flip-flop architecture with complementary outputs
- Asynchronous Clear and Set control inputs
- Positive edge-triggered operation
- 5V tolerant I/O capabilities
Applications
- Parallel-to-serial data conversion circuits
- Shift register implementations
- General-purpose memory storage elements
- Timing delay circuits
Procurement Notes
Verify the specific package marking and manufacturer lot codes upon receipt to ensure authenticity. Confirm that the received components match the 74LCX74BQX designation exactly. Check datasheets for any revisions or obsolescence notices from ON Semiconductor, as Fairchild's logic portfolio has undergone corporate transitions. Ensure storage conditions comply with moisture sensitivity levels specified in the official documentation.
Selection Notes
Select this component when a dual D-type flip-flop with independent set and clear functions is required in low-voltage systems. It is suitable for designs operating between 2V and 3.6V where 5V tolerance is beneficial for interfacing. Consider the BQX package size constraints and the need for asynchronous control signals over synchronous-only alternatives.
Part Context
This part belongs to the 74LCX series of low-voltage CMOS logic devices. The LCX family is characterized by fast switching speeds and low power consumption, making it ideal for portable and battery-operated electronics. The 74LCX74 variant specifically provides dual flip-flops, distinguishing it from single or octal configurations within the same logical family.
Replacement Considerations
Check for equivalents such as the 74LCX74MX which shares similar electrical characteristics but may differ in package dimensions. Verify pin compatibility before substitution.
