Overview
The MC74HC74ADT, produced by onsemi, is a dual D-type flip-flop with set and reset inputs. This device is part of the HC (High-Speed CMOS) logic family and is designed to operate within a wide voltage range. It is identical in pinout to the LS74 and is compatible with standard CMOS outputs as well as LSTTL outputs when used with pull-up resistors.
The MC74HC74ADT consists of two D flip-flops, each with individual set, reset, and clock inputs. The information at the D-input is transferred to the corresponding Q output on the next positive-going edge of the clock input. Both Q and Q' outputs are available from each flip-flop, and the set and reset inputs are asynchronous.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Operating Voltage Range | 2.0 to 6.0 | V | |
| Maximum Clock Frequency | Up to 28 MHz | VCC = 6.0 V | |
| Propagation Delay, Clock to Q or Q' | 17 to 150 ns | VCC = 2.0 to 6.0 V | |
| Propagation Delay, Set or Reset to Q or Q' | 18 to 160 ns | VCC = 2.0 to 6.0 V | |
| Output Transition Time | 13 to 110 ns | VCC = 2.0 to 6.0 V | |
| Maximum Input Capacitance | 10 pF | ||
| Power Dissipation Capacitance (Per Enabled Output) | 5.0 pF (Typical at 25°C, VCC = 5.0 V) | ||
| Maximum Quiescent Supply Current | Up to 80 μA | VCC = 6.0 V |
Key Features
- Output Drive Capability: 10 LSTTL Loads
- Outputs Directly Interface to CMOS, NMOS, and TTL
- High Noise Immunity Characteristic of CMOS Devices
- In Compliance with the JEDEC Standard No. 7.0 A Requirements
- Low Input Current: 1.0 μA
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant
- AEC-Q100 Qualified and PPAP Capable for automotive and other applications requiring unique site and control change requirements
Applications
- Sequential Logic Circuits
- Counters and Shift Registers
- Memory Elements
- Automotive Systems (with -Q suffix)
- General Digital Logic Applications
Q & A
- What is the operating voltage range of the MC74HC74ADT?
The operating voltage range is from 2.0 to 6.0 volts.
- How many D flip-flops are included in the MC74HC74ADT?
The device includes two D flip-flops.
- What are the asynchronous inputs on the MC74HC74ADT?
The set and reset inputs are asynchronous.
- What is the maximum clock frequency for the MC74HC74ADT?
The maximum clock frequency is up to 28 MHz at VCC = 6.0 V.
- Is the MC74HC74ADT compatible with LSTTL outputs?
Yes, it is compatible with LSTTL outputs when used with pull-up resistors.
- What is the propagation delay from clock to Q or Q'?
The propagation delay ranges from 17 to 150 ns depending on the VCC voltage.
- Is the MC74HC74ADT RoHS compliant?
Yes, it is Pb-Free, Halogen Free/BFR Free and RoHS Compliant.
- What are some common applications of the MC74HC74ADT?
Common applications include sequential logic circuits, counters, shift registers, and automotive systems.
- Does the MC74HC74ADT meet automotive standards?
Yes, it is AEC-Q100 Qualified and PPAP Capable for automotive and other applications requiring unique site and control change requirements.
- What is the maximum quiescent supply current for the MC74HC74ADT?
The maximum quiescent supply current is up to 80 μA at VCC = 6.0 V.
