74374 - Octal D-Type Flip-Flop with 3-State Outputs

Overview

The M54/74HC374 and M54/74HC534 are high-speed CMOS octal D-type flip-flops featuring 3-state outputs, fabricated using silicon gate C2MOS technology. These devices are designed for applications requiring high-speed data storage and transfer, with the added flexibility of 3-state outputs for bus-oriented systems. The 74374 is widely used in digital systems where temporary data storage or signal buffering is required.

These flip-flops are part of the 74HC family, which combines the low power consumption of CMOS technology with the high speed and drive capabilities similar to LSTTL. The 3-state outputs allow multiple devices to share a common bus without interference, making them ideal for use in microprocessor systems, data communication, and other digital applications.

Features

• High-Speed Operation: Typical propagation delay of 14 ns at V_CC = 5V.
• Low Power Consumption: CMOS technology ensures minimal power dissipation, typically 4 µA at room temperature.
• 3-State Outputs: Allows for bus-oriented applications by enabling high-impedance outputs when disabled.
• Wide Operating Voltage Range: 2V to 6V, compatible with TTL levels when operated at 5V.
• Octal D-Type Flip-Flops: Eight edge-triggered flip-flops with individual D inputs and 3-state outputs.
• Common Clock and Output Enable: Simplifies control logic with shared clock (CP) and output enable (OE) pins.
• High Noise Immunity: CMOS technology provides excellent noise margins, ensuring reliable operation in noisy environments.
• Latch-Up Performance: Exceeds 250 mA per JESD 78B, Class II.

Applications

The 74374 octal D-type flip-flop is versatile and finds use in a wide range of digital applications, including:

• Microprocessor Systems: Used for temporary data storage, address latching, and interfacing with data buses.
• Data Communication: Buffering and synchronization of data in serial and parallel communication systems.
• Memory Addressing: Latching address lines in memory systems to hold stable addresses during read/write operations.
• Industrial Control Systems: Signal buffering and timing control in PLCs and other industrial automation equipment.
• Test and Measurement Equipment: Capturing and holding digital signals for analysis and processing.
• Consumer Electronics: Used in digital TVs, set-top boxes, and other devices requiring data storage and transfer.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7V
• Input Voltage (V_IN): -0.5V to V_CC + 0.5V
• Output Voltage (V_OUT): -0.5V to V_CC + 0.5V
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 2V to 6V
• Input High Voltage (V_IH): 3.15V (min) at V_CC = 4.5V
• Input Low Voltage (V_IL): 1.35V (max) at V_CC = 4.5V
• Output Current (I_OH/I_OL): ±25 mA

Dynamic Characteristics

• Propagation Delay (t_PD): 14 ns (typical) at V_CC = 5V
• Output Enable Time (t_OE): 18 ns (typical) at V_CC = 5V
• Output Disable Time (t_DIS): 15 ns (typical) at V_CC = 5V
• Setup Time (t_SU): 10 ns (min) at V_CC = 4.5V
• Hold Time (t_H): 3 ns (min) at V_CC = 4.5V

Package Information

The 74374 is available in multiple package options to suit various application requirements. Below are the common package types:

• 20-Pin DIP (Dual In-Line Package):
  • Package Code: 748-02
  • Dimensions: 25.4 mm x 6.35 mm
  • Pin Pitch: 2.54 mm
• 20-Pin SOIC (Small Outline Integrated Circuit):
  • Package Code: 751A-02
  • Dimensions: 12.8 mm x 7.5 mm
  • Pin Pitch: 1.27 mm
• 20-Pin TSSOP (Thin Shrink Small Outline Package):
  • Package Code: 948G-02
  • Dimensions: 6.5 mm x 4.4 mm
  • Pin Pitch: 0.65 mm

Pin Configuration

The 74374 features a standard 20-pin configuration with the following pinout:

• Pins 1-8: Data Inputs (D0-D7)
• Pins 9, 11-13, 15-17, 19: 3-State Outputs (Q0-Q7)
• Pin 10: Ground (GND)
• Pin 20: Supply Voltage (V_CC)
• Pin 18: Clock Input (CP)
• Pin 14: Output Enable (OE, active low)

Conclusion

The 74374 octal D-type flip-flop with 3-state outputs is a robust and versatile component suitable for a wide range of digital applications. Its high-speed operation, low power consumption, and compatibility with TTL levels make it an excellent choice for modern digital designs. Whether used in microprocessor systems, data communication, or industrial control, the 74374 provides reliable performance and flexibility.