HCC40194B 4-Bit Bidirectional Universal Shift Register

Overview

The HCC40194B is a high-performance CMOS 4-bit bidirectional universal shift register designed for medium-speed operation. It features fully static operation, synchronous parallel or serial data handling, and three-state outputs, making it suitable for a wide range of digital applications. The device operates across a broad voltage range (5V to 15V) and is compliant with JEDEC standards, ensuring reliability and compatibility in industrial and consumer electronics.

Key Features

• Medium-Speed Operation: Typical clock frequency of 9MHz at 10V supply.
• Fully Static Operation: No minimum clock frequency required.
• Bidirectional Data Flow: Supports both serial and parallel data transfer.
• Synchronous Operation: Parallel or serial loading controlled by clock signals.
• Three-State Outputs: Allows bus-oriented applications (HCC/HCF40104B variant).
• Asynchronous Master Reset: Immediate clearing of all registers (HCC40194B).
• Low Power Consumption: Quiescent current as low as 100nA at 18V and 25°C.
• Wide Voltage Range: Operates at 5V, 10V, and 15V parametric ratings.
• Standardized Output Characteristics: Symmetrical output drive capability.
• Compliance: Meets JEDEC Tentative Standard No. 13A for CMOS devices.

Applications

The HCC40194B is versatile and can be used in various digital systems, including:

• Data Storage and Transfer: Serial-to-parallel or parallel-to-serial conversion.
• Shift Register Applications: Time delay circuits, pattern generators.
• Bus Systems: Three-state outputs facilitate shared bus communication.
• Industrial Control Systems: Sequence control, state machine design.
• Consumer Electronics: LED matrix control, display drivers.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.5V to +20V
• Input Voltage (V_IN): -0.5V to V_DD + 0.5V
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (V_DD = 10V, T_A = 25°C)

• High-Level Input Voltage (V_IH): 7V min
• Low-Level Input Voltage (V_IL): 3V max
• High-Level Output Voltage (V_OH): 9.95V min (I_OH = -0.4mA)
• Low-Level Output Voltage (V_OL): 0.05V max (I_OL = 0.4mA)
• Input Leakage Current (I_IN): ±100nA max at 18V
• Quiescent Supply Current (I_DD): 1µA max at 20V

AC Characteristics (V_DD = 10V, T_A = 25°C)

• Maximum Clock Frequency (f_CL): 9MHz typical
• Propagation Delay (t_PHL, t_PLH): 150ns max (CL = 50pF)
• Setup Time (t_SU): 60ns min for parallel load
• Hold Time (t_H): 10ns min for parallel load

Package Information

The HCC40194B is available in multiple package options to suit different assembly requirements:

• DIP-16 (Plastic Dual In-Line Package): 19.3mm x 6.35mm body, 2.54mm pin spacing.
• SO-16 (Small Outline Package): 9.9mm x 3.9mm body, 1.27mm pin spacing.
• TSSOP-16 (Thin Shrink Small Outline Package): 5mm x 4.4mm body, 0.65mm pin spacing.

All packages are RoHS-compliant and support industrial temperature ranges unless otherwise specified.

Functional Description

The HCC40194B is a 4-bit universal shift register with synchronous parallel and serial input/output capabilities. It features two mode control inputs (S0 and S1) that determine the operational mode:

• S0=0, S1=0: No operation (outputs hold current state).
• S0=1, S1=0: Shift right (data moves from Q0 to Q3).
• S0=0, S1=1: Shift left (data moves from Q3 to Q0).
• S0=1, S1=1: Parallel load (data inputs D0-D3 transferred to outputs).

The asynchronous master reset (MR) overrides all operations, forcing all outputs to logic low when activated.

Conclusion

The HCC40194B is a robust and flexible shift register ideal for applications requiring bidirectional data flow and synchronous control. Its low power consumption, wide voltage range, and compliance with industry standards make it a reliable choice for designers working on digital systems, from industrial automation to consumer electronics.