Overview
The 74HC194D is a 4-bit bidirectional universal shift register produced by Nexperia USA Inc. This component is designed for synchronous operation, controlled by mode select inputs (S0, S1). It supports parallel load, serial shift (both left and right), and hold modes, making it versatile for various digital circuit applications. The device operates within a wide supply voltage range from 2.0 V to 6.0 V and is known for its low power dissipation and high noise immunity.
Key Specifications
| Parameter | Value |
|---|---|
| Type Number | 74HC194D |
| Package | SO16 (SOT109-1) |
| Number of Bits | 4-bit |
| Supply Voltage Range | 2.0 V to 6.0 V |
| Operating Temperature Range | -40 °C to +85 °C and -40 °C to +125 °C |
| Mode Select Inputs | S0, S1 |
| Shift Directions | Left and Right |
| Reset Type | Asynchronous Master Reset (MR) |
| ESD Protection | HBM JESD22-A114F exceeds 2000 V, MM JESD22-A115-A exceeds 200 V |
Key Features
- Wide supply voltage range from 2.0 V to 6.0 V
- CMOS low power dissipation
- High noise immunity
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
- Complies with JEDEC standards: JESD8C (2.7 V to 3.6 V) and JESD7A (2.0 V to 6.0 V)
- CMOS input levels
- Synchronous parallel and serial data transfer
- Shift-left and shift-right capability
- Easily expanded for both serial and parallel operation
- Asynchronous master reset
- Hold (‘do nothing’) mode
- ESD protection: HBM JESD22-A114F exceeds 2000 V, MM JESD22-A115-A exceeds 200 V
Applications
The 74HC194D is suitable for a variety of digital circuit applications, including:
- Serial and parallel data transfer systems
- Shift registers in digital counters and dividers
- Data storage and retrieval systems
- Digital signal processing circuits
- Automated control systems requiring data shifting
Q & A
- What is the primary function of the 74HC194D?
The primary function of the 74HC194D is to act as a 4-bit bidirectional universal shift register, allowing for parallel load, serial shift (both left and right), and hold operations.
- What is the supply voltage range for the 74HC194D?
The supply voltage range for the 74HC194D is from 2.0 V to 6.0 V.
- How is the mode of operation selected in the 74HC194D?
The mode of operation is selected using the mode select inputs (S0, S1).
- What types of shift operations can the 74HC194D perform?
The 74HC194D can perform both left and right serial shift operations.
- Does the 74HC194D have an asynchronous reset feature?
- What is the operating temperature range for the 74HC194D?
The operating temperature range for the 74HC194D is from -40 °C to +85 °C and -40 °C to +125 °C.
- What type of ESD protection does the 74HC194D offer?
The 74HC194D offers ESD protection with HBM JESD22-A114F exceeding 2000 V and MM JESD22-A115-A exceeding 200 V.
- Is the 74HC194D compliant with any specific standards?
- What package types are available for the 74HC194D?
The 74HC194D is available in the SO16 (SOT109-1) package.
- Is the 74HC194D suitable for high-noise environments?
