Overview
The CD74HC4094PWRE4 is a high-speed CMOS logic 8-stage serial shift and store bus register manufactured by Texas Instruments. This integrated circuit is designed to handle serial data input and store it in a parallel format, making it suitable for various digital logic applications. The device features buffered inputs, separate serial outputs for cascading, and tri-state outputs that can be connected directly to common bus lines. Data is shifted on positive clock transitions, and the storage register transfers data to the outputs when the Output-Enable signal is high.
Key Specifications
| Parameter | Min | Max | Unit | Description |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2 | 6 | V | For HC types |
| VCC (Supply Voltage) - HCT types | 4.5 | 5.5 | V | For HCT types |
| Operating Temperature | -55 | 125 | °C | Wide operating temperature range |
| Maximum CP Frequency | 20 | 30 | MHz | For HC and HCT types at VCC = 4.5V to 5.5V |
| CP Pulse Width | 16 | 24 | ns | Minimum clock pulse width |
| Data Set-up Time | 10 | 15 | ns | Time required for data to be set up before the clock edge |
| Data Hold Time | 3 | 3 | ns | Time data must be held after the clock edge |
| Input Leakage Current | ±0.1 | ±1 | μA | At VCC and GND |
| Supply Current | 8 | 160 | μA | At VCC = 5.5V |
| Output Transition Time | 13 | 22 | ns | Time for output to transition from high to low or low to high |
Key Features
- Buffered Inputs: Ensures stable input signals and reduces noise susceptibility.
- Separate Serial Outputs: QS1 and QS2 outputs for cascading, synchronized with positive and negative clock edges respectively.
- Tri-State Outputs: Parallel outputs can be connected directly to common bus lines and are in a high-impedance state when the Output-Enable signal is low.
- Wide Operating Temperature Range: Operates from -55°C to 125°C, making it suitable for a variety of environments.
- High Noise Immunity: HC types have high noise immunity with NIL = 30%, NIH = 30% of VCC at VCC = 5V.
- LSTTL Input Compatibility: HCT types are compatible with LSTTL input logic, VIL = 0.8V (Max), VIH = 2V (Min).
- Low Power Consumption: Significant power reduction compared to LSTTL logic ICs.
Applications
- Serial to Parallel Data Conversion: Ideal for converting serial data streams into parallel data formats, useful in digital communication systems and data processing units.
- Cascaded Systems: The separate serial outputs (QS1 and QS2) enable easy cascading of multiple devices, making it suitable for complex digital logic circuits.
- Bus Systems: The tri-state outputs can be connected directly to common bus lines, making it useful in bus-oriented architectures.
- Industrial and Automotive Systems: The wide operating temperature range and high noise immunity make it suitable for use in industrial and automotive applications.
Q & A
- What is the CD74HC4094PWRE4 used for?
The CD74HC4094PWRE4 is used as an 8-stage serial shift and store bus register, converting serial data into parallel format and storing it in a tri-state output configuration.
- What are the operating voltage ranges for the CD74HC4094PWRE4?
The operating voltage range for HC types is 2V to 6V, and for HCT types, it is 4.5V to 5.5V.
- What is the maximum clock frequency for the CD74HC4094PWRE4?
The maximum clock frequency is 20 MHz to 30 MHz depending on the supply voltage.
- How does the device handle data transfer?
Data is shifted on positive clock transitions, and the data in each shift register stage is transferred to the storage register when the Strobe input is high.
- What are the benefits of using the CD74HC4094PWRE4 in cascaded systems?
The device provides separate serial outputs (QS1 and QS2) that are synchronized with positive and negative clock edges, respectively, facilitating high-speed operation in cascaded systems.
- What is the significance of tri-state outputs in the CD74HC4094PWRE4?
The tri-state outputs can be connected directly to common bus lines and can be in a high-impedance state when the Output-Enable signal is low, reducing bus contention.
- How does the CD74HC4094PWRE4 handle noise immunity?
The HC types have high noise immunity with NIL = 30%, NIH = 30% of VCC at VCC = 5V, and HCT types are compatible with LSTTL input logic.
- What is the power consumption of the CD74HC4094PWRE4?
The device has significant power reduction compared to LSTTL logic ICs, with supply current ranging from 8 μA to 160 μA at VCC = 5.5V.
- What are the typical applications of the CD74HC4094PWRE4?
It is used in serial to parallel data conversion, cascaded systems, bus systems, and in industrial and automotive applications due to its wide operating temperature range.
- What are the available package types for the CD74HC4094PWRE4?
The device is available in various packages including PDIP, SOIC, TSSOP, and others as specified in the datasheet.
