Overview
The CD74HC4094PWRG4 is a high-speed CMOS logic 8-stage serial shift register produced by Texas Instruments. This device features a storage latch associated with each stage, allowing for the transfer of data from the serial input to parallel buffered tri-state outputs. The parallel outputs can be connected directly to common bus lines, making it versatile for various applications. 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. The Output-Enable signal controls the appearance of data at the outputs.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Operating Voltage Range | 2 to 6 V (HC types), 4.5 to 5.5 V (HCT types) | V | |
| Maximum CP Frequency | 30 MHz (HC types), 24 MHz (HCT types) | MHz | VCC = 5 V |
| Input Leakage Current | ±0.1 µA (HC types), ±1 µA (HCT types) | µA | VCC = 5.5 V |
| Supply Current | 8 µA (HC types), 80 µA (HCT types) | µA | VCC = 5.5 V |
| Propagation Delay Time (CP to Qn) | 18 ns (HC types), 43 ns (HCT types) | ns | CL = 50 pF |
| Output Transition Time | 15 ns (HC types), 22 ns (HCT types) | ns | CL = 50 pF |
| Input Capacitance | 10 pF | pF | |
| Power Dissipation Capacitance | 110 pF | pF | CL = 15 pF |
| Tri-state Output Capacitance | 15 pF | pF | |
| Package Type | TSSOP (16 pins) | ||
| Body Size | 5.00 mm × 4.40 mm | mm |
Key Features
- Buffered inputs
- Separate serial outputs synchronous to both positive and negative clock edges for cascading
- Fanout capability: Standard outputs support 10 LSTTL loads, bus driver outputs support 15 LSTTL loads
- Wide operating temperature range: −55°C to 125°C
- Balanced propagation delay and transition times
- Significant power reduction compared to LSTTL logic ICs
- HC types: 2- to 6-V operation, high noise immunity
- HCT types: 4.5- to 5.5-V operation, direct LSTTL input logic compatibility
Applications
- Serial-to-parallel data conversion in digital systems
- Cascaded shift register applications where high-speed operation is required
- Buffering and storage of serial data in various digital circuits
- Use in digital counters, timers, and other sequential logic circuits
- Integration into microcontroller and microprocessor systems for data handling
Q & A
- What is the primary function of the CD74HC4094PWRG4?
The primary function is to act as an 8-stage serial shift register with a storage latch associated with each stage, allowing data to be transferred from serial input to parallel buffered tri-state outputs.
- What are the operating voltage ranges for the HC and HCT types?
The HC types operate from 2 to 6 V, while the HCT types operate from 4.5 to 5.5 V.
- How many LSTTL loads can the standard outputs support?
The standard outputs can support up to 10 LSTTL loads.
- What is the maximum CP frequency for the HC and HCT types?
The maximum CP frequency is 30 MHz for HC types and 24 MHz for HCT types.
- What is the propagation delay time from CP to Qn?
The propagation delay time from CP to Qn is 18 ns for HC types and 43 ns for HCT types.
- What is the input leakage current for the HC and HCT types?
The input leakage current is ±0.1 µA for HC types and ±1 µA for HCT types.
- What is the supply current for the HC and HCT types?
The supply current is 8 µA for HC types and 80 µA for HCT types.
- What is the package type and body size of the CD74HC4094PWRG4?
The package type is TSSOP with 16 pins, and the body size is 5.00 mm × 4.40 mm.
- What are some common applications of the CD74HC4094PWRG4?
Common applications include serial-to-parallel data conversion, cascaded shift register applications, buffering and storage of serial data, and integration into digital counters and timers.
- How does the device handle data transfer and output enable?
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. The Output-Enable signal controls the appearance of data at the outputs.
