Overview
The CD74HC4094E 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, and data is shifted on positive clock transitions. The device includes a Strobe input to transfer data from the shift register to the storage register and an Output-Enable signal to control the output states.
Key Specifications
| Parameter | HC Types | HCT Types |
|---|---|---|
| Supply Voltage Range | 2 V to 6 V | 4.5 V to 5.5 V |
| Operating Temperature Range | –55°C to 125°C | –55°C to 125°C |
| Maximum CP Frequency | 30 MHz (at 4.5 V), 24 MHz (at 5 V), 20 MHz (at 6 V) | 30 MHz (at 4.5 V), 24 MHz (at 5 V), 20 MHz (at 5.5 V) |
| Input Rise and Fall Time | 400 ns (at 6 V), 500 ns (at 4.5 V) | 400 ns (at 6 V), 500 ns (at 4.5 V) |
| Input Leakage Current | ±1 μA (at VCC = 5.5 V) | ±1 μA (at VCC = 5.5 V) |
| Supply Current | 8 μA (at VCC = 5.5 V) | 8 μA (at VCC = 5.5 V) |
| Propagation Delay Time (CP to Qn) | 18 ns (at 4.5 V), 43 ns (at 5 V), 53 ns (at 6 V) | 18 ns (at 4.5 V), 43 ns (at 5 V), 53 ns (at 5.5 V) |
| Output Transition Time | 15 ns (at 4.5 V), 19 ns (at 5 V), 22 ns (at 6 V) | 15 ns (at 4.5 V), 19 ns (at 5 V), 22 ns (at 5.5 V) |
| Package Type | PDIP (16 pins) | PDIP (16 pins) |
| Body Size | 19.31 mm × 6.35 mm | 19.31 mm × 6.35 mm |
Key Features
- Buffered Inputs: Ensures stable input signals.
- Separate Serial Outputs: Synchronous to both positive and negative clock edges for cascading.
- Wide Operating Temperature Range: –55°C to 125°C.
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5 V for HC types.
- Direct LSTTL Input Logic Compatibility: For HCT types, with VIL = 0.8 V (Max) and VIH = 2 V (Min).
- CMOS Input Compatibility: Il ≤ 1μA at VOL, VOH.
- Significant Power Reduction: Compared to LSTTL logic ICs.
- Tri-State Outputs: Can be connected directly to common bus lines.
Applications
- Serial to Parallel Data Conversion: Ideal for converting serial data streams into parallel data for processing or storage.
- Cascaded Systems: Suitable for high-speed operation in cascaded systems where multiple shift registers are needed.
- Bus Systems: Can be used in bus-oriented systems where data needs to be transferred between different components.
- Digital Circuits: Useful in various digital circuits requiring serial to parallel data conversion, such as in microcontrollers, digital signal processors, and other integrated circuits.
Q & A
- What is the primary function of the CD74HC4094E?
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 supply voltage ranges for HC and HCT types?
For HC types, the supply voltage range is 2 V to 6 V, and for HCT types, it is 4.5 V to 5.5 V.
- What is the operating temperature range of the CD74HC4094E?
The operating temperature range is –55°C to 125°C.
- How many serial outputs are available for cascading?
Two serial outputs (QS1 and QS2) are available for cascading.
- What is the maximum CP frequency for the CD74HC4094E?
The maximum CP frequency is 30 MHz at 4.5 V, 24 MHz at 5 V, and 20 MHz at 6 V.
- What is the propagation delay time from CP to Qn?
The propagation delay time is approximately 18 ns at 4.5 V, 43 ns at 5 V, and 53 ns at 6 V.
- What is the package type and body size of the CD74HC4094E?
The package type is PDIP with 16 pins, and the body size is 19.31 mm × 6.35 mm.
- What are the key features of the CD74HC4094E in terms of noise immunity and input compatibility?
The device has high noise immunity (NIL = 30%, NIH = 30% of VCC at VCC = 5 V for HC types) and direct LSTTL input logic compatibility for HCT types.
- How does the CD74HC4094E handle power consumption?
The device offers significant power reduction compared to LSTTL logic ICs.
- What are some common applications of the CD74HC4094E?
Common applications include serial to parallel data conversion, cascaded systems, bus systems, and various digital circuits.
