Overview
The MC74HCT4094A is a high-speed CMOS 8-bit serial shift and storage register produced by onsemi. This device integrates an 8-bit shift register and a latch with 3-state output buffers. Data is shifted on positive clock (CP) transitions, and the data in the shift register is transferred to the storage register when the Strobe (STR) input is high. The output buffers are enabled when the Output Enable (OE) input is set high. The device also features two serial outputs (QS1, QS2) for cascading multiple devices, making it suitable for interfacing TTL or CMOS outputs to high-speed CMOS inputs.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| DC Supply Voltage (VCC) | 4.5 | 5.5 | V |
| DC Input Voltage (Vin) | 0 | VCC + 0.5 | V |
| DC Output Voltage (Vout) | 0 | VCC + 0.5 | V |
| Operating Temperature (TA) | -55 | 125 | °C |
| Input Rise and Fall Time (tr, tf) | 0 | 500 | ns |
| Maximum Propagation Delay (CP to QS1) | 30 | 45 | ns |
| Maximum Clock Pulse Frequency | 20 | 30 | MHz |
| Maximum Input Capacitance (Cin) | 10 | pF | |
| Maximum Output Capacitance (Cout) | 15 | pF | |
| Maximum Quiescent Supply Current (ICC) | 4 | 80 | μA |
Key Features
- Wide Operating Voltage Range: 4.5 to 5.5 V
- Low Power Dissipation: ICC < 10 μA
- In Compliance with the Requirements Defined by JEDEC Standard No. 7A
- Pb-Free Devices
- 3-state output buffers
- Two serial outputs (QS1, QS2) for cascading multiple devices
- Data shifted on positive clock (CP) transitions
- Data transfer from shift register to storage register on high Strobe (STR) input
- Output buffers enabled by high Output Enable (OE) input
Applications
The MC74HCT4094A is versatile and can be used in various applications, including:
- Interfacing TTL or CMOS outputs to high-speed CMOS inputs
- Serial-to-parallel data conversion
- Parallel-to-serial data conversion
- Cascading multiple shift registers for extended data storage
- Digital display drivers and other digital systems requiring serial data processing
Q & A
- What is the operating voltage range of the MC74HCT4094A?
The operating voltage range is 4.5 to 5.5 V.
- How is data shifted in the MC74HCT4094A?
Data is shifted on positive clock (CP) transitions.
- What triggers the transfer of data from the shift register to the storage register?
The data is transferred when the Strobe (STR) input is high.
- How are the output buffers enabled?
The output buffers are enabled when the Output Enable (OE) input is set high.
- What are the serial output options for cascading?
Two serial outputs (QS1, QS2) are available for cascading multiple devices.
- What is the maximum propagation delay from CP to QS1?
The maximum propagation delay is 45 ns.
- What is the maximum clock pulse frequency?
The maximum clock pulse frequency is 30 MHz.
- Is the MC74HCT4094A Pb-free?
Yes, the MC74HCT4094A is a Pb-free device.
- What is the maximum quiescent supply current?
The maximum quiescent supply current is 80 μA.
- What are the package options for the MC74HCT4094A?
The device is available in SOIC-16 and TSSOP-16 packages.
