Overview
The 74HCT164D14 is an 8-bit serial-in, parallel-out shift register produced by Diodes Incorporated. This component is part of the 74HCT series, which is compatible with the TTL (Transistor-Transistor Logic) family. It features two serial data inputs (DSA and DSB) and eight parallel data outputs (Q0 to Q7), making it versatile for various digital circuit applications. The device operates within a voltage range of 4.5V to 5.5V and is available in a 14-pin PDIP (Plastic Dual In-Line Package) package.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC | Operating Voltage | 4.5 | - | 5.5 | V |
| VIH | HIGH-level input voltage | 3.15 | 2.4 | 3.15 | V |
| VIL | LOW-level input voltage | -2.1 | 1.35 | 1.35 | V |
| IOH | HIGH-level output current | -4.0 | - | - | mA |
| IOL | LOW-level output current | 20 | - | 4 | mA |
| ICC | Supply Current | - | - | 160 | μA |
| tCP | CP to Qn propagation delay | 15 | - | 22 | ns |
| fmax | Maximum frequency | - | - | 61 | MHz |
Key Features
- Serial Input and Parallel Output: The device accepts serial data through two inputs (DSA and DSB) and provides eight parallel outputs (Q0 to Q7).
- Edge-Triggered: Data is shifted into the register on the LOW-to-HIGH transitions of the clock (CP) input.
- Master Reset: A LOW on the master reset input (MR) clears the register and forces all outputs LOW, independently of other inputs.
- Input Protection: Inputs include clamp diodes, allowing the use of current limiting resistors to interface inputs to voltages in excess of VCC.
- Package Options: Available in PDIP-14, SO-14, and TSSOP-14 packages.
Applications
- Digital Circuit Design: Suitable for various digital circuit applications requiring serial-to-parallel data conversion.
- Microcontroller and Microprocessor Systems: Can be used in systems where serial data needs to be converted to parallel format for processing or display.
- Display Drivers: Useful in driving display devices that require parallel data inputs.
- Communication Systems: Can be employed in serial communication protocols where data needs to be converted from serial to parallel format.
Q & A
- What is the operating voltage range of the 74HCT164D14?
The operating voltage range is 4.5V to 5.5V.
- How many serial data inputs does the 74HCT164D14 have?
The device has two serial data inputs (DSA and DSB).
- What is the function of the master reset input (MR)?
A LOW on the master reset input clears the register and forces all outputs LOW.
- What is the maximum frequency at which the 74HCT164D14 can operate?
The maximum frequency is up to 61 MHz.
- What types of packages are available for the 74HCT164D14?
It is available in PDIP-14, SO-14, and TSSOP-14 packages.
- How does the device protect its inputs?
The inputs include clamp diodes, allowing the use of current limiting resistors to interface inputs to voltages in excess of VCC.
- What is the propagation delay from CP to Qn?
The propagation delay is typically 15 ns to 22 ns.
- Is the 74HCT164D14 RoHS compliant?
Yes, the device is RoHS compliant.
- What is the supply current of the 74HCT164D14?
The supply current is typically up to 160 μA.
- How does the device handle data entry?
Data is entered serially through DSA or DSB and shifted into the register on the LOW-to-HIGH transitions of the clock (CP) input.
