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4-bit D-type Registers with 3-State Output IC - 74HC173
4-bit D-type Registers with 3-State Output IC - 74HC173
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- 3-State Outputs Interface Directly With System Bus
- Gated Output-Control LInes for Enabling or Disabling the Outputs
- Fully Independent Clock Virtually Eliminates Restrictions for Operating in One of Two Modes: – Parallel Load – Do Nothing (Hold)
- For Application as Bus Buffer Registers
- Package Options Include Plastic Small-Outline (D) Packages, Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J)
4-bit D-type Registers with 3-State Output IC - 74HC173
The 74HC Series 74HC173 is a 4-bit register that includes D-type flip-flops featuring totem-pole 3-state outputs capable of driving highly capacitive or relatively low-impedance loads. The high-impedance third state and increased high-logic-level drive provide these flip-flops with the capability of being connected directly to and driving the bus lines in a bus-organized system without the need for interface or pull-up components.
Up to 128 of the 74LS173 outputs can be connected to a common bus and still drive two Series 74LS TTL normalized loads, respectively. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output control circuitry is designed so that the average output disable times are shorter than the average output enable times.
Gated enable inputs are provided on these devices for controlling the entry of data into the flip-flops. When both data-enable (G1, G2) inputs are low, data at the D inputs are loaded into their respective flip-flops on the next positive transition of the buffered clock input. Gate output-control (M, N) inputs also are provided. When both are low, the normal logic states (high or low levels) of the four outputs are available for driving the loads or bus lines. The outputs are disabled independently from the level of the clock by a high logic level at either output-control input. The outputs then present a high impedance and neither load nor drive the bus line. Detailed operation is given in the function table. The 74LS173 is characterized for operation from 0°C to 70°C.
Pinout:
Package Includes:
- 1 x IC - 74HC173
Specifications:
| Supply Voltage | 4.75 - 5.25 V |
| Operation free-air temperature | -5.2 °C |
| Output Current — High | 16 mA |
| Output Current — Low | 70 µA |
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ADDITIONAL RESOURCES
1.What are the uses of 74HC173 IC?
- The 74HC173 integrated circuit is utilised in a wide range of applications, including microcontrollers, digital signal processing, and data storage. It's also utilised to create digital circuits like counters, shift registers, and memory devices.
2.What is the difference between 74HC173 and 74HCT173?
- Both the 74HC173 and 74HCT173 are 4-bit parallel load registers with clock enable control, three-state buffered outputs (Q0 through Q3), and master reset (MR)1. The 74HC173 is a high-speed Si-gate CMOS device, whereas the 74HCT173 is a TTL-compatible TTL-compatible high-speed CMOS device. When compared to the 74HCT173, the 74HC173 is more sensitive to slow rise and fall timings.
