Overview
The SN74HC251DG4 is a data selector/multiplexer produced by Texas Instruments. It is a 3-state version of the 'HC151 and features full binary decoding to select 1-of-8 data sources. This device is designed to interface directly with system buses and can drive up to 15 LSTTL loads. The SN74HC251DG4 operates over a wide voltage range of 2 V to 6 V, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage | 1.5 (VCC = 2 V) | 3.15 (VCC = 4.5 V) | - | V |
| VOH High-Level Output Voltage | 1.9 (VCC = 2 V, IOH = -20 μA) | 4.4 (VCC = 4.5 V, IOH = -20 μA) | 5.9 (VCC = 6 V, IOH = -20 μA) | V |
| VOL Low-Level Output Voltage | 0.1 (VCC = 2 V, IOL = 20 μA) | 0.1 (VCC = 4.5 V, IOL = 20 μA) | 0.1 (VCC = 6 V, IOL = 20 μA) | V |
| ICC Quiescent Current | - | 8 | 80 | μA |
| tpd Propagation Delay | 58 (VCC = 2 V, CL = 50 pF) | 21 (VCC = 4.5 V, CL = 50 pF) | 19 (VCC = 6 V, CL = 50 pF) | ns |
| TJ Junction Temperature | - | - | 150 | °C |
Key Features
- 3-state version of 'HC151 with strobe-controlled complementary 3-state outputs.
- Wide operating voltage range of 2 V to 6 V.
- High-current 3-state outputs that can interface directly with system bus or drive up to 15 LSTTL loads.
- Low power consumption with a maximum ICC of 80 μA.
- Typical propagation delay of 9 ns.
- ±6-mA output drive at 5 V.
- Low input current of 1 μA max.
- Perform parallel-to-serial conversion.
- Complementary outputs provide true and inverted data.
Applications
- Bus-organized systems where multiple data sources need to be selected and multiplexed.
- Data communication systems requiring high-speed data selection and multiplexing.
- Embedded systems and microcontrollers where efficient data handling is crucial.
- Industrial control systems that require reliable and fast data processing.
- Automotive and aerospace applications where robust and versatile logic devices are needed.
Q & A
- What is the operating voltage range of the SN74HC251DG4?
The operating voltage range is from 2 V to 6 V.
- How many data sources can the SN74HC251DG4 select?
The device can select 1-of-8 data sources.
- What is the maximum propagation delay of the SN74HC251DG4?
The typical propagation delay is around 9 ns, but it can vary based on the load and voltage.
- Can the SN74HC251DG4 drive LSTTL loads?
Yes, it can drive up to 15 LSTTL loads.
- What is the maximum ICC (quiescent current) of the SN74HC251DG4?
The maximum ICC is 80 μA.
- How are the outputs controlled in the SN74HC251DG4?
The outputs are controlled by the output-enable (OE) input. The outputs are disabled when OE is high.
- What is the junction temperature range for the SN74HC251DG4?
The junction temperature range is up to 150 °C.
- Can the SN74HC251DG4 perform parallel-to-serial conversion?
Yes, it can perform parallel-to-serial conversion.
- What type of outputs does the SN74HC251DG4 provide?
The device provides complementary outputs that offer true and inverted data.
- What are the common applications of the SN74HC251DG4?
Common applications include bus-organized systems, data communication systems, embedded systems, industrial control systems, and automotive/aerospace applications.
