Overview
The SN74HC138-Q1, produced by Texas Instruments, is a 3-line to 8-line decoder/demultiplexer designed for high-performance applications. This integrated circuit is particularly suited for memory-decoding or data-routing tasks that require short propagation delay times. It operates within a supply voltage range of 2 V to 6 V, making it versatile for various system designs. The device is qualified for automotive applications and features ESD protection exceeding 2000 V per MIL-STD-883, Method 3015. It is available in 16-pin TSSOP packages and supports a wide operating temperature range from -40°C to 125°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Output Voltage (VO) | 0 | VCC | V | |
| Propagation Delay Time (tpd) | 15 ns (VCC=6V), 31 ns (VCC=4.5V), 46 ns (VCC=2V) | ns | ||
| Output Drive Current | ±4 mA (VCC=5V) | mA | ||
| Operating Temperature Range | -40 | 125 | °C | |
| Package Type | 16-pin TSSOP |
Key Features
- High-speed operation with propagation delay times as low as 15 ns at VCC = 6 V.
- Low power consumption, with a maximum ICC of 80 µA.
- ESD protection exceeding 2000 V per MIL-STD-883, Method 3015.
- Three enable inputs (two active-low and one active-high) to simplify cascading and data reception.
- Outputs can drive up to 10 LSTTL loads.
- Low input current of 1 µA max.
- Qualified for automotive applications with an operating temperature range from -40°C to 125°C.
Applications
- High-performance memory-decoding systems: The SN74HC138-Q1 is designed to minimize system decoding delays, making it ideal for fast memory systems.
- Data-routing applications: It can be used in demultiplexing applications where an enable input can serve as a data input.
- Automotive systems: Qualified for use in automotive applications due to its robust ESD protection and wide operating temperature range.
- General digital logic circuits: Suitable for any application requiring 3-line to 8-line decoding or demultiplexing functions).
Q & A
- What is the primary function of the SN74HC138-Q1?
The SN74HC138-Q1 is a 3-line to 8-line decoder/demultiplexer, designed for high-performance memory-decoding or data-routing applications).
- What is the operating voltage range of the SN74HC138-Q1?
The device operates within a supply voltage range of 2 V to 6 V).
- What is the propagation delay time of the SN74HC138-Q1?
The propagation delay time is as low as 15 ns at VCC = 6 V, 31 ns at VCC = 4.5 V, and 46 ns at VCC = 2 V).
- What type of ESD protection does the SN74HC138-Q1 offer?
The device features ESD protection exceeding 2000 V per MIL-STD-883, Method 3015).
- What is the maximum output drive current of the SN74HC138-Q1?
The outputs can drive up to ±4 mA at VCC = 5 V).
- What are the enable input configurations of the SN74HC138-Q1?
The device has three enable inputs: two active-low and one active-high).
- What is the operating temperature range of the SN74HC138-Q1?
The device operates from -40°C to 125°C).
- What package types are available for the SN74HC138-Q1?
The device is available in 16-pin TSSOP packages).
- Is the SN74HC138-Q1 qualified for automotive applications?
Yes, it is qualified for automotive applications).
- What are some typical applications of the SN74HC138-Q1?
Typical applications include high-performance memory-decoding systems, data-routing applications, and general digital logic circuits).
