Overview
The CD74HC138M96 is a 3-to-8 line decoder/demultiplexer produced by Texas Instruments. This component is part of the HC (High-Speed CMOS) logic family and is well-suited for applications such as memory address decoding or data routing. The device features three address select inputs (A2, A1, and A0) and three enable inputs (G2, G1, and G0) to simplify cascading and facilitate demultiplexing.
The CD74HC138M96 operates within a wide temperature range of -55°C to 125°C and supports supply voltages from 2 V to 6 V. It is available in a 16-pin SOIC (Small Outline Integrated Circuit) package, making it compact and suitable for various electronic designs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage Range (VCC) | 2 | 6 | V | |
| Input Voltage Range (VI) | 0 | VCC | V | |
| Output Voltage Range (VO) | 0 | VCC | V | |
| Temperature Range (TA) | -55 | 125 | °C | |
| Propagation Delay (tpd) at VCC = 5 V, CL = 50 pF | 13 | 30 | ns | |
| Output Transition Time (tt) at VCC = 5 V, CL = 50 pF | 15 | 19 | ns | |
| Power Dissipation Capacitance (Cpd) at CL = 15 pF | 67 | pF | ||
| Input Capacitance (Ci) | 10 | pF | ||
| Junction-to-Ambient Thermal Resistance (RθJA) for SOIC package | 73 | °C/W |
Key Features
- Select one of eight data outputs: Active low for '138 and active high for '238.
- Three enable inputs (G2, G1, and G0) to simplify cascading and facilitate demultiplexing.
- Wide operating temperature range: -55°C to 125°C.
- High noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5 V.
- Low power consumption compared to LSTTL logic ICs.
- HC types operate from 2 V to 6 V, and HCT types operate from 4.5 V to 5.5 V.
- Direct LSTTL input logic compatibility for HCT types.
- CMOS input compatibility with low input current (Il ≤ 1µA at VOL, VOH).
- Balanced propagation delay and transition times.
- Fanout capability: Bus driver outputs can drive up to 15 LSTTL loads, and standard outputs can drive up to 10 LSTTL loads.
Applications
- Memory address decoding.
- Data routing in digital systems.
- I/O port or memory selector applications.
- Demultiplexing functions in various digital circuits.
- General-purpose decoding in electronic systems.
Q & A
- What is the primary function of the CD74HC138M96?
The primary function is to act as a 3-to-8 line decoder/demultiplexer.
- What are the operating voltage ranges for the CD74HC138M96?
The device operates from 2 V to 6 V.
- What is the temperature range for the CD74HC138M96?
The device operates within a temperature range of -55°C to 125°C.
- How many enable inputs does the CD74HC138M96 have?
The device has three enable inputs (G2, G1, and G0).
- What is the typical propagation delay at VCC = 5 V and CL = 50 pF?
The typical propagation delay is 13 ns.
- What is the fanout capability of the CD74HC138M96?
Bus driver outputs can drive up to 15 LSTTL loads, and standard outputs can drive up to 10 LSTTL loads.
- Is the CD74HC138M96 compatible with LSTTL input logic?
Yes, the HCT types are directly compatible with LSTTL input logic.
- What is the input capacitance of the CD74HC138M96?
The input capacitance is approximately 10 pF.
- What package types are available for the CD74HC138M96?
The device is available in a 16-pin SOIC package.
- What are some common applications of the CD74HC138M96?
Common applications include memory address decoding, data routing, and demultiplexing functions.
