Overview
The 74HC137DB,118 is a 3-to-8 line decoder and demultiplexer with address latches, manufactured by Nexperia USA Inc. This integrated circuit decodes three binary weighted address inputs (A0, A1, and A2) to eight mutually exclusive outputs (Y0 to Y7). The device features a latch enable (LE) and two output enable (E1, E2) inputs, allowing for flexible control over the output states. It is designed to operate within a wide supply voltage range from 2.0 to 6.0 V, making it versatile for various applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2.0 V | 6.0 V | ||
| Input Leakage Current (II) | VI = VCC or GND; VCC = 6.0 V | ±0.1 μA | ±1.0 μA | |
| Supply Current (ICC) | VI = VCC or GND; IO = 0 A; VCC = 6.0 V | 8.0 μA | 160 μA | |
| Input Capacitance (CI) | 3.5 pF | |||
| Propagation Delay (tpd) | VCC = 2.0 V, CL = 50 pF | 58 ns | 180 ns | |
| Transition Time (tt) | VCC = 6.0 V, CL = 50 pF | 6 ns | 19 ns | |
| Operating Temperature Range | -40 °C | +125 °C | ||
| Package Type | SSOP16 (SOT338-1) |
Key Features
- Combines 3-to-8 decoder with 3-bit latch
- Multiple input enable for easy expansion or independent controls
- Active LOW mutually exclusive outputs
- Wide supply voltage range from 2.0 to 6.0 V
- CMOS low power dissipation
- High noise immunity
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
- Complies with JEDEC standards (JESD8C and JESD7A)
- ESD protection: HBM (ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V), CDM (ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V)
Applications
The 74HC137DB,118 is suitable for a variety of applications requiring decoding and demultiplexing functions. These include:
- Digital logic circuits
- Memory address decoding
- Data routing and switching
- Embedded systems
- Industrial control systems
Q & A
- What is the primary function of the 74HC137DB,118?
The primary function is to decode three binary weighted address inputs to eight mutually exclusive outputs and to act as a demultiplexer with address latches.
- What is the supply voltage range for the 74HC137DB,118?
The supply voltage range is from 2.0 V to 6.0 V.
- How many output enable inputs does the device have?
The device has two output enable inputs (E1 and E2).
- What is the purpose of the latch enable (LE) input?
The latch enable (LE) input allows the device to store the data present before a LOW-to-HIGH transition, ignoring further address changes while LE remains HIGH.
- What type of package does the 74HC137DB,118 come in?
The device comes in an SSOP16 (SOT338-1) package.
- What are the operating temperature ranges for the 74HC137DB,118?
The operating temperature ranges are from -40 °C to +125 °C.
- Does the 74HC137DB,118 have ESD protection?
Yes, it has ESD protection: HBM (ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V) and CDM (ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V).
- What are some common applications for the 74HC137DB,118?
Common applications include digital logic circuits, memory address decoding, data routing and switching, embedded systems, and industrial control systems.
- How does the device handle inputs exceeding VCC?
The device includes clamp diodes, enabling the use of current limiting resistors to interface inputs to voltages in excess of VCC.
- What is the typical propagation delay for the 74HC137DB,118?
The typical propagation delay varies with supply voltage but is around 58 ns for VCC = 2.0 V and CL = 50 pF.
