Overview
The 74HC237D is a high-speed CMOS 3-to-8 line decoder and address latch integrated circuit manufactured by Toshiba Semiconductor and Storage. This device is fabricated using silicon gate C2MOS technology, which provides high-speed operation similar to LSTTL while maintaining the low power dissipation characteristic of CMOS devices. The IC includes a 3-bit input latch with a common GL enable input and a 3-to-8 line decoder with enable inputs G1 and G2. This configuration allows for the storage of 3-bit binary data and the selection of one of eight output lines based on this data. The device is particularly useful in applications requiring address decoding and latching functions, such as in memory systems and bus-oriented architectures.
Key Specifications
| Characteristic | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 2.0 to 6.0 | V |
| Input Voltage (VIN) | -0.5 to VCC + 0.5 | V |
| Output Voltage (VOUT) | -0.5 to VCC + 0.5 | V |
| Propagation Delay (tpd) | 12 ns (typ.) at VCC = 5 V | ns |
| Quiescent Supply Current (ICC) | 4.0 µA (max) at Ta = 25 °C | µA |
| Operating Temperature Range | -40 to 125 °C | °C |
| Package Type | SOIC16 |
Key Features
- High speed operation: tpd = 12 ns (typ.) at VCC = 5 V.
- Low power dissipation: ICC = 4.0 µA (max) at Ta = 25 °C.
- Wide operating voltage range: VCC(opr) = 2.0 V to 6.0 V.
- Balanced propagation delays: tPLH ≈ tPHL.
- Multiple input enable for easy expansion or independent controls.
- Active HIGH mutually exclusive outputs.
- High noise immunity and ESD protection: HBM exceeds 2000 V, CDM exceeds 1000 V.
Applications
The 74HC237D is ideally suited for various applications, including:
- Implementing non-overlapping decoders in 3-state systems and strobes (stored address) applications in bus-oriented systems.
- Address decoding in memory systems, where the ability to latch and decode addresses is crucial.
- General-purpose logic and decoding functions in digital circuits where high speed and low power consumption are required.
Q & A
- What is the primary function of the 74HC237D IC?
The primary function of the 74HC237D is to act as a 3-to-8 line decoder and address latch, combining the functions of decoding and latching 3-bit binary data. - What is the operating voltage range of the 74HC237D?
The operating voltage range of the 74HC237D is from 2.0 V to 6.0 V. - What is the typical propagation delay of the 74HC237D at 5 V supply voltage?
The typical propagation delay is 12 ns at a supply voltage of 5 V. - What type of package does the 74HC237D come in?
The 74HC237D comes in a SOIC16 package. - What are the enable inputs for the decoder function?
The decoder function is controlled by enable inputs G1 and G2. When G1 is low or G2 is high, the decoding function is inhibited. - Does the 74HC237D have ESD protection?
Yes, the 74HC237D has ESD protection, with HBM exceeding 2000 V and CDM exceeding 1000 V. - What is the maximum quiescent supply current at 25 °C?
The maximum quiescent supply current is 4.0 µA at 25 °C. - What is the operating temperature range of the 74HC237D?
The operating temperature range is from -40 °C to 125 °C. - Can the 74HC237D be used in bus-oriented systems?
Yes, the 74HC237D is ideally suited for implementing non-overlapping decoders and strobes in bus-oriented systems. - Does the 74HC237D have balanced propagation delays?
Yes, the 74HC237D has balanced propagation delays, with tPLH ≈ tPHL.
