Overview
The SN74HC393NSR is a dual 4-bit binary counter produced by Texas Instruments. This device is part of the HC series, known for its high-speed CMOS logic. The SN74HC393NSR contains eight flip-flops and additional gating to implement two individual 4-bit counters in a single package. Each counter has its own clock (CLK) and clear (CLR) inputs, allowing for independent operation. This component is designed to improve system densities by reducing the number of counter packages needed, making it a versatile choice for various digital circuit applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2 | 5 | 6 | V |
| VIH (High-level Input Voltage) at VCC = 6V | 4.2 | - | - | V |
| VIL (Low-level Input Voltage) at VCC = 6V | 1.8 | - | - | V |
| IOH (Output Current) at VCC = 6V, VOH = 5.9V | -4 | - | -5.2 | mA |
| IOL (Output Current) at VCC = 6V, VOL = 0.1V | 4 | - | 5.2 | mA |
| ICC (Quiescent Current) at VCC = 6V | - | 80 | - | μA |
| fclock (Clock Frequency) at VCC = 6V | - | 36 | - | MHz |
| tpd (Propagation Delay) at VCC = 6V | - | 13 | - | ns |
| TA (Operating Free-Air Temperature) | -55 | - | 125 | °C |
Key Features
- Wide operating voltage range of 2V to 6V
- Outputs can drive up to 10 LSTTL loads
- Low power consumption: 80μA max ICC
- Typical propagation delay (tpd) of 13ns
- ±4mA output drive at 5V
- Low input current of 1μA max
- Dual 4-bit binary counters with individual clocks and clear inputs
- Parallel outputs from each counter stage for system timing signals
Applications
The SN74HC393NSR is suitable for a variety of digital circuit applications, including:
- Counting and timing circuits in digital systems
- Frequency division and signal processing
- Automotive and industrial control systems
- Consumer electronics requiring high-speed CMOS logic
- Embedded systems and microcontroller peripherals
Q & A
- What is the operating voltage range of the SN74HC393NSR?
The operating voltage range is from 2V to 6V.
- How many LSTTL loads can the outputs of the SN74HC393NSR drive?
The outputs can drive up to 10 LSTTL loads.
- What is the maximum power consumption of the SN74HC393NSR?
The maximum power consumption is 80μA.
- What is the typical propagation delay of the SN74HC393NSR?
The typical propagation delay is 13ns.
- Does the SN74HC393NSR have individual clocks and clear inputs for each counter?
Yes, each 4-bit counter has its own clock and clear inputs.
- What is the maximum clock frequency for the SN74HC393NSR at 6V VCC?
The maximum clock frequency is 36 MHz.
- What is the recommended bypass capacitor for the power supply?
A 0.1μF capacitor is recommended, and it is acceptable to use multiple capacitors in parallel.
- What are the layout guidelines for using the SN74HC393NSR?
Guidelines include placing bypass capacitors near the power terminal, using wide traces, avoiding 90° corners, and keeping the device and capacitors on the same side of the board.
- What is the operating temperature range for the SN74HC393NSR?
The operating temperature range is from -55°C to 125°C.
- What types of packages are available for the SN74HC393NSR?
The component is available in various packages including SOIC, SOP, TSSOP, and others.
