The 7490 Datasheet TEXAS INSTRUMENTS is a crucial document for anyone working with digital logic circuits. This datasheet, provided by Texas Instruments, contains all the essential information needed to understand, implement, and troubleshoot the 7490 decade counter integrated circuit. It’s the go-to resource for specifications, operating conditions, pin configurations, and performance characteristics, ensuring proper utilization of this versatile chip.
Understanding the 7490 Decade Counter IC
The 7490 is a Monolithic BCD Decade Counter and is a very common TTL (Transistor-Transistor Logic) IC. It’s specifically designed to count in decimal (base-10), making it ideal for applications like frequency division, digital displays, and event counting. The 7490 contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a divide-by-five counter. These counters can be used separately, or they can be cascaded to create a divide-by-ten (decade) counter or a divide-by-twelve counter.
- Divide-by-two counter: Controlled by input A (pin 14).
- Divide-by-five counter: Controlled by inputs B, C, and D (pins 1, 12, and 9 respectively).
By connecting the output of the divide-by-two counter to the input of the divide-by-five counter, a decade counter is formed. The 7490 datasheet details the different ways to configure the chip for various counting modes and reset/set operations. Understanding these configurations is paramount for successful circuit design. It provides information on:
- Pin assignments for inputs and outputs.
- Truth tables for different operating modes.
- Timing diagrams showing propagation delays.
The 7490 datasheet also specifies the electrical characteristics of the IC, such as voltage and current requirements, operating temperature range, and maximum clock frequency. Proper adherence to these specifications ensures reliable operation and prevents damage to the chip. Consider the parameters described in the following table:
| Parameter | Typical Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 5 | V |
| Operating Temperature | 25 | °C |
Ready to dive deeper and harness the full potential of the 7490? Consult the original 7490 Datasheet from Texas Instruments for the most accurate and comprehensive information.