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DM7490AN from NS,National Semiconductor

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DM7490AN

Manufacturer: NS

Decade and Binary Counters

Partnumber Manufacturer Quantity Availability
DM7490AN NS 199 In Stock

Description and Introduction

Decade and Binary Counters The DM7490AN is a decade counter manufactured by National Semiconductor (NS).  

**Key Specifications:**  
- **Function:** Decade Counter (Divides by 10)  
- **Logic Family:** TTL  
- **Package:** 14-pin DIP (Dual In-line Package)  
- **Supply Voltage (Vcc):** 4.75V to 5.25V (Standard 5V operation)  
- **Operating Temperature Range:** 0°C to 70°C  
- **Output Type:** Standard TTL (Totem Pole)  
- **Maximum Clock Frequency:** Typically 32 MHz  
- **Counting Sequence:** BCD (Binary-Coded Decimal)  
- **Reset Capability:** Asynchronous master reset (MR1 and MR2)  

**Pin Configuration (Key Pins):**  
- **Clock A (Input):** Used for divide-by-2 section  
- **Clock B (Input):** Used for divide-by-5 section  
- **QA, QB, QC, QD (Outputs):** BCD outputs  
- **MR1, MR2 (Inputs):** Active-high reset pins (both must be high to reset counter)  

**Note:** This is a standard TTL IC, requiring proper power decoupling and signal conditioning for reliable operation.  

(Data sourced from National Semiconductor datasheets.)

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