74190
74190 Synchronous Up/Down Decade Counter Technical Summary
Overview
The 74190 is a high-speed synchronous up/down decade counter integrated circuit belonging to the 7400 series of TTL logic devices. This component features fully synchronous operation, allowing it to count in either direction (up or down) based on control inputs. The 74190 is designed for high-reliability counting applications where precise control and fast operation are required.
As a decade counter, the 74190 sequences through ten distinct states (0 through 9) in either ascending or descending order. The synchronous design means all state changes occur simultaneously with the clock pulse, eliminating the ripple effect found in asynchronous counters. This makes the 74190 particularly suitable for applications requiring precise timing and predictable behavior.
Key Features
- Synchronous Operation: All flip-flops are clocked simultaneously for predictable timing
- Up/Down Counting: Selectable count direction via control input
- Parallel Load Capability: Allows presetting the counter to any desired value
- High-Speed Performance: Typical propagation delay of 15ns
- Decade Counting Sequence: Natural BCD count (0000 to 1001)
- Terminal Count Output: Provides indication when counter reaches maximum/minimum count
- Cascadable Design: Multiple counters can be connected for higher modulus operation
- TTL-Compatible Inputs/Outputs: Standard logic levels for easy system integration
Applications
The 74190 finds use in a wide variety of digital systems requiring precise counting operations:
Digital Counting Systems
- Event counters in industrial equipment
- Frequency dividers in communication systems
- Timekeeping circuits for clocks and timers
Industrial Control
- Position sensing and control systems
- Production line item counting
- Process sequencing controllers
Test and Measurement Equipment
- Digital multimeters
- Frequency counters
- Signal generators
Consumer Electronics
- Electronic appliance controls
- Audio equipment frequency selectors
- Display multiplexing circuits
Electrical Characteristics
Absolute Maximum Ratings
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Vcc) | 7 | V |
| Input Voltage | 5.5 | V |
| Operating Temperature Range | 0 to +70 | °C |
| Storage Temperature Range | -65 to +150 | °C |
Recommended Operating Conditions
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Vcc) | 4.75 | 5.0 | 5.25 | V |
| High-Level Input Voltage | 2.0 | - | - | V |
| Low-Level Input Voltage | - | - | 0.8 | V |
| Clock Frequency | - | - | 32 | MHz |
Switching Characteristics (Vcc = 5V, TA = 25°C)
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Propagation Delay (Clock to Q) | - | 15 | 30 | ns |
| Propagation Delay (Load to Q) | - | 20 | 35 | ns |
| Clock Pulse Width (High or Low) | 25 | - | - | ns |
| Setup Time (Data before Clock ↑) | 20 | - | - | ns |
Package Information
The 74190 is available in several standard package configurations:
16-Pin Dual In-Line Package (DIP)
- JEDEC MS-001 standard footprint
- Lead spacing: 2.54mm (0.1 inch)
- Package dimensions: 19.3mm x 6.35mm
- Material: Molded plastic
- Operating temperature: 0°C to +70°C
Surface Mount Options
- SOIC-16 (Small Outline IC)
- TSSOP-16 (Thin Shrink Small Outline Package)
- PLCC-20 (Plastic Leaded Chip Carrier)
