74LS169 technical information, including its features and specifications is available in this post.
Part Number: DM74LS169 / SN74LS169
Function: 4-bit Synchronous Up/Down Binary Counter
Package: DIP, SOP 16 Pin.
Manufacturer: Motorola, National,
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Description
74LS169 is a 4-bit synchronous up/down binary counter with modulo-16 operation, designed in TTL logic with a typical operating frequency of 30MHz and low power dissipation. It features synchronous counting and parallel load capability, carry lookahead for cascading, and a single control input for bidirectional counting with edge-triggered clock operation. This device is commonly used in digital systems for counting, frequency division, address generation, and sequence control applications.
Features
- 4-bit synchronous up/down binary counter
- Modulo-16 counting sequence
- Typical operating frequency up to 30MHz
- Low power dissipation around 100mW
- Fully synchronous design for reliable operation
- Parallel load capability for presetting count values
- Carry lookahead for cascading multiple counters
- Single up/down control input
- Positive edge-triggered clock input
- Input clamp diodes for improved signal integrity
Pinout
Design Notes
- Ensure clean clock edges to maintain synchronous operation and avoid metastability
- Use proper decoupling (0.1µF) close to VCC pin to reduce switching noise
- Carry lookahead pins should be properly routed for cascading multiple stages
- Avoid floating inputs by tying unused pins to defined logic levels
- Consider propagation delay when designing high-speed counting chains
Typical Circuit Usage
- Binary counting and event counting circuits
- Frequency division and clock prescaling
- Address generation in memory systems
- Digital sequencing and timing control
- Cascaded multi-stage counters for extended bit width
How to Choose This Part
- Select when synchronous counting is required for timing accuracy
- Use for applications needing bidirectional counting capability
- Ensure TTL logic level compatibility with surrounding circuitry
- Consider maximum clock frequency requirements
- Evaluate need for cascading via carry lookahead
Applications
- Digital counters and timers
- Frequency divider circuits
- Control logic in embedded systems
- Industrial automation and sequencing
- Test and measurement equipment
Alternative / Equivalent Products
- 74LS168 BCD up/down counter
- 74HC169 CMOS binary counter
- CD4516B CMOS presettable counter
- 74ALS169 advanced low-power Schottky version
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74LS169 PDF File
