74HC4059DB,118

Counter Dividers Overview

The 74HC4059DB,118 is a high-speed Si-gate CMOS programmable divide-by-n counter manufactured by NXP USA Inc. It operates within a supply voltage range of 2 V to 6 V and supports a maximum clock frequency of 43 MHz at 6 V. The device features synchronous presettable down counting with four operating modes: timer, divide-by-n, divide-by-10,000, and master preset. It utilizes JAM inputs for programming division ratios from 3 to 15,999 and includes latchable outputs. The component is housed in a 24-pin SO package (SOT137-1) and functions as a core element in digital frequency synthesizer circuits.

Counter Dividers Feature Summary

• Supports four distinct operating modes including timer, divide-by-n, fixed divide-by-10,000, and master preset initialization.
• Features fully static operation with Schmitt-trigger action at the clock input for tolerance to slow signal transitions.
• Provides latchable output capability controlled by the Latch Enable input to maintain output states during counting.
• Allows flexible channel spacing selection through mode select inputs enabling fractional extension and half-channel offset.

Counter Dividers Applications

• Digital frequency synthesizer circuits for communication systems
• Phase-locked-loop (PLL) subsystems
• Fixed or programmable frequency division
• General purpose instrumentation totalizers and time-out timers

Counter Dividers Procurement Notes

Verify the specific ordering suffix and package variant against current manufacturer documentation to ensure compatibility with design requirements. Confirm that the component meets all relevant environmental standards such as RoHS compliance before integration into final assemblies. Check for any product discontinuation notices or lifecycle status updates directly from the supplier to mitigate long-term availability risks.

Counter Dividers Selection Notes

Select this component when a programmable divide-by-n counter is required for frequency synthesis applications. Ensure the logic family matches the system voltage levels, choosing HC for 2V-6V operation. Verify that the 24-pin SO package fits the PCB layout constraints. Consider the maximum clock frequency limits relative to the operating supply voltage to guarantee timing performance across the intended temperature range.

Counter Dividers Part Context

This device belongs to the 74HC/HCT4059 series of programmable divide-by-n counters. It is pin-compatible with the legacy 4000B series '4059' devices while offering improved speed and CMOS characteristics. The series is designed for use in complex digital systems requiring precise frequency division and programmable counting capabilities within standard logic families.

Counter Dividers Replacement Considerations

Direct replacements include other 74HC4059 variants from different manufacturers that maintain pin compatibility and electrical specifications. Verify that substitute components support the same four operating modes and provide equivalent propagation delay characteristics at the target supply voltage.

Counter Dividers FAQ

How is the divide-by-n value programmed?

The division ratio is programmed using the JAM inputs (J1 to J16). The count is calculated based on the selected mode and the binary values applied to these inputs, allowing division by any number from 3 to 15,999.

What is the function of the Master Preset mode?

In Master Preset mode, the flip-flops are preset according to the JAM inputs without starting the count-down immediately. This allows the counter to be initialized to a specific state before beginning normal operation in another mode.

Can the counter operate with slow clock rise times?

Yes, the device incorporates Schmitt-trigger action at the clock input, making it highly tolerant to slower clock rise and fall times compared to standard logic inputs.