Overview
The SN74LV4040A, produced by Texas Instruments, is a 12-bit asynchronous binary counter. This device features all stages of the counter available externally, making it versatile for various applications. It operates within a voltage range of 2V to 5.5V, supporting mixed-mode voltage operation on all ports. The counter is advanced on a high-to-low transition at the clock (CLK) input and can be asynchronously cleared by a high level at the clear (CLR) input. The SN74LV4040A is fully specified for partial-power-down applications, utilizing Ioff circuitry to prevent damaging current backflow when powered down.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | -0.5 | 7 | V | |
| Operating Free-Air Temperature Range | -40 | 85 | °C | |
| Input Transition Rise/Fall Time (VCC = 3.3V) | 100 | ns | ||
| Low-Level Output Current (VCC = 3.3V, IOL = 6mA) | 0.44 | V | ||
| High-Level Output Voltage (VCC = 3.3V, IOH = -6mA) | 2.3 | V | ||
| Pulse Duration CLK High or Low (VCC = 3.3V) | 5 | 5 | ns | |
| Setup Time CLR Inactive Before CLK↓ (VCC = 3.3V) | 5 | 5 | ns | |
| Propagation Delay Time (CLK to QA, VCC = 3.3V, CL = 50pF) | 7.5 | 15.4 | 17.5 | ns |
Key Features
- Operates from 2V to 5.5V supply voltage
- Supports mixed-mode voltage operation on all ports
- High on-off output-voltage ratio
- Low crosstalk between switches
- Individual switch controls
- Extremely low input current
- Ioff supports partial-power-down mode operation
- Latch-up performance exceeds 100mA per JESD 78, class II
Applications
- Time-delay circuits
- Counter controls
- Frequency-dividing circuits
- Partial-power-down applications
Q & A
- What is the operating voltage range of the SN74LV4040A?
The SN74LV4040A operates from 2V to 5.5V.
- How is the counter advanced in the SN74LV4040A?
The counter is advanced on a high-to-low transition at the clock (CLK) input.
- What is the effect of a high level at the clear (CLR) input?
A high level at the clear (CLR) input asynchronously clears the counter and resets all outputs low.
- Does the SN74LV4040A support partial-power-down mode?
- What are some common applications of the SN74LV4040A?
Common applications include time-delay circuits, counter controls, and frequency-dividing circuits.
- What is the maximum operating free-air temperature for the SN74LV4040A?
The maximum operating free-air temperature is 85°C.
- What is the typical propagation delay time from CLK to QA at VCC = 3.3V and CL = 50pF?
The typical propagation delay time is 15.4 ns.
- Does the SN74LV4040A have any special features for reducing crosstalk?
- What is the latch-up performance of the SN74LV4040A?
The latch-up performance exceeds 100mA per JESD 78, class II.
- What are the package options available for the SN74LV4040A?
The device is available in PDIP, SOIC, SOP, and other package types.
