CD4049

CD4049 Hex Inverting Buffer/Converter Technical Summary

Overview

The CD4049UBC is a monolithic complementary MOS (CMOS) integrated circuit that provides six independent inverting buffer/converter circuits in a single package. As part of the 4000-series CMOS family, it features wide operating voltage range, high noise immunity, and low power consumption typical of CMOS technology. The device is capable of converting logic levels from higher to lower voltages, making it particularly useful in mixed-voltage systems.

This hex inverting buffer is designed with special input protection that allows input voltages to exceed the VDD supply voltage, a unique feature that enhances its versatility in various applications. The outputs can source or sink significant current relative to other CMOS devices, enabling direct drive of TTL loads and other demanding applications.

Key Features

• Wide supply voltage range: 3.0V to 15V operation enables use in diverse systems
• TTL compatibility: Can directly drive 2 TTL loads at 5.0V across full temperature range
• High current capability: Excellent source and sink current capacity for a CMOS device
• Input protection: Special circuitry permits input voltages greater than VDD without damage
• Low power consumption: Typical quiescent current of just 1μA at 5VDD and 25°C
• Balanced propagation delays: Typical tPHL and tPLH of 60ns at 10VDD
• High noise immunity: 0.45 VDD (typical) noise margin
• Standardized symmetrical output characteristics
• Buffered inputs and outputs

Applications

The CD4049 finds use in a wide variety of digital and mixed-signal applications including:

• Logic level conversion and shifting
• CMOS to TTL or DTL interface circuits
• Power supply voltage translation
• Signal buffering and isolation
• Waveform generation and shaping
• LED and lamp drivers
• Relay and solenoid drivers
• Clock pulse shaping
• Custom logic implementations
• Bus-oriented systems

Electrical Characteristics

All values typical at 25°C unless otherwise specified.

DC Characteristics

• Supply Voltage Range: 3V to 15V
• Input Voltage Range: -0.5V to VDD + 0.5V (protected)
• Input Current (VI = 18V, VDD = 10V): ±0.1μA max
• Quiescent Current (VDD = 5V): 1μA typical
• Output Drive Current (VDD = 5V):
  • Source: 0.88mA min
  • Sink: 3.2mA min
• Output Drive Current (VDD = 10V):
  • Source: 2.25mA min
  • Sink: 8.8mA min
• Input Capacitance: 7.5pF typical

AC Characteristics (VDD = 10V)

• Propagation Delay (CL = 50pF, RL = 200kΩ):
  • tPHL: 60ns typical
  • tPLH: 60ns typical
• Transition Time (CL = 50pF, RL = 200kΩ):
  • tTHL: 75ns typical
  • tTLH: 75ns typical
• Maximum Clock Frequency: 8MHz typical

Package Information

The CD4049 is available in multiple package options to suit different assembly requirements:

Standard Package Options

• 16-Pin Plastic Dual In-Line Package (PDIP):
  • JEDEC MS-001BA compliant
  • Body dimensions: 19.3mm x 6.35mm
  • Lead pitch: 2.54mm
  • Operating temperature: -55°C to +125°C
• 16-Pin Small Outline Package (SOIC):
  • JEDEC MS-013AA compliant
  • Body dimensions: 9.9mm x 3.9mm
  • Lead pitch: 1.27mm
  • Operating temperature: -55°C to +125°C
• 16-Pin Ceramic Dual In-Line Package (CDIP):
  • MIL-STD-1835 compliant
  • Body dimensions: 21.34mm x 7.62mm
  • Lead pitch: 2.54mm
  • Operating temperature: -55°C to +125°C

Pin Configuration

The 16-pin packages share the following pinout:

• Pin 1: Input A
• Pin 2: Output A
• Pin 3: Input B
• Pin 4: Output B
• Pin 5: Input C
• Pin 6: Output C
• Pin 7: VSS (Ground)
• Pin 8: Output D
• Pin 9: Input D
• Pin 10: Output E
• Pin 11: Input E
• Pin 12: Output F
• Pin 13: Input F
• Pin 14: VDD (Positive Supply)
• Pins 15, 16: No Connection

Design Considerations

When implementing the CD4049 in circuit designs, several factors should be considered:

Power Supply Decoupling

A 0.1μF ceramic capacitor should be placed as close as possible between VDD and VSS pins to minimize noise and ensure stable operation, especially in high-speed or noisy environments.

Unused Inputs

All unused inputs must be tied to either VDD or VSS to prevent floating input conditions that could lead to excessive power consumption or erratic operation.

Thermal Management

While the CD4049 has relatively low power dissipation, designs driving heavy loads at maximum supply voltages should consider power dissipation and potential need for heat sinking in high-temperature environments.

Input Protection

The special input protection allows input signals to exceed VDD, but care should be taken not to exceed absolute maximum ratings (typically VDD + 0.5V) to prevent potential device damage.

Reliability and Quality

The CD4049 meets or exceeds the following reliability standards:

• MIL-STD-883 Method 3015 (ESD protection)
• JEDEC JESD22-A114 (ESD sensitivity testing)
• JEDEC JESD78 (latch-up testing)
• Industrial temperature range (-40°C to +85°C) available
• Military temperature range (-55°C to +125°C) available

Alternative Devices

For applications requiring different features or performance, consider these alternatives:

• CD4050: Hex non-inverting buffer with similar characteristics
• 74HC4049: High-speed CMOS version with improved performance
• CD40106: Hex inverting Schmitt trigger for noisy environments
• 74LS04