4049 Hex Inverting Buffer/Converter

Overview

The 4049 is a hex inverting buffer/converter integrated circuit designed for high-speed logic level conversion and signal buffering. This CMOS-based device is capable of driving two TTL loads directly, making it suitable for interfacing between different logic families. The 4049 features high sink and source current capability, low power consumption, and wide operating voltage ranges, making it a versatile choice for various digital applications.

Manufactured using advanced CMOS technology, the 4049 offers excellent noise immunity and reliable performance across extended temperature ranges. The device is fully compliant with JEDEC Tentative Standard No. 13A, ensuring compatibility with industry specifications for B-series CMOS devices.

Key Features

• High sink current capability for driving two TTL loads
• High-to-low level logic conversion functionality
• Low quiescent current (specified up to 20V for HCC devices)
• Exceptional sink and source current handling
• Multiple parametric ratings (5V, 10V, and 15V operation)
• Ultra-low input current (100nA at 18V and 25°C for HCC devices)
• 100% tested for quiescent current compliance
• JEDEC Standard No. 13A compliant
• Extended temperature range operation available
• Wide supply voltage range: 3V to 18V
• Balanced propagation delays
• High noise immunity: 0.45 VDD (typical)

Applications

The 4049 hex inverting buffer/converter finds application in numerous digital systems, including:

• Logic level shifting between different voltage domains
• TTL to CMOS interface circuits
• CMOS to CMOS voltage translation
• Signal buffering and isolation
• Waveform shaping and signal conditioning
• Clock distribution networks
• Bus driver applications
• Microprocessor interfacing
• Industrial control systems
• Automotive electronics
• Consumer electronics
• Power management systems

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.5V to +20V
• Input Voltage (VIN): -0.5V to VDD + 0.5V
• DC Input Current (IIN): ±10mA
• Storage Temperature Range: -65°C to +150°C
• Power Dissipation (PD): 500mW

Recommended Operating Conditions

• Supply Voltage Range (VDD): 3V to 18V
• Input Voltage Range (VIN): 0V to VDD
• Operating Temperature Range:
  • Standard: -40°C to +85°C
  • Extended (HCC): -55°C to +125°C

DC Characteristics

• Input Leakage Current (II): 100nA max at 18V, 25°C
• Quiescent Current (IDD): 1μA max at 18V, 25°C
• Output Drive Current (IO):
  • Sink: 6.8mA min at 5V, 25°C
  • Source: 1.5mA min at 5V, 25°C
• Input Capacitance (CIN): 7.5pF typical

AC Characteristics

• Propagation Delay (tPLH, tPHL): 90ns typical at 10V, 25°C
• Transition Time (tTLH, tTHL): 60ns typical at 10V, 25°C
• Maximum Clock Frequency (fMAX): 8MHz typical at 10V

Package Information

The 4049 is available in multiple package options to suit various application requirements:

Standard Package Options

• 16-pin PDIP (Plastic Dual In-line Package)
  • Body Size: 19.3mm x 6.35mm
  • Lead Pitch: 2.54mm
• 16-pin SOIC (Small Outline Integrated Circuit)
  • Body Size: 9.9mm x 3.9mm
  • Lead Pitch: 1.27mm
• 16-pin TSSOP (Thin Shrink Small Outline Package)
  • Body Size: 5mm x 4.4mm
  • Lead Pitch: 0.65mm

Thermal Characteristics

• PDIP Thermal Resistance (θJA): 80°C/W
• SOIC Thermal Resistance (θJA): 160°C/W
• TSSOP Thermal Resistance (θJA): 240°C/W

Functional Description

The 4049 contains six independent inverting buffer/converter circuits. Each channel features a CMOS input stage followed by a high-current output driver capable of sinking significant current for TTL compatibility. The device performs true logic inversion, with a high input resulting in a low output and vice versa.

The input stage is designed with protection diodes to prevent damage from electrostatic discharge (ESD) and transient voltage spikes. The output stage uses complementary MOSFET pairs to provide both sink and source current capability, with the sink current being particularly robust for driving TTL inputs.

Design Considerations

Power Supply Decoupling

Proper power supply decoupling is essential for optimal performance. A 0.1μF ceramic capacitor should be placed as close as possible to the VDD and VSS pins to minimize noise and ensure stable operation.

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.

Output Loading

While the 4049 can drive two standard TTL loads, care should be taken not to exceed the maximum output current specifications, especially when driving capacitive loads. For heavy capacitive loads (>50pF), series resistors may be needed to limit peak currents.

Voltage Translation

When used for voltage level translation, ensure that the input signal levels are within the specified input voltage range for the given supply voltage. The 4049 can translate signals from higher voltage domains to lower voltage domains while maintaining proper logic levels.

Reliability and Quality

The 4049 is manufactured using stringent quality control processes and undergoes 100% testing for quiescent current and other key parameters. The device is qualified to meet or exceed industry standards for reliability, including:

• JEDEC JESD22-A104 Temperature Cycling
• JESD22-A101 Steady-State Temperature Humidity Bias Life Test
• JESD22-A105 High Temperature Storage Life
• ESD Protection: HBM Class 2 (2000V min)

Ordering Information

The device is available in various temperature grades and package options with the following ordering codes:

• 4049UB: Standard temperature range (-40°C to +85°C)
• HCC4049UB: Extended temperature range (-55°C to +125°C)
• 4049UBE: PDIP package
• 4049UBM: SOIC package
• 4049UBMT: TSSOP package