Technical Summary: HCC4070B Quad Exclusive-OR Gate

Overview

The HCC4070B is a quad exclusive-OR (XOR) gate integrated circuit belonging to the 4000 series CMOS logic family. This device provides four independent XOR gates in a single package, offering medium-speed operation with typical propagation delays of 70ns at 10V supply voltage. Designed for general-purpose logic applications, the HCC4070B features wide operating voltage range, low power consumption, and high noise immunity characteristic of CMOS technology.

The component is particularly suitable for applications requiring exclusive-OR logic functions such as comparators, parity generators/checkers, and controlled inverters. The extended temperature range version (HCC prefix) makes it appropriate for industrial environments.

Features

• Medium-speed operation: t_PHL = t_PLH = 70ns (typical) at V_CC = 10V, C_L = 50pF
• Wide supply voltage range: 3V to 20V (HCC device)
• Low quiescent current specified up to 20V for HCC device
• Multiple parametric ratings: 5V, 10V and 15V operation
• Exceptionally low input current: 100nA maximum at 18V and 25°C for HCC device
• 100% tested for quiescent current
• Complies with JEDEC Tentative Standard No. 13A for "B" series CMOS devices
• High noise immunity: 0.45 V_DD (typical)
• Symmetric output drive capability
• Buffered inputs and outputs

Applications

The HCC4070B finds use in numerous digital logic applications including:

• Binary comparators and magnitude detectors
• Parity generators and checkers for error detection
• Controlled inverters in signal processing
• Adders and arithmetic logic units
• Phase comparators in PLL circuits
• Frequency doubling circuits
• Data encryption systems
• Error detection and correction systems
• Industrial control systems
• Automotive electronics

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_DD): -0.5V to +22V
• Input Voltage (V_IN): -0.5V to V_DD + 0.5V
• DC Input Current (I_IN): ±10mA
• Power Dissipation (P_D): 200mW
• Operating Temperature Range (T_A):
  • Standard: -40°C to +85°C
  • Extended (HCC): -55°C to +125°C
• Storage Temperature Range (T_STG): -65°C to +150°C

DC Electrical Characteristics

(V_DD = 5V ±10%, T_A = 25°C unless otherwise specified)

• High-Level Output Voltage (V_OH): 4.95V (min) at I_OH = -0.4mA
• Low-Level Output Voltage (V_OL): 0.05V (max) at I_OL = 0.4mA
• Input Leakage Current (I_IN): ±100nA (max) at V_DD = 18V
• Quiescent Supply Current (I_DD): 1μA (max) at V_DD = 20V

AC Electrical Characteristics

(V_DD = 10V, C_L = 50pF, T_A = 25°C)

• Propagation Delay Time (t_PHL, t_PLH): 70ns (typical), 200ns (max)
• Transition Time (t_THL, t_TLH): 60ns (typical), 150ns (max)
• Maximum Clock Frequency (f_CLK): 8MHz (typical)
• Input Capacitance (C_IN): 7.5pF (typical)

Package Information

Available Packages

• 14-pin Plastic Dual In-line Package (PDIP)
• 14-pin Small Outline Package (SOP)
• 14-pin Thin Shrink Small Outline Package (TSSOP)

Pin Configuration

The HCC4070B features the following pinout:

• Pin 1: XOR Gate 1 Input A
• Pin 2: XOR Gate 1 Input B
• Pin 3: XOR Gate 1 Output
• Pin 4: XOR Gate 2 Output
• Pin 5: XOR Gate 2 Input A
• Pin 6: XOR Gate 2 Input B
• Pin 7: V_SS (Ground)
• Pin 8: XOR Gate 3 Input A
• Pin 9: XOR Gate 3 Input B
• Pin 10: XOR Gate 3 Output
• Pin 11: XOR Gate 4 Output
• Pin 12: XOR Gate 4 Input A
• Pin 13: XOR Gate 4 Input B
• Pin 14: V_DD (Positive Supply)

Package Dimensions

For the 14-pin PDIP package:

• Package Length: 19.3mm (max)
• Package Width: 6.35mm (max)
• Lead Pitch: 2.54mm
• Body Thickness: 4.57mm (max)

Design Considerations

Power Supply Decoupling

For optimal performance, a 0.1μF ceramic capacitor should be connected between V_DD and V_SS pins, placed as close to the IC as possible. This helps minimize noise and voltage fluctuations.

Unused Input Handling

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

Output Loading

The output drive capability is limited to approximately 1mA at 5V supply. For driving higher currents or capacitive loads, external buffers should be used.

ESD Protection

While the device includes internal ESD protection, proper handling procedures should still be followed to prevent electrostatic discharge damage during assembly and maintenance.

Reliability Information

• MTBF (Mean Time Between Failures): >1,000,000 hours at 25°C
• ESD Protection: >2000V (Human Body Model)
• Latch-up Immunity: Exceeds 100mA

Environmental Compliance

The HCC4070B is available in lead-free (RoHS compliant) and non-lead-free versions. The device is halogen-free and meets the requirements of:

• RoHS Directive 2011/65/EU
• REACH Regulation EC 1907/2006