4043 - HCC4043B/HCC4044B CMOS Quad R/S Latch Technical Summary

Overview

The HCC4043B and HCC4044B are quad cross-coupled 3-state NOR/NAND R/S latches from the "B" series of high-speed CMOS devices. These integrated circuits provide four independent set/reset latch functions in a single package, making them ideal for applications requiring simple memory storage or signal latching. Manufactured using advanced silicon-gate CMOS technology, these devices offer the low power consumption typical of CMOS while providing improved speed over standard 4000-series parts.

The primary difference between the HCC4043B and HCC4044B lies in their logic implementation: the HCC4043B features NOR-based latches while the HCC4044B uses NAND-based latches. Both versions feature three-state outputs that can be switched to a high-impedance state, allowing for bus-oriented applications.

Key Features

• Quad set/reset latch in single package (4 latches per IC)
• Available in NOR (HCC4043B) and NAND (HCC4044B) configurations
• Three-state output capability for bus-oriented applications
• Wide supply voltage range: 3V to 18V DC
• Low power consumption: typically 10nW per latch at 5V
• High noise immunity: 0.45 VDD (typ.)
• Symmetric output drive capability: source/sink 6.8mA at 15V
• Extended temperature range: -40°C to +125°C
• Compatible with standard CMOS outputs
• Balanced propagation delays
• Standardized symmetrical output characteristics

Applications

The HCC4043B/HCC4044B latches find use in numerous digital applications including:

• General purpose digital logic systems
• Temporary data storage registers
• Bus interface circuits
• Input/output port expansion
• Debounce circuits for mechanical switches
• Control logic for power management
• State machine implementation
• Signal conditioning circuits
• Industrial control systems
• Automotive electronics

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VDD): -0.5V to +20V
• Input Voltage (VIN): -0.5V to VDD +0.5V
• Output Voltage (VOUT): -0.5V to VDD +0.5V
• Input Current (IIN): ±10mA
• Operating Temperature Range: -40°C to +125°C
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (VDD = 10V, TA = 25°C unless specified)

• High Level Output Voltage: 9.95V (min) @ IOUT = -1.0μA
• Low Level Output Voltage: 0.05V (max) @ IOUT = 1.0μA
• Input Leakage Current: ±0.1μA (max) @ VIN = 0V to 18V
• Quiescent Device Current: 1.0μA (max) @ VIN = VDD or GND
• Output Drive Current: ±6.8mA (min) @ VDD = 15V

AC Characteristics (VDD = 10V, TA = 25°C unless specified)

• Propagation Delay (Set to Q): 120ns (max)
• Propagation Delay (Reset to Q): 120ns (max)
• Propagation Delay (Enable to Q): 120ns (max)
• Output Transition Time: 60ns (max)
• Input Capacitance: 7.5pF (typ)

Functional Description

Each of the four latches in the HCC4043B/HCC4044B operates as a basic set/reset flip-flop with three-state output control. The HCC4043B (NOR version) features active-high set and reset inputs, while the HCC4044B (NAND version) uses active-low inputs. Both versions include an active-low enable input that controls all four output buffers simultaneously.

When the enable input is active (low for HCC4043B, high for HCC4044B), the outputs reflect the current state of their respective latches. When disabled, the outputs enter a high-impedance state, allowing multiple devices to share a common bus without contention.

Package Information

Available Packages

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

Package Dimensions (16-pin DIP)

• Overall Length: 19.3mm (max)
• Overall Width: 6.35mm (max)
• Lead Pitch: 2.54mm
• Body Thickness: 3.3mm (max)
• Lead Length: 3.3mm (min)

Pin Configuration

• Pin 1: Q1 (Latch 1 Output)
• Pin 2: Q2 (Latch 2 Output)
• Pin 3: Q3 (Latch 3 Output)
• Pin 4: Q4 (Latch 4 Output)
• Pin 5: S4 (Latch 4 Set Input)
• Pin 6: R4 (Latch 4 Reset Input)
• Pin 7: S3 (Latch 3 Set Input)
• Pin 8: R3 (Latch 3 Reset Input)
• Pin 9: Enable (Common Output Enable)
• Pin 10: VSS (Ground)
• Pin 11: R2 (Latch 2 Reset Input)
• Pin 12: S2 (Latch 2 Set Input)
• Pin 13: R1 (Latch 1 Reset Input)
• Pin 14: S1 (Latch 1 Set Input)
• Pin 15: NC (No Connection)
• Pin 16: VDD (Positive Supply)

Recommended Operating Conditions

• Supply Voltage Range: 3V to 18V
• Input Voltage Range: 0V to VDD
• Operating Temperature Range: -40°C to +125°C
• Input Rise/Fall Time: 15μs (max) @ VDD = 5V, 5μs (max) @ VDD = 10V, 3μs (max) @ VDD = 15V

Reliability Information

• ESD Protection: >2000V (Human Body Model)
• Latch-up Performance: >250mA
• Moist