CD40175B Technical Summary

CD40175B - Quad D-Type Flip-Flop with Complementary Outputs

Overview

The CD40175B is a monolithic complementary MOS (CMOS) integrated circuit constructed with N- and P-channel enhancement mode transistors. It consists of four positive-edge triggered D-type flip-flops with both true (Q) and complement (Q̅) outputs available for each flip-flop. All flip-flops are controlled by a common clock (CLK) and a common clear (CLR) input. The device features wide operating voltage range, high noise immunity, and low power consumption typical of CMOS technology.

The CD40175B is part of the CD4000 series of CMOS logic ICs and is pin-compatible with many standard logic functions. It is available in multiple package options including PDIP, SOIC, and TSSOP.

Key Features

Quad D-type flip-flops with complementary outputs
Positive-edge triggered clocking
Common clock and clear for all flip-flops
Wide supply voltage range: 3V to 15V
High noise immunity: 0.45 V_DD (typical)
Low power consumption: 10 nW (typical) at 5V
TTL compatible inputs
Standardized symmetrical output characteristics
5V, 10V, and 15V parametric ratings
Input protection diodes on all inputs
Meets all requirements of JEDEC Tentative Standard No. 13B

Applications

The CD40175B is suitable for a wide range of digital logic applications including:

Data registers
Storage registers
Buffer storage
General digital logic circuits
Control circuits
State machine implementation
Bus interfacing
Data synchronization
Frequency division
Pattern generators

Electrical Characteristics

Absolute Maximum Ratings

Supply Voltage (V_DD): -0.5V to +18V
Input Voltage (V_IN): -0.5V to V_DD + 0.5V
Storage Temperature Range: -65°C to +150°C
Power Dissipation: 500 mW
Lead Temperature (Soldering, 10 seconds): 260°C

Recommended Operating Conditions

Supply Voltage Range: 3V to 15V
Input Voltage Range: 0V to V_DD
Operating Temperature Range: -55°C to +125°C

DC Electrical Characteristics (V_DD = 5V, T_A = 25°C)

High-Level Output Voltage (V_OH): 4.95V (min)
Low-Level Output Voltage (V_OL): 0.05V (max)
Input Leakage Current (I_IN): ±0.1 μA (max)
Quiescent Device Current (I_DD): 1 μA (max)

AC Electrical Characteristics (V_DD = 5V, T_A = 25°C)

Propagation Delay Time (CLK to Q): 200 ns (max)
Setup Time (D to CLK): 60 ns (min)
Hold Time (D after CLK): 0 ns (min)
Clock Pulse Width: 100 ns (min)
Clear Pulse Width: 100 ns (min)
Maximum Clock Frequency: 5 MHz (typ)

Functional Description

The CD40175B contains four independent D-type flip-flops that share common clock and clear inputs. Each flip-flop has a data input (D), a true output (Q), and a complementary output (Q̅). The state of each flip-flop is determined by the data present at its D input during the positive-going transition of the clock pulse. The clear input, when taken low, overrides the clock and data inputs and resets all Q outputs low and all Q̅ outputs high.

The truth table for the CD40175B is as follows:

Clear (CLR) = Low: Q = Low, Q̅ = High (regardless of CLK or D)
Clear (CLR) = High, CLK rising edge: Q = D, Q̅ = D̅
Clear (CLR) = High, CLK static: Q and Q̅ maintain previous state

Package Information

Available Packages

16-Lead PDIP (Plastic Dual In-line Package) - 0.300" wide
16-Lead SOIC (Small Outline Integrated Circuit) - 0.154" wide
16-Lead TSSOP (Thin Shrink Small Outline Package)

Pin Configuration (PDIP/SOIC/TSSOP)

Pin 1: Q1 (Flip-Flop 1 True Output)
Pin 2: Q̅1 (Flip-Flop 1 Complementary Output)
Pin 3: D1 (Flip-Flop 1 Data Input)
Pin 4: D2 (Flip-Flop 2 Data Input)
Pin 5: Q̅2 (Flip-Flop 2 Complementary Output)
Pin 6: Q2 (Flip-Flop 2 True Output)
Pin 7: Q̅3 (Flip-Flop 3 Complementary Output)
Pin 8: Q3 (Flip-Flop 3 True Output)
Pin 9: D3 (Flip-Flop 3 Data Input)
Pin 10: D4 (Flip-Flop 4 Data Input)
Pin 11: Q̅4 (Flip-Flop 4 Complementary Output)
Pin 12: Q4 (Flip-Flop 4 True Output)
Pin 13: CLK (Common Clock Input)
Pin 14: CLR (Common Clear Input, active low)
Pin 15: VSS (Ground)
Pin 16: VDD (Positive Supply Voltage)

Design Considerations

Power Supply Decoupling

A 0.1 μF ceramic capacitor should be connected between V_DD and V_SS pins, located as close to the IC as possible to minimize noise and voltage fluctuations.

Unused Inputs

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.