CD4528B Dual Monostable Multivibrator

Overview

The CD4528B is a dual monostable multivibrator integrated circuit designed for precision timing applications. Each device within the package is independently retriggerable and resettable, providing flexible pulse generation capabilities. The CD4528B can be triggered from either the rising or falling edge of an input pulse, allowing for versatile operation in various digital systems. The output pulse width is determined by external timing components, enabling precise control over timing intervals.

This CMOS device operates over a wide voltage range and features low power consumption, making it suitable for battery-powered applications. The CD4528B is particularly useful in applications requiring accurate pulse generation, time delay circuits, and sequential timing operations.

Features

• Wide supply voltage range: 3.0V to 18V
• Dual monostable multivibrator in single package
• Separate reset input for each multivibrator
• Extremely low quiescent current: 5.0 nA/package (typical) at 5.0 VDC
• Input diode protection on all inputs
• Triggerable from either leading or trailing edge pulses
• Capable of driving two low-power TTL loads or one low-power Schottky load
• Retriggerable operation for extended pulse width
• Symmetrical output characteristics
• Standardized symmetrical output characteristics
• 100% tested for quiescent current at 20V

Applications

The CD4528B finds application in a wide range of electronic systems requiring precise timing control:

• Precision timing circuits
• Pulse width modulation systems
• Time delay generation
• Sequential timing systems
• Frequency division circuits
• Waveform generation
• Digital filtering systems
• Industrial control systems
• Automotive electronics
• Consumer electronics timing applications
• Communication system timing

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage Range (VDD): -0.5V to +18V
• Input Voltage Range (VIN): -0.5V to VDD + 0.5V
• DC Input Current (per pin): ±10mA
• Power Dissipation (PD): 500mW
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage Range: 3V to 18V
• Input High Voltage (VIH): 70% of VDD (min)
• Input Low Voltage (VIL): 30% of VDD (max)
• Operating Temperature Range: -40°C to +85°C

DC Electrical Characteristics

• Quiescent Device Current (IDD): 5nA typical at 5V
• Input Leakage Current (IIN): ±100nA maximum at 18V
• Output High Voltage (VOH): VDD - 0.05V (min) at 10V supply
• Output Low Voltage (VOL): 0.05V (max) at 10V supply

AC Electrical Characteristics

• Propagation Delay Time (tPHL, tPLH): 300ns typical at 10V
• Output Transition Time (tTHL, tTLH): 150ns typical at 10V
• Minimum Input Pulse Width: 100ns at 10V
• Maximum Input Clock Frequency: 3MHz at 10V

Package Information

The CD4528B is available in multiple package options to suit various application requirements:

16-Pin Plastic Dual In-Line Package (PDIP)

• Package Code: D
• Package Dimensions: 19.3mm x 6.35mm
• Lead Pitch: 2.54mm
• Mounting Style: Through-hole
• Operating Temperature Range: -55°C to +125°C

16-Pin Small Outline Package (SOIC)

• Package Code: DW
• Package Dimensions: 9.9mm x 3.9mm
• Lead Pitch: 1.27mm
• Mounting Style: Surface Mount
• Operating Temperature Range: -40°C to +85°C

16-Pin Shrink Small Outline Package (SSOP)

• Package Code: DBQ
• Package Dimensions: 4.9mm x 3.9mm
• Lead Pitch: 0.635mm
• Mounting Style: Surface Mount
• Operating Temperature Range: -40°C to +85°C

Functional Description

The CD4528B consists of two independent monostable multivibrators with complementary outputs (Q and Q̅). Each multivibrator features three trigger inputs (A, B, and C) and a reset input (R). The device can be triggered by either a positive-going transition (using inputs A and B) or a negative-going transition (using input C).

The output pulse width (tw) is determined by the external timing components (resistor and capacitor) connected to the RCx pins. The relationship between the timing components and output pulse width is given by the formula:

tw ≈ 0.7 × R × C

where R is in ohms and C is in farads.

The device features retrigger capability, allowing the output pulse to be extended by applying subsequent trigger pulses during the active output period. A logic high on the reset input (R) immediately terminates the output pulse, providing precise control over the timing operation.

Design Considerations

When designing with the CD4528B, several factors should be considered:

• For stable operation, keep timing capacitor leads as short as possible
• Use high-quality, stable timing components for precise timing
• Bypass the power supply with a 0.1μF capacitor close to the device
• Unused inputs should be tied to VDD or ground as appropriate
• For very long time delays, consider using a low-leakage timing capacitor
• Ensure trigger pulse width meets minimum specifications

Ordering Information

The CD4528B is available in various package options with different temperature ranges. The complete ordering information includes:

• CD4528BE: PDIP package, military temperature range (-55°C to +125°C)
• CD4528BPW: TSSOP package, industrial temperature range (-40°C to +85°C)
• CD4528BMT: SOIC package, industrial temperature range (-40°C to +85°C)
• CD4528BNSR: SOIC package, tape and reel packaging