4098 Datasheet | Next Electromics

Technical Summary: HCC/HCF4098B Dual Monostable Multivibrator

Overview

The HCC4098B and HCF4098B are dual monostable multivibrators from the "B" series of CMOS devices, designed for precision timing applications. These devices operate over extended (HCC) and intermediate (HCF) temperature ranges, making them suitable for industrial and commercial environments. Each IC contains two independent monostable circuits that can be triggered by either the positive or negative edge of an input pulse, with output pulse widths determined by external resistors and capacitors.

Manufactured with high-voltage silicon-gate CMOS technology, these devices offer low power consumption, high noise immunity, and compatibility with TTL inputs when operated at VDD = 5V. The 4098B series provides improved performance over earlier versions with standardized symmetry control and retriggerable/non-retriggerable operation modes.

Key Features

Dual monostable multivibrator in single package
Separate trigger inputs for positive or negative edge triggering
Retriggerable/non-retriggerable operation selectable per channel
Output pulse width programmable via external RC components
Wide operating voltage range: 3V to 18V
High noise immunity: 0.45 VDD (typ.)
Low power consumption: 1μA (max.) at TA=25°C
Symmetrical output characteristics
TTL compatible inputs at VDD = 5V
HCC version: -40°C to +125°C temperature range
HCF version: -40°C to +85°C temperature range

Applications

The 4098B dual monostable multivibrator finds use in numerous timing and pulse generation applications including:

Precision timing circuits
Pulse width modulation
Frequency division
Time delay generation
Missing pulse detection
Envelope detection
Waveform generation
Industrial control systems
Automotive electronics
Consumer electronics timing functions

Electrical Characteristics

All specifications are typical at VDD = 10V and TA = 25°C unless otherwise noted.

DC Characteristics

Supply Voltage Range: 3V to 18V
Input Voltage Range: 0V to VDD
High Level Input Voltage: 0.7 VDD (min)
Low Level Input Voltage: 0.3 VDD (max)
Output Drive Current: ±4mA at VDD = 10V
Quiescent Current: 1μA (max) at 18V

AC Characteristics

Propagation Delay: 250ns (typ) from trigger to output
Transition Time: 150ns (typ) for output rise/fall
Maximum Clock Frequency: 8MHz (typ) at VDD = 10V
Trigger Pulse Width: 100ns (min)

Timing Characteristics

Output Pulse Width Range: 30ns to ∞
Pulse Width Accuracy: ±0.2% (typ) with stable components
Temperature Coefficient: 0.005%/°C (typ)
Supply Voltage Coefficient: 0.1%/V (typ)

Functional Description

The HCC/HCF4098B contains two independent monostable multivibrators, each featuring:

Positive-edge trigger input (TR+)
Negative-edge trigger input (TR-)
Retrigger/non-retrigger control input (RET)
Direct reset input (R)
Complementary outputs (Q and Q)
External timing component connections (RC, CX)

Each monostable can be triggered by either the positive or negative transition of an input pulse. The RET input determines whether the device operates in retriggerable mode (RET = "1") where the output pulse can be extended by subsequent triggers, or non-retriggerable mode (RET = "0") where triggers during an active pulse are ignored.

The output pulse width is determined by the external resistor (R) and capacitor (C) values according to the approximate formula: tW ≈ 0.7RC. Precision metal film resistors and stable capacitors (such as polystyrene or polypropylene) are recommended for accurate timing.