HEF4047B
Monostable/astable multivibrator
Rev. 6 — 17 March 2017 Product data sheet
1 General description
The HEF4047B is a retriggerable astable multivibrator that can be configured as either
a positive-edge or negative-edge triggered monostable multivibrator. The output pulse
width is programmed by selection of external components (R
t
and C
t
). Inputs include
clamp diodes. This enables the use of current limiting resistors to interface inputs to
voltages in excess of V
CC
.
2 Features and benefits
2.1 General
• Monostable (one-shot) or astable (free-running) operation
• True and complemented buffered outputs
• Only one external resistor and capacitor required
2.2 Monostable multivibrator
• Positive- or negative-edge triggering
• Output pulse width independent of trigger pulse duration
• Retriggerable option for pulse-width expansion
• Long pulse width possible using small RC components with external counter provision
• Fast recovery time independent of pulse width
• Pulse-width accuracy maintained at duty cycles approaching 100%
2.3 Astable multivibrator
• Free-running or gatable operating modes
• 50% duty cycle
• Oscillator output available
3 Ordering information
Table 1. Ordering information
PackageType number
Name Description Version
HEF4047BT SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
