HEF4047BT,653

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 and C ). Inputs include t t 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 Type number Package Name Description Version HEF4047BT SO14 plastic small outline package 14 leads body width 3.9 mm SOT108-1Nexperia HEF4047B Monostable/astable multivibrator 4 Functional diagram R t C t RCTC CTC RTC 3 1 2 13 OSCILLATOR OUTPUT 5 ASTABLE ASTABLE 12 RETRIGGER GATE RETRIGGER CONTROL 4 CONTROL ASTABLE ASTABLE MULTI- VIBRATOR 10 6 O - TRIGGER FREQUENCY MONOSTABLE DIVIDER CONTROL ( 2) 8 11 + TRIGGER O 9 MR aaa-013282 Figure 1. Functional diagram V DD (1) ASTABLE RCTC ASTABLE + TRIGGER - TRIGGER CTC D O RTC FF 1 CP OSCILLATOR OUTPUT C C D D S S D D V D O D O D O O SS FF FF FF 2 3 4 RETRIGGER CP CP CP O O O O C C C C D D D D MR aaa-013284 (1) Special input protection that allows operating input voltages outside the supply voltage lines. Compared to the standard inputprotection pin 3 (RCTC) is more sensitive to static discharge extra handling precautions are recommended. Figure 2. Logic diagram HEF4047B All information provided in this document is subject to legal disclaimers. Nexperia B.V. 2017. All rights reserved. Product data sheet Rev. 6 17 March 2017 2 / 22