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(25) CD4047BE / CD 4047BE, CMOS 4047 TIMERs / ASTABLE MULTIVIBRATORs / MAGNUM NE555 / LM555 LOW-POWER ICs, New old stock (NOS) DIP ICs. Harris Semiconductor 4047 CMOS multivibrator ICs, equivalent to CD4047 / CD4047B, MC14047 / MC14047B, HEF4047 / HEF4047B, HCF4047 / HCF4047B, SGS4047 / SGS4047B, TC4047 / TC4047B and other CMOS timer and multivibrator equivalents. Astable multivibrators often serve as the heartbeat of a circuit, it almost always pays when it is as precise and as versatile as possible. The versatile 8-pin 555-series multivibrator ICs (LM 555 / NE 555) are probably the most popular ICs ever made. Unfortunately, not enough designers know the true power of the 14-pin CD 4047 timer / multivibrator IC! For a measely extra 3-pins on each side, here is the sizzling steak you get when you use the CMOS 4047 over the ground-round of the 555: (1) CMOS low power - on level with CMOS 555 ICs (ICM7555, LMC555, GLC555, LM7555). One big disadvantage with the LM555 is that it produces large crowbar currents in the output driver, resulting in supply current spikes of 300ma to 400ma when it switches, whereas the 4047 produces only 2ma - 3ma current spikes. (2) Much higher bandwidth. 555 is limited to about 300 KHz. With the 4047, you get BW up to about 2 MHz (15+VDC supply). (3) A + Trigger pin as well as a - Trigger pin. 555 has only a - Trigger pin. (4) A Retrigger pin. Zip here for the 555. (5) The normal Output pin plus the Complement Output pin. The 555 has only the normal Output pin. (6) Internal Oscillator Output pin. Zip here for the 555. (7) Two Astable Inputs - one requiring positive voltage, the other requiring negative voltage to trigger Astable operation, else its Monostable. With the 555, to go from Astable to Monostable operation or vice-versa, you have to re-wire the timing circuitry by adding or removing a resistor. With the 4047, the timing circuitry conveniently stays the same; you just simply change the Astable or Not-Astable inputs. For multivibrator versatility, you can't beat the 4047 CMOS. Because of these extra, often critical, advantages over the common 555, the 4047's multivibrator applications are virtually unlimited, and include: (1) Frequency multiplication, (2) Frequency division, (3) Envelope detection (e.g. amplitude modulation - AM demodulation), (4) Frequency discrimination, (5) Timing circuits / Time delay circuits. I use these standard ICs by the ton, but I purchased so many that I am selling some now. ICs come in anti-static tube. LIMITED QUANTITY. Only a few sets left now. ((25) CD4047BE/cd 4047BE,cmos 4047 timers/multivibrators was posted and is owned by: Russell Hewitt) |
russell_hewitt@chicagopartsnetwork.com (Russell Hewitt) for more information.
