This data sheet lists the features and characteristics of CD54HC123, CD54HCT123, CD74HC123, CD74HCT123, CD74HC423, CD74HCT423.
The CD54/74HC123, CD54/74HCT123, CD74HC423 and CD74HCT423 are high‑speed CMOS logic ICs that provide dual retriggerable monostable multivibrator functions with independent reset inputs. They support both leading‑edge and trailing‑edge triggering, buffered Q and Q̅ outputs, and a wide range of output‑pulse widths controlled by external resistor (Rx) and capacitor (Cx) values.
The devices operate over a temperature range of –55 °C to 125 °C and are supplied from 2 V‑6 V (HC types) or 4.5 V‑5.5 V (HCT types). Electrical specifications include typical propagation delays of 50‑300 ns, output‑pulse widths from a few microseconds up to tens of microseconds, and low power consumption compared with LSTTL logic families. Package options include 16‑lead CERDIP, PDIP and SOIC.
| Supply Voltage Range (HC types) | 2 V to 6 V |
|---|---|
| Supply Voltage Range (HCT types) | 4.5 V to 5.5 V |
| Operating Temperature Range | -55 °C to 125 °C |
| Minimum External Resistance (Rx) | 5 kΩ |
The minimum external resistance (Rx) is typically 5 kΩ.
HC type parts operate from 2 V to 6 V.
They are rated for –55 °C to 125 °C.
Yes, the output pulse width can be extended by retriggering inputs A or B.