The document describes the features and characteristics of Harris Semiconductor SCHS131B, including buffered inputs, propagation delay, fanout, operating temperature range, power reduction, and logic compatibility.
The CD54HC21, CD74HC21 and CD74HCT21 are high‑speed CMOS dual 4‑input AND gates offered in CERDIP, PDIP and SOIC packages. They provide buffered inputs, low power consumption and are compatible with standard LSTTL loads.
The document lists electrical characteristics such as a typical propagation delay of 9 ns, fan‑out of 10 LSTTL loads, operating temperature range from –55 °C to 125 °C, and supply voltage ranges of 2 V‑6 V (HC) or 4.5 V‑5.5 V (HCT). Mechanical drawings for the various package styles and handling cautions are also included.
| Typical Propagation Delay | 9 ns at Vcc = 5 V, CL = 15 pF, Ta = 25 °C |
|---|---|
| Fan‑out (Standard Outputs) | 10 LSTTL loads |
| Operating Temperature Range | -55 °C to 125 °C |
The typical propagation delay is 9 ns at Vcc = 5 V, CL = 15 pF and Ta = 25 °C.
Standard outputs can drive up to 10 LSTTL loads.
The device operates from –55 °C to 125 °C.