DM74ALS27 is a triple 3-input NOR gate produced by Fairchild Semiconductor Corporation. It has 50pF switching specifications, guaranteed switching specifications over full temperature and VCC range, and advanced oxide-isolated, ion-implanted Schottky TTL process. It is functionally and pin for pin compatible with Schottky and low power Schottky TTL counterpart, and has improved AC performance over Schottky and low power Schottky counterparts.
The DM74ALS27 is a triple 3‑input NOR gate implemented in an advanced oxide‑isolated, ion‑implanted Schottky TTL process. It is pin‑compatible with standard Schottky TTL devices and offers improved AC performance. The datasheet includes ordering information for the M14A 14‑lead SOIC package and details the connection diagram and logic function table.
Key sections cover absolute maximum ratings, recommended operating conditions, electrical characteristics such as input thresholds and output drive capabilities, propagation delays, and physical dimensions of the SOIC package. The document also contains trademark notices, disclaimer statements, and product status definitions.
| Supply Voltage (VCC) – Recommended | 5 V (4.5 V min, 5.5 V max) |
|---|---|
| Input HIGH Level Voltage | 2 V |
| Input LOW Level Voltage | 0.8 V |
| Output HIGH Level Current | 0.4 mA |
| Output LOW Level Current | 8 mA |
| Operating Temperature Range | 0 °C to 70 °C |
| Storage Temperature Range | -65 °C to +150 °C |
| Typical Thermal Resistance | 116 °C/W |
| Package Type | 14‑Lead Small Outline Integrated Circuit (SOIC), 0.150" narrow |
The recommended supply voltage is 5 V, with a minimum of 4.5 V and a maximum of 5.5 V.
A HIGH input is recognized at 2 V or above, while a LOW input is recognized at 0.8 V or below.
The device can source up to 0.4 mA on a HIGH output and sink up to 8 mA on a LOW output.