74LS48 BCD to 7-Segment Decoder / Driver (For Common Cathode) - 7448

The SN54 /74LS48 is a BCD to 7-Segment Decoder consisting of NAND gates, input buffers and seven AND-OR-INVERT gates. Seven NAND gates and one driver are connected in pairs to make BCD data and its complement available to the seven decoding AND-OR-INVERT gates. The remaining NAND gate and three input buffers provide lamp test, blanking input/ripple blanking input for the LS48. The circuit accepts 4-bit binary-coded-decimal (BCD) and, depending on the state of the auxiliary inputs, decodes this data to drive other components. The relative positive logic output levels, as well as conditions required at the auxiliary inputs, are shown in the truth tables. The LS48 circuit incorporates automatic leading and/or trailing edge zero-blanking control (RBI and RBO). Lamp Test (LT) may be activated at any time when the BI/RBO node is HIGH. Both devices contain an overriding blanking input (BI) which can be used to control the lamp intensity by varying the frequency and duty cycle of the BI input signal or to inhibit the outputs.

Features

• Active high outputs (for common cathode LEDs or bulbs)
• Open-collector outputs
• Drive indicator segments directly
• Cascadable zero-suppression capability
• Lamp test input

Specifications

• Logic Family : LS
• Logic Type: Bipolar
• Number of Input Lines: 4
• Number of Lines (Input / Output): 4 / 7
• Propagation Delay Time: 100 ns @ 5 V
• Supply Voltage (Max): 5.25 V
• Supply Voltage (Min): 4.75 V
• Operating Temp Range : -65ºC to +150ºC
• No. of Pins: 16 Pins
• Package Type : DIP

Package Content

1 x 74LS48