SN7448 Datasheet – BCD-To-Seven-Segment Decoder / Driver

Part Number: SN7448


Package: DIP 16 Pin Type

Manufacturer: Texas Instruments


SN7448 datasheet


The 46A, 47A, and LS47 feature active-low outputs designed for driving, common-anode LEDs or incandescent indicators directly. The 48, LS48, and LS49 feature active-high outputs for driving lamp buffers or common-cathode LEDs. All of the circuits except LS49 have full ripple-blanking input/output controls and a lamp test input. The LS49 circuit incorporates a direct blanking input. Segment identification and resultant displays are shown below. Display patterns for BCD input counts above 9 are unique symbols to authenticate input conditions.

The 46A, 47A, 48, LS47, and LS48 circuits incorporate automatic leading and/or trailing-edge zero-blanking control (RBI and RBO). Lamp test (LT) of these types may be performed at any time when the BI/RBO node is at a high level. All types (including the 49 and LS49) contain an overriding blanking input (BI), which can be used to control the lamp intensity by pulsing or to inhibit the outputs. Inputs and outputs are entirely compatible for use with TTL logic outputs.

The SN54246/SN74246 and 247 and the SN54LS247/SN74LS247 and LS248 compose the 6 and the 9 with tails and were designed to offer the designer a choice between two indicator fonts.

46A, 47A, LS47 feature
-Open-Collector Outputs Drive Indicators Directly
-Lamp-Test Provision
-Leading/Trailing Zero Suppression

48, LS48 feature
-Internal Pull-Ups Eliminate Need for External Resistors
-Lamp-Test Provision
-Leading/Trailing Zero Suppression

LS49 feature
-Open-Collector Outputs
-Blanking Input

All Circuit Types Feature Lamp Intensity Modulation Capability

Other data sheets are available within the file: SN7448N

SN7448 Datasheet PDF Download

SN7448 pdf