The 74LS48 feature active-high outputs
for driving lamp buffers or common-cathode LEDs. They have full ripple-blanking
input/output controls and a lamp test input. Display patterns for BCD input
counts above 9 are unique symbols to authenticate input conditions.
Their 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. They 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.
Segment
identification and resultant displays is as shown below.
Features:
Internal
Pull-Ups Eliminate Need for External Resistors
Lamp-Test
Provision
Leading/Trailing
Zero Suppression
Lamp
Intensity Modulation Capability
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