DatasheetsPDF.com

74LS47

Motorola
Part Number 74LS47
Manufacturer Motorola
Description BCD TO 7-SEGMENT DECODER/DRIVER
Published Aug 24, 2020
Detailed Description BCD TO 7-SEGMENT DECODER/DRIVER The SN54 / 74LS47 are Low Power Schottky BCD to 7-Segment Decoder / Drivers consisting o...
Datasheet PDF File 74LS47 PDF File

74LS47
74LS47

Overview
BCD TO 7-SEGMENT DECODER/DRIVER The SN54 / 74LS47 are Low Power Schottky BCD to 7-Segment Decoder / Drivers consisting of NAND gates, input buffers and seven AND-OR-INVERT gates.
They offer active LOW, high sink current outputs for driving indicators directly.
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 output and ripple-blanking input.
The circuits accept 4-bit binary-coded-decimal (BCD) and, depending on the state of the auxiliary inputs, decodes this data to drive a 7-segment display indicator.
The relative positive-logic output levels, as well as conditions required at the auxiliary inputs, are shown in the truth tables.
Output configurations of the SN54 / 74LS47 are designed to withstand the relatively high voltages required for 7-segment indicators.
These outputs will withstand 15 V with a maximum reverse current of 250 µA.
Indicator segments requiring up to 24 mA of current may be driven directly from the SN74LS47 high performance output transistors.
Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions.
The SN54 / 74LS47 incorporates automatic leading and / or trailing-edge zero-blanking control (RBI and RBO).
Lamp test (LT) may be performed at any time which the BI / RBO node is a HIGH level.
This device also contains 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.
• Lamp Intensity Modulation Capability (BI/RBO) • Open Collector Outputs • Lamp Test Provision • Leading / Trailing Zero Suppression • Input Clamp Diodes Limit High-Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC f g a b c d e 16 15 14 13 12 11 10 9 SN54/74LS47 BCD TO 7-SEGMENT DECODER/ DRIVER LOW POWER SCHOTTKY 1...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)