74LS47 is a commonly used Integrated Circuit (IC) that functions as a BCD to 7-segment decoder/driver.
Part Number: SN74LS47N, SN74LS47D
Function: BCD-TO-SEVEN SEGMENT DECORDER/DRIVER.
Package: DIP 14 Pin type
Manufacturer: Motorola, ON Semi,
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Description
The 74LS47 is Low Power Schottky BCD to 7-Segment Decod-er / Drivers consisting of NAND gates, input buffers and seven AND-OR-IN-VERT gates. They offer active LOW, high sink current outputs for driving indicators directly. Seven NAND gates and one driver are connected in pairsto 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 onthe 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 of250μA. Indicator segments requiring up to 24 mA of current may be drivendirectly 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-edgezero-blanking control (RBI and RBO). Lamp test (LT) may be performed at anytime 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 theoutputs.
Pinout
Features
• Lamp Intensity Modulation Capability (BI/RBO)
• Open Collector Outputs
• Lamp Test Provision
• Leading / Trailing Zero Suppression
• Input Clamp Diodes Limit High-Speed Termination Effects
74LS47 PDF File
