SN74LS47N Datasheet

BCD to 7-Segment Decoder/Driver


The SN74LS47N is 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 SN74LS47N is designed to withstand the relatively high voltages required for 7-segment indicators. The SN74LS47N outputs will withstand 15 V with a maximum reverse current of 250 mA. Indicator segments requiring up to 24 mA of current may be driven directly from the SN74LS47N high performance output transistors. Display patterns for BCD input counts above nine are unique symbols to authenticate input conditions. The SN74LS47N 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. SN74LS47N 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


[{"Name":"Supply Voltage VCC","Value":"4.75 to 5.25 V"},{"Name":"Operating Ambient Temperature Range TA","Value":"0 to 70 ℃"},{"Name":"Output Current — High BI /RBO IOH","Value":"–50 mA"},{"Name":"Output Current — Low BI /RBO IOL","Value":"3.2 mA"},{"Name":"VO (off) Off-State Output Voltage a to g","Value":"15 V"},{"Name":"IO (on) On-State Output Current a to g","Value":"24 mA"},{"Name":"Maximum Operating Junction Temperature Range TJ","Value":"-55 to + 125°C"},{"Name":"Maximum Soldering Temperature Range TSTG","Value":"-65 to + 155°C"},{"Name":"","Value":""},{"Name":"","Value":""}]

Manufacturer information


Microchip Technology Inc. is a leading provider of microcontroller, mixed-signal, analog and Flash-IP solutions, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.

Microchip Technology Inc. has acquired Atmel.

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