74147 Datasheet PDF – Priority Encoder

Part Number: 74147, SN74147N

Function: Priority Encoder

Pacakge : DIP 16 Pin Type

Manufacturer: Texas Instruments, CDIL,  Fairchild Semiconductor


74147 encoder


These TTL encoders feature priority decoding of the inputs to ensure that only the highest-order data line is encoded. The 74147 and 74LS147 devices encode nine data lines to four-line (8-4-2-1) BCD. The implied decimal zero condition requires no input condition, as zero is encoded when all nine data lines are at a high logic level.

The 74148 and 74LS148 devices encode eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry. For all types, data inputs and outputs are active at the low logic level. All inputs are buffered to represent one normalized Series 54/74 or 54/74LS load, respectively.


74147 datasheet pinout

74LS147 pinout


74147 Truth Table



1. Encode 10-Line Decimal to 4-Line BCD
2. Applications Include:

− Keyboard Encoding
− Range Selection


74147 Datasheet PDF Download

74147 pdf

74LS147 pdf


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74LS848 Datasheet PDF – 8-Input Priority Encoder – Motorola

Part Number: 74LS848

Function: 8-Input Priority Encoder

Package: DIP, SOP 16 Pin Type

Manufacturer: Motorola ( Freescale )


74LS848 datasheet



The SN54LS348 / 74LS348 and the SN54348 / SN74848 are eight input priority encoders which provide the 8-line to 3-line function. Theoutputs (A0–A2) and inputs (0– 7) are active low. The active low input whichhas the highest priority (input 7 has the highest) is represented on the outputs(output A0 is the lowest bit). An example would be if inputs 1, 2 and 4 were low, then a binary 4 would be represented on the outputs. The GS (Group Signal) output is active low when any of the inputs are low. It serves to indicate when any of the inputs are active. A0, A1 and A2 are three-state outputs. This allows for up to 64 line expansion without the need for special external circuitry.


1. Low Power Schottky

Other data sheets are available within the file: 54LS848J, 74LS848D, 74LS848N, SN54LS848J, 74848


74LS848 Datasheet PDF Download

74LS848 pdf