SN74LS47

The SN74LS47 is low power schottky BCD to 7-segment decoder/drivers consisting of NAND gates, input buffers and seven AND-OR-IN-VERT gates. The features of the SN74LS47 are: (1)lamp intensity modulation capability; (2)open collector outputs; (3)lamp/trailing zero suppression; (4)input clamp diodes limit high-speed termination effects.

The following is about the absolute maximum ratings of SN74LS47: (1)supply voltage: 4.5V min, 5.0V typical and 5.5V max; (2)operating ambient temperature range: -55 min, 25 typical and 125 max; (3)output current-high: -50A; (4)output current-low: 1.6mA; (5)off-state output voltage: 15V max; (6)on-state output current: 12mA max.

The electrical characteristics of the SN74LS47 are: (1)input high voltage: 2.0V min at guaranteed input high thershold voltage for all inputs; (2)input low voltage: 0.7V max at guaranteed input low thershold voltage for all inputs; (3)input clamp diode voltage: -0.65V typical and -1.5V max; (4)output high diode voltage: -0.65V typical and -1.5V max at VCC=min, IIN=-18mA; (5)output high voltage: 2.4V min and 4.2V typical at VCC=min, IOH=-50A, VIN=VIN or VIL per truth table; (6)output low voltage: 0.25V typical and 0.4V max at IOL=1.6mA  and VCC=min, VIN=VIN or VIL per truth table; (7)off-state output current: 250A at VCC=max, VIN=VIN or VIL per truth table, VO(off)=15V; (8)on-state output voltage:  0.25V typical and 0.4V max at IO(on)=12mA, VCC=max, VIN=VIH or VIL per truth table.