SN74LS393DR

Timing:	--
Base Part Number:	74LS393
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	4.75V ~ 5.25V
Trigger Type:	Negative Edge
Count Rate:	35MHz
Series:	74LS
Reset:	Asynchronous
Number of Bits per Element:	4
Number of Elements:	2
Direction:	Up
Logic Type:	Binary Counter
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The SN74LS393DR is a dual 4-bit binary counter. It has been designed specifically to provide a cost-effective solution for high-speed counting and timing requirements in consumer, industrial, telecommunications and automotive applications. Its two separate but simultaneously operating counters allow accurate and reliable counting from rising or falling edges of digital pulses.The SN74LS393DR is composed of two 4-bit counters with two gates and one enable input. They each include two gate inputs (G1 and G2), two enable inputs (E1 and E2), two reset inputs (R1 and R2), and four outputs (Q1-Q4). The G1 and G2 inputs allow the counters to count up, down, or to count up and down in sequence. For the latter mode, the counter must first count up, then down (or vice versa) in every cycle, forming a counting pattern called “zigzag”. The G1 and G2 inputs control the direction of the counting. When G1 is low and G2 is high, the counter counts up and when G2 is low and G1 is high, the counter counts down. The E1 and E2 inputs are used to enable or disable the counting. When both E1 and E2 are low, the counter is operating in normal mode. When either of the two is high, the counter is disabled and no counting will be done. Lastly, the R1 and R2 inputs are used to reset the counter. The SN74LS393DR is capable of a wide range of operation choices due to its various count control inputs and outputs. It can operate in either asynchronous or synchronous mode and it can be used as an up or down counter, or both. By using specific combinations of G1 and G2 to control its operations, it is also possible to cascade multiple SN74LS393DR to increase the number of bits they can count.The SN74LS393DR also features a built-in Thermal Shut-down protection circuit. This circuit prevents operation of the counter when the surface temperature of the die exceeds the maximum temperature rating. It is also immune to false triggering due to ESD or electrostatic discharges as it has been designed according to the CMOS standard.In conclusion, SN74LS393DR is a flexible and cost-effective dual 4-bit binary counter designed specifically for high-speed counting and timing applications. It offers a wide range of operation choices, such as up-counting, down-counting, or both, and the option to cascade multiple counters to increase the number of bits they can count. The built-in thermal shut-down protection and ESD immunity makes it suitable for a wide variety of applications in the automotive, industrial, telecommunications and consumer sectors.

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