DM74ALS163BM

Timing:	Synchronous
Base Part Number:	74ALS163
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	4.5V ~ 5.5V
Trigger Type:	Positive Edge
Count Rate:	40MHz
Series:	74ALS
Reset:	Synchronous
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Up
Logic Type:	Binary Counter
Part Status:	Obsolete
Packaging:	Tube

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DM74ALS163B is a 16-bit binary counter with a clock input (CP), a reset input (MR), and an output enable input (OE) which can be used to disable the counting function. The counter is capable of incremental counts up and down, depending on the logic levels applied to the CNTRL input. The parts use Schottky-clamped transistor technology to provide a high-speed, low-power and extremely low-noise design. The parts also incorporate a master reset and an asynchronous preset.The application of DM74ALS163B is in a variety of fields, such as communication systems, embedded systems, instrumentation, automotive industry, military and industrial control. It can be used in radio receivers, signal generators, signal analyzers, timing control, logic control and frequency synthesizers.DM74ALS163B consists of four stages of divide-by-two counters connected in a serial chain which allows for 16-bit parallel load and parallel read. Each stage has the build-in flip-flop, so it can count either up or down depending on the logic levels present on the CNTRL input. The internal counter can be reset to its “0” or “1” state independently of the clock input. The output enable input, OE, is used to enable or disable the output of the counter.The working principle of the device is that it is a synchronous, fully-static counter which counts in parallel up to its capacity, 16 bits maximum. The count sequence is determined by the logical levels present on the CNTRL input. After each subsequent CP low-to-high transition, the count is incremented or decremented by one, depending on CNTRL inputs. When the maximum count of 16 bits is reached, the next clock cycle resets the count to 0. The reset input, MR, can be used to reset the count to 0 without a clock cycle. The output enable input (OE) can be used to enable or disable the output of the device.In conclusion, the DM74ALS163B is a 16-bit binary counter which is used in many application fields. It consists of four divide-by-two stages and uses Schottky-clamped transistor technology. It has built-in reset, asynchronous preset and output enable features for power efficiency. It can count in both up and down direction, depending on the logic levels applied on the CNTRL input.

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