DM74AS169AN

Timing:	Synchronous
Base Part Number:	74AS169
Supplier Device Package:	16-DIP
Package / Case:	16-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	4.5V ~ 5.5V
Trigger Type:	Positive Edge
Count Rate:	75MHz
Series:	74AS
Reset:	--
Number of Bits per Element:	4
Number of Elements:	1
Direction:	Up, Down
Logic Type:	Binary Counter
Part Status:	Obsolete
Packaging:	Tube

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DM74AS169AN is an 8-bit synchronous decade up/down counter based on a register-type architecture that is designed for two\'s complement binary applications. The device outputs a logic one when the internal register contents go from 11111111 to 00000000 or from 00000000 to 11111111 (decade counting) or from 01111111 to 10000000 or from 10000000 to 01111111 (binary counting). The decade up/down counter requires only two power supply voltages for operation: +VCC and GND.The DM74AS169AN is designed to provide maximum flexibility and synchronous operation throughout the counter\'s eight-bit array. Its high-speed synchronous operation allows the device to count at frequencies up to 4 MHz with VCC as low as 4 V. This device is fully static and manual resetting is not required to ensure proper operation or initialize the device; it is also quite tolerant to power supply variations.The DM74AS169AN can be used as either a decade counter or an up/down counter with parity check capability. The counter can be used to count up to the nine\'s position in either mode and to the eight\'s position in decade mode. The decade up/down counter can also be reset to the preset value so that counting can continue from the preset value instead of from zero. In addition, the device is capable of generating either a low or a high on the carry out output depending upon the type of count being performed.As an up/down counter, the DM74AS169AN can count up to the nine\'s position in either direction and the eight\'s position in up-count mode. This device also features an enable (OE) input that is used to load the preset value into the counter. The enables can be used to synchronize the counting operation of two decade up/down counters.The DM74AS169AN also includes XOR function capability which allows it to measure differences between two set values. This XOR operation is especially useful for calculating the differences between two position encoder outputs. Another great feature of the DM74AS169AN is its parity check capability which is used to determine if the count is even or odd.In conclusion, the DM74AS169AN is a versatile device that is designed for two\'s complement binary applications and can be used for decade and up/down counting with parity check capabilities. It is designed to provide maximum flexibility and synchronous operation at high frequencies with VCC as low as 4V. Its XOR function and parity check capability make it particularly useful in various applications. The device is fully static and manual resetting is not required to ensure proper operation or initialize the device and its high tolerance to power supply variations make it highly reliable.

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