MM74HC251M

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The MM74HC251M is a high-speed CMOS logic device featuring four non-inverting data selectors/ multiplexers with common select inputs and individual enable inputs. Each multiplexer features an internal 38Ω series resistor which terminates the high-impedance outputs. This device is used with common data select (S) inputs, data input/output (I0–I3, O) and enable (E) inputs ensuring that only one data line is active at a given time. This device is suitable for multiplexing operations, memory address selection and data telecom operations.

When an enable (E) input is pulled low, the associated group of four data select (S) inputs becomes active and data is selected from its addressed input line I0 to I3 and passed to the output line (O). The data (I0–I3) select inputs are asynchronous and level sensitive, which enables extremely short switching times. Note that when both E and S are high (disconnected), the device is in a high impedance state and no current flows. All inputs are protected from damage due to static discharge by diode clamps to VCC and ground.

The MM74HC251M is designed for 2.0–6.0V operation, with low power consumption and high noise immunity. It is a fully compatible CMOS version of the low-power Schottky TTL family and is ideal for use in sockets which formerly contained Schottky TTL devices. All MM74HC251M devices are configured as data multiplexers featuring excellent noise margin and maximum frequencies as high as 50 MHz. It also includes a latch-up protection of greater than 100 mA per JESD78.

The MM74HC251M is equipped with two primary features: bidirectional data flow capability, and bus-hold circuitry. The bidirectional data flow capability allows a group of data lines to be shared among multiple devices. Bus-hold circuitry holds each input at a logic high or low when the data line is not driven, providing a consistent transition on the data lines.

The MM74HC251M is a popular choice among manufacturers, due to its high noise immunity, wide operating voltage range, low power consumption, and excellent versatility. Its bidirectional data flow capability and bus-hold circuitry provide users with a reliable and efficient way of routing, selecting, and transmitting data. The range of applications for the MM74HC251M varies greatly, including PC and peripheral equipment, data switches, test instruments, industrial and medical equipment, and more.

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