8-input multiplexer
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
FEATURES
• High speed 8-to-1 mul...
Description
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
FEATURES
High speed 8-to-1 multiplexing On chip decoding Multifunction capability Inverting and Non-Inverting outputs Both outputs are 3-State for further multiplexer expansion
DESCRIPTION
The 74F251A is a logic implementation of a single 8-position switch with the switch position controlled by the state of three Select (S0, S1, S2) inputs. True (Y) and complementary (Y) outputs are both provided. The output enable (OE) is active Low. When OE is High, both outputs are in High impedance state, allowing multiple output connections to a common bus without driving nor loading the bus significantly. All but one device must be in High impedance state to avoid high currents that would exceed the maximum ratings when the outputs of the 3-State devices are tied together. When the output of more than one device is tied together the user must ensure that there is no overlap in the active Low portion of the output enable voltages.
PIN CONFIGURATION
I3 I2 I1 I0 Y Y OE GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC I4 I5 I6 I7 S0 S1 S2
SF00778
TYPE 74F251A
TYPICAL PROPAGATION DELAY 4.5ns
TYPICAL SUPPLY CURRENT (TOTAL) 19mA
ORDERING INFORMATION
ORDER CODE DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F251AN N74F251AD PKG DWG # SOT38-4 SOT162-1
16-pin plastic DIP 16-pin plastic SO
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS I0–I7 S0–S2 OE Y, Y Data inputs Select ...
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