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74AHCT257D
Quad 2-input multiplexer; 3-state
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
FEATURES ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000V EIA/JESD22-A115-A exceeds 200V
CDM EIA/JESD22-C101 exceeds 1000V Balanced propagation delays All inputs have Schmitt-trigger actions Non-inverting data path Inputs accept voltages higher than VCC For AHC only: operates with CMOS input levels For AHCT only: operates with TTL input levels Specified from −40to +85°C and −40to +125 °C.
DESCRIPTIONThe 74AHC/AHCT257 are high-speed Si-gate CMOS
devices and are pin compatible with Low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard No. 7A.
The 74AHC/AHCT257 has four identical 2-input
multiplexers with 3-state outputs, which select 4 bits of
data from two sources and are controlled by a common
data select input (S).
The data inputs from source 0 (1I0to 4I0) are selected
when input S is LOW and the data inputs from source1
(1I1to 4I1) are selected whenSis HIGH. Data appearsat
the outputs (1Yto 4Y)in true (non-inverting) form from the
selected inputs.
The 74AHC/AHCT257 is the logic implementation of a
4-pole 2-position switch, where the positionof the switchis
determined by the logic levels applied to S. The outputs
are forced to a high impedance OFF-state when OE is
HIGH. OE is LOW then the logic equations for the outputs are:=1I1× S+1I0×S;=2I1× S+2I0×S;=3I1× S+3I0×S;=4I1× S+4I0×S.
The ‘257’ is identical to the ‘258’ but has non-inverting
(true) outputs.
QUICK REFERENCE DATAGND=0 V; Tamb =25 °C; tr =tf≤ 3.0 ns.
Notes CPD is used to determine the dynamic power dissipation (PDin μW). =CPD× VCC2×fi+∑ (CL× VCC2×fo) where:= input frequency in MHz;= output frequency in MHz; (CL× VCC2×fo)= sum of outputs;= output load capacitance in pF;
VCC= supply voltage in Volts. The condition is VI= GNDto VCC.
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
FUNCTION TABLESee note1.
Note H= HIGH voltage level;= LOW voltage level;= don’t care;= high impedance OFF-state.
ORDERING INFORMATION
PINNING
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
RECOMMENDED OPERATING CONDITIONS
LIMITING VALUES accordance with the Absolute Maximum Rating System (IEC 60134); voltages are referencedto GND (ground=0 V).
Notes The input and output voltage ratings may be exceeded if the input and output current ratings are observed. For SO packages: above 70 °C the value of PD derates linearly with 8 mW/K.
For TSSOP packages: above 60 °C the value of PD derates linearly with 5.5 mW/K.
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
DC CHARACTERISTICS
74AHC familyOver recommended operating conditions; voltages are referenced to GND (ground=0V).
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
74AHCT familyOver recommended operating conditions; voltages are referenced to GND (ground=0V).
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
AC CHARACTERISTICS
Type 74AHC257GND=0 V; tr =tf≤ 3.0 ns.
Notes Typical values at VCC= 3.3V. Typical values at VCC= 5.0V.
Philips Semiconductors Product specification
Quad 2-input multiplexer; 3-state 74AHC257;
74AHCT257
Type 74AHCT257GND=0 V; tr =tf≤ 3.0 ns.
Note Typical values at VCC= 5.0V.
AC WAVEFORMS
