N74F253D,623 NXP

INTEGRATED CIRCUITS 74F253 Dual 4-bit input multiplexer (3-State) Product specification 1988 Nov 29 IC15 Data Handbook
    Philips Semiconductors Product specification Dual 4-input multiplexer (3-State) 74F253 FEATURES PIN CONFIGURATION 3-State outputs for bus interface and multiplex expansion OEa 1 16 V CC Common select inputs S1 2 15 OEb Separate Output Enable Inputs I3a 3 14 S0 I2a 4 13 I3b DESCRIPTION I1a 5 12 I2b The 74F253 has two identical 4-input multiplexers with 3-State I0a 6 11 I1b outputs which select two bits from four sources selected by common Select inputs (S0, S1). When the individual Output Enable (OEa, Ya 7 10 I0b OEb) inputs of the 4-input multiplexers are High, the outputs are GND 8 9 Yb forced to a high impedance (Hi-Z) state. SF00798 The 74F253 is the logic implementation of a 2-pole, 4-position switch; the position of the switch being determined by the logic levels supplied to the two common Select inputs. TYPICAL TYPICAL TYPE PROPAGATION SUPPLY CURRENT To avoid exceeding the maximum current ratings when the outputs DELAY (TOTAL) of the 3-State devices are tied together, all but one device must be 74F253 7.0ns 12mA in the high-impedance state. Therefore, only one Output Enable must be active at a time. ORDERING INFORMATION COMMERCIAL RANGE DESCRIPTION PKG DWG # V = 5V 10%, CC T = 0C to +70C amb 16-pin plastic DIP N74F253N SOT38-4 16-pin plastic SO N74F253D SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW I0aI3a Port A data inputs 1.0/1.0 20A/0.6mA I0bI3b Port B data inputs 1.0/1.0 20A/0.6mA S0, S1 Common Select inputs 1.0/1.0 20A/0.6mA OEa Port A Output Enable input (active Low) 1.0/1.0 20A/0.6mA OEb Port B Output Enable input (active Low) 1.0/1.0 20A/0.6mA Ya, Yb 3-State outputs 150/40 3mA/24mA NOTE: One (1.0) FAST unit load is defined as: 20A in the High state and 0.6mA in the Low state. LOGIC SYMBOL IEC/IEEE SYMBOL 14 6 5 4 3 10 11 12 13 0 0 G 3 2 1 MUX 1 I0a I1a I2a I3a I0b I1b I2b I3b EN 6 14 S0 0 7 5 1 2 S1 4 2 1 OEa 3 3 15 OEb 15 Ya Yb 10 9 11 12 V = Pin 16 7 9 CC 13 GND = Pin 8 SF00799 SF00800 2 1988 Nov 29 8530101 95206