d a t a sh eet product speci?cation file under integrated circuits, ic06 december 1990 integrated circuits 74hc/hct253 dual 4-input multiplexer; 3-state for a complete data sheet, please also download: the ic06 74hc/hct/hcu/hcmos logic family specifications the ic06 74hc/hct/hcu/hcmos logic package information the ic06 74hc/hct/hcu/hcmos logic package outlines
december 1990 2 philips semiconductors product speci?cation dual 4-input multiplexer; 3-state 74hc/hct253 features non-inverting data path 3-state outputs for bus interface and multiplex expansion common select inputs separate output enable inputs output capability: bus driver i cc category: msi general description the 74hc/hct253 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 74hc/hct253 have two identical 4-input multiplexers with 3-state outputs which select two bits from four sources selected by common data select inputs (s 0 ,s 1 ). when the individual output enable (1 oe, 2 oe) inputs of the 4-input multiplexers are high, the outputs are forced to the high impedance off-state. the 253 is the logic implementation of a 2-pole, 4-position switch, where the position of the switch is determined by the logic levels applied to s 0 and s 1 . the logic equations for the outputs are: 1y=1 oe(1l 0 . s 1 . s 0 + 1i 1 . s 1 .s 0 + 1i 2 .s 1 . s 0 + 1i 3 .s 1 .s 0 ) 2y=2 oe(2l 0 . s 1 . s 0 + 2i 1 . s 1 .s 0 + 2i 2 .s 1 . s 0 + 2i 3 .s 1 .s 0 ) applications data selectors data multiplexers quick reference data gnd = 0 v; t amb = 25 c; t r = t f = 6 ns notes 1. c pd is used to determine the dynamic power dissipation (p d in m w): p d = c pd v cc 2 f i +? (c l v cc 2 f o ) where: f i = input frequency in mhz f o = output frequency in mhz ? (c l v cc 2 f o ) = sum of outputs c l = output load capacitance in pf v cc = supply voltage in v 2. for hc the condition is v i = gnd to v cc for hct the condition is v i = gnd to v cc - 1.5 v ordering information see 74hc/hct/hcu/hcmos logic package information . symbol parameter conditions typical unit hc hct t phl / t plh propagation delay c l = 15 pf; v cc = 5 v 1i n , 2i n to ny; 17 17 ns s n to ny 18 19 ns c i input capacitance 3.5 3.5 pf c pd power dissipation capacitance per multiplexer notes 1 and 2 55 55 pf
december 1990 3 philips semiconductors product speci?cation dual 4-input multiplexer; 3-state 74hc/hct253 pin description pin no. symbol name and function 1, 15 1 oe, 2 oe output enable inputs (active low) 14, 2 s 0 ,s 1 common data select inputs 7, 9 1y, 2y 3-state multiplexer outputs 8 gnd ground (0 v) 6, 5, 4, 3 1i 0 to 1i 3 data inputs from source 1 10, 11, 12, 13 2i 0 to 2i 3 data inputs from source 2 16 v cc positive supply voltage fig.1 pin configuration. fig.2 logic symbol. fig.3 iec logic symbol.
december 1990 4 philips semiconductors product speci?cation dual 4-input multiplexer; 3-state 74hc/hct253 function table notes 1. h = high voltage level l = low voltage level x = dont care z = high impedance off-state select inputs data inputs output enable output s 0 s 1 ni 0 ni 1 ni 2 ni 3 n oe ny xxxxxxh z l l h h l l l l l h x x x x l h x x x x x x x x l l l l l h l h l l h h h h h h x x x x x x x x l h x x x x l h l l l l l h l h fig.4 functional diagram. fig.5 logic diagram.
december 1990 5 philips semiconductors product speci?cation dual 4-input multiplexer; 3-state 74hc/hct253 dc characteristics for 74hc for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: bus driver i cc category: msi ac characteristics for 74hc gnd = 0 v; t r = t f = 6 ns; c l = 50 pf symbol parameter t amb ( c) unit test conditions 74hc v cc (v) waveforms + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max. t phl / t plh propagation delay 1i n to ny; 2i n to ny 55 20 16 175 35 30 220 44 37 265 53 45 ns 2.0 4.5 6.0 fig.6 t phl / t plh propagation delay s n to ny 58 21 17 175 35 30 220 44 37 265 53 45 ns 2.0 4.5 6.0 fig.6 t pzh / t pzl 3-state output enable time n oe to ny 30 11 9 100 20 17 125 25 21 150 30 26 ns 2.0 4.5 6.0 fig.7 t phz / t plz 3-state output disable time n oe to ny 41 15 12 150 30 26 190 38 33 225 45 38 ns 2.0 4.5 6.0 fig.7 t thl / t tlh output transition time 14 5 4 60 12 10 75 15 13 90 18 15 ns 2.0 4.5 6.0 fig.6
december 1990 6 philips semiconductors product speci?cation dual 4-input multiplexer; 3-state 74hc/hct253 dc characteristics for 74hct for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: bus driver i cc category: msi note to hct types the value of additional quiescent supply current ( d i cc ) for a unit load of 1 is given in the family specifications. to determine d i cc per input, multiply this value by the unit load coefficient shown in the table below. ac characteristics for 74hct gnd = 0 v; t r = t f = 6 ns; c l = 50 pf input unit load coefficient 1i n 2i n n oe s 0 s 1 0.40 0.40 1.10 1.10 1.10 symbol parameter t amb ( c) unit test conditions 74hct v cc (v) waveforms + 25 - 40 to + 85 - 40 to + 125 min. typ. max. min. max. min. max. t phl / t plh propagation delay 1i n to ny; 2i n to ny 20 38 48 57 ns 4.5 fig.6 t phl / t plh propagation delay s n to ny 22 40 50 60 ns 4.5 fig.6 t pzh / t pzl 3-state output enable time n oe to ny 14 30 38 45 ns 4.5 fig.7 t phz / t plz 3-state output disable time n oe to ny 13 30 38 45 ns 4.5 fig.7 t thl / t tlh output transition time 5 12 15 18 ns 4.5 fig.6
december 1990 7 philips semiconductors product speci?cation dual 4-input multiplexer; 3-state 74hc/hct253 ac waveforms package outlines see 74hc/hct/hcu/hcmos logic package outlines . fig.6 waveforms showing the input (1i n ,2i n ) to output (1y, 2y) propagation delays and the output transition times. (1) hc : v m = 50%; v i = gnd to v cc . hct: v m = 1.3 v; v i = gnd to 3 v. fig.7 waveforms showing the 3-state enable and disable times. (1) hc : v m = 50%; v i = gnd to v cc . hct: v m = 1.3 v; v i = gnd to 3 v.
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