d a t a sh eet product speci?cation file under integrated circuits, ic06 december 1990 integrated circuits 74hc/hct541 octal buffer/line driver; 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 octal buffer/line driver; 3-state 74hc/hct541 features non-inverting outputs output capability: bus driver i cc category: msi general description the 74hc/hct541 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/hct541 are octal non-inverting buffer/line drivers with 3-state outputs. the 3-state outputs are controlled by the output enable inputs oe 1 and oe 2 . a high on oe n causes the outputs to assume a high impedance off-state. the 541 is identical to the 540 but has non-inverting outputs. 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 a n to y n c l = 15 pf; v cc = 5 v 10 12 ns c i input capacitance 3.5 3.5 pf c pd power dissipation capacitance per buffer notes 1 and 2 37 39 pf
december 1990 3 philips semiconductors product speci?cation octal buffer/line driver; 3-state 74hc/hct541 pin description pin no. symbol name and function 1, 19 oe 1 , oe 2 output enable input (active low) 2, 3, 4, 5, 6, 7, 8, 9 a 0 to a 7 data inputs 10 gnd ground (0 v) 18, 17, 16, 15, 14, 13, 12, 11 y 0 to y 7 bus outputs 20 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 octal buffer/line driver; 3-state 74hc/hct541 fig.4 functional diagram. function table notes 1. h = high voltage level l = low voltage level x = dont care z = high impedance off-state inputs output oe 1 oe 2 a n y n l l x h l l h x l h x x l h z z fig.5 logic diagram.
december 1990 5 philips semiconductors product speci?cation octal buffer/line driver; 3-state 74hc/hct541 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 a n to y n 33 12 10 115 23 20 145 29 25 175 35 30 ns 2.0 4.5 6.0 fig.6 t pzh / t pzl 3-state output enable time oe to y n 55 20 16 160 32 27 200 40 34 240 48 41 ns 2.0 4.5 6.0 fig.7 t phz / t plz 3-state output disable time oe to y n 61 22 18 160 32 27 200 40 34 240 48 41 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 octal buffer/line driver; 3-state 74hc/hct541 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 oe 1 oe 2 a n 1.50 1.00 0.70 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 a n to y n 15 28 35 42 ns 4.5 fig.6 t pzh / t pzl 3-state output enable time oe to y n 21 35 44 53 ns 4.5 fig.7 t phz / t plz 3-state output disable time oe to y n 21 35 44 53 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 octal buffer/line driver; 3-state 74hc/hct541 ac waveforms package outlines see 74hc/hct/hcu/hcmos logic package outlines . fig.6 waveforms showing the input (a n ) to output (y n ) 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.
|
