d a t a sh eet product speci?cation file under integrated circuits, ic06 december 1990 integrated circuits 74hc/hct7245 octal bus schmitt-trigger transceiver; 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 bus schmitt-trigger transceiver; 3-state 74hc/hct7245 features octal bidirectional bus interface non-inverting 3-state outputs output capability: bus driver i cc category: msi schmitt-trigger action on all data inputs general description the 74hc/hct7245 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/hct7245 are octal transceivers featuring non-inverting 3-state bus compatible outputs in both send and receive directions. the 7245 features an output enable ( oe) input for easy cascading and a send/receive input (dir) for direction control. oe controls the outputs so that the buses are effectively isolated. the 74hc/hct7245 have schmitt-trigger inputs. these inputs are capable of transforming slowly changing input signals into sharply defined jitter-free output signals. the 7245 is identical to the 245 but has hysteresis on the data inputs. function table notes 1. h = high voltage level l = low voltage level x = dont care z = high impedance off-state inputs inputs/outputs oe dir a n b n l l h l h x a=b inputs z inputs b=a z 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 b n c l = 15 pf; v cc = 5 v 8 12 ns c i input capacitance 3.5 3.5 pf c i/o input/output capacitance 10 10 pf c pd power dissipation capacitance per transceiver notes 1 and 2 40 40 pf
december 1990 3 philips semiconductors product speci?cation octal bus schmitt-trigger transceiver; 3-state 74hc/hct7245 pin description pin no. symbol name and function 1 dir direction control 2, 3, 4, 5, 6, 7, 8, 9 a 0 to a 7 data inputs/outputs 10 gnd ground (0 v) 18, 17, 16, 15, 14, 13, 12, 11 b 0 to b 7 data inputs/outputs 19 oe output enable input (active low) 20 v cc positive supply voltage fig.1 pin configuration. a lfpage 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 dir a 0 gnd b 7 oe v cc a 1 a 2 a 3 a 4 a 5 a 6 a 7 b 6 b 5 b 4 b 3 b 2 b 1 b 0 7245 mba327 fig.2 functional diagram. g e mba330 19 1 2 9 11 18 b 7 oe dir b 0 a 7 a 0 fig.3 iec logic symbol. a ge mba404 11 12 13 14 15 16 17 18 2 1 3 2 4 5 6 7 8 9 19 1 g3 3en1 3en2
december 1990 4 philips semiconductors product speci?cation octal bus schmitt-trigger transceiver; 3-state 74hc/hct7245 dc characteristics for 74hc for the dc characteristics see 74hc/hct/hcu/hcmos logic family specifications . output capability: bus driver i cc category: msi transfer characteristics for 74hc voltages are referred to gnd (ground = 0 v) 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. v t + positive-going threshold 1.50 3.15 4.20 1.50 3.15 4.20 1.50 3.15 4.20 v 2.0 4.5 6.0 figs. 4 and 5 v t - negative-going threshold 0.30 1.35 1.80 0.30 1.35 1.80 0.30 1.35 1.80 v 2.0 4.5 6.0 figs. 4 and 5 v h hysteresis (v t + - v t - ) 0.1 0.25 0.3 0.2 0.4 0.5 0.1 0.25 0.3 0.1 0.25 0.3 v 2.0 4.5 6.0 figs. 4 and 5 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 b n ; b n to a n 33 12 10 100 20 17 125 25 21 150 30 26 ns 2.0 4.5 6.0 fig.7 t pzh / t pzl 3-state output enable time oe to a n ; oe to b n 47 17 14 160 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 a n ; oe to b n 52 19 16 160 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.7
december 1990 5 philips semiconductors product speci?cation octal bus schmitt-trigger transceiver; 3-state 74hc/hct7245 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. transfer characteristics for 74hct voltages are referred to gnd (ground = 0 v) input unit load coefficient a n b n oe dir 0.33 0.33 1.50 1.00 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. v t + positive-going threshold 2.0 2.1 2.0 2.1 2.0 2.1 v 4.5 5.5 figs. 4 and 5 v t - negative-going threshold 0.7 0.8 0.64 0.74 0.6 0.7 v 4.5 5.5 figs. 4 and 5 v h hysteresis (v t + - v t - ) 0.17 0.17 0.23 0.23 v 4.5 5.5 figs. 4 and 5
december 1990 6 philips semiconductors product speci?cation octal bus schmitt-trigger transceiver; 3-state 74hc/hct7245 ac characteristics for 74hct gnd = 0 v; t r =t f = 6 ns; c l = 50 pf 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 b n ; b n to a n 17 30 37 45 ns 4.5 fig.7 t pzh / t pzl 3-state output enable time oe to a n ; oe to b n 19 32 40 48 ns 4.5 fig.7 t phz / t plz 3-state output disable time oe to a n ; oe to b n 19 32 40 48 ns 4.5 fig.7 t thl / t tlh output transition time 5 12 15 18 ns 4.5 fig.7 transfer characteristic waveforms fig.4 transfer characteristic. handbook, halfpage mba325 v t v t v h v i v o fig.5 waveforms showing the definition of v t + , v t - and v h . h andbook, halfpage mba324 v t v t v h v i v o
december 1990 7 philips semiconductors product speci?cation octal bus schmitt-trigger transceiver; 3-state 74hc/hct7245 ac waveforms package outlines see 74hc/hct/hcu/hcmos logic package outlines . fig.6 waveforms showing the input (a n , b n ) to output (b n ,a 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. handbook, full pagewidth mba322 t plz v m (1) t pzl v m (1) v m (1) outputs disabled outputs enabled t pzh 90 % t phz 10 % 90 % t f t r outputs enabled output low - to - off off - to - low output high - to - off off - to - high oe input n 10 % (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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