tc74vhct125,126af/aft/afk 2012-02-29 1 toshiba cmos digital integrated ci rcuit silicon monolithic tc74vhct125af,tc74vhct125aft,tc74vhct125afk tc74vhct126af,tc74vhct126aft,tc74vhct126afk tc74vhct125af/aft/afk quad bus buffer tc74vhct126af/aft/afk quad bus buffer the tc74vhct125a/126a are high speed cmos quad bus buffers fabricated with silicon gate c 2 mos technology. they achieve the high speed op eration similar to equivalent bipolar shottky ttl while maintaining the cmos low power dissipation. the tc74vhct125a requires the 3-state control input g to be set high to place the output into the high impedance state, whereas the tc74vhct126a requires the control input g to be set low to place the output into high impedance. the input voltage are compatible with ttl output voltage. this device may be used as a level converter for interfacing 3.3 v to 5 v system. input protection and output circu it ensure that 0 to 5.5 v can be applied to the input and output (note) pins without regard to the supply voltage. there structur e prevents device detsruction due to mismatched supply and in put/output voltages such as battery back up, hot board insertion, etc. note: v cc = 0 v features ? high speed: tpd = 3.8 ns (typ.) at v cc = 5 v ? low power dissipation: i cc = 4 a (max) at ta = 25c ? compatible with ttl inputs: v il = 0.8 v (max) v ih = 2.0 v (min) ? power down protection is provid ed on all inputs and outputs. ? balanced propagation delays: t plh ? t phl ? low noise: v olp = 0.8 v (max) ? pin and function compatible with the 74 series (74ac/hc/f/als/ls etc.) 125/126 types. tc74vhct125af, tc74vhct126af tc74vhct125aft, tc74vhct126aft tc74vhct125afk, tc74vhct126afk weight sop14-p-300-1.27a:0.18 g (typ.) tssop14-p-0044-0.65a: 0.06 g (typ.) vssop14-p-0030-0.50: 0.02 g (typ.)
tc74vhct125,126af/aft/afk 2012-02-29 2 pin assignment iec logic symbol truth table tc74vhct125a inputs output g a y h x z l l l l h h x: don?t care z: high impedance tc74vhct126a inputs output g a y l x z h l l h h h x: don?t care z: high impedance v cc 9 4a 4y 8 14 13 12 11 10 g1 1 2 3 4 5 6 7 2a 2y gnd 3a 3y (top view) 1a tc74vhct125a g2 g 4 g3 1y v cc 9 4a 4y 8 14 12 11 10 1 2 3 4 5 6 7 2a 2y gnd 3a 3y (top view) 1a 1y tc74vhct126a 13 1g 2g 4g 3g (4) (10) (5) g 2 en g 3 2a (13) (9) (12) g 4 3a (6) (8) (11) 2y 3y 4y 4a (1) (2) g 1 1a (3) 1y tc74vhct125a (4) (10) (5) en 2a (13) (9) (12) 3a (6) (8) (11) 2y 3y 4y 4a (1) (2) 1a (3) 1y tc74vhct126a 1g 2g 3g 4g
tc74vhct125,126af/aft/afk 2012-02-29 3 absolute maximum ratings (note 1) characteristics symbol rating unit supply voltage range v cc ? 0.5 to 7.0 v dc input voltage v in ? 0.5 to 7.0 v ? 0.5 to 7.0 (note 2) dc output voltage v out ? 0.5 to v cc + 0.5 (note 3) v input diode current i ik ? 20 ma output diode current i ok 20 (note 4) ma dc output current i out 25 ma dc v cc /ground current i cc 50 ma power dissipation p d 180 mw storage temperature t stg ? 65 to 150 c note 1: exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in ic performance or even destruction. using continuously under heavy loads (e.g. the app lication of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temper ature/current/voltage, etc. ) are within the absolute maximum ratings and the operating ranges. please design the appropriate reliability upon reviewing the toshiba semiconductor reliability handbook (?handling precautions?/?derating concept and methods?) and individual reliability data (i.e. reliability test report and estimated failure rate, etc). note 2: output in off-state note 3: high or low state. i out absolute maximum rating must be observed. note 4: v out < gnd, v out > v cc operating ranges (note 1) characteristics symbol rating unit supply voltage v cc 4.5 to 5.5 v input voltage v in 0 to 5.5 v 0 to 5.5 (note 2) output voltage v out 0 to v cc (note 3) v operating temperature t opr ? 40 to 85 c input rise and fall time dt/dv 0 to 20 ns/v note 1: the operating ranges must be maintai ned to ensure the normal op eration of the device. unused inputs must be tied to either v cc or gnd. note 2: output in off-state note 3: high or low state
tc74vhct125,126af/aft/afk 2012-02-29 4 electrical characteristics dc characteristics ta = 25c ta = ? 40 to 85c characteristics symbol test condition v cc (v) min typ. max min max unit high-level input voltage v ih D 4.5 to 5.5 2.0 D D 2.0 D v low-level input voltage v il D 4.5 to 5.5 D D 0.8 D 0.8 v i oh = ? 50 a 4.5 4.40 4.50 D 4.40 D high-level output voltage v oh v in = v ih or v il i oh = ? 8 ma 4.5 3.94 D D 3.80 D v i ol = 50 a 4.5 D 0.0 0.1 D 0.1 low-level output voltage v ol v in = v ih or v il i ol = 8 ma 4.5 D D 0.36 D 0.44 v input leakage current i in v in = 5.5 v or gnd 0 to 5.5 D D 0.1 D 1.0 a 3-state output off-state current i oz v in = v ih or v il v out = v cc or gnd 5.5 D D 0.25 D 2.50 a i cc v in = v cc or gnd 5.5 D D 4.0 D 40.0 a quiescent supply current i cct per input: v in = 3.4 v other input: v cc or gnd 5.5 D D 1.35 D 1.50 ma output leakage current i opd v out = 5.5 v 0 D D 0.5 D 5.0 a ac characteristics (input: t r = t f = 3 ns) test condition ta = 25c ta = ? 40 to 85c characteristics symbol v cc (v) c l (pf) min typ. max min max unit 15 D 3.8 5.5 1.0 6.5 propagation delay time t plh t phl D 5.0 0.5 50 D 5.3 7.5 1.0 8.5 ns 15 D 3.6 5.1 1.0 6.0 output enable time t pzl t pzh r l = 1 k ? 5.0 0.5 50 D 5.1 7.1 1.0 8.0 ns output disable time t plz t phz r l = 1 k ? 5.0 0.5 50 D 6.1 8.8 1.0 10.0 ns output to output skew t oslh t oshl (note 1) 5.0 0.5 50 D D 1.0 D 1.0 ns input capacitance c in D D 4 10 D 10 pf output capacitance c out D D 6 D D D pf tc74vhct125a D 14 D D D power dissipation capacitance c pd (note 2) tc74vhct126a D 15 D D D pf note 1: parameter guaranteed by design. t oslh = |t plhm ? t plhn |, t oshl = |t phlm ? t phln | note 2: c pd is defined as the value of the internal equivalent capacitance which is ca lculated from the operating current consumption without load. average operating current can be obtained by the equation: i cc (opr) = c pd v cc f in + i cc /4 (per gate)
tc74vhct125,126af/aft/afk 2012-02-29 5 noise characteristics (input: t r = t f = 3 ns) ta = 25c characteristics symbol test condition v cc (v) typ. limit unit quiet output maximum dynamic v ol v olp c l = 50 pf 5.0 0.5 0.8 v quiet output minimum dynamic v ol v olv c l = 50 pf 5.0 ? 0.5 ? 0.8 v minimum high level dynamic input voltage v ihd c l = 50 pf 5.0 D 2.0 v maximum low level dynamic input voltage v ild c l = 50 pf 5.0 D 0.8 v
tc74vhct125,126af/aft/afk 2012-02-29 6 package dimensions weight: 0.18 g (typ.)
tc74vhct125,126af/aft/afk 2012-02-29 7 package dimensions weight: 0.06 g (typ.)
tc74vhct125,126af/aft/afk 2012-02-29 8 package dimensions weight: 0.02 g (typ.)
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