tc74lcx138f/fn/ft 2002-01-11 1 toshiba cmos digital integrated circuit silicon monolithic tc74lcx138f,TC74LCX138FN,tc74lcx138ft low-voltage 3-to-8 line decoder with 5-v tolerant inputs and outputs the tc74lcx138f/fn/ft is a high-performance cmos 3-to-8 decoder. designed for use in 3.3-v systems, it achieves high-speed operation while maintaining the cmos low-power dissipation. the device is designed for low-voltage (3.3 v) v cc applications, but it could be used to interface to 5-v supply environment for inputs. when the device is enabled, 3 binary select inputs (a, b and c) determine which one of the outputs (y0- y7) will go low. when enable input g1 is held low or either g2a or g2b is held high, decoding function is inhibited and all outputs go high. g1, g2a, and g2b inputs are provided to ease cascade connection and for use as an address decoder for memory systems. all inputs are equipped with protection circuits against static discharge. features low-voltage operation: v cc = 2.0 to 3.6 v high-speed operation: t pd = 6.0 ns (max) (v cc = 3.0 to 3.6 v) ouput current: |i oh |/i ol = 24 ma (min) (v cc = 3.0 v) latch-up performance: 500 ma available in jedec sop, jeita sop and tssop power-down protection provided on all inputs and outputs pin and function compatible with the 74 series (74ac/vhc/hc/f/als/ls etc.) 138 type note: xxxfn (jedec sop) is not available in japan. tc74lcx138f TC74LCX138FN tc74lcx138ft weight sop16-p-300-1.27: 0.18 g (typ.) sol16-p-150-1.27: 0.12 g (typ.) tssop16-p-0044-0.65: 0.06 g (typ.)
tc74lcx138f/fn/ft 2002-01-11 2 pin assignment (top view) iec logic symbol truth table inputs outputs enable select g1 a 2 g b 2 g c b a 0 y 1 y 2 y 3 y 4 y 5 y 6 y 7 y selected output l x x x x x h h h h h h h h none x h x x x x h h h h h h h h none x x h x x x h h h h h h h h none h l l l l l l h h h h h h h 0 y h l l l l h h l h h h h h h 1 y h l l l h l h h l h h h h h 2 y h l l l h h h h h l h h h h 3 y h l l h l l h h h h l h h h 4 y h l l h l h h h h h h l h h 5 y h l l h h l h h h h h h l h 6 y h l l h h h h h h h h h h l 7 y x: don?t care v cc 16 0 y 1 y 2 y 3 y 4 y 15 14 13 12 11 10 a1 2 3 4 5 6 7 b c a 2 g b 2 g g1 7 y 5 y 8 gnd 9 6 y 1 en 0 3 2 5 4 7 6 b a c g1 a 2 g (14) (15) (12) (13) (10) (11) (7) (9) (1) (3) (2) (6) (5) (4) 2 1 4 & bin/oct 1 y 3 y 5 y 6 y 0 y b 2 g 2 y 4 y 7 y 0 g 7 1 0 3 2 5 4 7 6 b a c g1 a 2 g (14) (15) (12) (13) (10) (11) (7) (9) (1) (3) (2) (6) (5) (4) 0 2 & dmux 1 y 3 y 5 y 6 y 0 y b 2 g 2 y 7 y 4 y
tc74lcx138f/fn/ft 2002-01-11 3 system diagram maximum ratings characteristics symbol rating unit power supply voltage 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 1) dc output voltage v out 0.5 to v cc 0.5 (note 2) v input diode current i ik 50 ma output diode current i ok 50 (note 3) ma dc output current i out 50 ma power dissipation p d 180 mw dc v cc /ground current i cc /i gnd 100 ma storage temperature t stg 65 to 150 c note 1: v cc 0 v note 2: high or low state. i out absolute maximum rating must be observed. note 3: v out gnd, v out v cc a b c 1 2 3 4 5 6 select inputs enable inputs a 2 g b 2 g g1 15 data outputs 14 1 y 13 2 y 12 11 4 y 10 9 7 7 y 0 y 3 y 5 y 6 y
tc74lcx138f/fn/ft 2002-01-11 4 recommended operating conditions characteristics symbol rating unit 2.0 to 3.6 power supply voltage v cc 1.5 to 3.6 (note 4) v input voltage v in 0 to 5.5 v 0 to 5.5 (note 5) output voltage v out 0 to v cc (note 6) v 24 (note 7) output current i oh /i ol 12 (note 8) ma operating temperature t opr 40 to 85 c input rise and fall time dt/dv 0 to 10 (note 9) ns/v note 4: data retention only note 5: v cc 0 v note 6: high or low state note 7: v cc 3.0 to 3.6 v note 8: v cc 2.7 to 3.0 v note 9: v in 0.8 to 2.0 v, v cc 3.0 v electrical characteristics dc characteristics (ta 40 to 85c) characteristics symbol test condition v cc (v) min max unit h-level v ih 2.7 to 3.6 2.0 input voltage l-level v il 2.7 to 3.6 0.8 v i oh 100 a 2.7 to 3.6 v cc 0.2 i oh 12 ma 2.7 2.2 i oh 18 ma 3.0 2.4 h-level v oh v in v ih or v il i oh 24 ma 3.0 2.2 i ol 100 a 2.7 to 3.6 0.2 i ol 12 ma 2.7 0.4 i ol 16 ma 3.0 0.4 output voltage l-level v ol v in v ih or v il i ol 24 ma 3.0 0.55 v input leakage current i in v in 0 to 5.5 v 2.7 to 3.6 5.0 a power-off leakage current i off v in /v out 5.5 v 0 10.0 a v in v cc or gnd 2.7 to 3.6 10.0 quiescent supply current i cc v in 3.6 to 5.5 v 2.7 to 3.6 10.0 increase in icc per input i cc v ih v cc 0.6 v 2.7 to 3.6 500 a
tc74lcx138f/fn/ft 2002-01-11 5 ac characteristics (ta 40 to 85c) characteristics symbol test condition v cc (v) min max unit 2.7 7.0 propagation delay time (a, b, c- y ) t plh t phl figure 1, figure 2 3.3 0.3 1.5 6.0 ns 2.7 8.0 propagation delay time (g1- y ) t plh t phl figure 1, figure 2 3.3 0.3 1.5 7.0 ns 2.7 7.0 propagation delay time ( 2 g - y ) t plh t phl figure 1, figure 2 3.3 0.3 1.5 6.0 ns 2.7 output to output skew t oslh t oshl (note 10) 3.3 0.3 1.0 ns note 10: parameter guaranteed by design. (t oslh |t plhm t plhn |, t oshl |t phlm t phln |) dynamic switching characteristics (ta 25c, input: t r t f 2.5 ns, c l 50 pf, r l 500 ) characteristics symbol test condition v cc (v) typ. unit quiet output maximum dynamic v ol v olp v ih 3.3 v, v il 0 v 3.3 0.8 v quiet output minimum dynamic v ol |v olv | v ih 3.3 v, v il 0 v 3.3 0.8 v capacitive characteristics (ta 25c) characteristics symbol test condition v cc (v) typ. unit input capacitance c in 3.3 7 pf output capacitance c out 0 8 pf power dissipation capacitance c pd f in 10 mhz (note 11) 3.3 25 pf note 11: c pd is defined as the value of the internal equivalent capacitance which is calculated 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
tc74lcx138f/fn/ft 2002-01-11 6 ac test circuit ac waveform 90% 10% output input v ol v oh gnd 2.7 v 1.5 v t plh t phl t f 2.5 ns t r 2.5 ns 1.5 v figure 2 t plh , t phl output measure c l 50 pf r l 500 r l c l figure 1
tc74lcx138f/fn/ft 2002-01-11 7 package dimensions weight: 0.18 g (typ.)
tc74lcx138f/fn/ft 2002-01-11 8 package dimensions weight: 0.12 g (typ.) note: this package is not available in japan.
tc74lcx138f/fn/ft 2002-01-11 9 package dimensions weight: 0.06 g (typ.)
tc74lcx138f/fn/ft 2002-01-11 10 toshiba is continually working to improve the quality and reliability of its products. nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. it is the responsibility of the buyer, when utilizing toshiba products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such toshiba products could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that toshiba products are used within specified operating ranges as set forth in the most recent toshiba products specifications. also, please keep in mind the precautions and conditions set forth in the ?handling guide for semiconductor devices,? or ?toshiba semiconductor reliability handbook? etc.. the toshiba products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). these toshiba products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (?unintended usage?). unintended usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. unintended usage of toshiba products listed in this document shall be made at the customer?s own risk. the products described in this document are subject to the foreign exchange and foreign trade laws. the information contained herein is presented only as a guide for the applications of our products. no responsibility is assumed by toshiba corporation for any infringements of intellectual property or other rights of the third parties which may result from its use. no license is granted by implication or otherwise under any intellectual property or other rights of toshiba corporation or others. the information contained herein is subject to change without notice. 000707eb a restrictions on product use
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