74LVX138 LOW VOLTAGE 3 TO 8 LINE DECODER (INV.) WITH 5V TOLERANT INPUTS HIGH SPEED: tPD = 5.5 ns (TYP.) at VCC = 3.3V 5V TOLERANT INPUTS POWER-DOWN PROTECTION ON INPUTS INPUT VOLTAGE LEVEL: VIL = 0.8V, VIH = 2V at VCC = 3V LOW POWER DISSIPATION: ICC = 4 A (MAX.) at TA = 25 oC LOW NOISE: VOLP = 0.3 V (TYP.) at VCC = 3.3V SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 3.6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 138 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The LVX138 is a low voltage CMOS 3 TO 8 LINE DECODER (INVERTING) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power and low noise 3.3V applications. If the device is enabled, 3 binary select inputs (A, B and C) determine which one of the outputs will M1 (Micro Package) T (TSSOP Package) ORDER CODES : 74LVX138M 74LVX138T go low. If enable input G1 is held low or either G2A or G2B is held high, the decoding function is inhibited and all the 8 outputs go high. Three enable inputs are provided to ease cascade connection and application of address decoders for memory systems. It has better speed performance at 3.3V than 5V LSTTL family combinad with the true CMOS low power consumption. Power down protection is provided on all inputs and 0 to 7V can be accepted on inputs with no regard to the supply voltage. This device can be used to interface 5V to 3V. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS April 1999 1/9 74LVX138 INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1, 2, 3 A, B, C NAME AND FUNCT ION 4, 5 G2A, G2B Enable Inputs 6 G1 Enable Input 15, 14, 13, 12, 11, 10, 9, 7 Y0 to Y7 8 GND Ground (0V) 16 VCC Positive Supply Voltage Address Inputs Outputs TRUTH TABLE INPUT S ENABL E G2B G2A G1 C X X L X X H X X H X X X L L H L L L H L L L H L L L H L L L H H L L H H L L H H L L H H OUTPUTS SELECT B X X X L L H H L L H H A X X X L H L H L H L H X:Don't Care LOGIC DIAGRAM Thislogic diagram has notbe used to esimate propagation delays 2/9 Y0 H H H L H H H H H H H Y1 H H H H L H H H H H H Y2 H H H H H L H H H H H Y3 H H H H H H L H H H H Y4 H H H H H H H L H H H Y5 H H H H H H H H L H H Y6 H H H H H H H H H L H Y7 H H H H H H H H H H L 74LVX138 ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage VI DC Input Voltage VO DC Output Voltage Value Unit -0.5 to +7.0 V -0.5 to 7.0 V -0.5 to VCC + 0.5 V IIK DC Input Diode Current - 20 mA IOK DC Output Diode Current 20 mA IO DC Output Current 25 mA 50 mA ICC or IGND DC VCC or Ground Current Tstg Storage Temperature TL Lead Temperature (10 sec) -65 to +150 o 300 o C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage (note 1) Valu e Unit 2 to 3.6 V V VI Input Voltage 0 to 5.5 VO Output Voltage 0 to VCC Top dt/dv Operating Temperature: Input Rise and Fall Time (VCC = 3V) (note 2) -40 to +85 0 to 100 V o C ns/V 1) Truth Table guaranteed: 1.2V to 3.6V 2) VIN from 0.8V to 2V 3/9 74LVX138 DC SPECIFICATIONS Symb ol VIH VIL Parameter High Level Input Voltage Low Level Input Voltage Test Co nditions Valu e T A = 25 oC Min. 2.0 1.5 1.5 3.0 2.0 2.0 3.6 2.4 T yp. Max. ICC V 2.4 0.5 3.0 0.8 0.8 0.8 0.8 High Level Output Voltage 2.0 Low Level Output Voltage 2.0 3.0 3.0 VI = V IH or V IL I O =-50 A 1.9 2.0 1.9 IO=-50 A 2.9 3.0 2.9 IO=-4 mA 2.58 VI(*) = VIH or VIL IO=50 A 0.0 0.1 0.1 IO=50 A 0.0 0.1 0.1 (* ) V V 2.48 IO=4 mA V 0.36 0.44 Input Leakage Current 3.6 VI = 5V or GND 0.1 1 A Quiescent Supply Current 3.6 VI = VCC or GND 2 20 A 3.0 II Max. 0.5 3.0 VOL Min. 2.0 3.6 VOH Un it -40 to 85 o C V CC (V) (*) All outputs loaded. DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter Test Co nditions Dynamic Low Voltage Quiet Output (note 1, 2) 3.3 VIHD Dynamic High Voltage Input (note 1, 3) 3.3 VILD Dynamic Low Voltage Input (note 1, 3) 3.3 VOLP VOLV Valu e o -40 to 85 C Min. T yp. Max. 0.3 0.5 -0.5 -0.3 2 C L = 50 pF Un it o T A = 25 C V CC (V) Min. Max. V 0.8 1) Worst case package 2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n -1) outputs switching and one output at GND 3) max number of data inputs (n) switching. (n-1) switching 0V to3.3V. Inputs under test switching: 3.3V to threshold (VILD), 0V to threshold (VIHD). f=1MHz 4/9 74LVX138 AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter T est Con ditio n CL (p F) V CC (V) tPLH tPHL Propagation Delay Time A, B, C to Y tPLH tPHL Propagation Delay Time G1 to Y tPLH tPHL Propagation Delay Time G2A or G2B to Y tOSLZ tOSHL Output to Output Skew Time (note 1, 2) Valu e T A = 25 oC -40 to 85 o C Min. T yp. Max. Min. Max. 7.1 13.8 1.0 16.5 2.7 15 2.7 3.3(*) 3.3(*) 2.7 2.7 50 15 50 15 50 9.6 5.5 8.0 8.7 11.2 17.3 8.8 12.3 16.3 19.8 1.0 1.0 1.0 1.0 1.0 20.0 10.5 14.0 19.5 23.0 3.3 3.3(*) (*) 15 50 6.8 9.3 10.6 14.1 1.0 1.0 12.5 16.0 2.7 2.7 3.3(*) 3.3(*) 2.7 15 50 15 50 50 8.8 11.3 6.9 9.4 0.5 16.0 19.5 10.4 13.9 2.5 1.0 1.0 1.0 1.0 18.5 22.0 11.5 15.0 2.5 (*) 50 0.5 2.5 3.3 Un it ns ns ns ns 2.5 1) Skew is defined as the absolute value of the difference between the actual propagation delay for any twooutputs of the same device switching in the same direction, either HIGH or LOW 2) Parameter guaranteed by design (*) Voltage range is 3.3V 0.3V CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Co nditions T A = 25 C V CC (V) C IN Input Capacitance 3.3 CPD Power Dissipation Capacitance (note 1) 3.3 Valu e o Min. fIN = 10 MHz T yp. Max. Un it o -40 to 85 C Min. Max. 4 pF 34 pF 1) CPD isdefined as the value of the IC'sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operting current can be obtained by the following equation. ICC(opr) = CPD * VCC * fIN + ICC TEST CIRCUIT CL = 50 pF or equivalent (includes jigand probe capacitance) RT = ZOUT of pulse generator (typically 50) 5/9 74LVX138 WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING OUTPUTS (f=1MHz; duty cycle 50%) WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING OUTPUTS (f=1MHz; duty cycle 50%) 6/9 74LVX138 SO-16 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45 (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 e3 0.050 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8 (max.) P013H 7/9 74LVX138 TSSOP16 MECHANICAL DATA mm DIM. MIN. inch TYP. A MAX. MIN. MAX. 1.1 0.433 A1 0.05 0.10 0.15 0.002 0.004 0.006 A2 0.85 0.9 0.95 0.335 0.354 0.374 b 0.19 0.30 0.0075 0.0118 c 0.09 0.20 0.0035 0.0079 D 4.9 5 5.1 0.193 0.197 0.201 E 6.25 6.4 6.5 0.246 0.252 0.256 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 BSC 0.0256 BSC K 0o 4o 8o 0o 4o 8o L 0.50 0.60 0.70 0.020 0.024 0.028 A A2 A1 b e K c E1 PIN 1 IDENTIFICATION 1 L E D 8/9 TYP. 74LVX138 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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