74VHCT138A 3 TO 8 LINE DECODER (INVERTING) (cid:1) HIGH SPEED: tPD = 7.6 ns (TYP.) at VCC = 5V (cid:1) LOW POWER DISSIPATION: I = 4 µA (MAX.) at T =25°C CC A (cid:1) COMPATIBLE WITH TTL OUTPUTS: V = 2V (MIN.), V = 0.8V (MAX) IH IL (cid:1) POWER DOWN PROTECTION ON INPUTS & OUTPUTS SOP TSSOP (cid:1) SYMMETRICAL OUTPUT IMPEDANCE: |I | = I = 8 mA (MIN) OH OL Table 1: Order Codes (cid:1) BALANCED PROPAGATION DELAYS: t ≅ t PLH PHL PACKAGE T & R (cid:1) OPERATING VOLTAGE RANGE: SOP 74VHCT138AMTR V (OPR) = 4.5V to 5.5V CC TSSOP 74VHCT138ATTR (cid:1) PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 138 (cid:1) IMPROVED LATCH-UP IMMUNITY The three enable inputs are provided to ease (cid:1) LOW NOISE: VOLP = 0.8V (MAX.) cascade connection and application of address decoders for memory systems. DESCRIPTION Power down protection is provided on all inputs The 74VHCT138A is an advanced high-speed and outputs and 0 to 7V can be accepted on CMOS 3 TO 8 LINE DECODER (INVERTING) inputs with no regard to the supply voltage. This fabricated with sub-micron silicon gate and device can be used to interface 5V to 3V since all double-layer metal wiring C2MOS technology. inputs are equipped with TTL threshold. If the device is enabled, 3 binary select inputs (A, All inputs and outputs are equipped with B, and C) determine which one of the outputs will protection circuits against static discharge, giving go low. When enable input G1 is held low or either them 2KV ESD immunity and transient excess G2A or G2B is held high, the decoding function is voltage. inhibited and all the 8 outputs go to high. Figure 1: Pin Connection And IEC Logic Symbols Rev. 3 December 2004 1/12

74VHCT138A Figure 2: Input Equivalent Circuit Table 2: Pin Description PIN N° SYMBOL NAME AND FUNCTION 1, 2, 3 A, B, C Address Inputs 4, 5 G2A, G2B Enable Inputs 6 G1 Enable Input 15, 14, 13, Y0 to Y7 Outputs 12, 11, 10, 9, 7 8 GND Ground (0V) 16 V Positive Supply Voltage CC Table 3: Truth Table INPUTS OUTPUTS ENABLE SELECT G2B G2A G1 C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X L X X X H H H H H H H H X H X X X X H H H H H H H H H X X X X X H H H H H H H H L L H L L L L H H H H H H H L L H L L H H L H H H H H H L L H L H L H H L H H H H H L L H L H H H H H L H H H H L L H H L L H H H H L H H H L L H H L H H H H H H L H H L L H H H L H H H H H H L H L L H H H H H H H H H H H L X : Don’t Care Figure 3: Logic Diagram This logic diagram has not be used to estimate propagation delays 2/12

74VHCT138A Table 4: Absolute Maximum Ratings Symbol Parameter Value Unit VCC Supply Voltage -0.5 to +7.0 V VI DC Input Voltage -0.5 to +7.0 V VO DC Output Voltage (see note 1) -0.5 to +7.0 V VO DC Output Voltage (see note 2) -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 ICC or IGND DC VCC or Ground Current ± 50 mA Tstg Storage Temperature -65 to +150 °C TL Lead Temperature (10 sec) 300 °C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied 1) V = 0V CC 2) High or Low State Table 5: Recommended Operating Conditions Symbol Parameter Value Unit VCC Supply Voltage 4.5 to 5.5 V VI Input Voltage 0 to 5.5 V VO Output Voltage (see note 1) 0 to 5.5 V VO Output Voltage (see note 2) 0 to VCC V Top Operating Temperature -55 to 125 °C dt/dv Input Rise and Fall Time (see note 3) (VCC = 5.0 ± 0.5V) 0 to 20 ns/V 1) V = 0V CC 2) High or Low State 3) V from 0.8V to 2V IN 3/12

74VHCT138A Table 6: DC Specifications Test Condition Value Symbol Parameter V TA = 25°C -40 to 85°C -55 to 125°C Unit CC (V) Min. Typ. Max. Min. Max. Min. Max. V High Level Input 4.5 to IH 2 2 2 V Voltage 5.5 V Low Level Input 4.5 to IL 0.8 0.8 0.8 V Voltage 5.5 VOH High Level Output 4.5 IO=-50 µA 4.4 4.5 4.4 4.4 Voltage V 4.5 IO=-8 mA 3.94 3.8 3.7 VOL Low Level Output 4.5 IO=50 µA 0.0 0.1 0.1 0.1 Voltage V 4.5 IO=8 mA 0.36 0.44 0.55 I Input Leakage 0 to I Current 5.5 VI = 5.5V or GND ± 0.1 ± 1.0 ± 1.0 µA I Quiescent Supply CC Current 5.5 VI = VCC or GND 4 40 40 µA +I Additional Worst One Input at 3.4V, CC Case Supply 5.5 other input at VCC 1.35 1.5 1.5 mA Current or GND I Output Leakage OPD Current 0 VOUT = 5.5V 0.5 5.0 5.0 µA Table 7: AC Electrical Characteristics (Input t = t = 3ns) r f Test Condition Value Symbol Parameter V C TA = 25°C -40 to 85°C -55 to 125°C Unit CC L (V) (pF) Min. Typ. Max. Min. Max. Min. Max. tPLH Propagation Delay 5.0(*) 15 7.6 10.4 1.0 12.0 1.0 12.0 t Time ns PHL A, B, C, to Y 5.0(*) 50 8.1 11.4 1.0 13.0 1.0 13.0 tPLH Propagation Delay 5.0(*) 15 6.6 9.1 1.0 10.5 1.0 10.5 t Time ns PHL G1 to Y 5.0(*) 50 7.1 10.1 1.0 11.5 1.0 11.5 tPLH Propagation Delay 5.0(*) 15 7.0 9.6 1.0 11.0 1.0 11.0 t Time ns PHL G2A, G2B to Y 5.0(*) 50 7.5 10.6 1.0 12.0 1.0 12.0 (*) Voltage range is 5.0V ± 0.5V Table 8: Capacitive Characteristics Test Condition Value Symbol Parameter TA = 25°C -40 to 85°C -55 to 125°C Unit Min. Typ. Max. Min. Max. Min. Max. CIN Input Capacitance 6 10 10 10 pF C Power Dissipation PD Capacitance 36 pF (note 1) 1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without PD load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC 4/12

74VHCT138A Figure 4: Test Circuit C =15/50pF or equivalent (includes jig and probe capacitance) L R = Z of pulse generator (typically 50Ω) T OUT Figure 5: Waveform - Propagation Delays For Inverting Outputs (f=1MHz; 50% duty cycle) 5/12

74VHCT138A Figure 6: Waveform - Propagation Delays For Non-inverting Outputs (f=1MHz; 50% duty cycle) 6/12

74VHCT138A SO-16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 1.75 0.068 a1 0.1 0.25 0.004 0.010 a2 1.64 0.063 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 0.050 e3 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 0.62 0.024 S 8° (max.) 0016020D 7/12

74VHCT138A TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 1.2 0.047 A1 0.05 0.15 0.002 0.004 0.006 A2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 4.9 5 5.1 0.193 0.197 0.201 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 BSC 0.0256 BSC K 0˚ 8˚ 0˚ 8˚ L 0.45 0.60 0.75 0.018 0.024 0.030 A A2 K L A1 b e c E D E1 PIN 1 IDENTIFICATION 1 0080338D 8/12

74VHCT138A Tape & Reel SO-16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 0.882 Ao 6.45 6.65 0.254 0.262 Bo 10.3 10.5 0.406 0.414 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 9/12

74VHCT138A Tape & Reel TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 0.882 Ao 6.7 6.9 0.264 0.272 Bo 5.3 5.5 0.209 0.217 Ko 1.6 1.8 0.063 0.071 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 10/12

74VHCT138A Table 9: Revision History Date Revision Description of Changes 16-Dec-2004 3 Order Codes Revision - pag. 1. 11/12

74VHCT138A 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. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners © 2004 STMicroelectronics - All Rights Reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 12/12