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 74VHC125 QUAD BUS BUFFERS (3-STATE) PRELIMINARY DATA n HIGH SPEED: tPD = 3.8 ns (TYP.) at VCC = 5V n LOW POWER DISSIPATION: ICC = 4 m A (MAX.) at TA = 25 oC n HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) n POWER DOWN PROTECTION ON INPUTS n SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) n BALANCED PROPAGATION DELAYS: tPLH @ tPHL n OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 5.5V n PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 125 IMPROVED LATCH-UP IMMUNITY n n LOW NOISE: VOLP = 0.8V (Max.) DESCRIPTION The 74VHC125 is an advanced high-speed CMOS QUAD BUS BUFFERS fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. PIN CONNECTION AND IEC LOGIC SYMBOLS M T (Micro Package) (TSSOP Package) ORDER CODES : 74VHC125M 74VHC125T This device requires the 3-STATE control input G to be set high to place the output into the high impedance state. 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. June 1999 1/8

74VHC125 INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1, 4, 10, 13 2, 5, 9, 12 3, 6, 8, 11 7 14 SYMBOL NAME AND FUNCTION 1G to 4G Output Enable Inputs 1A to 4A 1Y to 4Y Data Inputs Data Outputs Ground (0V) Positive Supply Voltage GND VCC TRUTH TABLE A X L H X:”H” or ”L” Z: High Impedance G H L L Y Z L H Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 - 20 ± 20 ± 25 ± 50 -65 to +150 300 Unit V V V mA mA mA mA oC oC ABSOLUTE MAXIMUM RATINGS Symbol Parameter VCC VI VO IIK IOK IO Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current ICC or IGND DC VCC or Ground Current Tstg TL Storage Temperature Lead Temperature (10 sec) Absolute Maximum Ratingsarethose values beyond which damage to the device may occur. Functional operation under these condition is not implied. RECOMMENDED OPERATING CONDITIONS Symbol Parameter VCC VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time (see note 1) (VCC = 3.3 ± 0.3V) (V CC = 5.0 ± 0.5V) 1) VIN from 30% to70%of VCC Value 2.0 to 5.5 0 to 5.5 0 to VCC -40 to +85 0 to 100 0 to 20 Unit V V V oC ns/V ns/V 2/8

DC SPECIFICATIONS Symbol Parameter Test Conditions Value Unit 74VHC125 VIH VIL VOH High Level Input Voltage Low Level Input Voltage High Level Output Voltage VOL Low Level Output Voltage IOZ II ICC High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current V CC (V) 2.0 3.0 to 5.5 2.0 3.0 to 5.5 2.0 3.0 4.5 3.0 4.5 2.0 3.0 4.5 3.0 4.5 5.5 IO=-50 m A IO=-50 m A IO=-50 m A IO=-4 mA IO=-8 mA IO=50 m A IO=50 m A IO=50 m A IO=4 mA IO=8 mA VI = VIH or VIL VO = VCC or GND 0 to 5.5 5.5 VI = 5.5V or GND VI = VCC or GND Min. 1.5 0.7VCC 1.9 2.9 4.4 2.58 3.94 TA = 25 oC -40 to 85 oC Typ. Max. Min. Max. 2.0 3.0 4.5 0.0 0.0 0.0 1.5 0.7VCC 0.5 0.3VCC 0.5 0.3VCC 1.9 2.9 4.4 2.48 3.8 0.1 0.1 0.1 0.36 0.36 ±0.25 ±0.1 4 0.1 0.1 0.1 0.44 0.44 ±2.5 ±1.0 40 V V V V m A m A m A AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns) Symbol Parameter Test Condition Value Unit tPLH tPHL Propagation Delay Time Output Disable Time tPLZ tPHZ Output Enable Time tPZL tPZH (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V V CC (V) 3.3(*) 3.3(*) 5.0(**) 5.0(**) 3.3(*) 3.3(*) 5.0(**) 5.0(**) 3.3(*) 5.0(**) CL (pF) 15 50 15 50 15 50 15 50 50 50 RL = 1KW RL = 1KW RL = 1KW RL = 1KW RL = 1KW RL = 1KW TA = 25 oC Min. -40 to 85 oC Typ. Max. Min. Max. 9.5 5.6 13.0 8.1 3.8 6.5 8.5 5.3 9.5 5.4 13.0 7.9 3.6 6.0 8.0 5.1 15.0 9.5 6.1 10.0 8.0 11.5 5.5 7.5 8.0 11.5 5.1 7.1 13.2 8.8 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 ns ns ns 3/8

74VHC125 CAPACITIVE CHARACTERISTICS Symbol Parameter Test Conditions Value Unit Input Capacitance CIN COUT Output Capacitance CPD Power Dissipation Capacitance (note 1) Min. 4 6 14 TA = 25 oC -40 to 85 oC Typ. Max. Min. Max. 10 10 pF pF 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 bythe followingequation. ICC(opr) = CPD • VCC • fIN + ICC/4(per circuit) DYNAMIC SWITCHING CHARACTERISTICS Symbol Parameter Test Conditions Value Unit VOLP VOLV VIHD VILD Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3) V CC (V) 5.0 5.0 5.0 Min. -0.8 3.5 CL = 50 pF TA = 25 oC -40 to 85 oC Typ. Max. Min. Max. 0.3 -0.3 0.8 V 1.5 1) Worst case package. 2) Max number of outputs defined as (n). Data inputs aredriven 0V to 5.0V, (n -1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. TEST CIRCUIT TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 1KW orequivalent RT = ZOUT of pulse generator (typically 50W ) 4/8 SWITCH Open VCC GND

WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) 74VHC125 WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/8

74VHC125 DIM. A a1 a2 b b1 C c1 D E e e3 F G L M S 6/8 SO-14 MECHANICAL DATA mm TYP. 0.5 1.27 7.62 MIN. 0.1 0.35 0.19 8.55 5.8 3.8 4.6 0.5 inch TYP. 0.019 0.050 0.300 MIN. 0.003 0.013 0.007 0.336 0.228 0.149 0.181 0.019 MAX. 1.75 0.2 1.65 0.46 0.25 8.75 6.2 4.0 5.3 1.27 0.68 45 (typ.) 8 (max.) MAX. 0.068 0.007 0.064 0.018 0.010 0.344 0.244 0.157 0.208 0.050 0.026 P013G

74VHC125 TSSOP14 MECHANICAL DATA DIM. A A1 A2 b c D E E1 e K L MIN. 0.05 0.85 0.19 0.09 4.9 6.25 4.3 0o 0.50 A A2 A1 b mm TYP. 0.10 0.9 5 6.4 4.4 0.65 BSC 4o 0.60 e D MAX. MIN. 1.1 0.15 0.95 0.30 0.20 5.1 6.5 4.48 8o 0.70 0.002 0.335 0.0075 0.0035 0.193 0.246 0.169 0o 0.020 inch TYP. 0.004 0.354 0.197 0.252 0.173 0.0256 BSC 4o 0.024 MAX. 0.433 0.006 0.374 0.0118 0.0079 0.201 0.256 0.176 8o 0.028 c K L E E1 PIN 1 IDENTIFICATION 1 7/8

74VHC125 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. 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 trademark of STMicroelectronics  1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com . 8/8

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