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(R) 74VHCT541A OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) s s s s s s s s s s HIGH SPEED: tPD = 3.6 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 A (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 541 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.9V (Max.) M (Micro Package) T (TSSOP Package) ORDER CODES : 74VHCT541AM 74VHCT41AT input AND such that if either G1 and G2 are high, all eight outputs are in the high impedance state. In order to enhance PC board layout, the AC541 offers a pinout having inputs and outputs on opposite sides of the package. Power down protection is provided on all inputs and outputs 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. DESCRIPTION The VHCT541A is an advanced high speed CMOS OCTAL BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. The 3 STATE control gate operates as a two PIN CONNECTION AND IEC LOGIC SYMBOLS August 1999 1/8 74VHCT541A INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1,19 2, 3, 4,5, 6, 7,8, 9 18, 17, 16, 15, 14, 13, 12, 11 10 20 SYMBOL G1, G2 A1 to A8 Y1 to Y8 NAME AND FUNCT ION Output Enable Input Data Inputs Data Outputs GND VCC Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT G1 H X L L X:"H" or "L" Z: High impedance O UT PUT An X X H L Yn Z Z H L G2 X H L L ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VO VO IIK IOK IO ICC orIGND Tstg TL Supply Voltage DC Input Voltage DC Output Voltage (see note 1) DC Output Voltage (see note 2) DC Input Diode Current DC Output Diode Current DC Output Current DC VCC or Ground Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7.0 -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 V mA mA mA mA o 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. 1) Output in OFF State 2) High or Low State RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VO VO Top dt/dv Supply Voltage Input Voltage Output Voltage (see note 1) Output Voltage (see note 2) Operating Temperature Input Rise and Fall Time (see note 3) (V CC = 5.0 0.5V) Parameter Valu e 4.5 to 5.5 0 to 5.5 0 to 5.5 0 to VCC -40 to +85 0 to 20 Unit V V V V o C ns/V 1) Output in OFF State 2) High or Low State 3)VIN from0.8V to 2 V 2/8 74VHCT541A DC SPECIFICATIONS Symb ol Parameter T est Cond ition s V CC (V) VIH VIL VOH VOL IOZ High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current Additional Worst Case Supply Current Output Leakage Current 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 4.5 to 5.5 IO=-50 A IO=-8 mA IO=50 A IO=8 mA VI = VIH orVIL VO = 0V to 5.5V VI = 5.5V or GND VI = VCC orGND One Input at 3.4V, other input at VCC or GND VOUT = 5.5V 4.4 3.94 0.0 0.1 0.36 0.25 4.5 Min. 2 0.8 4.4 3.8 0.1 0.44 2.5 Typ . Value T A = 25 o C Max. -40 to 85 o C Min . 2 0.8 Max. V V Un it V V A II ICC ICC 0 to 5.5 5.5 5.5 0.1 2 1.35 1.0 20 1.5 A A mA IOPD 0 0.5 5.0 A AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter V CC (V) tPLH tPHL tPLZ tPHZ tPZL tPZH Propagation Delay Time Output Disable Time Output Enable Time 5.0(*) 5.0(*) 5.0(*) 5.0 5.0(*) (*) Test Co ndition CL (pF ) 15 50 15 50 50 RL = 1K RL = 1K Value T A = 25 o C Min. Typ . Max. 5.0 6.9 5.5 7.9 8.3 8.8 9.4 11.3 12.3 11.9 Un it -40 to 85 o C Min . Max. 1.0 8.0 1.0 9.0 1.0 1.0 1.0 13.0 14.0 13.5 ns ns ns (*) Voltage range is 5.0V 0.5V 3/8 74VHCT541A CAPACITIVE CHARACTERISTICS Symb ol Parameter T est Cond ition s Min. CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1) Typ . 4 9 19 Value T A = 25 o C Max. 10 -40 to 85 o C Min . Max. 10 pF pF pF Un it 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 operating current can be obtained by the following equation. ICC(opr) = CPD * VCC * fIN + ICC/8 (per Circuit) DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter T est Cond ition s V CC (V) 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) 5.0 -1.1 5.0 5.0 CL = 50 pF 2.0 0.8 Min. Typ . 0.9 -0.9 V Value T A = 25 o C Max. 1.1 -40 to 85 o C Min . Max. Un it 1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 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 T EST tPLH , tPHL tPZL , tPLZ tPZH , tPHZ CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 1K orequivalent RT = ZOUT of pulse generator (typically 50) SW IT CH Open VCC GND 4/8 74VHCT541A WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/8 74VHCT541A Plastic DIP-20 (0.25) MECHANICAL DATA mm MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.34 8.5 2.54 22.86 7.1 3.93 0.130 0.053 0.254 1.39 0.45 0.25 25.4 0.335 0.100 0.900 0.280 0.155 1.65 TYP. MAX. MIN. 0.010 0.055 0.018 0.010 1.000 0.065 inch TYP. MAX. DIM. P001J 6/8 74VHCT541A SO-20 MECHANICAL DATA DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 7.40 0.50 12.60 10.00 1.27 11.43 7.60 1.27 0.75 8 (max.) 0.291 0.19 13.00 10.65 0.35 0.23 0.50 45 (typ.) 0.496 0.393 0.050 0.450 0.299 0.050 0.029 0.512 0.419 0.10 mm TYP. MAX. 2.65 0.20 2.45 0.49 0.32 0.013 0.009 0.020 0.004 MIN. inch TYP. MAX. 0.104 0.007 0.096 0.019 0.012 P013L 7/8 74VHCT541A 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 (c) 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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