74VHC541 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 3.6 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 541 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.9V (Max.) DESCRIPTION The VHC541 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 input AND such that if either G1 and G2 are high, M (Micro Package) T (TSSOP Package) ORDER CODES : 74VHC541M 74VHC541T 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 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 June 1999 1/8 74VHC541 INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1,19 G1, G2 Output Enable Input NAME AND FUNCT ION 2, 3, 4,5, 6, 7,8, 9 A1 to A8 Data Inputs 18, 17, 16, 15, 14, 13, 12, 11 Y1 to Y8 Data Outputs 10 GND Ground (0V) 20 VCC Positive Supply Voltage TRUTH TABLE INPUT O UT PUT G1 G2 An Yn H X X Z X H X Z L L H H L L L L X:”H” or ”L” Z: High impedance ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage VI DC Input Voltage VO DC Output Voltage IIK Value Unit -0.5 to +7.0 V -0.5 to +7.0 V -0.5 to VCC + 0.5 V DC Input Diode Current - 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 25 mA ± 75 mA ICC orIGND Tstg TL DC VCC or Ground Current Storage Temperature 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 VI Input Voltage VO Output Voltage Top Operating Temperature dt/dv 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 2/8 Valu e Unit 2.0 to 5.5 V 0 to 5.5 V 0 to VCC -40 to +85 0 to 100 0 to 20 V o C ns/V ns/V 74VHC541 DC SPECIFICATIONS Symb ol VIH VIL VOH VOL IOZ II ICC Parameter T est Cond ition s Value T A = 25 o C V CC (V) Min. Typ . Un it -40 to 85 o C Max. Min . Max. High Level Input Voltage 2.0 1.5 1.5 3.0 to 5.5 0.7VCC 0.7VCC Low Level Input Voltage 2.0 0.5 0.5 3.0 to 5.5 0.3VCC 0.3VCC High Level Output Voltage Low Level Output Voltage High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current 2.0 IO=-50 µA 1.9 2.0 1.9 3.0 IO=-50 µA 2.9 3.0 2.9 4.5 IO=-50 µA 4.4 4.5 4.4 3.0 IO=-4 mA 2.58 2.48 4.5 IO=-8 mA 3.94 3.8 V V V 2.0 IO=50 µA 0.0 0.1 0.1 3.0 IO=50 µA 0.0 0.1 0.1 4.5 IO=50 µA 0.0 0.1 0.1 V 3.0 IO=4 mA 0.36 0.44 4.5 IO=8 mA 0.36 0.44 ±0.25 ±2.5 µA 5.5 VI = VIH orVIL VO = VCC orGND 0 to 5.5 VI = 5.5V or GND ±0.1 ±1.0 µA 5.5 VI = VCC orGND 4 40 µA AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter V CC (V) Test Co ndition CL (pF ) Value o T A = 25 C Min. Typ . Max. 5.0 7.0 7.5 10.5 3.5 5.0 5.0 7.0 Un it o -40 to 85 C Min . Max. 1.0 8.5 1.0 12.0 1.0 6.0 1.0 8.0 tPLH tPHL Propagation Delay Time 3.3(*) 3.3(*) 5.0(**) 5.0(**) 15 50 15 50 tPZL tPZH Output Enable Time 3.3 3.3(*) (*) 15 50 RL = 1KΩ RL = 1KΩ 6.8 9.3 10.5 14.0 1.0 1.0 12.5 16.0 5.0(**) 5.0(**) 3.3(*) 5.0(**) 3.3(*) 5.0(**) 15 50 50 50 50 RL = 1KΩ RL = 1KΩ RL = 1KΩ RL = 1KΩ 4.7 6.2 11.2 6.0 7.2 9.2 15.4 8.8 1.5 1.0 1.0 1.0 1.0 1.0 8.5 10.5 17.5 10.0 1.5 1.0 tPLZ tPHZ Output Disable Time tOSLH tOSHL Output to Output Skew Time (note 1) 50 ns ns ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V Note 1: Parameter guaranteed by design. tsoLH = |tpLHm- tpLHn|, tsoHL = |tpHLm - tpHLn| 3/8 74VHC541 CAPACITIVE CHARACTERISTICS Symb ol Parameter T est Cond ition s Value T A = 25 o C Min. Un it -40 to 85 o C Typ . Max. Input Capacitance 4 10 COUT Output Capacitance 6 pF CPD Power Dissipation Capacitance (note 1) 18 pF CIN Min . Max. 10 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 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 Dynamic Low Voltage Quiet Output (note 1, 2) 5.0 VIHD Dynamic High Voltage Input (note 1, 3) 5.0 VILD Dynamic Low Voltage Input (note 1, 3) 5.0 VOLP VOLV Value T A = 25 o C V CC (V) Min. -0.9 CL = 50 pF Un it -40 to 85 o C Typ . Max. 0.6 0.9 Min . Max. -0.6 3.5 V 1.5 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 SW IT CH Open tPZL , tPLZ VCC tPZH , tPHZ GND CL = 15/50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 1KΩ orequivalent RT = ZOUT of pulse generator (typically 50Ω) 4/8 74VHC541 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/8 74VHC541 Plastic DIP-20 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.254 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.010 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 D 25.4 1.000 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 0.280 I 3.93 0.155 L Z 3.3 0.130 1.34 0.053 P001J 6/8 74VHC541 SO-20 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 2.65 0.10 0.104 0.20 a2 MAX. 0.004 0.007 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 C 0.50 0.020 c1 45 (typ.) D 12.60 13.00 0.496 0.512 E 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 11.43 0.450 F 7.40 7.60 0.291 0.299 L 0.50 1.27 0.19 0.050 M S 0.75 0.029 8 (max.) P013L 7/8 74VHC541 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. 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