74VHCT541A OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.1 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C 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.) DESCRIPTION The 74VHCT541A 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 two input AND such that if either G1 and G2 are high, all eight outputs are in the high impedance state. SOP TSSOP Table 1: Order Codes PACKAGE T&R SOP TSSOP 74VHCT541AMTR 74VHCT541ATTR In order to enhance PC board layout, the 74VHCT541 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 since all inputs are equipped with TTL threshold. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. Figure 1: Pin Connection And IEC Logic Symbols December 2004 Rev. 4 1/12 74VHCT541A Figure 2: Input Equivalent Circuit Table 2: Pin Description PIN N° SYMBOL 1, 19 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 10 20 G1, G2 A1 to A8 Output Enable Inputs Data Inputs Y1 to Y8 Data Outputs GND VCC NAME AND FUNCTION Ground (0V) Positive Supply Voltage Table 3: Truth Table INPUT OUTPUT G1 G2 An Yn H X L L X H L L X X H L Z Z H L X : Don’t Care Z : High impedance Table 4: Absolute Maximum Ratings Symbol VCC Parameter Value Unit 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 Tstg Storage Temperature TL Lead Temperature (10 sec) ± 50 mA -65 to +150 °C 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) Output in OFF State 2) High or Low State 2/12 74VHCT541A Table 5: Recommended Operating Conditions Symbol VCC Parameter Supply Voltage Value Unit 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) Top Operating Temperature dt/dv Input Rise and Fall Time (see note 3) (VCC = 5.0 ± 0.5V) 0 to VCC V -55 to 125 °C 0 to 20 ns/V 1) Output in OFF State 2) High or Low State 3) VIN from 0.8V to 2V Table 6: DC Specifications Test Condition Symbol VIH VIL VOH VOL IOZ II ICC +ICC IOPD Parameter 4.5 to 5.5 4.5 to 5.5 Low Level Output Voltage High Impedance Output Leakage Current Input Leakage Current Quiescent Supply Current Additional Worst Case Supply Current Output Leakage Current TA = 25°C VCC (V) High Level Input Voltage Low Level Input Voltage High Level Output Voltage Value Min. Typ. Max. 2 -40 to 85°C -55 to 125°C Min. Min. 2 0.8 4.5 IO=-50 µA 4.4 4.5 IO=-8 mA 3.94 4.5 IO=50 µA 4.5 Max. 4.5 0.0 Max. 2 0.8 V 0.8 4.4 4.4 3.8 3.7 Unit V V 0.1 0.1 0.1 IO=8 mA 0.36 0.44 0.55 4.5 to 5.5 VI = VIH or VIL VO = 0V to 5.5V ±0.25 ± 2.5 ± 2.5 µA 0 to 5.5 VI = 5.5V or GND ± 0.1 ± 1.0 ± 1.0 µA 5.5 VI = VCC or GND 4 40 40 µA 5.5 One Input at 3.4V, other input at VCC or GND 1.35 1.5 1.5 mA 0 VOUT = 5.5V 0.5 5.0 5.0 µA V Table 7: AC Electrical Characteristics (Input tr = tf = 3ns) Test Condition Symbol Parameter Value TA = 25°C VCC (*) CL (V) (pF) Min. -40 to 85°C -55 to 125°C Unit Typ. Max. Min. Max. Min. Max. 4.1 6.2 6.0 8.5 1.0 1.0 6.5 9.5 1.0 1.0 6.5 9.5 ns tPLH tPHL Propagation Delay Time 5.0 5.0 15 50 tPZL tPZH Output Disable Time 5.0 5.0 15 50 RL = 1KΩ 5.0 7.5 7.0 10.0 1.0 1.0 8.0 12.0 1.0 1.0 8.0 12.0 ns tPLZ tPHZ Output Enable Time 5.0 50 RL = 1KΩ 7.0 10.0 1.0 12.0 1.0 12.0 ns (*) Voltage range is 5.0V ± 0.5V 3/12 74VHCT541A Table 8: Capacitive Characteristics Test Condition Symbol Value TA = 25°C Parameter Min. CIN Input Capacitance COUT Output Capacitance Power Dissipation Capacitance (note 1) CPD Typ. Max. 6 10 -40 to 85°C -55 to 125°C Min. Min. Max. 10 Unit Max. 10 pF 8 pF 16 pF 1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit) Table 9: Dynamic Switching Characteristics Test Condition Symbol VOLP VOLV VIHD VILD Parameter Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3) TA = 25°C VCC (V) Min. 5.0 5.0 5.0 Value -1.1 CL = 50 pF Typ. Max. 0.9 1.1 -40 to 85°C -55 to 125°C Min. Min. Max. Unit Max. -0.9 2.0 V 0.8 1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.0V, (n-1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.0V. Inputs under test switching: 3.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. 4/12 74VHCT541A Figure 3: Test Circuit TEST SWITCH tPLH, tPHL Open tPZL, tPLZ VCC tPZH, tPHZ GND CL =15/50pF or equivalent (includes jig and probe capacitance) RL = R1 = 1KΩ or equivalent RT = ZOUT of pulse generator (typically 50Ω) Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle) 5/12 74VHCT541A Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle) 6/12 74VHCT541A SO-20 MECHANICAL DATA DIM. mm. MIN. TYP inch MAX. MIN. TYP. MAX. A 2.35 2.65 0.093 0.104 A1 0.1 0.30 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.60 13.00 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10.00 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 k 0° 8° 0° 8° ddd 0.100 0.004 0016022D 7/12 74VHCT541A TSSOP20 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. A MIN. TYP. MAX. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 6.4 6.5 6.6 0.252 0.256 0.260 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 1 e 0.65 BSC K 0˚ L 0.45 A 0.0256 BSC 0.60 8˚ 0˚ 0.75 0.018 8˚ 0.024 0.030 A2 A1 b K e L E c D E1 PIN 1 IDENTIFICATION 1 0087225C 8/12 74VHCT541A Tape & Reel SO-20 MECHANICAL DATA mm. inch DIM. MIN. A TYP MAX. MIN. 330 MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 TYP. 0.504 30.4 0.519 1.197 Ao 10.8 11 0.425 0.433 Bo 13.2 13.4 0.520 0.528 Ko 3.1 3.3 0.122 0.130 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 9/12 74VHCT541A Tape & Reel TSSOP20 MECHANICAL DATA mm. inch DIM. MIN. A MAX. MIN. 330 13.2 TYP. MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 10/12 TYP 0.504 22.4 0.519 0.882 Ao 6.8 7 0.268 0.276 Bo 6.9 7.1 0.272 0.280 Ko 1.7 1.9 0.067 0.075 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 74VHCT541A Table 10: Revision History Date Revision 16-Dec-2004 4 Description of Changes Order Codes Revision - pag. 1. 11/12 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. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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