74VHCT244A_04

74VHCT244A OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) s s s s s s s s s s HIGH SPEED: tPD = 5.4 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 244 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.9V (MAX.) SOP TSSOP Table 1: Order Codes PACKAGE SOP TSSOP T&R 74VHCT244AMTR 74VHCT244ATTR DESCRIPTION The 74VHCT244A is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. G enable input governs four BUS BUFFERs. This device is designed to be used with 3 state memory address drivers, etc. 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 74VHCT244A Figure 2: Input Equivalent Circuit Table 2: Pin Description PIN N° 1 2, 4, 6, 8 9, 7, 5, 3 11, 13, 15, 17 18, 16, 14, 12 19 10 20 SYMBOL 1G 1A1 to 1A4 2Y1 to 2Y4 2A1 to 2A4 1Y1 to 1Y4 2G GND VCC NAME AND FUNCTION Output Enable Input Data Inputs Data Outputs Data Inputs Data Outputs Output Enable Input Ground (0V) Positive Supply Voltage Table 3: Truth Table INPUTS G L L H X : Don’t Care Z : High Impedance OUTPUT An L H X Yn L H Z Table 4: Absolute Maximum Ratings Symbol VCC VI VO VO IIK IOK IO 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 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 °C °C ICC or IGND DC VCC or Ground Current 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 74VHCT244A Table 5: 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) (VCC = 5.0 ± 0.5V) Parameter Value 4.5 to 5.5 0 to 5.5 0 to 5.5 0 to VCC -55 to 125 0 to 20 Unit V V V V °C 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 Parameter VCC (V) 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 4.5 to 5.5 0 to 5.5 5.5 5.5 0 IO=-50 µA IO=-8 mA IO=50 µA IO=8 mA VI = VIH or VIL VO = 0V to 5.5V VI = 5.5V or GND VI = VCC or GND One Input at 3.4V, other input at VCC or GND VOUT = 5.5V TA = 25°C Min. 2 0.8 4.4 3.94 0.0 0.1 0.36 ±0.25 ± 0.1 2 1.35 0.5 4.5 4.4 3.8 0.1 0.44 ± 2.5 ± 1.0 20 1.5 5.0 Typ. Max. Value -40 to 85°C Min. 2 0.8 4.4 3.7 0.1 0.55 ± 2.5 ± 1.0 20 1.5 5.0 Max. -55 to 125°C Min. 2 0.8 Max. V V V V µA µA µA mA µA Unit 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 II ICC +ICC IOPD Table 7: AC Electrical Characteristics (Input tr = tf = 3ns) Test Condition Symbol Parameter VCC (*) CL (V) (pF) 5.0 5.0 5.0 5.0 5.0 15 50 15 50 50 RL = 1KΩ RL = 1KΩ TA = 25°C Min. Typ. 5.4 5.9 7.7 8.2 8.8 Max. 7.4 8.4 10.4 11.4 11.4 Value -40 to 85°C Min. 1.0 1.0 1.0 1.0 1.0 Max. 8.5 9.5 12.0 13.0 13.0 -55 to 125°C Min. 1.0 1.0 1.0 1.0 1.0 Max. 8.5 9.5 12.0 13.0 13.0 ns ns ns Unit tPLH tPHL tPLZ tPHZ tPZL tPZH Propagation Delay Time Output Disable Time Output Enable Time (*) Voltage range is 5.0V ± 0.5V 3/12 74VHCT244A Table 8: Capacitive Characteristics Test Condition Symbol Parameter TA = 25°C Min. CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1) Typ. 6 10 18 Max. 10 Value -40 to 85°C Min. Max. 10 -55 to 125°C Min. Max. 10 pF pF pF Unit 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 gate) Table 9: Dynamic Switching Characteristics Test Condition Symbol Parameter VCC (V) 5.0 TA = 25°C Min. Typ. 0.9 -1.1 CL = 50 pF 2.0 -0.9 V Max. 1.1 Value -40 to 85°C Min. Max. -55 to 125°C Min. Max. 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) 5.0 5.0 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 74VHCT244A Figure 3: Test Circuit TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ CL =15/ 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 1KΩ or equivalent RT = ZOUT of pulse generator (typically 50Ω) SWITCH Open VCC GND Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle) 5/12 74VHCT244A Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle) 6/12 74VHCT244A SO-20 MECHANICAL DATA DIM. A A1 B C D E e H h L k ddd 10.00 0.25 0.4 0° mm. MIN. 2.35 0.1 0.33 0.23 12.60 7.4 1.27 10.65 0.75 1.27 8° 0.100 0.394 0.010 0.016 0° TYP MAX. 2.65 0.30 0.51 0.32 13.00 7.6 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 0.050 0.419 0.030 0.050 8° 0.004 inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0016022D 7/12 74VHCT244A TSSOP20 MECHANICAL DATA mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0˚ 0.45 0.60 0.05 0.8 0.19 0.09 6.4 6.2 4.3 6.5 6.4 4.4 0.65 BSC 8˚ 0.75 0˚ 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 6.6 6.6 4.48 0.002 0.031 0.007 0.004 0.252 0.244 0.169 0.256 0.252 0.173 0.0256 BSC 8˚ 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.260 0.260 0.176 inch A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 0087225C 8/12 74VHCT244A Tape & Reel SO-20 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 10.8 13.2 3.1 3.9 11.9 12.8 20.2 60 30.4 11 13.4 3.3 4.1 12.1 0.425 0.520 0.122 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 1.197 0.433 0.528 0.130 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch 9/12 74VHCT244A Tape & Reel TSSOP20 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.8 6.9 1.7 3.9 11.9 12.8 20.2 60 22.4 7 7.1 1.9 4.1 12.1 0.268 0.272 0.067 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.276 0.280 0.075 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch 10/12 74VHCT244A Table 10: Revision History Date 16-Dec-2004 Revision 4 Description of Changes Order Codes Revision - pag. 1. 11/12 74VHCT244A 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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