ST 74VHC244 handbook
Contents
1. PIN N SYMBOL NAME AND FUNCTION 1 1G Output Enable Input 2 4 6 8 1A1 to 1A4 Data Inputs 9 7 5 3 2Y1 to 2Y4 Data Outputs 11 13 15 2A1 to 2A4 Data Inputs 17 18 16 14 1Y1to 1Y4 Data Outputs 12 19 2G Output Enable Input 10 GND Ground 0V SC11940 20 Voc Positive Supply Voltage Table 3 Truth Table INPUTS OUTPUT G An Yn L L L L H H H X Z X Don t Care Z High Impedance Table 4 Absolute Maximum Ratings Symbol Parameter Value Unit Voc Supply Voltage 0 5 to 7 0 V VI DC Input Voltage 0 5 to 7 0 V Vo DC Output Voltage 0 5 to Voc 0 5 V lik DC Input Diode Current 20 mA lok DC Output Diode Current 20 mA lo DC Output Current 25 mA Icc or lenp DC Vec or Ground Current 75 mA Tstg Storage Temperature 65 to 150 C TL Lead Temperature 10 sec 300 C Absolute Maximum Ratings are those values beyond which damage to the device may occur Functional operation under these conditions is not implied Table 5 Recommended Operating Conditions Symbol Parameter Value Unit Voc Supply Voltage 2 to 5 5 V VI Input Voltage 0 to 5 5 V Vo Output Voltage 0 to Voc V Top Operating Temperature 55 to 125 C dt dv Input Rise and Fall Time note 1 wii ae Li nav 1 Vin from 30 to 70 of Vec 2 12 Table 6 DC Specifications 74VHC2442. Test Condition Value Symbol Parameter Ver Ta 25 C 40 to 85 C 55 to 125 C Unit V Min Typ Max Min Max Min Max Vin High Level Input 2 0 1 5 1 5 1 5 MONA E us 07Vcc 07Vcc 07Vcc i ViL Low Level Input 2 0 0 5 0 5 0 5 Og 2D 03Vcc 03Vcc 03Vg V Vou High Level Output 2 0 lo 50 uA 1 9 2 0 1 9 1 9 Voltage 3 0 lo 50 pA 29 30 29 2 9 4 5 lo 50 uA 4 4 4 5 4 4 4 4 V 3 0 lo 4 mA 2 58 2 48 2 4 4 5 lo 8 mA 3 94 3 8 3 7 VoL Low Level Output 2 0 15250 uA 0 0 0 1 0 1 0 1 Voltage 3 0 lo 50 pA 0 0 0 1 0 1 0 1 4 5 15 50 uA 0 0 0 1 0 1 0 1 V 3 0 lo 4 mA 0 36 0 44 0 55 4 5 lo 8 mA 0 36 0 44 0 55 loz High Impedance V Viu or V Output Leakage 5 5 V i V IH Sr GND 0 25 2 5 t25 uA Current o7 CC I Input Leakage 0 to E 4 Guanti 55 Vi 5 5VorGND 04 1 1 uA loc Quiescent Supply E Current 5 5 VI Voc or GND 4 40 40 uA ky 3 12 74VHC244 Table 7 AC Electrical Characteristics Input t t 3ns Test Condition Value Symbol Parameter V C Ty 25 C 40 to 85 C 55 to 125 C Unit cc L V PF Min Typ Max Min Max Min Max tpLH Propagation Delay 3 30 15 5 8 84 1 0 10 0 1 0 10 0 tpa Time 3 30 50 83 119 10 135 10 13 5 ns 5 00 15 3 9 55 1 0 6 5 10 6 5 5 0 50 5 4 7 5 1 0 8 5 1 0 8 5 tpz
3. ddd 0 100 0 004 hx45 o d i d U DA A SN J La C i B lt ddd SEATING 20 1 PLANE C 0 25 mm GAGE PLANE PIN 1 IDENTIFICATION 0016022D 7 12 74VHC244 TSSOP20 MECHANICAL DATA 0 173 0 0256 BSC 8 0 8 L 0 45 0 60 0 75 0 018 0 024 0 030 PIN 1 IDENTIFICATION 0087225C 2 8 12 74VHC244 Tape amp Reel SO 20 MECHANICAL DATA P 11 9 12 1 0 468 0 476 N e Y Y A A A EB Po Bo vuo Le QR Spes dor MU A Ko Ao P ini ei Note Drawing not in scale 9 12 74VHC244 Tape amp Reel TSSOP20 MECHANICAL DATA P 11 9 12 1 0 468 0 476 N iC Y 1 A i i ER Po Bo NN EO Os E i Ko Ao Lok Note Drawing not in scale 10 12 ky Table 11 Revision History 74VHC244 Date Revision Description of Changes 12 Nov 2004 3 Order Codes Revision pag 1 11 12 74VHC244 Inf
4. Output Enable 330 15 RL 1Ka 66 10 6 1 0 125 1 0 12 5 tz Time 3 30 50 RL 1Ko 9 141 10 160 1 0 16 0 ns 5 000 15 RL 1Ke 47 73 10 8 5 1 0 8 5 5 00 50 Rr 1Ko 6 2 9 3 1 0 10 5 1 0 10 5 tpLz Output Disable 3 30 50 Rr 1Ko 10 3 14 0 1 0 16 0 1 0 16 0 ns iPHz Time 500 50 Ri 1Ko 6 7 9 2 10 10 5 1 0 10 5 losLH Outputto Output 3 30 50 1 5 1 5 1 5 tosHL Skew time note 1 5 00 50 1 0 1 0 1 0 bs Voltage range is 3 3V 0 3V Voltage range is 5 0V 0 5V Note 1 Parameter guaranteed by design tsoLH ltpLHm tpLHnl gt tsoHL ltpHLm tpHinl Table 8 Capacitive Characteristics Test Condition Value Symbol Parameter Ta 25 C 40 to 85 C 55 to 125 C Unit Min Typ Max Min Max Min Max Cin Input Capacitance 4 10 10 10 pF Output Cour Capacitance 6 pF Cpp Power Dissipation Capacitance 19 pF note 1 1 Cpp 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 Iccopr Cep X Voc X fin Ioc 8 per circuit 4 12 2 74VHC244 Table 9 Dynamic Switching Characteristics Test Condition Value Symbol Parameter Ver Ta 25 C 40 to 85 C 55
5. SZA 74VHC244 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED HIGH SPEED tpp 3 9 ns TYP at Voc 5V LOW POWER DISSIPATION Icc 4 pA MAX at TA 25 C m HIGH NOISE IMMUNITY Vin Vir 28 Vec MIN POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE lloul lor 8 MA MIN m BALANCED PROPAGATION DELAYS tpLH PHL m OPERATING VOLTAGE RANGE Vcc OPR 2V to 5 5V m PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 244 IMPROVED LATCH UP IMMUNITY LOW NOISE Vo p 0 9V MAX DESCRIPTION The 74VHC244 is an advanced high speed CMOS OCTAL BUS BUFFER 3 STATE fabricated with sub micron silicon gate and double layer metal wiring C MOS technology G output enable governs four BUS BUFFERs This device is designed to be used with 3 state memory address drivers etc Figure 1 Pin Connection And IEC Logic Symbols PC11010 November 2004 Table 1 Order Codes PACKAGE T amp R 7AVACZIANTA TSSOP 74VHC244TTR 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 1 12 74VHC244 Figure 2 Input Equivalent Circuit Table 2 Pin Description
6. to 125 C Unit V Min Typ Max Min Max Min Max Voip Dynamic Low 0 6 0 9 V Voltage Quiet 5 0 V OLV Output note 1 2 0 9 0 6 Dynamic High Viho Voltage Input 5 0 C 50 pF 3 5 V note 1 3 Dynamic Low Vip Voltage Input 5 0 1 5 V note 1 3 1 Worst case package 2 Max number of outputs defined as n Data inputs are driven OV to 5 0V n 1 outputs switching and one output at GND 3 Max number of data inputs n switching n 1 switching OV to 5 0V Inputs under test switching 5 0V to threshold Vj p OV to threshold Vip f 1MHz Table 10 Test Circuit PULSE GENERATOR C11700 TEST SWITCH tpLH tPHL Open tpz1 tpLz Voc tpzH tpuz GND C 15 50pF or equivalent includes jig and probe capacitance RL Ry 1KQ or equivalent R7 Zour of pulse generator typically 500 2 5 12 74VHC244 Figure 3 Waveform Propagation Delays f 1MHz 50 duty cycle 1An 2An SC08561 Figure 4 Waveform Output Enable And Disable Time f 1MHz 50 duty cycle 10 tPZH 1Yn 2Yn tpz 9 1Yn 2Yn SC08550 6 12 74VHC244 SO 20 MECHANICAL DATA
7. ormation 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 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 registered trademark of STMicroelectronics All other names are the property of their respective owners 2004 STMicroelectronics All Rights Reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States of America www st com 12 12 IST
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ST 74VHC244 handbook