74LVC245A LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER (NOT INVERTED) HIGH PERFORMANCE ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 5V TOLERANT INPUTS HIGH SPEED: tPD = 6.3ns (MAX.) at VCC = 3V POWER DOWN PROTECTION ON INPUTS AND OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN) at VCC = 3V PCI BUS LEVELS GUARANTEED AT 24 mA BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC(OPR) = 1.65V to 3.6V (1.2V Data Retention) PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 245 LATCH-UP PERFORMANCE EXCEEDS 500mA (JESD 17) ESD PERFORMANCE: HBM > 2000V (MIL STD 883 method 3015); MM > 200V DESCRIPTION The 74LVC245A is a low voltage CMOS OCTAL BUS TRANSCEIVER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for 1.65 to 3.6 VCC operations and low power and low noise applications. This IC is intended for two-way asynchronous communication between data buses and the SOP TSSOP ORDER CODES PACKAGE TUBE T&R SOP TSSOP 74LVC245AM 74LVC245AMTR 74LVC245ATTR direction of data transmission is determined by DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated. It has more speed performance at 3.3V than 5V AC/ACT family, combined with a lower power consumption. All inputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. All floating bus terminals during High Z State must be held HIGH or LOW. PIN CONNECTION AND IEC LOGIC SYMBOLS February 2002 . 1/9 74LVC245A INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE PIN No SYMBOL 1 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 DIR A1 to A8 Directional Control Data Inputs/Outputs B1 to B8 Data Inputs/Outputs G GND VCC NAME AND FUNCTION Output Enable Input Ground (0V) Positive Supply Voltage INPUTS FUNCTION G DIR L L H L H X A BUS B BUS OUTPUT INPUT INPUT OUTPUT Z Z OUTPUT Yn A=B B=A Z X : Don’t Care Z : High Impedance ABSOLUTE MAXIMUM RATINGS Symbol Value Unit Supply Voltage -0.5 to +7.0 V VI DC Input Voltage -0.5 to +7.0 V VO DC Output Voltage (High Impedance or VCC = 0V) VO DC Output Voltage (High or Low State) (note 1) IIK VCC Parameter -0.5 to +7.0 V -0.5 to VCC + 0.5 V DC Input Diode Current - 50 mA IOK DC Output Diode Current (note 2) - 50 mA IO DC Output Current ± 50 mA ± 100 mA ICC or IGND DC VCC or Ground Current per Supply Pin Tstg Storage Temperature TL Lead Temperature (10 sec) -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) IO absolute maximum rating must be observed 2) VO < GND 2/9 74LVC245A RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Value Supply Voltage (note 1) Unit 1.65 to 3.6 V 0 to 5.5 V VI Input Voltage VO Output Voltage (High Impedance or VCC = 0V) 0 to 5.5 V VO Output Voltage (High or Low State) 0 to VCC V IOH, IOL High or Low Level Output Current (VCC = 3.0 to 3.6V) ± 24 mA IOH, IOL High or Low Level Output Current (VCC = 2.7 to 3.0V) ± 12 mA IOH, IOL High or Low Level Output Current (VCC = 2.3 to 2.7V) ±8 mA IOH, IOL High or Low Level Output Current (VCC = 1.65 to 2.3V) ±4 mA Top dt/dv Operating Temperature Input Rise and Fall Time (note 2) -55 to 125 °C 0 to 10 ns/V 1) Truth Table guaranteed: 1.2V to 3.6V 2) VIN from 0.8V to 2V at VCC = 3.0V DC SPECIFICATIONS Test Condition Symbol VIH VIL VOH VOL II Ioff IOZ ICC ∆ICC Parameter Value -40 to 85 °C -55 to 125 °C Unit VCC (V) Min. High Level Input Voltage 1.65 to 1.95 0.65VCC 0.65VCC 2.3 to 2.7 2.7 to 3.6 1.7 2 1.7 2 Low Level Input Voltage 1.65 to 1.95 0.35VCC 0.35VCC 2.3 to 2.7 2.7 to 3.6 0.7 0.8 0.7 0.8 High Level Output Voltage 1.65 to 3.6 IO=-100 µA VCC-0.2 VCC-0.2 1.65 IO=-4 mA 1.2 1.2 2.3 IO=-8 mA 1.7 1.7 2.7 IO=-12 mA 2.2 2.2 3.0 IO=-18 mA 2.4 2.4 3.0 IO=-24 mA 2.2 2.2 1.65 to 3.6 IO=100 µA 0.2 0.2 1.65 IO=4 mA 0.45 0.45 2.3 IO=8 mA 0.7 0.7 2.7 IO=12 mA 0.4 0.4 3.0 IO=24 mA 0.55 0.55 3.6 VI = 0 to 5.5V ±5 ±5 µA 0 VI or VO = 5.5V 10 10 µA 3.6 VI = VIH orVIL VO = 0 to 5.5V ± 10 ± 10 µA VI = VCC or GND 10 10 VI or VO = 3.6 to 5.5V VIH = VCC-0.6V ± 10 ± 10 500 500 Low Level Output Voltage Input Leakage Current Power Off Leakage Current High Impedance Output Leakage Current Quiescent Supply Current ICC incr. per Input 3.6 2.7 to 3.6 Max. Min. Max. V V V V µA µA 3/9 74LVC245A DYNAMIC SWITCHING CHARACTERISTICS Test Condition Symbol VOLP VOLV Parameter Value TA = 25 °C VCC (V) Dynamic Low Level Quiet Output (note 1) Min. Typ. Max. 0.8 CL = 50pF VIL = 0V, VIH = 3.3V 3.3 Unit V -0.8 1) Number of output defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is measured in the LOW state. AC ELECTRICAL CHARACTERISTICS Test Condition Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tOSLH tOSHL Parameter VCC (V) Propagation Delay Time 1.65 to 1.95 2.3 to 2.7 2.7 3.0 to 3.6 Output Enable Time 1.65 to 1.95 2.3 to 2.7 2.7 3.0 to 3.6 Output Disable Time 1.65 to 1.95 2.3 to 2.7 2.7 3.0 to 3.6 Output To Output 2.7 to 3.6 Skew Time (note1, 2) Value -40 to 85 °C -55 to 125 °C CL (pF) RL (Ω) ts = tr (ns) Min. Max. Min. Max. 30 30 50 50 30 30 50 50 30 30 50 50 1000 500 500 500 1000 500 500 500 1000 500 500 500 2.0 2.0 2.5 2.5 2.0 2.0 2.5 2.5 2.0 2.0 2.5 2.5 2.0 2.0 1.5 1.0 2.0 2.0 1.0 1.0 2.0 2.0 2.0 2.0 9.0 8.0 7.3 6.3 12 9.5 9.0 8.5 11 9.0 8.5 7.5 1 2.0 2.0 1.5 1.0 2.0 2.0 1.0 1.0 2.0 2.0 2.0 2.0 12 10.5 8.8 7.6 16 12.5 11 10 14 12 10 9.0 1 Unit ns ns ns ns 1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = | tPLHm - t PLHn|, tOSHL = | tPHLm - tPHLn| 2) Parameter guaranteed by design CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter CIN Input Capacitance CPD Power Dissipation Capacitance (note 1) TA = 25 °C VCC (V) 1.8 2.5 3.3 Value Min. fIN = 10MHz Typ. Unit Max. 4 pF 28 30 34 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 f IN + ICC/n (per circuit) 4/9 74LVC245A TEST CIRCUIT RT = ZOUT of pulse generator (typically 50Ω) TEST CIRCUIT AND WAVEFORM SYMBOL VALUE VCC Symbol CL 1.65 to 1.95V 2.3 to 2.7V 2.7V 3.0 to 3.6V 30pF 30pF 50pF 50pF R L = R1 1000Ω 500Ω 500Ω 500Ω VS 2 x VCC 2 x VCC 6V 6V VIH VCC VCC 2.7V 2.7V VM VCC/2 VCC/2 1.5V 1.5V VOH VCC VCC 3.0V 3.0V VX VOL + 0.15V VOL + 0.15V VOL + 0.3V VOL + 0.3V VY VOH - 0.15V VOH - 0.15V VOH - 0.3V VOH - 0.3V tr = tr <2.0ns <2.0ns <2.5ns <2.5ns 5/9 74LVC245A WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 6/9 74LVC245A SO-20 MECHANICAL DATA mm. inch DIM. MIN. TYP A a1 MAX. MIN. TYP. 2.65 0.1 0.104 0.2 a2 MAX. 0.004 0.008 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 C 0.5 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 0.300 L 0.50 1.27 0.020 0.050 M S 0.75 0.029 8° (max.) PO13L 7/9 74LVC245A 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 0.0089 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 8/9 74LVC245A 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. 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 © 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. © http://www.st.com 9/9