74LCX244 LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 5V TOLERANT INPUTS AND OUTPUTS HIGH SPEED: tPD = 6.5 ns (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) = 2.0V to 3.6V (1.5V Data Retention) PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 244 LATCH-UP PERFORMANCE EXCEEDS 500mA (JESD 17) ESD PERFORMANCE: HBM > 2000V (MIL STD 883 method 3015); MM > 200V DESCRIPTION The 74LCX244 is a low voltage CMOS OCTAL BUS BUFFER (NON-INVERTED) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power SOP TSSOP Table 1: Order Codes PACKAGE T&R SOP TSSOP 74LCX244MTR 74LCX244TTR and high speed 3.3V applications; it can be interfaced to 5V signal environment for both inputs and outputs. It has same speed performance at 3.3V than 5V AC/ACT family, combined with a lower power consumption. This device is designed to be used with 3 state memory address drivers, etc. 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 September 2004 Rev. 8 1/12 74LCX244 Figure 2: Input And Output Equivalent Circuit Table 2: Pin Description Table 3: Truth Table PIN N° SYMBOL 1 2, 4, 6, 8 9, 7, 5, 3 11, 13, 15, 17 18, 16, 14, 12 19 10 20 1G 1A1 to 1A4 2Y1 to 2Y4 2A1 to 2A4 Output Enable Input Data Inputs Data Outputs Data Inputs 1Y1 to 1Y4 Data Outputs 2G GND VCC NAME AND FUNCTION INPUT OUTPUT G An Yn L L H L H X L H Z X : Don’t Care Z : High Impedance Output Enable Input Ground (0V) Positive Supply Voltage Table 4: 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 (OFF State) 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 ICC DC Supply Current per Supply Pin ± 100 mA IGND DC Ground Current per Supply Pin Tstg Storage Temperature TL Lead Temperature (10 sec) ± 100 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) IO absolute maximum rating must be observed 2) VO < GND 2/12 74LCX244 Table 5: Recommended Operating Conditions Symbol VCC Parameter Supply Voltage (note 1) Value Unit 2.0 to 3.6 V VI Input Voltage 0 to 5.5 V VO Output Voltage (OFF State) 0 to 5.5 V VO Output Voltage (High or Low State) 0 to VCC V ± 24 mA IOH, IOL High or Low Level Output Current (VCC = 3.0 to 3.6V) IOH, IOL High or Low Level Output Current (VCC = 2.7V) Top dt/dv Operating Temperature Input Rise and Fall Time (note 2) ± 12 mA -55 to 125 °C 0 to 10 ns/V 1) Truth Table guaranteed: 1.5V to 3.6V 2) VIN from 0.8V to 2V at VCC = 3.0V Table 6: DC Specifications Test Condition Symbol VIH VIL VOH Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Ioff IOZ ICC ∆ICC Input Leakage Current Power Off Leakage Current High Impedance Output Leakage Current Quiescent Supply Current ICC incr. per Input Min. Max. 2.0 -55 to 125 °C Min. Unit Max. 2.0 V 2.7 to 3.6 0.8 0.8 2.7 to 3.6 IO=-100 µA VCC-0.2 VCC-0.2 2.7 IO=-12 mA 2.2 2.2 IO=-18 mA 2.4 2.4 IO=-24 mA 2.2 2.7 to 3.6 V V 2.2 IO=100 µA 0.2 0.2 IO=12 mA 0.4 0.4 IO=16 mA 0.4 0.4 IO=24 mA 0.55 0.55 2.7 to 3.6 VI = 0 to 5.5V ±5 ±5 µA 0 VI or VO = 5.5V 10 10 µA 2.7 to 3.6 VI = VIH or VIL VO = 0 to VCC ±5 ±5 µA 2.7 3.0 II -40 to 85 °C VCC (V) 3.0 VOL Value 2.7 to 3.6 VI = VCC or GND VI or VO= 3.6 to 5.5V VIH = VCC - 0.6V 2.7 to 3.6 10 10 ± 10 ± 10 500 500 V µA µA 3/12 74LCX244 Table 7: 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 outputs 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. Table 8: AC Electrical Characteristics Test Condition Symbol Parameter tPLH tPHL Propagation Delay Time tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time tOSLH tOSHL Output To Output Skew Time (note1, 2) VCC (V) 2.7 3.0 to 3.6 2.7 3.0 to 3.6 2.7 3.0 to 3.6 3.0 to 3.6 Value CL (pF) RL (Ω) ts = tr (ns) 50 500 2.5 50 500 2.5 50 500 2.5 50 500 2.5 -40 to 85 °C -55 to 125 °C Min. Max. Min. Max. 1.5 1.5 1.5 1.5 1.5 1.5 7.5 6.5 9.0 8.0 8.0 7.0 1.0 1.5 1.5 1.5 1.5 1.5 1.5 8.2 7.1 10.5 9.2 9.2 7.7 1.0 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 - tPLHn|, tOSHL = | tPHLm - tPHLn|) 2) Parameter guaranteed by design Table 9: Capacitive Characteristics Test Condition Symbol CIN COUT CPD Parameter Value TA = 25 °C VCC (V) Min. Typ. Unit Max. Input Capacitance 3.3 VIN = 0 to VCC 6 pF Output Capacitance 3.3 VIN = 0 to VCC 10 pF Power Dissipation Capacitance (note 1) 3.3 fIN = 10MHz VIN = 0 or VCC 40 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) 4/12 74LCX244 Figure 3: Test Circuit TEST SWITCH tPLH, tPHL Open tPZL, tPLZ 6V tPZH, tPHZ GND CL = 50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 500Ω or equivalent RT = ZOUT of pulse generator (typically 50Ω) Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle) 5/12 74LCX244 Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle) 6/12 74LCX244 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 74LCX244 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 74LCX244 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 74LCX244 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 74LCX244 Table 10: Revision History Date Revision 15-Sep-2004 8 Description of Changes Ordering Codes Revision - pag. 1. 11/12 74LCX244 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. 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