74LCX541 LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 5V TOLERANT INPUTS AND OUTPUTS HIGH SPEED : tPD = 8.0 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 541 LATCH-UP PERFORMANCE EXCEEDS 500mA (JESD 17) ESD PERFORMANCE: HBM > 2000V (MIL STD 883 method 3015); MM > 200V DESCRIPTION The 74LCX541 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 and high speed 3.3V applications; it can be interfaced to 5V signal environment for both inputs and outputs. PIN CONNECTION AND IEC LOGIC SYMBOLS September 2001 SOP TSSOP ORDER CODES PACKAGE TUBE T&R SOP TSSOP 74LCX541M 74LCX541MTR 74LCX541TTR 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. In order to enhance PC board layout the 74LCX541 offers a pinout having inputs and outputs on opposite sides of the package. It has same speed performance at 3.3V than 5V AC/ACT family, combined with a lower power consumption. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. 1/9 74LCX541 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION TRUTH TABLE PIN No 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 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 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 (OFF State) VO DC Output Voltage (High or Low State) (note 1) -0.5 to +7.0 V -0.5 to VCC + 0.5 - 50 V mA IIK DC Input Diode Current 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 ± 100 mA 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 74LCX541 RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage (note 1) Value Unit 2.0 to 3.6 V 0 to 5.5 V VI Input Voltage VO Output Voltage (OFF State) 0 to 5.5 V VO Output Voltage (High or Low State) 0 to VCC V ± 24 mA ± 12 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) -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 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 V V 2.2 2.7 to 3.6 IO=100 µA 0.2 0.2 2.7 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 3.0 II -40 to 85 °C VCC (V) 3.0 VOL Value 2.7 to 3.6 2.7 to 3.6 VI = VCC or GND 10 10 VI or VO= 3.6 to 5.5V ± 10 ± 10 VIH = VCC - 0.6V 500 500 V µA µA 3/9 74LCX541 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. 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 = t r (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 9.0 8.0 9.5 8.5 8.5 7.5 1.0 1.5 1.5 1.5 1.5 1.5 1.5 9.0 8.0 9.5 8.5 8.5 7.5 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 - t PLHn|, tOSHL = | tPHLm - tPHLn|) 2) Parameter guaranteed by design CAPACITIVE CHARACTERISTICS Test Condition Symbol CIN Parameter Value TA = 25 °C VCC (V) Min. Typ. Unit Max. Input Capacitance 3.3 VIN = 0 to VCC 6 pF COUT Output Capacitance 3.3 VIN = 0 to VCC 12 pF CPD Power Dissipation Capacitance (note 1) 3.3 fIN = 10MHz VIN = 0 or VCC 25 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 buffer) 4/9 74LCX541 TEST CIRCUIT TEST tPLH, tPHL SWITCH 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) WAVEFORM 1 : PROPAGATION DELAYS (f=1MHz; 50% duty cycle) 5/9 74LCX541 WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 6/9 74LCX541 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 74LCX541 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 74LCX541 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 © 2000 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom © http://www.st.com 9/9