74LCX541 Low voltage CMOS octal bus buffer (3-state) with 5V tolerant inputs and outputs Features ■ 5V tolerant inputs and outputs ■ High speed: – tPD = 8.0ns (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 24mA ■ Balanced propagation delays: – tPLH ≅ tPHL ■ Operating voltage range: – VCC (Opr) = 2.0V to 3.6V ■ 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 SO-20 TSSOP20 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. 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. Order codes Part number Package Packaging 74LCX541MTR SO-20 Tape and reel 74LCX541TTR TSSOP20 Tape and reel January 2007 Rev 5 1/17 www.st.com 17 Contents 74LCX541 Contents 1 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 4 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 74LCX541 1 Logic symbols and I/O equivalent circuit Logic symbols and I/O equivalent circuit Figure 1. IEC logic symbols Figure 2. Input and output equivalent circuit 3/17 Pin settings 74LCX541 2 Pin settings 2.1 Pin connection Figure 3. 2.2 Pin connection (top through view) Pin description Table 1. Pin description 4/17 Pin N° Symbol Name and function 1, 19 G1, G2 2, 3, 4, 5, 6, 7, 8, 9 A1 to A8 Data inputs 18, 17, 16, 15, 14, 13, 12, 11 Y1 to Y8 Data outputs 10 GND Ground (0V) 20 VCC Positive supply voltage Output enable inputs 74LCX541 Logic states 3 Logic states 3.1 Truth table Table 2. Truth table Input Note: Output G1 G2 An Yn H X X Z X H X Z L L H L L L L H X : Do not care Z : High impedance 5/17 Maximum rating 4 74LCX541 Maximum rating Stressing the device above the rating listed in the “absolute maximum ratings” table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. refer also to the STMicroelectronics sure program and other relevant quality documents. Table 3. 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) -0.5 to +7.0 V VO DC output voltage (high or low state) (1) -0.5 to VCC + 0.5 V IIK DC input diode current -50 mA IOK DC output diode current (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 -65 to +150 °C 300 °C Value Unit 2.0 to 3.6 V VCC TL Parameter Lead temperature (10 sec) 1. IO absolute maximum rating must be observed 2. VO < GND 4.1 Recommended operating conditions Table 4. Recommended operating conditions Symsbol VCC Parameter Supply voltage (1) 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 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 = 2.7V) ± 12 mA -40 to 85 °C 0 to 10 ns/V Top dt/dv Operating temperature Input rise and fall time (2) 1. Truth table guaranteed: 1.5V to 3.6V 2. VIN from 0.8V to 2V at VCC = 3.0V 6/17 74LCX541 5 Electrical characteristics Electrical characteristics Table 5. DC specifications Test condition Symbol Parameter VIH High level input voltage VIL Low level input voltage VOH -40 to 85°C VCC (V) Min Unit Max 2.0 V 2.7 to 3.6 0.8 2.7 to 3.6 IO = -100µA VCC-0.2 2.7 IO = -12mA 2.2 IO = -18mA 2.4 IO = -24mA 2.2 High level output voltage 3.0 VOL Value V 2.7 to 3.6 IO = 100µA 0.2 2.7 IO = 12mA 0.4 IO = 16mA 0.4 IO = 24mA 0.55 Low level output voltage 3.0 V V II Input leakage current 2.7 to 3.6 VI = 0 to 5.5V ±5 µA Ioff Power OFF leakage current 0 VI or VO = 5.5V 10 µA IOZ High impedance output leakage current 2.7 to 3.6 VI = VIH or VIL VO = 0 to VCC ±5 µA Quiescent supply current 2.7 to 3.6 VI = VCC or GND 10 ICC VI or VO = 3.6 to 5.5V ± 10 VIH = VCC - 0.6V 500 ∆ICC I incr. per Input 2.7 to 3.6 µA µA Table 6. Dynamic switching characteristics Test condition Symbol VOLP VOLV Parameter Dynamic low level quiet output (1) TA = 25 °C VCC (V) 3.3 Value Min CL = 50pF VIL = 0V, VIH = 3.3V Typ Unit Max 0.8 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. 7/17 Electrical characteristics 74LCX541 Table 7. 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 (1) (2) Value -40 to 85 °C VCC (V) CL (pF) RL (Ω) ts = tr (ns) Min Max 2.7 50 500 2.5 1.5 9.0 1.5 8.0 1.5 9.5 1.5 8.5 1.5 8.5 1.5 7.5 3.0 to 3.6 2.7 50 500 2.5 3.0 to 3.6 2.7 50 500 2.5 3.0 to 3.6 3.0 to 3.6 50 500 2.5 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 - tPLHn|, tOSHL = | tPHLm - tPHLn|) 2. Parameter guaranteed by design Table 8. Capacitive characteristics Test condition Symbol 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 (1) 3.3 fIN = 10MHz VIN = 0 or VCC 25 pF CIN 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) 8/17 74LCX541 6 Test circuit Test circuit Figure 4. Test circuit Figure 5. Test circuit Test Switch tPLH, tPHL Open tPZL, tPLZ 6V tPZH, tPHZ GND CL = 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 500Ω or equivalent RT = ZOUT of pulse generator (typically 50Ω) 9/17 Waveforms 7 10/17 74LCX541 Waveforms Figure 6. Propagation delays (f = 1MHz; 50% duty cycle) Figure 7. Output enable and disable time (f = 1MHz; 50% duty cycle) 74LCX541 8 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 11/17 Package mechanical data 74LCX541 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 12/17 74LCX541 Package mechanical data 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 13/17 Package mechanical data 74LCX541 Tape & Reel SO-20 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 14/17 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 74LCX541 Package mechanical data Tape & Reel TSSOP20 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 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 15/17 Revision history 9 74LCX541 Revision history Table 9. Revision history 16/17 Date Revision Changes 15-Sep-2004 4 Ordering Codes Revision - pag. 1. 24-Jan-2007 5 The document has been reformatted, temperature ranges updated 74LCX541 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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