74LCX541MTR

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 74LCX541MTR 74LCX541TTR Package SO-20 TSSOP20 Packaging Tape and reel Tape and reel January 2007 Rev 5 1/17 www.st.com 17 Contents 74LCX541 Contents 1 2 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 2.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 6 7 8 9 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 74LCX541 Logic symbols and I/O equivalent circuit 1 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 2.1 Pin settings Pin connection Figure 3. Pin connection (top through view) 2.2 Pin description Table 1. Pin description Pin N° 1, 19 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 10 20 Symbol G1, G2 A1 to A8 Y1 to Y8 GND VCC Name and function Output enable inputs Data inputs Data outputs Ground (0V) Positive supply voltage 4/17 74LCX541 Logic states 3 3.1 Logic states Truth table Table 2. Truth table Input G1 H X L L G2 X H L L An X X H L Output Yn Z Z L H Note: X : Do not care Z : High impedance 5/17 Maximum rating 74LCX541 4 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 VCC VI VO VO IIK IOK IO ICC IGND Tstg TL Supply voltage DC input voltage DC output voltage (OFF state) DC output voltage (high or low state) (1) DC input diode current DC output diode current (2) DC output current DC supply current per supply pin DC ground current per supply pin Storage temperature Lead temperature (10 sec) Parameter Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 -50 -50 ±50 ± 100 ± 100 -65 to +150 300 Unit V V V V mA mA mA mA mA °C °C 1. IO absolute maximum rating must be observed 2. VO < GND 4.1 Recommended operating conditions Table 4. Recommended operating conditions Symsbol VCC VI VO VO IOH, IOL IOH, IOL Top dt/dv Supply voltage (1) Input voltage Output voltage (OFF state) Output voltage (high or low state) High or low level output current (VCC = 3.0 to 3.6V) High or low level output current (VCC = 2.7V) Operating temperature Input rise and fall time (2) Parameter Value 2.0 to 3.6 0 to 5.5 0 to 5.5 0 to VCC ± 24 ± 12 -40 to 85 0 to 10 Unit V V V V mA mA °C ns/V 1. Truth table guaranteed: 1.5V to 3.6V 2. VIN from 0.8V to 2V at VCC = 3.0V 6/17 74LCX541 Electrical characteristics 5 Electrical characteristics Table 5. DC specifications Test condition Symbol Parameter VCC (V) 2.7 to 3.6 Low level input voltage 2.7 to 3.6 2.7 VOH High level output voltage 3.0 2.7 to 3.6 2.7 VOL Low level output voltage 3.0 II Ioff IOZ Input leakage current Power OFF leakage current High impedance output leakage current Quiescent supply current I incr. per Input 2.7 to 3.6 0 2.7 to 3.6 IO = -100µA IO = -12mA IO = -18mA IO = -24mA IO = 100µA IO = 12mA IO = 16mA IO = 24mA VI = 0 to 5.5V VI or VO = 5.5V VI = VIH or VIL VO = 0 to VCC VI = VCC or GND VI or VO = 3.6 to 5.5V 2.7 to 3.6 VIH = VCC - 0.6V VCC-0.2 2.2 V 2.4 2.2 0.2 0.4 V 0.4 0.55 ±5 10 ±5 10 ± 10 500 µA µA µA 0.8 V Value -40 to 85°C Min 2.0 Max V Unit VIH VIL High level input voltage ICC ∆ICC 2.7 to 3.6 µA µA Table 6. Dynamic switching characteristics Test condition Symbol Parameter VCC (V) 3.3 CL = 50pF VIL = 0V, VIH = 3.3V Value TA = 25 °C Min Typ 0.8 V -0.8 Max Unit VOLP VOLV Dynamic low level quiet output (1) 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 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 50 500 2.5 50 500 2.5 50 500 2.5 CL (pF) 50 RL (Ω) 500 ts = tr (ns) 2.5 Value -40 to 85 °C Min 1.5 1.5 1.5 1.5 1.5 1.5 Max 9.0 8.0 9.5 8.5 8.5 7.5 1.0 ns ns ns ns Unit tPLH tPHL Propagation delay time tPZL tPZH Output enable time tPLZ tPHZ Output disable time tOSLH tOSHL output to output skew time (1) (2) 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 CIN COUT CPD Parameter VCC (V) 3.3 3.3 3.3 VIN = 0 to VCC VIN = 0 to VCC fIN = 10MHz VIN = 0 or VCC Value TA = 25 °C Min Typ 6 12 25 Max pF pF pF Unit Input capacitance Output capacitance Power dissipation capacitance (1) 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 Test circuit 6 Test circuit Figure 4. Test circuit Figure 5. Test circuit Test tPLH, tPHL tPZL, tPLZ tPZH, tPHZ Switch Open 6V 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 74LCX541 7 Waveforms Figure 6. Propagation delays (f = 1MHz; 50% duty cycle) Figure 7. Output enable and disable time (f = 1MHz; 50% duty cycle) 10/17 74LCX541 Package mechanical data 8 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. A A1 B C D E e H h L k ddd 10.00 0.25 0.4 0° mm. MIN. 2.35 0.1 0.33 0.23 12.60 7.4 1.27 10.65 0.75 1.27 8° 0.100 0.394 0.010 0.016 0° TYP MAX. 2.65 0.30 0.51 0.32 13.00 7.6 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 0.050 0.419 0.030 0.050 8° 0.004 inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0016022D 12/17 74LCX541 Package mechanical data TSSOP20 MECHANICAL DATA mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0˚ 0.45 0.60 0.05 0.8 0.19 0.09 6.4 6.2 4.3 6.5 6.4 4.4 0.65 BSC 8˚ 0.75 0˚ 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 6.6 6.6 4.48 0.002 0.031 0.007 0.004 0.252 0.244 0.169 0.256 0.252 0.173 0.0256 BSC 8˚ 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.260 0.260 0.176 inch A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 0087225C 13/17 Package mechanical data 74LCX541 Tape & Reel SO-20 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 10.8 13.2 3.1 3.9 11.9 12.8 20.2 60 30.4 11 13.4 3.3 4.1 12.1 0.425 0.520 0.122 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 1.197 0.433 0.528 0.130 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch 14/17 74LCX541 Package mechanical data Tape & Reel TSSOP20 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.8 6.9 1.7 3.9 11.9 12.8 20.2 60 22.4 7 7.1 1.9 4.1 12.1 0.268 0.272 0.067 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.276 0.280 0.075 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch 15/17 Revision history 74LCX541 9 Revision history Table 9. Revision history Date 15-Sep-2004 24-Jan-2007 Revision 4 5 Changes Ordering Codes Revision - pag. 1. The document has been reformatted, temperature ranges updated 16/17 74LCX541 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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