74AC541 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4µA(MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 541 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The 74AC541 is an advanced high-speed CMOS OCTAL BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. The 3 STATE control gate operates as two inputs AND such that if either G1 and G2 are high, all eight outputs are in the high impedance state. DIP SOP TSSOP ORDER CODES PACKAGE TUBE DIP SOP TSSOP 74AC541B 74AC541M T&R 74AC541MTR 74AC541TTR In order to enhance PC board layout, the 74AC541 offers a pinout having inputs and outputs on opposite sides of the package. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS April 2001 1/9 74AC541 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION 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 TRUTH TABLE INPUTS 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 V CC Parameter Supply Voltage Value Unit -0.5 to +7 V VI DC Input Voltage -0.5 to VCC + 0.5 V VO DC Output Voltage -0.5 to VCC + 0.5 ± 20 V mA ± 20 mA IIK DC Input Diode Current IOK DC Output Diode Current IO DC Output Current ICC or IGND DC VCC or Ground Current Storage Temperature Tstg TL Lead Temperature (10 sec) ± 50 mA ± 400 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. RECOMMENDED OPERATING CONDITIONS Symbol V CC Parameter Supply Voltage Unit 2 to 6 V VI Input Voltage 0 to VCC V VO Output Voltage 0 to VCC V Top Operating Temperature dt/dv Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5V (note 1) 1) VIN from 30% to 70% of VCC 2/9 Value -55 to 125 °C 8 ns/V 74AC541 DC SPECIFICATIONS Test Condition Symbol VIH V IL VOH VOL II Ioz ICC IOLD IOHD Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage TA = 25°C VCC (V) 3.0 4.5 5.5 3.0 4.5 5.5 Value VO = 0.1 V or VCC-0.1V Min. Typ. 2.1 3.15 3.85 1.5 2.25 2.75 1.5 2.25 2.75 VO = 0.1 V or VCC-0.1V Max. -40 to 85°C -55 to 125°C Min. Min. Max. 2.1 3.15 3.85 0.9 1.35 1.65 Max. 2.1 3.15 3.85 0.9 1.35 1.65 V 0.9 1.35 1.65 3.0 IO=-50 µA 2.9 2.99 2.9 2.9 4.5 IO=-50 µA 4.4 4.49 4.4 4.4 5.49 Unit 5.5 IO=-50 µA 5.4 5.4 5.4 3.0 IO =-12 mA 2.56 2.46 2.4 4.5 IO =-24 mA 3.86 3.76 3.7 5.5 IO =-24 mA 4.86 4.76 4.7 3.0 IO=50 µA 0.002 0.1 0.1 0.1 4.5 IO=50 µA 0.001 0.1 0.1 0.1 5.5 IO=50 µA 0.001 0.1 0.1 0.1 3.0 IO =12 mA 0.36 0.44 0.5 4.5 IO =24 mA 0.36 0.44 0.5 5.5 IO =24 mA 0.36 0.44 0.5 V V V Input Leakage Current High Impedance Output Leakege Current Quiescent Supply Current 5.5 VI = VCC or GND ± 0.1 ±1 ±1 µA 5.5 VI = VIH or VIL VO = VCC or GND ± 0.3 ± 2.5 ±5 µA 5.5 VI = VCC or GND 4 40 80 µA Dynamic Output Current (note 1, 2) 5.5 VOLD = 1.65 V max 75 50 mA VOHD = 3.85 V min -75 -50 mA 1) Maximum test duration 2ms, one output loaded at time 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50Ω 3/9 74AC541 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf = 3ns) Test Condition Symbol Parameter tPLH tPHL Propagation Delay Time tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time Value TA = 25°C VCC (V) -40 to 85°C -55 to 125°C Min. Typ. Max. Min. Max. Min. Max. (*) 1.5 5.0 8.0 1.5 9.0 1.5 9.0 (**) 5.0 1.5 4.0 6.5 1.5 7.0 1.5 7.0 3.3 (*) 1.5 7.0 10.5 1.5 11.5 1.5 11.5 5.0(**) 1.5 5.0 8.0 1.5 8.5 1.5 8.5 3.3 (*) 1.5 7.0 10.5 1.5 11.5 1.5 11.5 (**) 1.5 5.0 9.0 1.5 9.5 1.5 9.5 3.3 5.0 Unit ns ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter CIN Input Capacitance C OUT Output Capacitance Power Dissipation Capacitance (note 1) C PD Value TA = 25°C VCC (V) Min. Typ. Max. -40 to 85°C -55 to 125°C Min. Min. Max. Unit Max. 5.0 5 pF 5.0 11 pF 30 pF 5.0 fIN = 10MHz 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) TEST CIRCUIT TEST SWITCH tPLH, tPHL Open tPZL, tPLZ 2V CC tPZH, tPHZ Open C L = 50pF or equivalent (includes jig and probe capacitance) R L = R1 = 500Ω or equivalent R T = ZOUT of pulse generator (typically 50Ω) 4/9 74AC541 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/9 74AC541 Plastic DIP-20 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.254 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.010 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 D 25.4 1.000 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 0.280 I 3.93 0.155 L Z 3.3 0.130 1.34 0.053 P001J 6/9 74AC541 SO-20 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 2.65 0.10 0.104 0.20 a2 MAX. 0.004 0.007 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 C 0.50 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 0.299 L 0.50 1.27 0.19 0.050 M S 0.75 0.029 8 (max.) P013L 7/9 74AC541 TSSOP20 MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. A MIN. TYP. 1.1 0.433 A1 0.05 0.10 0.15 0.002 0.004 0.006 A2 0.85 0.9 0.95 0.335 0.354 0.374 b 0.19 0.30 0.0075 0.0118 c 0.09 0.2 0.0035 0.0079 D 6.4 6.5 6.6 0.252 0.256 0.260 E 6.25 6.4 6.5 0.246 0.252 0.256 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 BSC 0.0256 BSC K 0o 4o 8o 0o 4o 8o L 0.50 0.60 0.70 0.020 0.024 0.028 A A2 A1 b K e E1 PIN 1 IDENTIFICATION 1 L E c D 8/9 MAX. 74AC541 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 infringe ment of patents or other righ ts 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 pub lication are subject to change without notice. Thi s pub lication supersedes and replaces all information previously supplied. STMicroelectronics prod ucts are not authori zed for use as critical components in life suppo rt devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2001 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 - Swit zerland - United Kingdom http://w ww.st.com 9/9