74AC541 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (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 AC541 is an advanced CMOS OCTAL BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power applications mantaining high speed operation similar to B M (Plastic Package) (Micro Package) ORDER CODES : 74AC541B 74AC541M equivalent Bipolar Schottky TTL. The 3 STATE control gate operates as a 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 AC541 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 November 1998 1/8 74AC541 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1,19 G1, G2 Output Enable Input NAME AND FUNCT ION 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 TRUTH TABLE INPUT O UT PUT G1 G2 An Yn H X X Z X H X Z L L H H L L L L X:”H” or ”L” Z: High impedance ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage Value Unit -0.5 to +7 V V VI DC Input Voltage -0.5 to VCC + 0.5 VO DC Output Voltage -0.5 to VCC + 0.5 V IIK DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 50 mA ± 400 mA ICC orIGND Tstg TL DC VCC or Ground Current Storage Temperature Lead Temperature (10 sec) -65 to +150 o 300 o C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage VI Input Voltage VO Output Voltage Top Operating Temperature: dt/dv Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1) 1) VIN from 30% to70%of VCC 2/8 Valu e Unit 2 to 6 V 0 to VCC V 0 to VCC -40 to +85 8 V o C ns/V 74AC541 DC SPECIFICATIONS Symb ol Parameter Test Co nditions VIH High Level Input Voltage 3.0 4.5 VO = 0.1 V or VCC - 0.1 V 5.5 VIL Low Level Input Voltage 3.0 4.5 Valu e T A = 25 oC V CC (V) Min. T yp. 2.1 1.5 2.1 3.15 2.25 3.15 3.85 2.75 VO = 0.1 V or VCC - 0.1 V 5.5 VOH High Level Output Voltage Low Level Output Voltage Max. Min. Max. V 3.85 1.5 0.9 0.9 2.25 1.35 1.35 2.75 1.65 1.65 IO=-50 µA 2.9 2.99 2.9 IO=-50 µA 4.4 4.49 4.4 IO=-50 µA 5.4 5.49 IO=-12 mA 2.56 2.46 4.5 IO=-24 mA 3.86 3.76 5.5 IO=-24 mA 4.86 3.0 IO=50 µA 0.002 0.1 0.1 IO=50 µA 0.001 0.1 0.1 IO=50 µΑ 0.001 0.1 0.1 IO=12 mA 0.36 0.44 IO=24 mA 0.36 0.44 3.0 4.5 VI(*) = 5.5 VIH or VIL 3.0 VOL Un it -40 to 85 o C 4.5 VI(*) = 5.5 VIH or VIL 3.0 4.5 V 4.76 V 0.36 0.44 Input Leakage Current 5.5 VI = VCC orGND ±0.1 ±1 µA IOZ 3 State Output Leakage Current 5.5 VI = VIH orVIL VO = VCC orGND ±0.5 ±5 µA ICC Quiescent Supply Current 5.5 VI = VCC orGND 8 80 µA IOLD Dynamic Output Current (note 1, 2) 5.5 VOLD = 1.65 V max 75 mA VOHD = 3.85 V min -75 mA 5.5 II IOHD IO=24 mA 5.4 V 1) Maximum test duration 2ms, one output loaded attime 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω. (*) All outputs loaded. 3/8 74AC541 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns) Symb ol Parameter T est Con ditio n V CC (V) tPLH tPHL Propagation Delay Time tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time 3.3(*) 5.0(**) 3.3(*) 5.0(**) 3.3(*) 5.0(**) Valu e T A = 25 oC -40 to 85 o C Min. T yp. Max. Min. Max. 1.5 5 8 1.5 9 1.5 1.5 1.5 1.5 1.5 4 7 5 7 6 6.5 10.5 8 10.5 9 1.5 1.5 1.5 1.5 1.5 7 11.5 8.5 11.5 9.5 Un it ns ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symbo l Parameter Test Con dition s V CC (V) CIN Input Capacitance 5.0 Value o T A = 25 C Min. T yp. Max. Unit o -40 to 85 C Min. Max. 4 pF COUT Output Capacitance 5.0 8 pF CPD Power Dissipation Capacitance (note 1) 5.0 21 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 • VCC • fIN + ICC/8 (per circuit) TEST CIRCUIT T EST SW IT CH tPLH , tPHL Open tPZL , tPLZ 2VCC tPZH , tPHZ Open CL = 50 pF or equivalent (includes jigand probe capacitance) RL = R1 = 500Ω orequivalent RT = ZOUT of pulse generator (typically 50Ω) 4/8 74AC541 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/8 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 6/8 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 7/8 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 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. Specification 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. 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