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74AC541
OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED)
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HIGH SPEED: tPD = 4 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 A (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) 50 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
B M (Plastic Package) (Micro Package) ORDER CODES : 74AC541B 74AC541M
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
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
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74AC541
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 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 NAME AND FUNCT ION Output Enable Input Data Inputs Data Outputs
GND VCC
Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUT G1 H X L L
X:"H" or "L" Z: High impedance
O UT PUT An X X H L Yn Z Z H L
G2 X H L L
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IIK IOK IO ICC orIGND Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current DC VCC or Ground Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 50 400 -65 to +150 300 Unit V V V mA mA mA mA
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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 VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature: Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1) Parameter Valu e 2 to 6 0 to VCC 0 to VCC -40 to +85 8 Unit V V V
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C
ns/V
1) VIN from 30% to70%of VCC
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DC SPECIFICATIONS
Symb ol Parameter V CC (V) VIH High Level Input Voltage 3.0 4.5 5.5 VIL Low Level Input Voltage 3.0 4.5 5.5 VOH High Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 VOL Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 II IOZ ICC IOLD IOHD Input Leakage Current 3 State Output Leakage Current Quiescent Supply Current Dynamic Output Current (note 1, 2) 5.5 5.5 5.5 5.5 VI(*) = VIH or VIL VI(*) = VIH or VIL IO=-50 A IO=-50 A IO=-50 A IO=-12 mA IO=-24 mA IO=-24 mA IO=50 A IO=50 A IO=50 IO=12 mA IO=24 mA IO=24 mA VI = VCC orGND VI = VIH orVIL VO = VCC orGND VI = VCC orGND VOLD = 1.65 V max VOHD = 3.85 V min 2.9 4.4 5.4 2.56 3.86 4.86 0.002 0.001 0.001 0.1 0.1 0.1 0.36 0.36 0.36 0.1 0.5 8 VO = 0.1 V or VCC - 0.1 V VO = 0.1 V or VCC - 0.1 V Test Co nditions Min. 2.1 3.15 3.85 T yp. 1.5 2.25 2.75 1.5 2.25 2.75 2.99 4.49 5.49 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 1 5 80 75 -75 A A A mA mA V V Valu e T A = 25 oC Max. -40 to 85 o C Min. 2.1 3.15 3.85 0.9 1.35 1.65 V V Max. Un it
1) Maximum test duration 2ms, one output loaded attime 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 . (*) All outputs loaded.
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AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = tf =3 ns)
Symb ol Parameter V CC (V) tPLH tPHL tPZL tPZH tPLZ tPHZ Propagation Delay Time Output Enable Time Output Disable Time 3.3(*) 5.0(**) 3.3(*) 5.0(**) 3.3(*) 5.0(**) T est Con ditio n 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 V CC (V) CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1) 5.0 5.0 5.0 Test Con dition s
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Value T A = 25 C Min. T yp. 4 8 21 Max. -40 to 85 C Min. Max.
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Unit
pF pF 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 tPLH , tPHL tPZL , tPLZ tPZH , tPHZ
CL = 50 pF or equivalent (includes jigand probe capacitance) RL = R1 = 500 orequivalent RT = ZOUT of pulse generator (typically 50)
SW IT CH Open 2VCC Open
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WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
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Plastic DIP-20 (0.25) MECHANICAL DATA
mm MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.34 8.5 2.54 22.86 7.1 3.93 0.130 0.053 0.254 1.39 0.45 0.25 25.4 0.335 0.100 0.900 0.280 0.155 1.65 TYP. MAX. MIN. 0.010 0.055 0.018 0.010 1.000 0.065 inch TYP. MAX.
DIM.
P001J
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SO-20 MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F L M S 7.40 0.50 12.60 10.00 1.27 11.43 7.60 1.27 0.75 8 (max.) 0.291 0.19 13.00 10.65 0.35 0.23 0.50 45 (typ.) 0.496 0.393 0.050 0.450 0.299 0.050 0.029 0.512 0.419 0.10 mm TYP. MAX. 2.65 0.20 2.45 0.49 0.32 0.013 0.009 0.020 0.004 MIN. inch TYP. MAX. 0.104 0.007 0.096 0.019 0.012
P013L
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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. The ST logo is a registered trademark of STMicroelectronics (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com .
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