74AC240 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (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 240 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The AC240 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 B M (Plastic Package) (Micro Package) ORDER CODES : 74AC240B 74AC240M mantaining high speed operation similar to equivalent Bipolar Schottky TTL. G control output governs four BUS BUFFERs. This device is designed to be used with 3 state memory address drivers, etc. 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 1997 1/8 74AC240 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1 1G NAME AND F UNCTIO N 2, 4, 6, 8 1A1 to 1A4 Data Inputs 9, 7, 5, 3 2Y1 to 2Y4 Data Outputs 11, 13, 15, 17 2A1 to 2A4 Data Inputs 18, 16, 14, 12 1Y1 to 1Y4 Data Outputs Output Enable Input 19 2G 10 GND Output Enabel Input Ground (0V) 20 VCC Positive Supply Voltage TRUTH TABLE INPUT G OUT PUT An Yn L L H L H L H X Z X: ”H” or ”L” Z: High impedance ABSOLUTE MAXIMUM RATINGS Symbol VCC 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 V IIK DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 50 mA DC VCC or Ground Current ± 400 mA ICC or IGND Tstg Storage Temperature TL 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 Un it 2 to 6 V V VI Input Voltage 0 to VCC VO Output Voltage 0 to VCC Top dt/dv Operating Temperature: Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1) 1) VIN from 30% to 70% of VCC 2/8 Value -40 to +85 8 V o C ns/V 74AC240 DC SPECIFICATIONS Symbol Parameter Test Con dition s 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 Value T A = 25 oC V CC (V) Min. Typ. 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 3.0 4.5 VI(*) = 5.5 VIH or VIL 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 5.4 IO=-12 mA 2.56 2.46 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 4.5 IO=24 mA 0.36 0.44 5.5 IO=24 mA 0.36 0.44 4.5 5.5 3.0 VI(*) = VIH or VIL V V 4.5 3.0 VOL Unit -40 to 85 o C 4.76 V Input Leakage Current 5.5 VI = VCC or GND ±0.1 ±1 µA IOZ 3 State Output Leakage Current 5.5 VI = VIH or VIL VO = VCC or GND ±0.5 ±5 µA ICC Quiescent Supply Current 5.5 VI = VCC or GND 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 II IOHD 1) Maximum test duration 2ms, one output loaded at time 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω. (*) All outputs loaded. 3/8 74AC240 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = t f =3 ns) Symbol Parameter T est Cond ition V CC (V) tPLH tPHL Propagation Delay Time tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time (*) Value T A = 25 oC -40 to 85 o C Min. Typ. Max. Min . Max. 3.3 5.0(**) 3.3(*) 1.5 1.5 1.5 5 4 7 8 6.5 10.5 1.5 1.5 1.5 9 7 11.5 (**) 1.5 1.5 1.5 5 7 6 8 10.5 9 1.5 1.5 1.5 8.5 11.5 9.5 5.0 3.3(*) 5.0(**) Unit ns ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Cond ition s V CC (V) Input Capacitance 5.0 COUT Output Capacitance CPD Power Dissipation Capacitance (note 1) CIN Value o T A = 25 C Min . Typ. Max. Un it o -40 to 85 C Min. Max. 4 pF 5.0 8 pF 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/n (per circuit) TEST CIRCUIT TEST SWITCH t PLH, tPHL Open t PZL, tPLZ 2VCC t PZH, tPHZ Open CL = 50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 500Ω or equivalent RT =ZOUT of pulse generator (typically 50Ω) 4/8 74AC240 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/8 74AC240 Plastic DIP20 (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 74AC240 SO20 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 74AC240 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A . 8/8