74ACT244 OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN), VIL = 0.8V (MAX) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 244 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The ACT244 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. M (Micro Package) B (Plastic Package) ORDER CODES : 74ACT244B 74ACT244M 74ACT244T T (TSSOP Package) G control output governs four BUS BUFFERs. This device is desibned to be used with 3 state memory address drivers, etc. The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels. 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 February 1999 1/9 74ACT244 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1 1G NAME AND FUNCT ION 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 Ground (0V) Output Enabel Input 20 VCC Positive Supply Voltage TRUTH TABLE INPUT G OUTPUT An Yn L L L L H H 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 orIGND 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 Unit V V VI Input Voltage 0 to VCC VO Output Voltage 0 to VCC Top Operating Temperature: dt/dv Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1) 1) VIN from 0.8 V to 2.0 V 2/9 Value 4.5 to 5.5 -40 to +85 8 V o C ns/V 74ACT244 DC SPECIFICATIONS Symb ol Parameter Test Co nditions VIH High Level Input Voltage 4.5 5.5 VIL Low Level Input Voltage 4.5 5.5 VOH High Level Output Voltage 4.5 5.5 Low Level Output Voltage VO = 0.1 V or VCC - 0.1 V Min. T yp. 2.0 1.5 2.0 2.0 1.5 2.0 VO = 0.1 V or VCC - 0.1 V VI(*) = VIH or VIL Un it -40 to 85 o C Max. Min. Max. V 1.5 0.8 0.8 1.5 0.8 0.8 IO=-50 µA 4.4 4.49 4.4 IO=-50 µA 5.4 5.49 5.4 IO=-24 mA 3.86 IO=-24 mA 4.86 4.5 IO=50 µA 0.001 0.1 0.1 IO=50 mA 0.001 0.1 0.1 IO=24 mA 0.36 0.44 IO=24 mA 0.36 0.44 5.5 4.5 5.5 (*) VI = VIH or VIL V V 5.5 4.5 VOL Valu e T A = 25 oC V CC (V) 3.76 4.76 V 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 ICCT Max ICC /Input 5.5 VI = VCC -2.1V 1.5 mA ICC Quiescent Supply Current 5.5 VI = VCC orGND 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 0.6 8 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. 3/9 74ACT244 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) (*) Valu e T A = 25 oC -40 to 85 o C Un it Min. 1.5 T yp. 4.5 Max. 9.0 Min. 1.5 Max. 10.0 ns tPLH tPHL Propagation Delay Time 5.0 tPZL tPZH tPLZ tPHZ Output Enable Time 5.0(*) 1.5 5.5 9.0 1.5 10.0 ns Output Disable Time 5.0(*) 1.5 6.5 10.0 1.5 11.0 ns (*) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Co nditions V CC (V) Valu e Un it o o -40 to 85 C T A = 25 C Min. T yp. Max. Min. Max. CIN Input Capacitance 5.0 4 pF Ci/o I/O Capacitance 5.0 8 pF CPD Power Dissipation Capacitance (note 1) 5.0 24 pF 1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/n (per circuit) TEST CIRCUIT T EST tPLH , tPHL SW IT CH 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) 4/9 74ACT244 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 5/9 74ACT244 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 74ACT244 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 74ACT244 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. 74ACT244 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 trademark of STMicroelectronics 1999 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 . 9/9