74AC280 9 BIT PARITY GENERATOR ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 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 280 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The AC280 is an advanced high-speed CMOS 9 BIT PARITY GENERATOR 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. It is composed of nine data inputs (A to I) and B M (Plastic Package) (Micro Package) ORDER CODES : 74AC280B 74AC280M odd/even parity outputs (ΣODD and ΣEVEN). The nine data inputs control the output conditions. When the number of high level input is odd, ΣODD output is kept high and ΣEVEN output low. Conservely, when the output is even, ΣEVEN output is kept high and ΣODD low. The IC generates either odd or even parity making it flexible application. The word-length capability is easily expanded by cascading. 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 December 1998 1/8 74AC280 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 5, 6 ΣEVEN ΣODD 8, 9, 10, 11, 12, 13, 1, 2, 4 A to I NAME AND FUNCT ION Parity Outputs Data Inputs 3 NC 7 GND No Connection Ground (0V) 14 VCC Positive Supply Voltage TRUTH TABLE NUMBER OF INPUTS A THRU I THAT ARE HIGH LOGIC DIAGRAM 2/8 OUTPUT 0, 2, 4, 6, 8 ΣEVEN H ΣODD L 1, 3, 5, 7, 9 L H 74AC280 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 ± 200 mA ICC or IGND DC VCC or Ground Current 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 Valu e Unit 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) -40 to +85 8 V o C ns/V 1) VIN from 30% to70%of VCC 3/8 74AC280 DC SPECIFICATIONS Symb ol Parameter Test Co nditions VIH High Level Input Voltage 3.0 VO = 0.1 V or VCC - 0.1 V 4.5 5.5 VIL Low Level Input Voltage Valu e T A = 25 oC V CC (V) 3.0 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 4.5 5.5 VOH High Level Output Voltage 3.0 4.5 (* ) VI = V IH or V IL Min. Max. V 3.85 1.5 0.9 0.9 2.25 1.35 1.35 2.75 1.65 1.65 I O =-50 µA 2.9 2.99 2.9 IO=-50 µA 4.4 4.49 4.4 5.49 IO=-50 µA 5.4 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 µA IO=12 mA 0.001 0.1 0.1 0.36 0.44 0.36 0.44 0.36 0.44 3.0 Low Level Output Voltage Max. IO=-12 mA 5.5 VOL Un it -40 to 85 o C 4.5 (* ) VI = V IH or V IL 5.5 3.0 5.4 IO=24 mA 5.5 V 4.76 IO=24 mA 4.5 V V Input Leakage Current 5.5 VI = VCC or GND ±0.1 ±1 µA ICC Quiescent Supply Current 5.5 VI = VCC or GND 4 40 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 attime 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω. (*) All outputs loaded. 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 (Input - ΣODD, ΣEVEN) 3.3(*) (**) 5.0 Valu e o o -40 to 85 C T A = 25 C Min. T yp. Max. Min. Max. 1.5 5 17.0 1 18.5 1.5 4 13.0 1 14.5 Un it ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Co nditions V CC (V) Valu e o Un it o -40 to 85 C T A = 25 C Min. T yp. Max. Min. Max. C IN Input Capacitance 5.0 4 pF CPD Power Dissipation Capacitance (note 1) 5.0 27 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 4/8 74AC280 TEST CIRCUIT CL = 50 pF or equivalent (includes jigand probe capacitance) RL = R1 = 500Ω orequivalent RT = ZOUT of pulse generator (typically 50Ω) WAVEFORM: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) 5/8 74AC280 Plastic DIP-14 MECHANICAL DATA mm DIM. MIN. a1 0.51 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.055 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 15.24 0.600 F 7.1 0.280 I 5.1 0.201 L Z 3.3 1.27 0.130 2.54 0.050 0.100 P001A 6/8 74AC280 SO-14 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.003 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45 (typ.) D 8.55 8.75 0.336 0.344 E 5.8 6.2 0.228 0.244 e 1.27 e3 0.050 7.62 0.300 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.68 0.026 8 (max.) P013G 7/8 74AC280 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 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 . 8/8