74AC16244 16-BIT 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°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS 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 16244 IMPROVED LATCH-UP IMMUNITY TSSOP ORDER CODES PACKAGE TSSOP TUBE T &R 74AC16244TTR PIN CONNECTION DESCRIPTION The 74AC16244 is an advanced high-speed CMOS 16-BIT BUS BUFFER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. Any nG output control governs four BUS BUFFERS. Output Enable inputs (nG) tied together give full 16 bit operation. When nG is LOW, the outputs are enabled. When nG is HIGH, the output are in high impedance state. The device is designed to be used with 3-state memory address drivers, etc. March 2002 1/8 74AC16244 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION IEC LOGIC SYMBOLS PIN No SYMBOL 1 2, 3, 5, 6 8, 9, 11, 12 13, 14, 16, 17 19, 20, 22, 23 24 25 30, 29, 27, 26 36, 35, 33, 32 41, 40, 38, 37 47, 46, 44, 43 1G 1Y1 to 1Y4 2Y1 to 2Y4 3Y1 to 3Y4 4Y1 to 4Y4 4G 3G 4A1 to 4A4 3A1 to 3A4 2A1 to 2A4 1A1 to 1A4 Output Enable Input Data Outputs Data Outputs Data Outputs Data Outputs Output Enable Input Output Enable Input Data Outputs Data Outputs Data Outputs Data Outputs 48 4, 10, 15, 21, 28, 34, 39, 45 2G Output Enable Input 7, 18, 31, 42 NAME AND FUNCTION GND Ground (0V) VCC Positive Supply Voltage TRUTH TABLE INPUTS G An Yn L L H L H X L H Z X : Don’t Care Z : High Impedance 2/8 OUTPUT 74AC16244 ABSOLUTE MAXIMUM RATINGS Symbol V CC Parameter Supply Voltage VI DC Input Voltage VO DC Output Voltage IIK DC Input Diode Current IOK DC Output Diode Current IO DC Output Current ICC or IGND DC VCC or Ground Current Storage Temperature Tstg TL Lead Temperature (10 sec) Value Unit -0.5 to +7.0 V -0.5 to +7.0 V -0.5 to VCC + 0.5 ± 20 V mA ± 50 mA ± 50 mA ± 400 mA -65 to +150 °C 300 °C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied RECOMMENDED OPERATING CONDITIONS Symbol V CC Parameter Supply Voltage Value Unit 2 to 6 V VI Input Voltage 0 to VCC V VO Output Voltage 0 to VCC V Top Operating Temperature dt/dv Input Rise and Fall Time (note 1) V CC = 3.0, 4.5 or 5.5 -55 to 125 0 to 8 °C ns/V 1) VIN from 30% to 70% of VCC 3/8 74AC16244 DC SPECIFICATIONS Test Condition Symbol VIH V IL VOH VOL II I OZ ICC Parameter High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Input Leakage Current High Impedance Output Leakage Current Quiescent Supply Current Value TA = 25 °C VCC (V) 3.0 4.5 5.5 3.0 VO = 0.1 V or VCC-0.1V -55 to 125°C Min. Min. Min. Typ. 2.1 3.15 3.85 1.5 2.25 2.75 1.5 0.9 0.9 0.9 2.25 2.75 1.35 1.65 1.35 1.65 1.35 1.65 VO = 0.1 V or VCC-0.1V 4.5 5.5 Max. -40 to 85°C Max. 2.1 3.15 3.85 Max. 2.1 3.15 3.85 3.0 IO=-50 µA 2.9 2.99 2.9 2.9 4.5 IO=-50 µA 4.4 4.49 4.4 4.4 5.49 Unit V V 5.5 IO=-50 µA 5.4 5.4 5.4 3.0 IO =-12 mA 2.56 2.46 2.46 4.5 IO =-24 mA 3.86 3.76 3.76 5.5 IO =-24 mA 4.86 4.76 4.76 3.0 IO=50 µA 0.002 0.1 0.1 0.1 4.5 IO=50 µA 0.001 0.1 0.1 0.1 5.5 IO=50 µA 0.001 0.1 0.1 0.1 3.0 IO =12 mA 0.36 0.44 0.44 4.5 IO =24 mA 0.36 0.44 0.44 5.5 VI = VCC or GND ± 0.1 ±1 ±1 µA 5.5 VI = VIH or VIL VO = VCC or GND ± 0.5 ±5 ±5 µA 5.5 VI = VCC or GND 8 80 80 µA V V AC ELECTRICAL CHARACTERISTICS ( CL = 50 pF, RL = 500 Ω, Input tr = tf = 3n) Test Condition Symbol Parameter VCC (V) (*) CL (pF) Value TA = 25°C Min. Typ. Max. -40 to 85°C -55 to 125°C Min. Min. Max. Max. tPLH tPHL Propagation Delay Time A to Y tPZL tPZH Output Enable Time 6 8.5 11.5 11.5 5.0(**) 4.5 7.0 9.0 9.0 3.3 (*) 8 10.5 14.0 14.0 (**) 5.0 5.5 8.0 10.0 10.0 tPLZ tPHZ Output Disable Time 3.3 (*) 7.3 9.0 11.5 11.5 (**) 5.5 8.0 14.0 14.0 (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V 4/8 3.3 5.0 Unit ns ns ns 74AC16244 CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter CIN Input Capacitance C OUT Output Capacitance Power Dissipation Capacitance (note 1) C PD TA = 25°C VCC (V) 5.0 Value Min. fIN = 10MHz Typ. Max. 7 10 -40 to 85°C -55 to 125°C Min. Min. Max. Unit Max. 10 10 pF 14 pF 25 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 x VCC x fIN + ICC/ 16(per Latch) TEST CIRCUIT TEST SWITCH tPLH, tPHL Open tPZL, tPLZ VCC tPZH, tPHZ GND C L = 50 pF or equivalent (includes jig and probe capacitance) R L = R1 = 500Ω or equivalent R T = ZOUT of pulse generator (typically 50Ω) 5/8 74AC16244 WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle) WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 6/8 74AC16244 TSSOP48 MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. A MIN. TYP. 1.1 A1 0.05 0.043 0.15 A2 MAX. 0.002 0.006 0.9 0.035 b 0.17 0.27 0.0067 0.011 c 0.09 0.20 0.0035 0.0079 D 12.4 12.6 0.408 0.496 E 7.95 8.25 0.313 0.325 E1 6.0 6.2 0.236 0.244 e 0.5 BSC 0.0197 BSC K 0° 8° 0° 8° L 0.50 0.75 0.020 0.030 A A2 A1 b K e L E c D E1 PIN 1 IDENTIFICATION 1 7065588A 7/8 74AC16244 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. Specifications 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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