UNISONIC TECHNOLOGIES CO., LTD U74AC244 CMOS IC OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS DESCRIPTION The U74AC244 is a octal buffers/drivers with 3-state outputs. It is organized as two 4-bit buffers/drivers with separate output-enable ( OE ) inputs. When OE is high, the Y outputs are in a high-impedance state, and the outputs neither load nor drive the bus lines. When OE is low, the device passes noninverted data from the A inputs to the Y outputs. The U74AC244 is designed to improve the performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers and transmitters. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. TSSOP-20 FEATURES * Wide supply voltage range from 2V to 6V * Max tpd of 7 ns from A to Y at 5V * Low power consumption, ICC = 4 μA (Max.) at 5.5V * ±24 mA output driver at 5.5V ORDERING INFORMATION Ordering Number Lead Free Halogen Free U74AC244L-P20-R U74AC244G- P20-R U74AC244L- P20-T U74AC244G- P20-T www.unisonic.com.tw Copyright © 2012 Unisonic Technologies Co., Ltd Package Packing TSSOP-20 TSSOP-20 Tape Reel Tube 1 of 6 QW-R502-784.A U74AC244 CMOS IC PIN CONFIGURATION FUNCTION TABLE (each buffer) INPUTS OE A OUTPUT Y L L H H L X H L Z LOGIC SYMBOL (positive logic) 1OE 1A1 1A2 1A3 1A4 1 2OE 2 18 4 16 6 14 8 12 1Y1 2A1 1Y2 2A2 1Y3 2A3 1Y4 2A4 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 19 11 9 13 7 15 5 17 3 2Y1 2Y2 2Y3 2Y4 2 of 6 QW-R502-784.A U74AC244 CMOS IC ABSOLUTE MAXIMUM RATING (TA =25°C , unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Supply Voltage VCC -0.5~7 V Input Voltage VIN -0.5~VCC +0.5 V Output Voltage VOUT -0.5~VCC +0.5 V Input Clamp Current (VIN<0, or VIN>VCC) IIK ±20 mA Output Clamp Current (VOUT<0, or VOUT>VCC) IOK ±20 mA Output Current IOUT ±50 mA VCC or GND Current ICC ±200 mA Storage Temperature TSTG -65 ~ +150 °C Notes: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER Junction to Ambient SYMBOL θJA RATING 85 UNIT °C/W RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage SYMBOL VCC High-Level Input Voltage VIH Low-Level Input Voltage VIL Input Voltage Output Voltage VCC = 3V VCC = 4.5V VCC = 5.5V VCC = 3V VCC = 4.5V VCC = 5.5V VIN VOUT High-level Output Current IOH Low-level Output Current IOL Input Transition Rise or Fall Rate Operating Temperature TEST CONDITIONS 0 0 VCC=3V VCC=4.5V VCC=5.5V VCC=3V VCC=4.5V VCC=5.5V Δt/Δv TA UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2 2.1 3.15 3.85 -40 MAX 6 UNIT V V 0.9 1.35 1.65 VCC VCC -12 -24 -24 12 24 24 8 85 V V V mA mA ns/V °C 3 of 6 QW-R502-784.A U74AC244 CMOS IC ELECTRICAL CHARACTERISTICS (TA =25°C , unless otherwise specified) PARAMETER SYMBOL High-Level Output Voltage VOH Low-Level Output Voltage VOL Input Leakage Current (A or OE inputs) II(LEAK) High-impedance state Current IOZ Quiescent Supply Current Input Capacitance ICC CIN MIN TYP MAX UNIT 2.9 4.4 5.4 V 2.56 3.86 4.86 0.1 0.1 0.1 V 0.36 0.36 0.36 VIN = VCC or GND, VCC = 5.5V ±0.1 VO = VCC or GND, VCC = 5.5V VI(OE) = VIL or VIH VIN = VCC or GND, IOUT = 0, VCC = 5.5V VIN = VCC or GND, VCC=5V μA ±0.25 μA 4 2.5 μA pF SWITCHING CHARACTERISTICS PARAMETER Propagation delay from input A to output Y, tpd Propagation delay from input OE to output Y, ten Propagation delay from input OE to output Y, tdis TEST CONDITIONS IOH = -50 μA, VCC = 3V IOH = -50 μA, VCC = 4.5V IOH = -50 μA, VCC = 5.5V IOH = -12 mA, VCC = 3V IOH = -24 mA, VCC = 4.5V IOH = -24 mA, VCC = 5.5V IOL = 50 μA, VCC = 3V IOL = 50 μA, VCC = 4.5V IOL = 50 μA, VCC = 5.5V IOL = 12 mA, VCC = 3V IOL = 24 mA, VCC = 4.5V IOL = 24 mA, VCC = 5.5V SYMBOL tPLH tPHL tPZH tPZL tPHZ tPLZ TEST CONDITIONS VCC=3.3±0.3V, CL=50pF, RL=500Ω VCC=5±0.5V, CL=50pF, RL=500Ω VCC=3.3±0.3V, CL=50pF, RL=500Ω VCC=5±0.5V, CL=50pF, RL=500Ω VCC=3.3±0.3V, CL=50pF, RL=500Ω VCC=5±0.5V, CL=50pF, RL=500Ω VCC=3.3±0.3V, CL=50pF, RL=500Ω VCC=5±0.5V, CL=50pF, RL=500Ω VCC=3.3±0.3V, CL=50pF, RL=500Ω VCC=5±0.5V, CL=50pF, RL=500Ω VCC=3.3±0.3V, CL=50pF, RL=500Ω VCC=5±0.5V, CL=50pF, RL=500Ω MIN 2 1.5 2 1.5 2 1.5 2.5 1.5 3 2.5 2.5 2 TYP 6.5 5 6.5 5 6 5 7.5 5.5 7 6.5 7.5 6.5 MAX UNIT 9 ns 7 9 ns 7 10.5 ns 7 10 ns 8 10 ns 9 10.5 ns 9 OPERATING CHARACTERISTICS PARAMETER Power dissipation capacitance per buffer/driver SYMBOL Cpd TEST CONDITIONS VCC = 5V, f=1MHz, CL=50pF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP UNIT 45 pF 4 of 6 QW-R502-784.A U74AC244 CMOS IC TEST CIRCUIT AND WAVEFORMS VCC 3.3V±0.3V 5V±0.5V Inputs VIN VCC VCC tr, tf ≤2.5ns ≤2.5ns TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH S1 OPEN VLOAD Open VM VLOAD CL RL VΔ VCC/2 VCC/2 2*VCC 2*VCC 50pF 50pF 500Ω 500Ω 3.3V±0.3V 5V±0.5V V IN Input VM VM 0V tPHL t PLH V OH Output VM VM V OL tPHL t PLH V OH Output VM VM V OL UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R502-784.A U74AC244 CMOS IC TEST CIRCUIT AND WAVEFORMS (Cont.) VIN Input VM VM 0V tPZL tPZL VLOAD/2 Output S 1 at VLOAD VM VOL tPZH tPZH VOH Output S 1 at Open VM 0V Notes: 1. CL includes probe and jig capacitance. 2. All input pulses are supplied by generators having the following characteristics: PRR ≤1MHz, ZO = 50Ω. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R502-784.A