UNISONIC TECHNOLOGIES CO., LTD U74AHC245 CMOS IC OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS DESCRIPTION The U74AHC245 octal bus transceivers is designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable ( OE ) input can be used to disable the device so that the buses are effectively isolated. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. FEATURES * Operating range 2V to 5.5V VCC ORDERING INFORMATION Ordering Number U74AHC245G-P20-R U74AHC245G-R20-R U74AHC245G-S20-R Package TSSOP-20 SSOP-20 SOP-20 Packing Tape Reel Tape Reel Tape Reel MARKING www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 5 QW-R502-987.B U74AHC245 CMOS IC PIN CONFIGURATION FUNCTION TABLE INPUT OE H L L Note: H: HIGH voltage level; L: LOW voltage level; X: Don’t care FUNCTION DIR X H L Isolation Transmit data from A bus to B bus Transmit data from B bus to A bus LOGIC DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R502-987.B U74AHC245 CMOS IC ABSOLUTE MAXIMUM RATING (TA=25°С, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC -0.5~7.0 V Input Voltage Range VI -0.5~7.0 V Output Voltage Range VO -0.5~VCC+0.5 V Input Clamp Current (ViN<0) IIK -20 mA Output Clamp Current (VO<0 or VO>VCC) IOK ±20 mA Output Current IOUT ±25 mA VCC or GND Current ICC ±75 mA Storage Temperature TSTG -65 ~ +150 °C Notes: 1. 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. 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. RECOMMENDED OPERATING CONDITIONS (TA=25°С, unless otherwise specified) PARAMETER Supply Voltage Input Voltage Output Voltage Operating Temperature Input Transition Rise or Fall Rate SYMBOL VCC VIN VOUT TOPR VCC =3.3V±0.3V VCC =5V±0.5V Operating Free-air Temperature MIN 2 0 0 -40 TYP ∆t/∆v TA -40 MAX 5.5 5.5 VCC 85 100 20 85 UNIT V V V °C ns/V °C THERMAL CHARACTERISTICS PARAMETER Junction to Ambient SYMBOL SOP-20 SSOP-20 TSSOP-20 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw θJA RATINGS 80 96 103 UNIT °C/W °C/W °C/W 3 of 5 QW-R502-987.B U74AHC245 CMOS IC ELECTRICAL CHARACTERISTICS (TA=25°С, unless otherwise specified) PARAMETER SYMBOL HIGH-level input voltage VIH LOW-lever output voltage VIL High-Level Output Voltage Low-Level Output Voltage VOH VOL TEST CONDITIONS VCC=2V VCC=3V VCC=5.5V VCC=2V VCC=3V VCC=5.5V VCC=2V, IOH=-50μA VCC=3V, IOH=-50μA VCC=4.5V, IOH=-50μA VCC=3V, IOH=-4mA VCC=4.5V, IOH=-8mA VCC=2V, IOL=50μA VCC=3V, IOL=50μA VCC=4.5V, IOL=50μA VCC=3V, IOL=4mA MIN 1.5 2.1 3.85 TYP V 0.5 0.9 1.65 1.9 2.9 4.4 2.58 3.94 2 3 4.5 A or B inputs OE or DIR Output OFF-state current Quiescent Supply Current II(LEAK) VCC=5.5V, VIN=VCC or GND VCC=0 to 5.5V, VIN=VCC or GND VCC=5.5V, VOUT=VCC or GND VCC=5.5V, VIN=VCC or GND, IOUT=0 Input Capacitance( OE or DIR) CI VCC=5V, VIN=VCC or GND 2.5 Input Capacitance(A or B inputs) CIO VCC=5V, VIN=VCC or GND 4 ±0.1 μA ±0.25 4 μA μA 10 pF pF SWITCHING CHARACTERISTICS (RL=1kΩ, TA=25°С, unless otherwise specified) PARAMETER SYMBOL Propagation delay from input (A or B) to output (B or A) tpd (tPLH/tPHL) 3-state output enable time from input ten (tPZL/tPZH) ( OE ) to output (A or B) 3-state output disable time from input ( OE ) to output (A or B) V 0.36 IOZ IQ V V 0.1 0.1 0.1 0.36 VCC=4.5V, IOL=8mA Input Leakage Current MAX UNIT tdis (tPLZ/tPHZ) TEST CONDITIONS VCC=3.3V±0.3V, CL=15pF VCC=3.3V±0.3V, CL=50pF VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF VCC=3.3V±0.3V, CL=15pF VCC=3.3V±0.3V, CL=50pF VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF VCC=3.3V±0.3V, CL=15pF VCC=3.3V±0.3V, CL=50pF VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF MIN TYP MAX UNIT 5.8 8.4 8.3 11.9 ns 4 5.5 5.5 7.5 8.5 13.2 11 16.7 ns 5.8 8.5 7.3 10.6 8.9 12.5 11.5 15.8 ns 5.6 7.8 7 9.7 OPERATING CHARACTERISTICS(VCC=5V, TA=25°С, unless otherwise specified) PARAMETER Power Dissipation Capacitance SYMBOL CPD TEST CONDITIONS No load, f=1MHz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX UNIT 14 pF 4 of 5 QW-R502-987.B U74AHC245 CMOS IC TEST CIRCUIT AND WAVEFORMS VCC K1 From Output CL (Note 1) RL K2 Notes: 1. CL includes probe and jig capacitance. 2. All input pulses are supplied by generators having the following characteristics: PRR≤1MHZ, ZO=50Ω, tr ≤ 3ns, tf ≤ 3ns. 3. The outputs are measured one at a time with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms 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 5 of 5 QW-R502-987.B