UNISONIC TECHNOLOGIES CO., LTD U74HCT245 CMOS IC OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SOP-20 DESCRIPTION The U74HCT245 is designed for the asynchronous communication between data buses. While the direction-control(DIR) is high, data transmits from the A bus to the B bus. Data transmits from the B bus to the A bus if DIR is low. SSOP-20 The output-enable OE will isolate the device from the buses when high voltage is applied on it. TSSOP-20 FEATURES * Operate from 4.5V to 5.5V * Typical tPD is 14ns at 5.5V * Inputs are TTL Voltage Compatible ORDERING INFORMATION Ordering Number U74HCT245G-P20-R U74HCT245G-R20-R U74HCT245G-S20-R Package TSSOP-20 SSOP-20 SOP-20 Packing Tape Reel Tape Reel Tape Reel MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R502-646.C U74HCT245 CMOS IC PIN CONFIGURATION FUNCTION TABLE INPUT OE DIR FUNCTION X H Isolation L H Transmit data from A bus to B bus L L Transmit data from B bus to A bus Note: H: HIGH voltage level; L: LOW voltage level. LOGIC DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R502-646.C U74HCT245 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC -0.5~7.0 V Input Clamp Current (ViN<0) IIK ±20 mA Output Clamp Current (VOUT<0) IOK ±20 mA Output Current IOUT ±35 mA VCC or GND Current ICC ±70 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 PARAMETER Supply Voltage Input Voltage Output Voltage Input Transition Rise or Fall Rate Operating Temperature SYMBOL VCC VIN VOUT tT TOPR MIN 4.5 0 0 TYP 5 -40 MAX 5.5 VCC VCC 500 85 UNIT V V V ns °C ELECTRICAL CHARACTERISTICS (TA=25°С, unless otherwise specified) PARAMETER High-Level input voltage Low-Level output voltage SYMBOL TEST CONDITIONS VIH VCC=4.5V~5.5V VIL VCC=4.5V~5.5V VCC=4.5V, IOH=-20μA High-Level Output Voltage VOH VCC=4.5V, IOH=-6mA VCC=4.5V, IOL=20μA Low-Level Output Voltage VOL VCC=4.5V, IOH=6mA Input Current of DIR or OE II(LEAK) VCC=5.5V, VIN=VCC or GND Output OFF -state current IOZ VCC=5.5V, VOUT=VCC or GND Quiescent Supply Current ICC VCC=5.5V, VIN=VCC or GND, IOUT=0 VCC=5.5V,One input at 0.5V or ∆ICC Additional Quiescent Supply Current 2.4V,other inputs at 0 or VCC Input Capacitance of DIR or OE VCC=5.5V, VIN=VCC or GND CIN UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2.0 4.4 3.98 TYP 1.6 1.2 4.499 4.3 0.001 0.17 ±0.1 ±0.01 MAX 0.1 0.26 ±100 ±0.5 8 UNIT V V V V V V nA μA μA 1.4 2.4 mA 3 10 pF 0.8 3 of 5 QW-R502-646.C U74HCT245 CMOS IC SWITCHING CHARACTERISTICS (TA=25°С, RL=1kΩ,unless otherwise specified) CL=50pF PARAMETER Propagation delay from input (A or B) to output (B or A) SYMBOL TEST CONDITIONS tPD VCC=4.5V (tPLH/tPHL) VCC=5.5V 3-state output enable time from input VCC=4.5V tEN ( OE ) to output (A or B) (tPZL/tPZH) VCC=5.5V 3-state output disable time from VCC=4.5V tDIS input ( OE ) to output (A or B) (tPLZ/tPHZ) VCC=5.5V tT VCC=4.5V Output transition time, (A or B) (tR/tF) VCC=5.5V CL=150pF PARAMETER SYMBOL TEST CONDITIONS Propagation delay from input tPD VCC=4.5V (A or B) to output (B or A) (tPLH/tPHL) VCC=5.5V 3-state output enable time from input VCC=4.5V tEN ( OE ) to output (A or B) (tPZL/tPZH) VCC=5.5V tT VCC=4.5V Output transition time, (A or B) (tR/tF) VCC=5.5V MIN TYP 16 14 25 22 26 23 9 8 MAX 22 20 46 41 40 36 12 11 UNIT ns ns ns ns ns ns ns ns MIN TYP 20 18 36 30 17 14 MAX 30 27 59 53 42 38 UNIT ns ns ns ns ns ns OPERATING CHARACTERISTICS PARAMETER Power Dissipation Capacitance SYMBOL TEST CONDITIONS CPD No load UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw RATINGS 40 UNIT pF 4 of 5 QW-R502-646.C U74HCT245 CMOS IC TEST CIRCUIT AND WAVEFORMS Note: CL includes probe and jig capacitance. PRR ≤1MHz, ZO = 50Ω, tR ≤6ns, tF ≤6ns 3V OE 1.3V 1.3V 0V 3V A/B 1.3V 1.3V VCC B/A 0V B/A VOH 1.3V 1.3V B/A 1.3V 10% 1.3V VOL Propagation Delay Times VOL 90% VOH 0V Enable and Disable Times 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-R502-646.C