UNISONIC TECHNOLOGIES CO., LTD U74HCT245
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1 UNISONIC TECHNOLOGIES CO., LTD U74HCT245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS DIP-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. The output-enable OE will isolate the device from the buses when high voltage is applied on it. SOP-20 SSOP-20 TSSOP-20 FEATURES * Operate from 4.5V to 5.5V * Typical t PD is 14ns at 5.5V * Inputs are TTL Voltage Compatible ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free U74HCT245L-D20-T U74HCT245G-D20-T DIP-20 Tube - U74HCT245G-S20-R SOP-20 Tape Reel U74HCT245G-R20-R SSOP-20 Tape Reel - U74HCT245G-P20-R TSSOP-20 Tape Reel MARKING DIP-20 SOP-20 / SSOP-20 / TSSOP-20 1 of 5 Copyright 2016 Unisonic Technologies Co., Ltd
2 PIN CONFIGURATION FUNCTION TABLE INPUT OE DIR FUNCTION H X 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 2 of 5
3 ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage V CC -0.5 ~ 7.0 V Input Clamp Current (V in <0) I IK ±20 ma Output Clamp Current (V OUT <0) I OK ±20 ma Output Current I OUT ±35 ma V CC or GND Current I CC ±70 ma Storage Temperature T STG -65 ~ +150 C Notes: 1. Absolute maximum ratings are those values beyond which the device could be 6permanently 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 SYMBOL MIN TYP MAX UNIT Supply Voltage V CC V Input Voltage V IN 0 V CC V Output Voltage V OUT 0 V CC V Input Transition Rise or Fall Rate t T 500 ns Operating Temperature T OPR C ELECTRICAL CHARACTERISTICS (T A =25 С, unless otherwise specified) High-Level input voltage V IH V CC =4.5V~5.5V V Low-Level output voltage V IL V CC =4.5V~5.5V V High-Level Output Voltage V CC =4.5V, I OH =-20μA V V CC =4.5V, I OH =-6mA V Low-Level Output Voltage V CC =4.5V, I OL =20μA V V CC =4.5V, I OH =6mA V Input Current of DIR or OE I I(LEAK) V CC =5.5V, V IN =V CC or GND ±0.1 ±100 na Output OFF -state current I OZ V CC =5.5V, V OUT =V CC or GND ±0.01 ±0.5 μa Quiescent Supply Current I CC V CC =5.5V, V IN =V CC or GND, I OUT =0 8 μa Additional Quiescent Supply Current I CC V CC =5.5V,One input at 0.5V or 2.4V,other inputs at 0 or V CC ma Input Capacitance of DIR or OE C IN V CC =5.5V, V IN =V CC or GND 3 10 pf UNISONIC TECHNOLOGIES CO., LTD 3 of 5
4 SWITCHING CHARACTERISTICS (T A =25 С, R L =1kΩ,unless otherwise specified) C L =50pF Propagation delay from input t PD V CC =4.5V ns (A or B) to output (B or A) (t PLH /t PHL ) V CC =5.5V ns 3-state output enable time from input t EN V CC =4.5V ns ( OE ) to output (A or B) (t PZL /t PZH ) V CC =5.5V ns 3-state output disable time from t DIS V CC =4.5V ns input ( OE ) to output (A or B) (t PLZ /t PHZ ) V CC =5.5V ns Output transition time, (A or B) t T V CC =4.5V 9 12 ns (t R /t F ) V CC =5.5V 8 11 ns C L =150pF Propagation delay from input t PD V CC =4.5V ns (A or B) to output (B or A) (t PLH /t PHL ) V CC =5.5V ns 3-state output enable time from input t EN V CC =4.5V ns ( OE ) to output (A or B) (t PZL /t PZH ) V CC =5.5V ns Output transition time, (A or B) t T V CC =4.5V ns (t R /t F ) V CC =5.5V ns OPERATING CHARACTERISTICS PARAMETER SYMBOL TEST CONDITIONS RATINGS UNIT Power Dissipation Capacitance C PD No load 40 pf UNISONIC TECHNOLOGIES CO., LTD 4 of 5
5 TEST CIRCUIT AND WAVEFORMS Note: C L includes probe and jig capacitance. P RR 1MHz, Z O = 50Ω, t R 6ns, t F 6ns OE 3V A/B 3V 1.3V 10% V CC 1.3V 90% Propagation Delay Times 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 5 of 5
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