UNISONIC TECHNOLOGIES CO., LTD U74AHCT373 CMOS IC OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS DESCRIPTION The U74AHCT373 is an octal transparent D-type latch with 3-state outputs and 8 channels. When the OE input is low and the LE input is high, the Q TSSOP-20 outputs follow the D inputs. When OE is low and LE is low, the Q outputs are latched at the logic levels of the D inputs. When the OE input is high, the outputs are in the high-impedance. The OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. 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. FEATURES * Inputs are TTL-Voltage Compatible * Operate from 4.5V to 5.5V * Inputs Accept Voltages to 5.5V * Max tPD of 8.5ns at VCC=5V, CL=15pF ORDERING INFORMATION Ordering Number Lead Free Halogen Free U74AHCT373L-P20-R U74AHCT373G-P20-R U74AHCT373L-P20-T U74AHCT373G-P20-T www.unisonic.com.tw Copyright © 2011 Unisonic Technologies Co., Ltd Package Packing TSSOP-20 TSSOP-20 Tape Reel Tube 1 of 6 QW-R502-685.A U74AHCT373 CMOS IC PIN CONFIGURATION OE 1 20 VCC 1Q 2 19 8Q 1D 3 18 8D 2D 4 17 7D 2Q 5 16 7Q 3Q 6 15 6Q 3D 7 14 4D 8 13 5D 4Q 9 12 GND 10 6D 5Q 11 LE FUNCTION TABLE INPUTS( OE ) INPUTS(LE) L H L H L L H X Note: H: HIGH voltage level; L: LOW voltage level. LOGIC SYMBOL LOGIC DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw INPUTS(D) H L X X OUTPUT(Q) H L Q0 Z 2 of 6 QW-R502-685.A U74AHCT373 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage Range VCC -0.5 ~ 7 V Input Voltage Range (Note 3) VI -0.5 ~ 7 V Output Voltage Range (Note 3) VO -0.5 ~ VCC +0.5 V Input Clamp Current IIK -20 mA Output Clamp Current IOK ±20 mA Output Current IO ±25 mA VCC or GND Current ICC ±75 mA Storage Temperature TSTG -65 ~ +150 ℃ Note: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. 2. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. RECOMMENDED OPERATING CONDITIONS PARAMETER Supply Voltage High-Level Input Voltage Low-Level Input Voltage Input Voltage Output Voltage High-Level Output Current Low-Level Output Current Input Rise or Fall Times Operating free-air temperature SYMBOL VCC VIH VIL VIN VOUT IOH IOL tR, tF TA MIN 4.5 2 TYP MAX 5.5 UNIT V V V V V mA mA ns/V ℃ 0.8 5.5 VCC -8 8 20 85 0 0 -40 ELECTRICAL CHARACTERISTICS (TA=25°C) PARAMETER SYMBOL Output Voltage High-Level VOH Output Voltage Low-Level VOL Input Leakage Current Leakage Current (For output in high-impedance state) Quiescent Supply Current II(LEAK) Additional Quiescent Supply Current ΔICC Input Capacitance Output Capacitance CI CO IOZ ICC TEST CONDITIONS VCC=4.5V, IOH=-50μA VCC=4.5V, IOH=-8mA VCC=4.5V, IOL=50μA VCC=4.5V, IOL=8mA VCC=0V to 5.5V, VIN=0 or 5.5V VCC=5.5V, VIN=VIH or VIH, VOUT=0 or 5.5V VCC=5.5V, VIN=VCC or GND, IOUT=0 VCC=5.5V, one input at 3.4V, Other inputs at VCC or GND VCC=5V, VIN=VCC or GND VCC=5V, VOUT=VCC or GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 4.4 3.94 TYP 4.5 MAX UNIT V 0.1 0.36 ±0.1 V μA ±0.25 μA 4 9 4 μA 1.35 mA 10 pF pF 3 of 6 QW-R502-685.A U74AHCT373 CMOS IC SWITCHING CHARACTERISTICS PARAMETER SYMBOL From D to Q tPLH/tPHL From LE to Q From OE to Q tPZL/tPZH From OE to Q tPLZ/tPHZ Pulse Width, LE High Setup Time, Data Before LE↓ Hold Time, Data After LE↓ tW tSU tH TEST CONDITIONS VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF VCC=5V±0.5V, CL=15pF VCC=5V±0.5V, CL=50pF VCC=5V±0.5V VCC=5V±0.5V VCC=5V±0.5V MIN TYP 5.1 5.9 7.7 8.5 6.3 7.1 6 6.8 MAX 8.5 9.5 12.3 13.3 10.9 11.9 10.2 11.2 6.5 1.5 3.5 UNIT ns ns ns ns ns ns OPERATING CHARACTERISTICS(TA=25°С) PARAMETER Power Dissipation Capacitance SYMBOL TEST CONDITIONS CPD No load, f=1MHz UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP 17 MAX UNIT pF 4 of 6 QW-R502-685.A U74AHCT373 CMOS IC TEST CIRCUIT AND WAVEFORMS VCC 5V±0.5V Input VIN tR, tF VCC ≤3ns TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH S1 Open VLOAD GND VM VLOAD CL RL VΔ VCC/2 VCC 15pF 50pF 1kΩ 0.5V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R502-685.A U74AHCT373 CMOS IC TEST CIRCUIT AND WAVEFORMS(Cont.) VIN Input VM VM tPLH tPHL 0V VOH Output VM VM VOL tPLH tPHL VOH VM Output VM VOL Voltage Waveforms Propagation Delay Times Note: A. CL includes probe and jig capacitance. B. PRR ≤1MHz, ZO = 50Ω, tR ≤3ns, tF ≤3ns. 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-R502-685.A