UNISONIC TECHNOLOGIES CO., LTD U74HCT373 CMOS IC OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS DESCRIPTION The U74HCT373 is an octal transparent D-type latch with 3-state outputs, and it has 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 21ns at VCC=5.5V, CL=50pF * Typ VOL< 0.26V at VCC=4.5V, IOL=6mA, TA=25°C * Typ VOH> 3.94V at VCC=4.5V, IOH=-6mA, TA=25°C ORDERING INFORMATION Ordering Number Lead Free Halogen Free U74HCT373L-P20-R U74HCT373G-P20-R U74HCT373L-P20-T U74HCT373G-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-R502-655.A U74HCT373 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 6D 4D 8 13 5D 4Q 9 12 5Q GND 10 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-R502-655.A U74HCT373 CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply voltage VCC -0.5 ~ 7 V Input voltage (Note 3) VI -0.5 ~ 7 V Output voltage (Note 3) VO -0.5 ~ VCC +0.5 V Input clamp current IIK -20 mA Output clamp current IOK ±20 mA Output current IO ±35 mA VCC or GND current ICC ±70 mA Storage temperature TSTG -65 ~ +150 ℃ Note: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Note: Absolute maximum ratings are stress ratings only and functional device operation is not implied. Note: 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL VCC VIH VIL VIN VOUT tR, tF TA Supply Voltage High-Level Input Voltage Low-Level Input Voltage Input Voltage Output Voltage Input Rise or Fall Times Operating free-air temperature MIN 4.5 2 TYP MAX 5.5 UNIT V V V V V ns/V ℃ 0.8 5.5 VCC 500 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 IOZ ICC CI TEST CONDITIONS VCC=4.5V, IOH=-20μA VCC=4.5V, IOH=-6mA VCC=4.5V, IOL=20μA VCC=4.5V, IOL=6mA VCC=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 0.5V or3.4V, Other Inputs at VCC or GND VCC=4.5V to 5V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 4.4 3.98 TYP 4.499 4.3 0.001 0.17 ±0.1 MAX UNIT ±0.01 ±0.5 μA 8 μA V 0.1 V 0.26 ±100 nA 1.4 2.4 mA 3 10 pF 3 of 6 QW-R502-655.A U74HCT373 SWITCHING CHARACTERISTICS PARAMETER From D to Q From LE to Q From OE to Q From OE to Q Output transition rise/fall time Pulse Width, LE high Setup Time, data before LE↓ Hold Time, data after LE↓ CMOS IC SYMBOL TEST CONDITIONS VCC=4.5V, CL=50pF VCC=5.5V, CL=50pF VCC=4.5V, CL=150pF tPD VCC=5.5V, CL=150pF (tPLH/tPHL) VCC=4.5V, CL=50pF VCC=5.5V, CL=50pF VCC=4.5V, CL=150pF VCC=5.5V, CL=150pF VCC=4.5V, CL=50pF tEN VCC=5.5V, CL=50pF (tPZL/tPZH) VCC=4.5V, CL=150pF VCC=5.5V, CL=150pF tDIS VCC=4.5V, CL=50pF (tPLZ/tPHZ) VCC=5.5V, CL=50pF VCC=4.5V, CL=50pF tT VCC=5.5V, CL=50pF (tR/tF) VCC=4.5V, CL=150pF VCC=5.5V, CL=150pF VCC=4.5V tW VCC=5.5V VCC=4.5V tSU VCC=5.5V VCC=4.5V tH VCC=5.5V MIN TYP 25 21 MAX 35 32 32 52 27 47 28 25 38 36 26 23 33 28 23 22 10 9 18 16 35 32 52 47 35 32 52 47 35 32 12 11 42 38 20 17 10 9 10 10 UNIT ns ns ns ns ns ns ns OPERATING CHARACTERISTICS(TA=25°С) PARAMETER Power Dissipation Capacitance SYMBOL TEST CONDITIONS CPD No Load UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw RATINGS 50 UNIT pF 4 of 6 QW-R502-655.A U74HCT373 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-R502-655.A U74HCT373 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 ≤6ns, tF ≤6ns. 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-R502-655.A