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74LVX373 Low Voltage Octal Transparent Latch with 3-STATE Outputs
June 1993 Revised March 1999
74LVX373 Low Voltage Octal Transparent Latch with 3-STATE Outputs
General Description
The LVX373 consists of eight latches with 3-STATE outputs for bus organized system applications. The latches appear transparent to the data when Latch Enable (LE) is HIGH. When LE is LOW, the data satisfying the input timing requirements is latched. Data appears on the bus when the Output Enable (OE) is LOW. When OE is HIGH, the bus output is in the high impedance state. The inputs tolerate up to 7V allowing interface of 5V systems to 3V systems.
Features
s Input voltage translation from 5V to 3V s Ideal for low power/low noise 3.3V applications
Ordering Code:
Order Number 74LVX373M 74LVX373SJ 74LVX373MTC Package Number M20B M20D MTC20 Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names D0-D7 LE OE O0-O7 Description Data Inputs Latch Enable Input Output Enable Input 3-STATE Latch Outputs
(c) 1999 Fairchild Semiconductor Corporation
DS011613.prf
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74LVX373
Functional Description
The LVX373 contains eight D-type latches with 3-STATE standard outputs. When the Latch Enable (LE) input is HIGH, data on the Dn inputs enters the latches. In this condition the latches are transparent, i.e., a latch output will change state each time its D input changes. When LE is LOW, the latches store the information that was present on the D inputs a setup time preceding the HIGH-to-LOW transition of LE. The 3-STATE standard outputs are controlled by the Output Enable (OE) input. When OE is LOW, the standard outputs are in the 2-state mode. When OE is HIGH, the standard outputs are in the high impedance mode but this does not interfere with entering new data into the latches.
Truth Table
Inputs LE X H H L OE H L L L Dn X L H X Outputs On Z L H O0
H = HIGH Voltage Level L = LOW Voltage Level Z = High Impedance X = Immaterial O0 = Previous O0 before HIGH-to-LOW transition of Latch Enable
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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74LVX373
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Diode Current (IIK) VI = -0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = -0.5V VO = VCC +0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current (ICC or IGND) Storage Temperature (TSTG) Power Dissipation 75 mA -65C to +150C 180 mW 25 mA -20 mA +20 mA -0.5V to VCC + 0.5V -20 mA -0.5V to 7V -0.5V to +7.0V
Recommended Operating Conditions (Note 2)
Supply Voltage (VCC) Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) Input Rise and Fall Time (t/V) 2.0V to 3.6V 0V to 5.5V 0V to VCC -40C to +85C 0 ns/V to 100 ns/V
Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol VIH Parameter HIGH Level Input Voltage VIL LOW Level Input Voltage VOH HIGH Level Output Voltage VOL LOW Level Output Voltage IOZ IIN ICC 3-STATE Output Off-State Current Input Leakage Current Quiescent Supply Current 3.6 3.6 0.1 4.0 1.0 40.0 A A VCC 2.0 3.0 3.6 2.0 3.0 3.6 2.0 3.0 3.0 2.0 3.0 3.0 3.6 1.9 2.9 2.58 0.0 0.0 0.1 0.1 0.36 0.25 2.0 3.0 TA = +25C Min 1.5 2.0 2.4 0.5 0.8 0.8 1.9 2.9 2.48 0.1 0.1 0.44 2.5 A VIN = VIH or VIL VOUT = VCC or GND VIN = 5.5V or GND VIN = VCC or GND V V Typ Max TA = -40C to +85C Min 1.5 2.0 2.4 0.5 0.8 0.8 VIN = VIH or VIL IOH = -50 A IOH = -50 A IOH = -4 mA VIN = VIH or VIL IOL = 50 A IOL = 50 A IOL = 4 mA V V Max Units Conditions
Noise Characteristics (Note 3)
Symbol VOLP VOLV VIHD VILD Parameter Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage VCC (V) 3.3 3.3 3.3 3.3 TA = 25C Typ 0.5 -0.5 Limit 0.8 -0.8 2.0 0.8 V V V V Units CL (pF) 50 50 50 50
Note 3: Input tr = tf = 3 ns.
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74LVX373
AC Electrical Characteristics
Symbol tPLH tPHL Parameter Propagation Delay Time Dn to On 3.3 0.3 tPLH tPHL Propagation Delay Time LE to On 3.3 0.3 tPZL tPZH 3-STATE Output Enable Time 3.3 0.3 tPLZ tPHZ tW tS tH tOSLH tOSHL 3-STATE Output Disable Time LE Pulse Width, HIGH Setup Time, Dn to LE Hold Time, Dn to LE Output to Output Skew (Note 4) 2.7 3.3 0.3 2.7 3.3 0.3 2.7 3.3 0.3 2.7 3.3 0.3 2.7 3.3 6.5 5.0 6.0 4.0 1.0 1.0 1.5 1.5 2.7 2.7 VCC (V) 2.7 TA = +25C Min Typ 7.7 10.2 6.0 8.5 7.5 10.0 5.8 8.3 7.7 10.2 6.0 8.5 9.8 8.2 Max 15.0 18.5 9.7 13.2 14.5 18.0 9.3 12.8 15.0 18.5 9.7 13.2 18.0 12.8 TA = -40C to +85C Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 7.5 5.0 6.0 4.0 1.0 1.0 1.5 1.5 Max 18.5 22.0 11.5 15.0 17.5 21.0 11.0 14.5 18.5 22.0 11.5 15.0 21.0 14.5 ns ns ns ns ns CL = 50 pF ns ns ns Units Conditions CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 15 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 50 pF, RL = 1 k CL = 50 pF, RL = 1 k
Note 4: Parameter guaranteed by design. tOSLH = |tPLHm - tPLHn|, tOSHL = |tPHLm - tPHLn|
Capacitance
Symbol CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (Note 5)
Note 5: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.
Parameter
TA = +25C Min Typ 4 6 27 Max 10
TA = -40C to +85C Min Max 10
Units pF pF pF
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74LVX373
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D
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74LVX373 Low Voltage Octal Transparent Latch with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20 LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the www.fairchildsemi.com user.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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