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74VHCT373A Octal D-Type Latch with 3-STATE Outputs
July 1997 Revised April 1999
74VHCT373A Octal D-Type Latch with 3-STATE Outputs
General Description
The VHCT373A is an advanced high speed CMOS octal Dtype latch with 3-STATE output fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. This 8-bit D-type latch is controlled by a latch enable input (LE) and an output enable input (OE). The latches appear transparent to data when latch enable (LE) is HIGH. When LE is LOW, the data that meets the setup time is latched. When the OE input is HIGH, the eight outputs are in a high impedance state. Protection circuits ensure that 0V to 7V can be applied to the input and output (Note 1) pins without regard to the supply voltage. This device can be used to interface 3V to 5V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.
Note 1: Outputs in OFF-State.
Features
s High speed: tPD = 7.7 ns (typ) at TA = 25C s High Noise Immunity: VIH = 2.0V, VIL = 0.8V s Power Down Protection is provided on all inputs and outputs s Low Power Dissipation: ICC = 4 A (max) @ TA = 25C s Pin and Function Compatible with 74HCT373
Ordering Code:
Order Number 74VHCT373AM 74VHCT373ASJ 74VHCT373AMTC 74VHCT373AN Package Number M20B M20D MTC20 N20A 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 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter "X" to the ordering code
Logic Symbol
IEEE/IEC
Connection Diagram
Pin Descriptions
Pin Names D0-D7 LE OE O0-O7 Description Data Inputs Latch Enable Input Output Enable Input 3-STATE Outputs
(c) 1999 Fairchild Semiconductor Corporation
DS500027.prf
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74VHCT373A
Functional Description
The VHCT373A contains eight D-type latches with 3STATE 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 HIGHto-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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74VHCT373A
Absolute Maximum Ratings(Note 2)
Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) (Note 3) (Note 4) Input Diode Current (IIK) Output Diode Current (IOK) (Note 5) DC Output Current (IOUT) DC VCC/GND Current (ICC) Storage Temperature (TSTG) Lead Temperature (TL) (Soldering, 10 seconds) 260C 20 mA 25 mA 75 mA -65C to +150C -0.5V to VCC + 0.5V -0.5V to +7.0V -20 mA -0.5V to + 7.0V -0.5V to + 7.0V
Recommended Operating Conditions (Note 6)
Supply Voltage (VCC) Input Voltage (VIN ) Output Voltage (VOUT) (Note 3) (Note 4) Operating Temperature (TOPR) Input Rise and Fall Time (tr, tf) VCC = 5.0 0.5V 0 ns/V 20 ns/V
Note 2: Absolute Maximum Ratings are values beyond which the device may be damaged or have its useful life impaired. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation outside databook specifications. Note 3: HIGH or LOW state. IOUT absolute maximum rating must be observed. Note 4: When outputs are in OFF-State or when VCC = OV. Note 5: VOUT < GND, V OUT > VCC (Outputs Active). Note 6: Unused inputs must be held HIGH or LOW. They may not float.
4.5V to + 5.5V 0V to + 5.5V 0V to VCC 0V to 5.5V -40C to +85C
DC Electrical Characteristics
Symbol VIH VIL VOH VOL IOZ IIN ICC ICCT IOFF Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Voltage 3-STATE Output OFF-State Current Input Leakage Current Quiescent Supply Current Maximum ICC/Input Output Leakage Current (Power Down State) VCC (V) 4.5 5.5 4.5 5.5 4.5 4.5 4.5 4.5 5.5 0 - 5.5 5.5 5.5 0.0 4.40 3.94 0.0 0.1 0.36 0.25 0.1 4.0 1.35 +0.5 4.50 TA = +25C Min 2.0 2.0 0.8 0.8 4.40 3.80 0.1 0.44 2.5 1.0 40.0 1.50 +0.5 Typ Max TA = -40C to +85C Min 2.0 2.0 0.8 0.8 Max Units V V V V V V A A A mA A VIN = VIH VIN = VIH IOH = -50 A IOL = 50 A Conditions
or VIL IOH = -8 mA or VIL IOL = 8 mA VIN = VIH or VIL VOUT = VCC or GND VIN = 5.5V or GND VIN = VCC or GND VIN = 3.4V Other Inputs = VCC or GND VOUT = 5.5V
Noise Characteristics
Symbol VOLP (Note 7) VOLV (Note 7) VIHD (Note 7) VILD (Note 7)
Note 7: Parameter guaranteed by design.
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) 5.0 5.0 5.0 5.0
TA = +25C Typ 1.2 -1.2 Limits 1.6 -1.6 2.0 0.8
Units V V V V
Conditions CL = 50 pF CL = 50 pF CL = 50 pF CL = 50 pF
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74VHCT373A
AC Electrical Characteristics
Symbol tPLH tPHL tPLH tPHL tPZL tPZH tPLZ tPHZ tOSLH tOSHL CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance 4 6 25 10 10 pF pF pF VCC = Open VCC = 5.0V (Note 9) Output to Output Skew 5.0 0.5 1.0 1.0 3-STATE Output Disable Time Parameter Propagation Delay Time (LE to On) Propagation Delay Time (D to On) 3-STATE Output Enable Time VCC (V) 5.0 0.5 5.0 0.5 5.0 0.5 5.0 0.5 TA = +25C Min Typ 7.7 8.5 5.1 5.9 6.3 7.1 8.8 Max 12.3 13.3 8.5 9.5 10.9 11.9 11.2 TA = -40C to +85C Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 13.5 14.5 9.5 10.5 12.5 13.5 12.0 Units ns ns ns ns Conditions CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF RL = 1 k CL = 15 pF CL = 50 pF RL = 1 k CL = 50 pF (Note 8)
Note 8: Parameter guaranteed by design. tOSLH = |tPLH max - tPLH min |; tOSHL = |tPHL max - tPHL min| Note 9: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) = CPD * VCC * fIN + ICC/8 (per F/F).
AC Operating Requirements
Symbol tW(H) tS tH Parameter Minimum Pulse Width (LE) Minimum Set-Up Time Minimum Hold Time VCC (V) 5.0 0.5 5.0 0.5 5.0 0.5 TA = +25C Min 6.5 1.5 3.5 Typ Max TA = -40C to +85C Min 8.5 1.5 3.5 Max Units ns ns ns
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74VHCT373A
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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74VHCT373A
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
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74VHCT373A Octal D-Type Latch with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A
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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