74HC373

SN54HC373, SN74HC373OCTAL TRANSPARENT D-TYPE LATCHESWITH 3-STATE OUTPUTS SCLS140B – DECEMBER 1982 – REVISED MAY 1997

1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

DEight High-Current Latches in a Single

PackageDHigh-Current 3-State True Outputs Can

Drive up to 15 LSTTL LoadsDFull Parallel Access for Loading

DPackage Options Include Plastic

Small-Outline (DW), Shrink Small-Outline(DB), Thin Shrink Small-Outline (PW), andCeramic Flat (W) Packages, Ceramic ChipCarriers (FK), and Standard Plastic (N) andCeramic (J) 300-mil DIPs

descriptionThese 8-bit latches feature 3-state outputsdesigned specifically for driving highly capacitiveor relatively low-impedance loads. They areparticularly suitable for implementing bufferregisters, I/O ports, bidirectional bus drivers, andworking registers.

The eight latches of the ’HC373 are transparentD-type latches. While the latch-enable (LE) inputis high, the Q outputs follow the data (D) inputs.When LE is taken low, the Q outputs are latchedat the levels that were set up at the D inputs.

An output-enable (OE) input places the eightoutputs in either a normal logic state (high or lowlogic levels) or the high-impedance state. In thehigh-impedance state, the outputs neither loadnor drive the bus lines significantly. Thehigh-impedance state and increased driveprovide the capability to drive bus lines withoutinterface or pullup components.

OE does not affect the internal operations of the latches. Old data can be retained or new data can be enteredwhile the outputs are off.

The SN54HC373 is characterized for operation over the full military temperature range of –55°C to 125°C. TheSN74HC373 is characterized for operation from –40°C to 85°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

32120199101112134

5678

1817161514

8D7D7Q6Q6D

2D2Q3Q3D4D

1D1QOE5Q5DV8Q

4QGND

LE

SN54HC373...FK PACKAGE(TOP VIEW)

CC

SN54HC373...J OR W PACKAGESN74HC373...DB, DW, N, OR PW PACKAGE(TOP VIEW)

1234 5678910

20191817161514131211

OE1Q1D2D2Q3Q3D4D4QGNDVCC8Q8D7D7Q6Q6D5D5QLE

Copyright © 1997, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.SN54HC373, SN74HC373OCTAL TRANSPARENT D-TYPE LATCHESWITH 3-STATE OUTPUTS SCLS140B – DECEMBER 1982 – REVISED MAY 1997

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLE(each latch)

INPUTSOUTPUT

OELEDQ

LHHHLHLLLLXQ0

HXXZ

logic symbol†

1D31D42D73DEN11Q22Q5

3Q684D135D146D4Q9

5Q12

6Q15

OE

177D188DC111LE7Q168Q19

†This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

logic diagram (positive logic)OE

To Seven Other Channels1

1132LE

1DC11D1QSN54HC373, SN74HC373OCTAL TRANSPARENT D-TYPE LATCHESWITH 3-STATE OUTPUTS SCLS140B – DECEMBER 1982 – REVISED MAY 1997

3POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range†Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous output current, IO (VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous current through VCC or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Package thermal impedance, θJA (see Note 2):DB package 115°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DW package 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PW package 128°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and