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SN54AC373, SN74AC373

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS540D − OCTOBER 1995 − REVISED OCTOBER 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D2-V to 6-V VCC Operation

DInputs Accept Voltages to 6 V

DMax tpd of 9.5 ns at 5 V

D3-State Noninverting Outputs Drive Bus

Lines Directly

DFull Parallel Access for Loading

description/ordering information

These 8-bit latches feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads. The devices

are particularly suitable for implementing buffer

registers, I/O ports, bidirectional bus drivers, and

working registers.

The eight latches are D-type transparent latches.

When the latch-enable (LE) input is high, the Q

outputs follow the data (D) inputs. When LE is

taken low, the Q outputs are latched at the logic

levels set up at the D inputs.

A buffered output-enable (OE) input can be used

to place the eight outputs in either a normal logic

state (high or low logic levels) or the

high-impedance state. In the high-impedance

state, the outputs neither load nor drive the bus

lines significantly. The high-impedance state and

increased drive provide the capability to drive bus

lines in bus-organized systems without need for

interface or pullup components.

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.

ORDERING INFORMATION

TAPACKAGE†ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N Tube SN74AC373N SN74AC373N

SOIC DW

Tube SN74AC373DW

AC373

SOIC − DW Tape and reel SN74AC373DWR AC373

−40° °C to 85 C SOP − NS Tape and reel SN74AC373NSR AC373

40 C

85 C

SSOP − DB Tape and reel SN74AC373DBR AC373

TSSOP PW

Tube SN74AC373PW

AC373

TSSOP − PW Tape and reel SN74AC373PWR AC373

CDIP − J Tube SNJ54AC373J SNJ54AC373J

−55° °C to 125 C CFP − W Tube SNJ54AC373W SNJ54AC373W

55 C

125 C

LCCC − FK Tube SNJ54AC373FK SNJ54AC373FK

†Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

GND

VCC

3 2 1 20 19

9 10 11 12 13

5D 8Q

GND

SN54AC373 . . . FK PACKAGE

(TOP VIEW)

SN54AC373 . . . J OR W PACKAGE

SN74AC373 . . . DB, DW, N, NS, OR PW PACKAGE

(TOP VIEW)

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

SN54AC373, SN74AC373

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS540D − OCTOBER 1995 − REVISED OCTOBER 2003

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

description/ordering information (continued)

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

FUNCTION TABLE

(each latch)

INPUTS OUTPUT

OE LE D

OUTPUT

L H H H

L H L L

L L X Q0

H X X Z

logic diagram (positive logic)

To Seven Other Channels

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI (see Note 1) −0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, VO (see Note 1) −0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, IIK (VI < 0 or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output clamp current, IOK (VO < 0 or VO

> VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous output current, IO (VO = 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous current through V

CC or GND ±200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Note 2): DB package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DW package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NS package 60°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package 83°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

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

SN54AC373, SN74AC373

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS540D − OCTOBER 1995 − REVISED OCTOBER 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions (see Note 3)

SN54AC373 SN74AC373

UNIT

MIN MAX MIN MAX UNIT

VCC Supply voltage 2 6 2 6 V

VCC = 3 V 2.1 2.1

VIH High-level input voltage VCC = 4.5 V 3.15 3.15 V

VIH

High level

input

voltage

VCC = 5.5 V 3.85 3.85

VCC = 3 V 0.9 0.9

VIL Low-level input voltage VCC = 4.5V 1.35 1.35 V

VIL

Low level

input

voltage

VCC = 5.5 V 1.65 1.65

VIInput voltage 0 VCC 0 VCC V

VOOutput voltage 0 VCC 0 VCC V

VCC = 3 V −12 −12

IOH High-level output current VCC = 4.5 V −24 −24 mA

IOH

High level

output

current

VCC = 5.5 V −24 −24

VCC = 3 V 12 12

IOL Low-level output current VCC = 4.5 V 24 24 mA

IOL

Low level

output

current

VCC = 5.5 V 24 24

Δ Δt/ v 8 8 ns/VInput transition rise or fall rate

TAOperating free-air temperature −55 125 −40 85 C°

NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

A = 25°C SN54AC373 SN74AC373

UNIT

PARAMETER VTEST CONDITIONS CC MIN TYP MAX MIN MAX MIN MAX UNIT

3 V 2.9 2.9 2.9

IOH = −50 μA4.5 V 4.4 4.4 4.4

IOH

5.5 V 5.4 5.4 5.4

VOH IOH = −12 mA 3 V 2.56 2.4 2.46 V

I 24 mA

4.5 V 3.86 3.7 3.76

IOH = −24 mA 5.5 V 4.86 4.7 4.76

3 V 0.1 0.1 0.1

IOL = 50 μA4.5 V 0.1 0.1 0.1

IOL

5.5 V 0.1 0.1 0.1

VOL IOL = 12 mA 3 V 0.36 0.5 0.44 V

I 24 mA

4.5 V 0.36 0.5 0.44

IOL = 24 mA 5.5 V 0.36 0.5 0.44

IIVI = VCC or GND 5.5 V ± ± ± μ0.1 1 1 A

IOZ VO = VCC or GND 5.5 V ± ± ± μ0.25 5 2.5 A

ICC VI = VCC or GND, IO = 0 5.5 V 4 80 40 Aμ

CiVI = VCC or GND 5 V 4.5 pF

Product specificaties

Merk:	Texas Instruments
Categorie:	Niet gecategoriseerd
Model:	SN74AC373PWR
Breedte:	6.6 mm
Diepte:	4.5 mm
Hoogte:	1.05 mm
Breedte verpakking:	449 mm
Diepte verpakking:	853 mm
Hoogte verpakking:	35 mm
Soort:	Logic IC
Type verpakking:	TSSOP
Aantal per verpakking:	2000 stuk(s)
Temperatuur bij opslag:	-65 - 150 °C
Bedrijfstemperatuur (T-T):	-40 - 85 °C
Aantal pinnen:	20
Breedte (met pennen):	6.6 mm
Diepte (met pennen):	6.6 mm
Hoogte (met pennen):	1.2 mm