Texas Instruments SN74ACT373DBLE, SN74ACT373DBR, SN74ACT373DW, SN74ACT373DWR, SN74ACT373N Datasheet

SN54ACT373, SN74ACT373

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS544D – OCTOBER 1995 – REVISED JANUARY 2000

D

Inputs Are TTL-Voltage Compatible

D

EPIC

 (Enhanced-Performance Implanted

SN54ACT373 ...J OR W PACKAGE

SN74ACT373 . . . DB, DW, N, OR PW PACKAGE

(TOP VIEW)

CMOS) 1-µm Process

D

Package Options Include Plastic
Small-Outline (DW) Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK) and
Flatpacks (W), and Standard Plastic (N) and
Ceramic (J) DIPs

description

These 8-bit latches feature 3-state outputs
designed specifically for driving highly capacitive

GND

OE

1Q
1D
2D
2Q
3Q
3D
4D
4Q

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

V
8Q
8D
7D
7Q
6Q
6D
5D
5Q
LE

CC

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

SN54ACT373 . . . FK PACKAGE

2D
2Q
3Q
3D
4D

(TOP VIEW)

1D1QOE

3212019

4
5
6
7
8

910111213

V

CC

8Q

18
17
16
15
14

8D
7D
7Q
6Q
6D

state (high or low logic levels) or the
high-impedance state. In the high-impedance
state, the outputs neither load nor drive the bus

4Q

GND

LE

5Q

5D

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.
The SN54ACT373 is characterized for operation over the full military temperature range of –55°C to 125°C. The

SN74ACT373 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 of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

EPIC is a trademark of Texas Instruments Incorporated.

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLE

(each latch)

INPUTS

OE LE D

L H H H
L HL L
L LX Q

H X X Z

OUTPUT

Q

0

Copyright  2000, Texas Instruments Incorporated

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.

1

SN54ACT373, SN74ACT373
OCTAL D-TYPE TRANSPARENT LATCHES
WITH 3-STATE OUTPUTS

SCAS544D – OCTOBER 1995 – REVISED JANUARY 2000

1
11

3
4
7
8
13
14
17
18

†

EN
C1

1D

2
5
6

9
12
15
16
19

logic diagram (positive logic)

1

OE

11

LE

1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q

1D

3

To Seven Other Channels

C1
1D

2

1Q

logic symbol

OE

LE

1D
2D
3D
4D
5D
6D
7D
8D

†

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

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, V
Input clamp current, IIK (VI < 0 or VI > V
Output clamp current, IOK (VO < 0 or VO > V

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

Continuous current through V

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

Storage temperature range, T

‡

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.

(see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

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

CC

±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC)

±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC)

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

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

PW package 83°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

‡

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

UNIT

PARAMETER

TEST CONDITIONS

V

UNIT

I

50 µA

V

I

mA

V

I

A

V

I

mA

V

UNIT

SN54ACT373, SN74ACT373

OCTAL D-TYPE TRANSPARENT LATCHES

WITH 3-STATE OUTPUTS

SCAS544D – OCTOBER 1995 – REVISED JANUARY 2000

recommended operating conditions (see Note 3)

SN54ACT373 SN74ACT373

MIN MAX MIN MAX

V
V
V
V
V
I

OH

I

OL

∆t/∆v Input transition rise or fall rate 0 8 0 8 ns/V
T

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

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

†

Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.

‡

This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.

Supply voltage 4.5 5.5 4.5 5.5 V

CC

High-level input voltage 2 2 V

IH

Low-level input voltage 0.8 0.8 V

IL

Input voltage 0 V

I

Output voltage 0 V

O

High-level output current –24 –24 mA
Low-level output current 24 24 mA

Operating free-air temperature –55 125 –40 85 °C

A

Implications of Slow or Floating CMOS Inputs

= –

OH

= –24

OH

IOH = –50 mA
IOH = –75 mA

= 50 µ

OL

= 24

OL

IOL = 50 mA
IOL = 75 mA
VO = VCC or GND 5.5 V ±0.25 ±5 ±2.5 µA
VI = VCC or GND 5.5 V ±0.1 ±1 ±1 µA
VI = VCC or GND, IO = 0 5.5 V 4 80 40 µA
One input at 3.4 V ,

Other inputs at GND or V
VI = VCC or GND 5 V 4.5 pF

†
†

†
†

I
I
I

∆I
C

OH

OL

OZ
I
CC

i

CC

‡

, literature number SCBA004.

CC

4.5 V 4.4 4.49 4.4 4.4

5.5 V 5.4 5.49 5.4 5.4

4.5 V 3.86 3.7 3.76

5.5 V 4.86 4.7 4.76

5.5 V 3.85

5.5 V 3.85

4.5 V 0.1 0.1 0.1

5.5 V 0.1 0.1 0.1

4.5 V 0.36 0.44 0.44

5.5 V 0.36 0.44 0.44

5.5 V 1.65

5.5 V 1.65

CC

5.5 V 0.6 1.5 1.5 mA

TA = 25°C SN54ACT373 SN74ACT373

MIN TYP MAX MIN MAX MIN MAX

CC
CC

0 V
0 V

CC
CC

V
V

timing requirements over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V
(unless otherwise noted) (see Figure 1)

t

w

t

su

t

h

TA = 25°C SN54ACT373 SN74ACT373
MIN MAX MIN MAX MIN MAX

Pulse duration, LE high 7 8.5 8 ns
Setup time, data before LE↓ 7 8.5 8 ns
Hold time, data after LE↓ 0 1 1 ns

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

SN54ACT373, SN74ACT373

PARAMETER

UNIT

D

Q

ns

LE

Q

ns

OE

Q

ns

OE

Q

ns

OCTAL D-TYPE TRANSPARENT LATCHES
WITH 3-STATE OUTPUTS

SCAS544D – OCTOBER 1995 – REVISED JANUARY 2000

switching characteristics over recommended operating free-air temperature range,
V

= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)

CC

FROM TO

(INPUT) (OUTPUT)

t

PLH

t

PHL

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

operating characteristics, VCC = 5 V, TA = 25°C

PARAMETER TEST CONDITIONS TYP UNIT

C

Power dissipation capacitance CL = 50 pF, f = 1 MHz 40 pF

pd

TA = 25°C SN54ACT373 SN74ACT373

MIN TYP MAX MIN MAX MIN MAX

2.5 8.5 10 1.5 12.5 1.5 11.5
2 8 10 1.5 12.5 1.5 11.5

2.5 8.5 11 1.5 12.5 2 11.5
2 8 10 1.5 11.5 1.5 11.5
2 8 9.5 1.5 11.5 1.5 10.5
2 7.5 9 1.5 11 1.5 10.5

2.5 9 11 1.5 14 2.5 12.5

1.5 7.5 8.5 1.5 11 1 10

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

From Output

Under Test

CL = 50 pF

(see Note A)

OCTAL D-TYPE TRANSPARENT LATCHES

SCAS544D – OCTOBER 1995 – REVISED JANUARY 2000

PARAMETER MEASUREMENT INFORMATION

2 × V

CC

Open

500 Ω

500 Ω

S1

SN54ACT373, SN74ACT373

WITH 3-STATE OUTPUTS

TEST S1

t

PLH/tPHL

t

PLZ/tPZL

t

PHZ/tPZH

Open

2 × V

Open

CC

LOAD CIRCUIT

t

w

Input

Input

Output

NOTES: A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.

1.5 V 1.5 V

VOLTAGE WAVEFORMS

1.5 V 1.5 V

t

PLH

50% V

VOLTAGE WAVEFORMS

CC

t

50% V

PHL

3 V

0 V

V

CC

V

3 V

0 V

OH

OL

Timing Input

Data Input

Output

Control

(low-level

enabling)

Output

Waveform 1

S1 at 2 × V

(see Note B)

Output

Waveform 2

S1 at Open

(see Note B)

CC

1.5 V

t

su

1.5 V 1.5 V

VOLTAGE WAVEFORMS

1.5 V 1.5 V

t

PZL

50% V

t

PZH

50% V

VOLTAGE WAVEFORMS

CC

CC

t

h

t

VOL + 0.3 V

t

VOH – 0.3 V

PLZ

PHZ

3 V

0 V

3 V

0 V

3 V

0 V

≈V

V

OL

V

OH

≈0 V

CC

Figure 1. Load Circuit and Voltage Waveforms

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

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Copyright  2000, Texas Instruments Incorporated