Texas Instruments SN74BCT373DBLE, SN74BCT373DBR, SN74BCT373DW, SN74BCT373DWR, SN74BCT373N Datasheet

SN54BCT373, SN74BCT373

OCTAL TRANSPARENT D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS016C – SEPTEMBER 1988 – REVISED NOVEMBER 1993

Copyright  1993, Texas Instruments Incorporated

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• State-of-the-Art BiCMOS Design

Significantly Reduces Standby Current

• Full Parallel Access for Loading

• 3-State True Outputs Drive Bus Lines

or Buffer Memory Address Registers

• ESD Protection Exceeds 2000 V

Per MIL-Std-883C, Method 3015

• Package Options Include Plastic

Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(J, N)

description

These 8-bit latches feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.

The eight latches of the ′BCT373 are transparent
D-type latches. While the latch-enable (LE) input
is high, the Q outputs will follow the data (D) inputs.
When the latch enable is taken low, the Q outputs
will be latched at the logic levels that were 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 a 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 without need for interface or pullup components.

The output enable (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 SN74BCT373 is available in TI’s shrink small-outline package (DB), which provides the same I/O pin count
and functionality of standard small-outline packages in less than half the printed-circuit-board area.

The SN54BCT373 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74BCT373 is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

(each latch)

INPUTS

OUTPUT

OE LE D

Q

L H H H
L HL L
L LX Q

0

H X X Z

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

OE

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

GND

V

CC

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

SN54BCT373 ...J OR W PACKAGE

SN74BCT373 . . . DB, DW, OR N PACKAGE

(TOP VIEW)

3 2 1 20 19

910111213

4
5
6
7
8

18
17
16
15
14

8D
7D
7Q
6Q
6D

2D
2Q
3Q
3D
4D

1D1QOE

5Q

5D

8Q

4Q

GND

LE

V

CC

SN54BCT373 . . . FK PACKAGE

(TOP VIEW)

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.

SN54BCT373, SN74BCT373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS

SCBS016C – SEPTEMBER 1988 – REVISED NOVEMBER 1993

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

logic diagram (positive logic)

OE

1D

3

1D

4

2D

7

3D

8

4D

13

5D

C1

11

LE

1Q

2

2Q

5

3Q

6

4Q

9

5Q

12

6Q

15

7Q

16

8Q

19

14

6D

17

7D

18

8D

EN

1

OE

LE

1D

1Q

1

11

3

2

To Seven Other Channels

C1
1D

†

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, V

CC

– 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI (see Note 1) – 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state, V

O

– 0.5 V to 5.5 V. . . . . . . . . . . . . . .

Voltage range applied to any output in the high state, V

O

– 0.5 V to V

CC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current into any output in the low state: SN54BCT373 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT373 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power dissipation (DB package only) (see Note 2) 650 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54BCT373 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT373 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range – 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. Power dissipation is application dependent and is a function of supply voltage, operating temperature, the number of outputs
switching simultaneously , and output duty cycle. Because the thermal resistance of the DB package is higher than that of the DW
or N packages, the DB package may not be suitable for some applications.

recommended operating conditions

SN54BCT373 SN74BCT373

MIN NOM MAX MIN NOM MAX

UNIT

V

CC

Supply voltage 4.5 5 5.5 4.5 5 5.5 V

V

IH

High-level input voltage 2 2 V

V

IL

Low-level input voltage 0.8 0.8 V

I

IK

Input clamp current –18 –18 mA

I

OH

High-level output current –12 –15 mA

I

OL

Low-level output current 48 64 mA

T

A

Operating free-air temperature –55 125 0 70 °C

SN54BCT373, SN74BCT373

OCTAL TRANSPARENT D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS016C – SEPTEMBER 1988 – REVISED NOVEMBER 1993

2–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

SN54BCT373 SN74BCT373

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

V

IK

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

IOH = –3 mA 2.4 3.3 2.4 3.3

V

OH

VCC = 4.5 V

IOH = –12 mA 2 3.2

V
IOH = –15 mA 2 3.1
IOL = 48 mA 0.38 0.55

V

OL

V

CC

= 4.5

V

IOL = 64 mA 0.42 0.55

V

I

I

VCC = 5.5 V, VI = 5.5 V 0.4 0.4 mA

I

IH

VCC = 5.5 V, VI = 2.7 V 20 20 µA

I

IL

VCC = 5.5 V, VI = 0.5 V –0.6 –0.6 mA

I

OS

‡

VCC = 5.5 V, VO = 0 –100 –225 –100 –225 mA

I

OZH

VCC = 5.5 V, VO = 2.7 V 50 50 µA

I

OZL

VCC = 5.5 V, VO = 0.5 V –50 –50 µA

I

CCL

VCC = 5.5 V 37 60 37 60 mA

I

CCH

VCC = 5.5 V 2 5 2 5 mA

I

CCZ

VCC = 5.5 V 5 8 5 8 mA

C

i

VCC = 5 V, VI = 2.5 V or 0.5 V 6 6 pF

C

o

VCC = 5 V, VO = 2.5 V or 0.5 V 11 11 pF

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

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

timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)

VCC = 5 V,

TA = 25°C

SN54BCT373 SN74BCT373

UNIT

MIN MAX MIN MAX MIN MAX

t

w

Pulse duration, LE high 7.5 7.5 7.5 ns

t

su

Setup time, data before LE↓ 2 2 2 ns

t

h

Hold time, data after LE↓ 5.5 5.5 5.5 ns