Texas Instruments SN74BCT573DW, SN74BCT573DWR, SN74BCT573N, SNJ54BCT573FK, SNJ54BCT573J Datasheet
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SN54BCT573, SN74BCT573
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS071A – AUGUST 1990 – REVISED NOVEMBER 1993
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CCZ
• ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)
• Full Parallel Access for Loading
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
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 ′BCT573 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.
SN54BCT573 ...J OR W PACKAGE
SN74BCT573 . . . DW OR N PACKAGE
SN54BCT573 . . . FK PACKAGE
3D
4D
5D
6D
7D
(TOP VIEW)
OE
1
1D
2
2D
3
3D
4
4D
5
5D
6
6D
7
7D
8
8D
9
GND
10
(TOP VIEW)
2D1DOE
3 2 1 20 19
4
5
6
7
8
910111213
20
19
18
17
16
15
14
13
12
11
V
CC
V
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
LE
1Q
18
17
16
15
14
CC
2Q
3Q
4Q
5Q
6Q
A buffered output-enable (OE
to place the eight outputs in either a normal logic
) input can be used
8D
GND
LE
8Q
7Q
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 SN54BCT573 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74BCT573 is characterized for operation from 0°C to 70°C.
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
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
Copyright 1993, Texas Instruments Incorporated
2–1
SN54BCT573, SN74BCT573
UNIT
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCBS071A – AUGUST 1990 – REVISED NOVEMBER 1993
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.
†
1
11
2
3
4
5
6
7
8
9
EN
C1
1D
19
18
17
16
15
14
13
12
logic diagram (positive logic)
1
OE
11
LE
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
1D
2
To Seven Other Channels
C1
1D
19
1Q
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
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
Voltage range applied to any output in the high state, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
O
Input clamp current, IIK (VI < 0) –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state, IO: SN54BCT573 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT573 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54BCT573 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT573 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.
NOTE 1: The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
– 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
– 0.5 V to 5.5 V. . . . . . . . . . . . . . .
– 0.5 V to V
‡
CC
recommended operating conditions
V
V
V
I
IK
I
OH
I
OL
T
2–2
CC
IH
IL
A
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
Input clamp current –18 –18 mA
High-level output current –12 –15 mA
Low-level output current 48 64 mA
Operating free-air temperature –55 125 0 70 °C
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT573 SN74BCT573
MIN NOM MAX MIN NOM MAX
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