Texas Instruments SN74BCT574DBR, SN74BCT574DW, SN74BCT574DWR, SN74BCT574N, SNJ54BCT574FK Datasheet
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SN54BCT574, SN74BCT574
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS074B – SEPTEMBER 1991 – 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 flip-flops 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 flip-flops of the ′BCT574 are
edge-triggered D-type flip-flops. On the positive
transition of the clock (CLK) input, the Q outputs
will be set to the logic levels that were set up at the
data (D) inputs.
SN54BCT574 ...J OR W PACKAGE
SN74BCT574 . . . DW OR N PACKAGE
SN54BCT574 . . . FK PACKAGE
3D
4D
5D
6D
7D
(TOP VIEW)
1
OE
2
1D
3
2D
4
3D
5
4D
6
5D
7
6D
8
7D
9
8D
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
CLK
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
CLK
8Q
7Q
state (high or low logic levels) or a highimpedance 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 flip-flops. Old data can be retained or new
data can be entered while the outputs are in the high-impedance state.
The SN54BCT574 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74BCT574 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OE CLK D
L ↑ H H
L ↑ LL
L H or L X 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
SN54BCT574, SN74BCT574
UNIT
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS074B – SEPTEMBER 1991 – REVISED NOVEMBER 1993
logic symbol
OE
CLK
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
1D
C1
19
18
17
16
15
14
13
12
logic diagram (positive logic)
1
OE
11
CLK
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
1D
2
To Seven Other Channels
1D
C1
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, I
: SN54BCT574 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
SN74BCT574 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54BCT574 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT574 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
SN54BCT574 SN74BCT574
MIN NOM MAX MIN NOM MAX
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