Texas Instruments SN74BCT374N, SN74BCT374DBLE, SN74BCT374DBR, SN74BCT374DW, SN74BCT374DWR Datasheet
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SN54BCT374, SN74BCT374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CC
• Full Parallel Access for Loading
• Buffered Control Inputs
• 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 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 ′BCT374 are
edge-triggered D-type flip-flops. On the positive
transition of the clock (CLK) input, the Q outputs
are set to the logic levels that were set up at the
data (D) inputs.
SN54BCT374 ...J OR W PACKAGE
SN74BCT374 . . . DB OR DW OR N PACKAGE
SN54BCT374 . . . FK PACKAGE
2D
2Q
3Q
3D
4D
(TOP VIEW)
OE
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
(TOP VIEW)
1D1QOE
3 2 1 20 19
4
5
6
7
8
9 10 11 12 13
4Q
1
2
3
4
5
6
7
8
9
10
GND
20
19
18
17
16
15
14
13
12
11
V
CLK
CC
5Q
V
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
8Q
18
17
16
15
14
5D
CC
8D
7D
7Q
6Q
6D
A buffered output-enable (OE
) input can be used to place the eight outputs in either a normal logic state (high
or low) 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 the increased drive provide the capability to drive bus lines without
need for interface or pullup components. The output-enable (OE) input does not affect internal operations of
the flip-flop. Old data can be retained or new data can be entered while the outputs are in the high-impedance
state.
The SN54BCT374 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74BCT374 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each flip-flop)
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.
INPUTS
OE CLK D
L ↑ H H
L ↑ LL
L H or L X Q
H X X Z
OUTPUT
Q
0
Copyright 1994, Texas Instruments Incorporated
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2–1
SN54BCT374, SN74BCT374
UNIT
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994
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
CLK
3
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
1D
To Seven Other Channels
1D
C1
2
1Q
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.
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 –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state: SN54BCT374 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT374 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54BCT374 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74BCT374 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 voltage ratings may be exceeded if the input and output 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
SN54BCT374 SN74BCT374
MIN NOM MAX MIN NOM MAX
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