SN74BCT374N [TI]
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS; 八路边沿触发D型触发器具有三态输出
| 型号： | SN74BCT374N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH 3-STATE OUTPUTS |
| 文件： | 总5页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54BCT374, SN74BCT374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994
SN54BCT374 . . . J OR W PACKAGE
SN74BCT374 . . . DB OR DW OR N PACKAGE
(TOP VIEW)
• State-of-the-Art BiCMOS Design
Significantly Reduces I
CC
• Full Parallel Access for Loading
• Buffered Control Inputs
OE
1Q
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
8Q
8D
7D
7Q
6Q
6D
• 3-State True Outputs Drive Bus Lines
1D
2D
or Buffer Memory Address Registers
• ESD Protection Exceeds 2000 V
2Q
3Q
3D
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)
4D
4Q
13 5D
12 5Q
11
GND
CLK
SN54BCT374 . . . FK PACKAGE
(TOP VIEW)
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.
3
2
1
20 19
18
2D
2Q
3Q
3D
4D
8D
7D
7Q
6Q
4
5
6
7
8
17
16
15
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.
14 6D
9 10 11 12 13
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)
INPUTS
OUTPUT
Q
OE
L
CLK
D
H
L
↑
↑
H
L
L
L
H or L
X
X
X
Q
0
H
Z
Copyright 1994, 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.
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT374, SN74BCT374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994
†
logic symbol
logic diagram (positive logic)
1
1
OE
OE
EN
C1
11
11
CLK
CLK
C1
1D
2
1Q
3
3
1D
4
2
5
1D
1D
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
2D
7
6
3D
8
9
4D
13
12
15
16
19
5D
14
To Seven Other Channels
6D
17
7D
18
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
I
Voltage range applied to any output in the disabled or power-off state, V . . . . . . . . . . . . . . . – 0.5 V to 5.5 V
O
Voltage range applied to any output in the high state, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to V
O
CC
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.
recommended operating conditions
SN54BCT374
MIN NOM MAX
SN74BCT374
UNIT
MIN NOM
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
High-level input voltage
Low-level input voltage
Input clamp current
0.8
–18
–12
48
0.8
–18
–15
64
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
Operating free-air temperature
OH
OL
T
A
–55
125
0
70
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT374, SN74BCT374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54BCT374
SN74BCT374
PARAMETER
TEST CONDITIONS
UNIT
†
†
MIN TYP
MAX
MIN TYP
MAX
V
V
V
= 4.5 V,
= 4.5 V
I = –18 mA
–1.2
–1.2
V
IK
CC
I
I
I
I
I
I
= –3 mA
= –12 mA
= –15 mA
= 48 mA
= 64 mA
2.4
2
3.3
3.2
2.4
2
3.3
3.1
OH
OH
OH
OL
OL
V
OH
V
CC
0.38
0.55
V
OL
V
CC
= 4.5 V
V
0.42
0.55
0.4
20
I
I
I
I
I
I
I
I
I
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V
= 5.5 V
= 5.5 V
= 5 V,
V = 5.5 V
I
0.4
20
mA
µA
I
V = 2.7 V
I
IH
IL
V = 0.5 V
I
–0.6
–225
50
–0.6
–225
50
mA
mA
µA
‡
V
O
V
O
V
O
= 0
–100
–100
OS
= 2.7 V
= 0.5 V
OZH
OZL
CCL
CCH
CCZ
–50
60
–50
60
µA
37
2
37
2
mA
mA
mA
pF
5
5
5
8
5
8
C
C
V = 2.5 V or 0.5 V
I
6
6
i
= 5 V,
V
O
= 2.5 V or 0.5 V
10
10
pF
o
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
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)
V
T
= 5 V,
= 25°C
CC
A
SN54BCT374 SN74BCT374
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
f
t
t
t
Clock frequency
70
70
70
MHz
ns
clock
Pulse duration
CLK high
7
6.5
0
8
6.5
0
7
6.5
0
w
Data high or low
Data high or low
ns
Setup time before CLK↑
Hold time after CLK↑
su
h
ns
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54BCT374, SN74BCT374
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS019B – SEPTEMBER 1988 – REVISED APRIL 1994
switching characteristics (see Note 2)
V
C
= 5 V,
= 50 pF,
V
= 4.5 V to 5.5 V,
C = 50 pF,
L
CC
L
CC
R1 = 500 Ω,
R2 = 500 Ω,
T
A
R1 = 500 Ω,
R2 = 500 Ω,
†
T = MIN to MAX
A
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
= 25°C
′BCT374
SN54BCT374 SN74BCT374
MIN
70
2
TYP
MAX
MIN
70
2
MAX
MIN
70
2
MAX
f
t
t
t
t
t
t
MHz
ns
max
PLH
PHL
PZH
PZL
PHZ
PLZ
7.2
7.1
8.3
8.6
4.7
4.8
9.1
8.8
11.6
10.6
12.7
13
10.6
10
CLK
Q
Q
Q
2
2
2
1
10.1
10.6
6.3
1
1
12.3
12.7
6.8
ns
ns
OE
OE
1
1
1
1
1
7.1
1
1
6.3
1
7.5
1
6.8
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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Copyright 1998, Texas Instruments Incorporated
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