74VHCT374A Octal D-Type Flip-Flop with 3-STATE Outputs
May 2007
74VHCT374A
Octal D-Type Flip-Flop with 3-STATE Outputs
Features
■
High speed: f
MAX
=
140MHz (Typ.) at T
A
=
25°C
■
High noise immunity: V
IH
=
2.0V, V
IL
=
0.8V
■
Power down protection is provided on all inputs and
tm
General Description
The VHCT374A is an advanced high speed CMOS octal
flip-flop with 3-STATE output fabricated with silicon gate
CMOS technology. It achieves the high speed operation
similar to equivalent Bipolar Schottky TTL while main-
taining the CMOS low power dissipation. This 8-bit
D-type flip-flop is controlled by a clock input (CP) and an
output enable input (OE). When the OE input is HIGH,
the eight outputs are in a high impedance state.
Protection circuits ensure that 0V to 7V can be applied to
the input and output
(1)
pins without regard to the supply
voltage. This device can be used to interface 3V to 5V
systems and two supply systems such as battery back
up. This circuit prevents device destruction due to mis-
matched supply and input voltages.
Note:
1. Outputs in OFF-State.
outputs
■
Low power dissipation: I
CC
=
4µA (Max.) @ T
A
=
25°C
■
Pin and function compatible with 74HCT374
Ordering Information
Order Number
74VHCT374AM
74VHCT374ASJ
74VHCT374AMTC
Package
Number
M20B
M20D
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the
ordering number. Pb-Free package per JEDEC J-STD-020B.
Connection Diagram
Pin Description
Pin Names
D
0
–D
7
CP
OE
O
0
–O
7
Data Inputs
Clock Pulse Input 3-STATE
Output Enable Input 3-STATE
Outputs
Description
©1997 Fairchild Semiconductor Corporation
74VHCT374A Rev. 1.3
www.fairchildsemi.com
74VHCT374A Octal D-Type Flip-Flop with 3-STATE Outputs
Logic Symbol
IEEE/IEC
Functional Description
The VHCT374A consists of eight edge-triggered flip-
flops with individual D-type inputs and 3-STATE true out-
puts. The buffered clock and buffered Output Enable are
common to all flip-flops. The eight flip-flops will store the
state of their individual D inputs that meet the setup and
hold time requirements on the LOW-to-HIGH Clock (CP)
transition. With the Output Enable (OE) LOW, the con-
tents of the eight flip-flops are available at the outputs.
When the OE is HIGH, the outputs go to the high imped-
ance state. Operation of the OE input does not affect the
state of the flip-flops.
Truth Table
Inputs
D
n
H
L
X
X
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
=
LOW-to-HIGH Transition
CP
OE
L
L
H
Outputs
O
n
H
L
Z
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to
estimate propagation delays.
©1997 Fairchild Semiconductor Corporation
74VHCT374A Rev. 1.3
www.fairchildsemi.com
2
74VHCT374A Octal D-Type Flip-Flop with 3-STATE Outputs
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
V
CC
V
IN
V
OUT
Supply Voltage
DC Input Voltage
DC Output Voltage
Note 2
Note 3
I
IK
I
OK
I
OUT
I
CC
T
STG
T
L
Input Diode Current
Output Diode Current
(4)
DC Output Current
DC V
CC
/ GND Current
Storage Temperature
Parameter
Rating
–0.5V to +7.0V
–0.5V to +7.0V
–0.5V to V
CC
+ 0.5V
–0.5V to +7.0V
–20mA
±20mA
±25mA
±75mA
–65°C to +150°C
260°C
Lead Temperature (Soldering, 10 seconds)
Recommended Operating Conditions
(5)
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
V
IN
V
OUT
Supply Voltage
Input Voltage
Output Voltage
Note 2
Note 3
T
OPR
t
r
, t
f
Operating Temperature
Parameter
Rating
4.5V to +5.5V
0V to +5.5V
0V to V
CC
0V to 5.5V
–40°C to +85°C
0ns/V ~ 20ns/V
Input Rise and Fall Time, V
CC
=
5.0V ± 0.5V
Notes:
2. HIGH or LOW state. I
OUT
absolute maximum rating must be observed.
3. When outputs are in OFF-State or when V
CC
=
0V.
4. V
OUT
<
GND, V
OUT
>
V
CC
(Outputs Active).
5. Unused inputs must be held HIGH or LOW. They may not float.
©1997 Fairchild Semiconductor Corporation
74VHCT374A Rev. 1.3
www.fairchildsemi.com
3
74VHCT374A Octal D-Type Flip-Flop with 3-STATE Outputs
DC Electrical Characteristics
T
A
=
25°C
Symbol
V
IH
V
IL
V
OH
V
OL
I
OZ
I
IN
I
CC
I
CCT
I
OFF
T
A
=
–40°C
to +85°C
2.0
2.0
0.8
0.8
0.8
0.8
4.40
3.80
0.1
0.1
0.44
±2.5
±1.0
40.0
1.50
5.0
µA
µA
µA
mA
µA
V
V
V
V
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output
Voltage
LOW Level Output
Voltage
3-STATE Output
OFF-State Current
Input Leakage Current
Quiescent Supply
Current
Maximum I
CC
/Input
Output Leakage Current
(Power Down State)
V
CC
(V)
4.5
5.5
4.5
5.5
4.5
4.5
5.5
0–5.5
5.5
5.5
0.0
Conditions
Min. Typ. Max. Min. Max. Units
2.0
2.0
V
IN
=
V
IH
I
OH
=
–50µA
or V
IL
I
OH
=
–8mA
V
IN
=
V
IH
I
OL
=
+50µA
or V
IL
I
OL
=
+8mA
V
IN
=
V
IH
or V
IL
,
V
OUT
=
V
CC
or GND
V
IN
=
5.5V or GND
V
IN
=
V
CC
or GND
V
IN
=
3.4V, Other
Inputs
=
V
CC
or GND
V
OUT
=
5.5V
4.40
3.94
4.50
0.0
0.36
±0.25
±0.1
4.0
1.35
0.5
Noise Characteristics
T
A
=
25°C
Symbol
V
OLP(6)
V
OLV(6)
V
IHD(6)
V
ILD(6)
Parameter
Quiet Output Maximum
Dynamic V
OL
Quiet Output Minimum
Dynamic V
OL
Minimum HIGH Level Dynamic
Input Voltage
Maximum LOW Level Dynamic
Input Voltage
V
CC
(V)
5.0
5.0
5.0
5.0
Conditions
C
L
=
50pF
C
L
=
50pF
C
L
=
50pF
C
L
=
50pF
Typ.
1.2
–1.2
Limits
1.6
–1.6
2.0
0.8
Units
V
V
V
V
Note:
6. Parameter guaranteed by design.
©1997 Fairchild Semiconductor Corporation
74VHCT374A Rev. 1.3
www.fairchildsemi.com
4
74VHCT374A Octal D-Type Flip-Flop with 3-STATE Outputs
AC Electrical Characteristics
T
A
=
25°C
Symbol
t
PLH
, t
PHL
t
PZL
, t
PZH
t
PLZ
, t
PHZ
T
A
=
–40°C
to +85°C
Units
ns
ns
ns
ns
MHz
10
pF
pF
pF
9.4
1.0
1.0
1.0
1.0
1.0
10.5
11.5
11.5
12.5
12.0
1.0
80
75
10
Parameter
Propagation Delay
Time
3-STATE Output
Enable Time
3-STATE Output
Disable Time
V
CC
(V)
5.0 ± 0.5
5.0 ± 0.5
5.0 ± 0.5
Conditions
C
L
=
15pF
C
L
=
50pF
R
L
=
1kΩ C
L
=
15pF
C
L
=
50pF
R
L
=
1kΩ C
L
=
50pF
Min. Typ. Max. Min. Max.
4.1
5.6
6.5
7.3
7.0
10.4
10.2
11.2
11.2
1.0
t
OSLH
, t
OSHL
Output to Output
Skew
f
MAX
C
IN
C
OUT
C
PD
Maximum Clock
Frequency
Input Capacitance
Output Capacitance
Power Dissipation
Capacitance
5.0 ± 0.5
(7)
5.0 ± 0.5
C
L
=
15pF
C
L
=
50pF
V
CC
=
Open
V
CC
=
5.0V
(8)
90
85
140
130
4
9
25
Notes:
7. Parameter guaranteed by design. t
OSLH
=
|t
PLH max
– t
PLH min
|; t
OSHL
=
|t
PHL max
– t
PHL min
|
8. C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load. Average operating current can be obtained by the equation:
I
CC
(Opr.)
=
C
PD
• V
CC
• f
IN
+ I
CC
/ 8 (per F/F). The total C
PD
when n pcs. of the octal D Flip-Flop operates
can be calculated by the equation: C
PD
(total)
=
20 + 12m
AC Operating Requirements
T
A
=
25°C
Symbol
t
S
t
H
T
A
=
–40°C to +85°C
Min.
8.5
2.5
2.5
Parameter
Minimum Set-up Time
Minimum Hold Time
V
CC
(V)
5.0 ± 0.5
5.0 ± 0.5
5.0 ± 0.5
Min.
6.5
2.5
2.5
Typ.
Max.
Max.
Units
ns
ns
ns
t
W
(H), t
W
(L) Minimum Pulse Width (CP)
©1997 Fairchild Semiconductor Corporation
74VHCT374A Rev. 1.3
www.fairchildsemi.com
5
无线连接
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
