74AC378LCQB [NSC]
Parallel D Register with Enable; 并行D寄存器使能
| 型号： | 74AC378LCQB |
| 厂家： | 
National Semiconductor |
| 描述： | Parallel D Register with Enable |
| 文件： | 总8页 (文件大小：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 1993
54AC/74AC378
Parallel D Register with Enable
General Description
The ’AC378 is a 6-bit register with a buffered common En-
able. This device is similar to the ’AC174, but with common
Enable rather than common Master Reset.
Features
Y
Y
Y
Y
Y
6-bit high-speed parallel register
Positive edge-triggered D-type inputs
Fully buffered common clock and enable inputs
Input clamp diodes limit high-speed termination effects
Standard Military Drawing (SMD)
Ð ’AC378: 5962-91605
Logic Symbols
Connection Diagrams
Pin Assignment for
DIP, SOIC and Flatpak
Pin Assignment
for LCC
TL/F/10231–1
TL/F/10231–3
IEEE/IEC
TL/F/10231–2
TL/F/10231–4
Pin Names
Description
E
Enable Input (Active LOW)
Data Inputs
D –D
0
5
CP
Clock Pulse Input (Active Rising Edge)
Outputs
Q –Q
0
5
FACTTM is a trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/10231
RRD-B30M75/Printed in U. S. A.
Functional Description
Truth Table
The ’AC378 consists of six edge-triggered D-type flip-flops
with individual D inputs and Q inputs. The Clock (CP) and
Enable (E) inputs are common to all flip-flops.
Inputs
Output
E
CP
D
Q
n
n
When the E input is LOW, new data is entered into the
register on the LOW-to-HIGH transition of the CP input.
When the E input is HIGH the register will retain the present
data independent of the CP input.
H
L
L
L
L
L
X
No Change
H
L
H
L
e
e
e
H
L
HIGH Voltage Level
LOW Voltage Level
Immaterial
X
e
L
LOW-to-HIGH Clock Transition
Logic Diagram
TL/F/10231–5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Recommended Operating
Conditions
Supply Voltage (V
’AC
)
CC
2.0V to 6.0V
b
a
0.5V to 7.0V
Supply Voltage (V
)
CC
Input Voltage (V )
I
0V to V
0V to V
CC
DC Input Diode Current (I
)
IK
Output Voltage (V
)
O
CC
e b
b
a
V
I
V
I
0.5V
a
20 mA
20 mA
Operating Temperature (T )
A
e
V
CC
0.5V
b
b
a
40 C to 85 C
74AC
54AC
§
55 C to 125 C
§
§
b
b
a
0.5V
DC Input Voltage (V )
I
0.5V to V
0.5V to V
CC
a
§
DC Output Diode Current (I
)
OK
Minimum Input Edge Rate (DV/Dt)
’AC Devices
e b
b
a
V
V
0.5V
a
20 mA
20 mA
O
O
e
V
CC
0.5V
V
V
from 30% to 70% of V
@
IN
CC
a
DC Output Voltage (V
DC Output Source
)
O
0.5V
50 mA
50 mA
CC
3.3V, 4.5V, 5.5V
125 mV/ns
CC
g
g
or Sink Current (I
)
O
DC V
or Ground Current
CC
per Output Pin (I or I
CC
)
GND
)
b
a
65 C to 150 C
Storage Temperature (T
§
§
STG
Junction Temperature (T )
J
CDIP
PDIP
175 C
§
140 C
§
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom-
mend operation of FACTTM circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
74AC
54AC
74AC
e
a
e
T
A
V
CC
(V)
T
A
55 C to 125 C
e a
Symbol
Parameter
T
25 C
§
Units
Conditions
A
b
b a
40 C to 85 C
§
§
Guaranteed Limits
§
§
Typ
e
0.1V
V
V
V
Minimum High Level
Input Voltage
3.0
4.5
5.5
1.5
2.1
2.1
2.1
V
IH
OUT
b
2.25
2.75
3.15
3.85
3.15
3.85
3.15
3.85
V
V
V
or V
CC
0.1V
e
Maximum Low Level
Input Voltage
3.0
4.5
5.5
1.5
0.9
0.9
0.9
V
OUT
0.1V
IL
b
2.25
2.75
1.35
1.65
1.35
1.65
1.35
1.65
or V
CC
0.1V
e b
OUT
Minimum High Level
Output Voltage
3.0
4.5
5.5
2.99
4.49
5.49
2.9
4.4
5.4
2.9
4.4
5.4
2.9
4.4
5.4
I
50 mA
OH
e
*V
IN
V
or V
IH
12 mA
IL
b
b
b
3.0
4.5
5.5
2.56
3.86
4.86
2.4
3.7
4.7
2.46
3.76
4.76
V
V
I
24 mA
24 mA
OH
e
e
V
OL
Maximum Low Level
Output Voltage
3.0
4.5
5.5
0.002
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
I
50 mA
OUT
*V
IN
V or V
IL IH
3.0
4.5
5.5
0.36
0.36
0.36
0.5
0.5
0.5
0.44
0.44
0.44
12 mA
V
I
24 mA
24 mA
OL
e
I
Maximum Input
Leakage Current
V
I
V , GND
CC
IN
g
g
g
1.0
5.5
0.1
1.0
mA
*All outputs loaded; thresholds on input associated with output under test.
3
DC Characteristics for ’AC Family Devices (Continued)
74AC
54AC
74AC
e
25 C
§
e
a
e
T
A
V
CC
(V)
T
a
T
A
A
55 C to 125 C
Symbol
Parameter
Units
Conditions
b
b a
40 C to 85 C
§
§
Guaranteed Limits
§
§
Typ
e
²
I
I
I
Minimum Dynamic
5.5
5.5
50
75
mA
mA
V
V
V
1.65V Max
OLD
OHD
CC
OLD
Output Current
b
b
e
3.85V Min
OHD
50
75
e
Maximum Quiescent
Supply Current
V
CC
IN
5.5
4.0
80.0
40.0
mA
or GND
²
Maximum test duration 2.0 ms, one output loaded at a time.
@
@
3.0V are guaranteed to be less than or equal to the respective limit 5.5V V
Note: I and I
IN
.
CC
CC
@ @
for 54AC 25 C is identical to 74AC 25 C.
§ §
I
CC
AC Electrical Characteristics
74AC
54AC
e b
74AC
e b
T
55 C
T
A
40 C
§
§
A
e a
A
V
CC
(V)
*
T
25 C
§
50 pF
a
a
Symbol
Parameter
to 125 C
to 85 C
Units
§
50 pF
§
50 pF
e
C
L
e
e
C
C
L
L
Min
Typ
Max
Min
Max
Min
Max
f
t
t
Maximum Clock
Frequency
3.3
5.0
125
160
160
200
95
95
110
145
max
PLH
PHL
MHz
ns
Propagation Delay
3.3
5.0
2.5
1.5
8.5
6.0
11.0
8.0
1.5
1.5
12.0
9.0
2.5
1.5
12.5
9.0
CP to Q
n
Propagation Delay
CP to Q
3.3
5.0
2.5
1.5
8.0
5.5
10.5
7.5
1.5
1.5
12.0
9.0
2.5
1.5
11.0
8.0
ns
n
g
*Voltage Range 3.3 is 3.3V 0.3V
g
Voltage Range 5.0 is 5.0V 0.5V
AC Operating Requirements
74AC
54AC
74AC
e b
e b
A
a
T
55 C
T
40 C
§
to 125 C
§
to 85 C
A
e a
A
V *
CC
(V)
T
25 C
§
50 pF
a
Symbol
Parameter
Units
§
50 pF
§
e
C
L
e
e
50 pF
C
C
L
L
Typ
Guaranteed Minimum
t
t
t
t
t
Setup Time, HIGH or LOW
3.3
5.0
1.5
1.0
3.0
4.0
4.0
3.5
s
ns
ns
ns
ns
ns
D
to CP
2.0
2.5
n
Hold Time, HIGH or LOW
to CP
3.3
5.0
1.0
1.0
2.0
2.0
4.0
4.0
2.0
2.0
h
s
D
n
Setup Time, HIGH or
LOW, E to CP
3.3
5.0
0
0
2.0
2.0
2.5
2.5
2.0
2.0
Hold Time, HIGH or
LOW, E to CP
3.3
5.0
1.0
1.0
2.0
2.0
4.0
4.0
2.0
2.0
h
w
CP Pulse Width
HIGH or LOW
3.3
5.0
3.0
2.0
4.5
3.5
6.5
6.5
5.5
4.0
g
*Voltage Range 3.3 is 3.3V 0.3V
g
Voltage Range 5.0 is 5.0V 0.5V
Capacitance
Symbol
Parameter
Input Capacitance
Power Dissipation Capacitance
Typ
4.5
28
Units
pF
Conditions
e
OPEN
C
C
V
CC
IN
e
5.0V
pF
V
CC
PD
4
Ordering Information
The device number is used to form part of a simplified purchasing code where a package type and temperature range are
defined as follows:
74AC 378
P
C
QR
Temperature Range Family
e
Special Variations
e
e
74AC Commercial
X
QR
Devices shipped in 13 reels
×
Commercial grade device with
burn-in
e
54AC Military
Device Type
Package Code
e
QB
Military grade with environmental
and burn-in processing shipped
in tubes
e
e
e
e
e
P
D
F
L
Plastic DIP
Ceramic DIP
Flatpak
Leadless Ceramic Chip Carrier (LCC)
Small Outline (SOIC)
Temperature Range
e
e
b a
C
M
Commercial ( 40 C to 85 C)
§
§
b a
Military ( 55 C to 125 C)
§
§
S
5
Physical Dimensions inches (millimeters)
20-Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J16A
6
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Integrated Circuit (S)
NS Package Number M16A
16-Lead Plastic Dual-In-Line Package (P)
NS Package Number N16E
7
Ý
Lit. 114805
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flatpak (F)
NS Package Number W16A
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failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
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