54AC378.pdf
(
128 KB
)
Pobierz
September 1998
54AC378
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
n
6-bit high-speed parallel register
n
Positive edge-triggered D-type inputs
n
Fully buffered common clock and enable inputs
n
Input clamp diodes limit high-speed termination effects
n
Standard Microcircuit Drawing (SMD) 5962-9160501
Logic Symbols
Pin Descriptions
Pin
Names
Description
E
Enable Input (Active LOW)
D
0
–D
5
Data Inputs
CP
Clock Pulse Input (Active Rising Edge)
Q
0
–Q
5
Outputs
Connection Diagrams
Pin Assignment for
DIP and CERPACK
DS100358-1
IEEE/IEC
DS100358-2
DS100358-4
Pin Assignment for
LCC
DS100358-3
FACT
™
is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100358
www.national.com
Functional Description
The AC378 consists of six edge-triggered D-type flip-flops
with indi
vi
dual D inputs and Q inputs. The Clock (CP) and
Enable (E
)
inputs are common to all flip-flops.
When the E input is LOW, new data is entered into the reg-
ister
o
n 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.
Truth Table
Inputs
Output
E
CP
D
n
Q
n
H
N
X
No Change
L
N
H
H
L
N
L
L
H = HIGH Voltage Level
L =LOW Voltage Level
X = Immaterial
N = LOW-to-HIGH Clock Transition
Logic Diagram
DS100358-5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.national.com
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.
Supply Voltage (V
CC
)
CDIP
175˚C
Recommended Operating
Conditions
Supply Voltage (V
CC
)
AC
−0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=
−0.5V
2.0V to 6.0V
−20 mA
Input Voltage (V
I
)
0VtoV
CC
V
I
=
V
CC
+ 0.5V
+20 mA
Output Voltage (V
O
)
0VtoV
CC
DC Input Voltage (V
I
)
−0.5V to V
CC
+ 0.5V
Operating Temperature (T
A
)
−55˚C to +125˚C
DC Output Diode Current (I
OK
)
V
O
=
−0.5V
Minimum Input Edge Rate (
D
V/
D
t)
−20 mA
AC Devices
V
IN
from 30% to 70% of V
CC
V
CC
@
3.3V, 4.5V, 5.5V 125 mV/ns
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. Fairchild does not recom-
mend operation of FACT
™
circuits outside databook specifications.
V
O
=
V
CC
+ 0.5V
+20 mA
DC Output Voltage (V
O
)
−0.5V to V
CC
+ 0.5V
DC Output Source
or Sink Current (I
O
)
±
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
±
50 mA
Storage Temperature (T
STG
)
−65˚C to +150˚C
Junction Temperature (T
J
)
DC Characteristics for AC Family Devices
Symbol
T
A
=
−55˚C to +125˚C
Parameter
V
CC
Units
Conditions
(V)
Guaranteed Limits
V
OUT
=
0.1V
V
IH
Minimum High Level
3.0
2.1
Input Voltage
4.5
3.15
V
or V
CC
− 0.1V
5.5
3.85
V
IL
Maximum Low Level
3.0
0.9
V
OUT
= 0.1V
Input Voltage
4.5
1.35
V
or V
CC
− 0.1V
5.5
1.65
V
OH
Minimum High Level
3.0
2.9
I
OUT
= −50 µA
Output Voltage
4.5
4.4
V
5.5
5.4
V
IN
= V
IL
or V
IH
3.0
2.4
I
OH
= −12 mA
4.5
3.7
V
I
OH
= −24 mA
I
OH
=
−24 mA
5.5
4.7
(Note 2)
V
OL
Maximum Low Level
3.0
0.1
I
OUT
= 50 µA
Output Voltage
4.5
0.1
V
5.5
0.1
V
IN
= V
IL
or V
IH
3.0
0.4
I
OL
= 12 mA
4.5
0.5
V
I
OL
= 24 mA
I
OL
=
24 mA
5.5
0.5
V
I
=
V
CC
, GND
I
IN
Maximum Input Leakage
Current
±
1.0
5.5
µA
V
OLD
=
1.65V Max
I
OLD
Minimum Dynamic
5.5
50
mA
V
OHD
=
3.85V Min
I
OHD
Output Current
(Note 3)
5.5
−50
mA
V
IN
=
V
CC
or GND
I
CC
Maximum Quiescent
Supply Current
5.5
80.0
µA
Note 2:
All outputs loaded; thresholds on input associated with output under test.
Note 3:
Maximum test duration 2.0 ms, one output loaded at a time.
3
www.national.com
AC Electrical Characteristics
Symbol
T
A
=
−55˚C to +125˚C
Parameter
V
CC
Units
C
L
=
50 pF
(V)
(Note 4)
Min
Max
f
max
Maximum Clock
3.3
95
MHz
Frequency
5.0
95
t
PLH
Propagation Delay
3.3
1.5
12.0
ns
CP to Q
n
5.0
1.5
9.0
t
PHL
Propagation Delay
3.3
1.5
12.0
ns
CP to Q
n
5.0
1.5
9.0
Note 4:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
AC Operating Requirements
Symbol
T
A
=
−55˚C to +125˚C
Parameter
V
CC
Units
(V)
C
L
= 50 pF
(Note 5)
Guaranteed Minimum
t
s
Setup Time, HIGH or LOW
3.3
4.0
ns
D
n
to CP
5.0
4.0
t
h
Hold Time, HIGH or LOW
3.3
4.0
ns
D
n
to CP
5.0
4.0
t
s
Setup
T
ime, HIGH or
3.3
2.5
ns
LOW,EtoCP
5.0
2.5
t
h
Hold T
im
e, HIGH or
3.3
4.0
ns
LOW,EtoCP
5.0
4.0
t
w
CP Pulse Width
3.3
6.5
ns
HIGH or LOW
5.0
6.5
Note 5:
Voltage Range 3.3 is 3.3V
±
0.3V
Voltage Range 5.0 is 5.0V
±
0.5V
Capacitance
Symbol
Parameter
Typ
Units
Conditions
V
CC
=
OPEN
C
IN
Input Capacitance
4.5
pF
V
CC
=
5.0V
C
PD
Power Dissipation Capacitance
28
pF
www.national.com
4
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Ceramic Dual-in-line
Package Number J16A
16-Lead CERPACK
Package Number W16A
5
www.national.com
Plik z chomika:
kojczuch
Inne pliki z tego folderu:
ADC10461.pdf
(333 KB)
ADC10462.pdf
(333 KB)
100301.pdf
(105 KB)
100302.pdf
(106 KB)
100304.pdf
(109 KB)
Inne foldery tego chomika:
ADC
ANALOG
AUDIO
Bt
CCD
Zgłoś jeśli
naruszono regulamin