1999 Fairchild Semiconductor Corporation
DS009595
www.fairchildsemi.com
April 1988
Revised August 1999
7
4F821 10-Bi
t D-T
ype Fli
p
-F
lop
74F821
10-Bit D-Type Flip-Flop
General Description
The 74F821 is a 10-bit D-type flip-flop with 3-STATE true
outputs arranged in a broadside pinout.
Features
s
3-STATE Outputs
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Order Number
Package Number
Package Description
74F821SC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F821SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide
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2
74F821
Unit Loading/Fan Out
Functional Description
The 74F821 consists of ten D-type edge-triggered flip-
flops. This device has 3-STATE true outputs for bus sys-
tems organized in a broadside pinning. The buffered Clock
(CP) and buffered Output Enable (OE) are common to all
flip-flops. The flip-flops will store the state of their individual
D inputs that meet the setup and hold times requirements
on the LOW-to-HIGH CP transition. With the OE LOW the
content of the flip-flops are available at the outputs. When
the OE is HIGH, the outputs go to the high impedance
state. Operation of the OE input does not affect the state of
the flip-flops.
Function Table
L
=
LOW Voltage Level
H
=
HIGH Voltage Level
X
=
Immaterial
Z
=
High Impedance
=
LOW-to-HIGH Transition
NC
=
No Change
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.
Pin Names
Description
U.L.
Input I
IH
/I
IL
HIGH/LOW
Output I
OH
/I
OL
D
0
D
9
Data Inputs
1.0/1.0
20
A/
-
0.6 mA
OE
Output Enable
1.0/1.0
20
A/
-
0.6 mA
3-STATE Input
CP
Clock Input
1.0/1.0
20
A/
-
0.6 mA
O
0
O
9
3-STATE Outputs
150/40 (33.3)
-
3.0 mA/24 mA (20 mA)
Inputs
Internal Output
Function
OE
CP
D
Q
O
H
H
X
NC
Z
Hold
H
L
X
NC
Z
Hold
H
L
H
Z
Load
H
H
L
Z
Load
L
L
H
L
Data Available
L
H
L
H
Data Available
L
H
X
NC
NC
No Change in Data
L
L
X
NC
NC
No Change in Data
3
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7
4F821
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Storage Temperature
-
65
C to
+
150
C
Ambient Temperature under Bias
-
55
C to
+
125
C
Junction Temperature under Bias
-
55
C to
+
150
C
V
CC
Pin Potential to Ground Pin
-
0.5V to
+
7.0V
Input Voltage (Note 2)
-
0.5V to
+
7.0V
Input Current (Note 2)
-
30 mA to
+
5.0 mA
Voltage Applied to Output
in HIGH State (with V
CC
=
0V)
Standard Output
-
0.5V to V
CC
3-STATE Output
-
0.5V to
+
5.5V
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
Free Air Ambient Temperature
0
C to
+
70
C
Supply Voltage
+
4.5V to
+
5.5V
Symbol
Parameter
Min
Typ
Max
Units
V
CC
Conditions
V
IH
Input HIGH Voltage
2.0
V
Recognized as a HIGH Signal
V
IL
Input LOW Voltage
0.8
V
Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage
-
1.2
V
Min
I
IN
=
-
18 mA
V
OH
Output HIGH
10% V
CC
2.5
V
Min
I
OH
=
-
1 mA
Voltage
10% V
CC
2.4
I
OH
=
-
3 mA
5% V
CC
2.7
I
OH
=
-
1 mA
5% V
CC
2.7
I
OH
=
-
3 mA
V
OL
Output LOW
10% V
CC
0.5
V
Min
I
OL
=
24 mA
Voltage
I
IH
Input HIGH Current
5.0
A
Max
V
IN
=
2.7V
I
BVI
Input HIGH Current
7.0
A
Max
V
IN
=
7.0V
Breakdown Test
I
CEX
Output HIGH
50
A
Max
V
OUT
=
V
CC
Leakage Current
V
ID
Input Leakage
4.75
V
0.0
I
ID
=
1.9
A,
Test
All Other Pins Grounded
I
OD
Output Leakage
3.75
A
0.0
V
IOD
=
150 mV
Circuit Current
All Other Pins Grounded
I
IL
Input LOW Current
-
0.6
mA
Max
V
IN
=
0.5V
I
OZH
Output Leakage Current
50
A
Max
V
OUT
=
2.7V
I
OZL
Output Leakage Current
-
50
A
Max
V
OUT
=
0.5V
I
OS
Output Short-Circuit Current
-
60
-
150
mA
Max
V
OUT
=
0V
I
CCZ
Power Supply Current
78
100
mA
Max
V
O
=
HIGH Z
5
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7
4F821
Physical Dimensions
inches (millimeters) unless otherwise noted
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M24B
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