74F841 10-Bit Transparent Latch
March 1988
Revised August 1999
74F841
10-Bit Transparent Latch
General Description
The 74F841 bus interface latch is designed to eliminate the
extra packages required to buffer existing latches and pro-
vide extra data width for wider address/data paths or buses
carrying parity. The 74F841 is a 10-bit transparent latch, a
10-bit version of the 74F373.
Features
s
3-STATE output
Ordering Code:
Order Number
74F841SC
74F841SPC
Package Number
M24B
N24C
Package Description
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
© 1999 Fairchild Semiconductor Corporation
DS009599
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74F841
Unit Loading/Fan Out
Pin Names
D
0
–D
9
O
0
–O
9
OE
LE
Description
Data Inputs
3-STATE Outputs
Output Enable Input
Latch Enable
U.L.
HIGH/LOW
1.0/1.0
150/40
1.0/1.0
1.0/1.0
Input I
IH
/I
IL
Output I
OH
/I
OL
20
µA/−0.6
mA
−3
mA/24 mA
20
µA/−0.6
mA
20
µA/−0.6
mA
Functional Description
The 74F841 device consists of ten D-type latches with 3-
STATE outputs. The flip-flops appear transparent to the
data when Latch Enable (LE) is HIGH. This allows asyn-
chronous operation, as the output transition follows the
data in transition.
On the LE HIGH-to-LOW transition, the data that meets the
setup and hold time is latched. Data appears on the bus
when the Output Enable (OE) is LOW. When OE is HIGH
the bus output is in the high impedance state.
Function Table
Inputs
OE
X
H
H
H
L
L
L
L
L
L
H
H
LE
X
H
H
L
H
H
L
X
X
X
L
L
D
X
L
H
X
L
H
X
X
X
X
X
X
Internal
Q
X
L
H
NC
L
H
NC
H
L
H
L
H
Output
Function
O
Z
Z
Z
Z
L
H
NC
H
L
H
Z
Z
High Z
High Z
High Z
Latched
Transparent
Transparent
Latched
Preset
Clear
Preset
Latched
Latched
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
HIGH Impedance
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.
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2
74F841
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Output
in HIGH State (with V
CC
=
0V)
Standard Output
3-STATE Output
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
−0.5V
to V
CC
−0.5V
to
+5.5V
−65°C
to
+150°C
−55°C
to
+125°C
−55°C
to
+150°C
−0.5V
to
+7.0V
−0.5V
to
+7.0V
−30
mA to
+5.0
mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to
+70°C
+4.5V
to
+5.5V
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
Symbol
V
IH
V
IL
V
CD
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
10% V
CC
10% V
CC
5% V
CC
5% V
CC
V
OL
I
IH
I
BVI
I
CEX
V
ID
I
OD
I
IL
I
OZH
I
OZL
I
OS
I
ZZ
I
CCZ
Output LOW
Voltage
Input HIGH
Current
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
69
−60
4.75
3.75
−0.6
50
−50
−150
500
92
10% V
CC
2.5
2.4
2.7
2.7
0.5
5.0
7.0
50
V
µA
µA
µA
V
µA
mA
µA
µA
mA
µA
mA
Min
Max
Max
Max
0.0
0.0
Max
Max
Max
Max
0.0V
Max
V
Min
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
Min
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
I
IN
= −18
mA
I
OH
= −1
mA
I
OH
= −3
mA
I
OH
= −1
mA
I
OH
= −3
mA
I
OL
=
24 mA
V
IN
=
2.7V
V
IN
=
7.0V
V
OUT
=
V
CC
I
ID
=
1.9
µA
All Other Pins Grounded
V
IOD
=
150 mV
All Other Pins Grounded
V
IN
=
0.5V
V
OUT
=
2.7V
V
OUT
=
0.5V
V
OUT
=
0V
V
OUT
=
5.25V
V
O
=
HIGH Z
3
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74F841
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
D
n
to O
n
Propagation Delay
LE to O
n
Output Enable Time
OE to O
n
Output Disable Time
OE to O
n
2.5
1.5
5.0
2.0
2.5
2.5
1.0
1.0
V
CC
= +5.0V
C
L
=
50 pF
Typ
Max
8.0
6.5
12.0
7.5
8.5
9.0
6.5
6.5
T
A
=
0°C to
+70°C
V
CC
= +5.0V
C
L
=
50 pF
Min
2.0
1.5
4.5
2.0
2.0
2.0
1.0
1.0
Max
9.0
7.0
13.5
8.0
9.5
10.0
7.5
7.5
ns
ns
ns
Units
AC Operating Requirements
T
A
= +25°C
Symbol
Parameter
V
CC
= +5.0V
Min
t
S
(H)
t
S
(L)
t
H
(H)
t
H
(L)
t
W
(H)
Setup Time, HIGH or LOW
D
n
to LE
Hold Time, HIGH or LOW
D
n
to LE
LE Pulse Width, HIGH
2.0
2.0
2.5
3.0
4.0
Max
T
A
=
0°C to
+70°C
V
CC
= +5.0V
Min
2.5
2.5
3.0
3.5
4.0
ns
ns
Max
Units
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4
74F841
Physical Dimensions
inches (millimeters) unless otherwise noted
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M24B
5
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