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HD74AC373FPEL Datasheet(PDF) 3 Page - Renesas Technology Corp

Part # HD74AC373FPEL
Description  Octal Transparent Latch with 3-State Output
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD74AC373FPEL Datasheet(HTML) 3 Page - Renesas Technology Corp

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HD74AC373/HD74ACT373
Rev.2.00, Jul.16.2004, page 3 of 9
Truth Table
Inputs
Outputs
OE
OE
OE
OE
LE
D
n
O
n
HX
X
Z
LH
L
L
LH
H
H
LLX
O
0
H :
High Voltage Level
L
:
Low Voltage Level
Z
:
High Impedance
X :
Immaterial
O
0 :
Previous O
0 before Low-to-High Transition of Clock
Functional Description
The HD74AC373/HD74ACT373 contains eight D-type latches with 3-state standard outputs. When the Latch Enable
(LE) input is High, data on the Dn inputs enters the latches. In this condition the latches are transparent, i.e., a latch
output will change state each time its D input changes. When LE is Low, the latches store the information that was
present on the D inputs setup time proceding the High-to-Low transition of LE. The 3-state standard outputs are
controlled by the Output Enable (
OE) input. When OE is Low, the standard outputs are in the 2-state mode. When OE
is High, the standard outputs are in the high impedance mode but this does not interfere with entering new data into the
latches.
Logic Diagram
O7
G
O
D
D7
O6
G
O
D
D6
O5
G
O
D
D5
O4
G
O
D
D4
O3
G
O
D
D3
O2
G
O
D
D2
O1
G
O
D
D1
O0
G
O
D
D0
LE
OE
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Condition
Supply voltage
V
CC
–0.5 to 7
V
–20
mA
V
I = –0.5V
DC input diode current
I
IK
20
mA
V
I = Vcc+0.5V
DC input voltage
V
I
–0.5 to Vcc+0.5
V
–50
mA
V
O = –0.5V
DC output diode current
I
OK
50
mA
V
O = Vcc+0.5V
DC output voltage
V
O
–0.5 to Vcc+0.5
V
DC output source or sink current
I
O
±50
mA
DC V
CC or ground current per output pin
I
CC, IGND
±50
mA
Storage temperature
Tstg
–65 to +150
°C


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