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74ACQ373SC

P1-P3P4-P6P7-P9P10-P10
© 1999 Fairchild Semiconductor Corporation DS010237 www.fairchildsemi.com
July 1989
Revised November 1999
74ACQ373 • 74ACTQ373 Quiet Series Octal Transparent Latch with 3-STATE Outputs
74ACQ373 • 74ACTQ373
Quiet Series Octal Transparent Latch
with 3-STATE Outputs
General Description
The ACQ/ACTQ373 consists of eight latches with 3-STATE
outputs for bus organized system applications. The latches
appear transparent to the data when Latch Enable (LE) is
HIGH. When LE is LOW, the data satisfying the input tim-
ing requirements 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.
The ACQ/ACTQ373 utilizes Fairchild Quiet Series tech-
nology to guarantee quiet output switching and improve
dynamic threshold performance. features GTO output
control and undershoot corrector in addition to a split
ground bus for superior performance.
Features
■ I
CC
and I
OZ
reduced by 50%
■ Guaranteed simultaneous switching noise level and
dynamic threshold performance
■ Guaranteed pin-to-pin skew AC performance
■ Improved latch up immunity
■ Eight latches in a single package
■ 3-STATE outputs drive bus lines or buffer memory
address registers
■ Outputs source/sink 24 mA
■ Faster prop delays than the standard AC/ACT373
Ordering Code:
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagram Pin Descriptions
FACT, Quiet Series, FACT Quiet Series, and GTO are trademarks of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74ACQ373SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ACQ373SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACQ373PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001m 0.300” Wide
74ACTQ373SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ACTQ373SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACQT373QSC MQA20 20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150” Wide
74ACTQ373PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001m 0.300” Wide
Pin Names Description
D
0
–D
7
Data Inputs
LE Latch Enable Input
OE
Output Enable Input
O
0
–O
7
3-STATE Latch Outputs
www.fairchildsemi.com 2
74ACQ373 • 74ACTQ373
Logic Symbols
IEEE/IEC
Functional Description
The ACQ/ACTQ373 contains eight D-type latches with 3-
STATE standard outputs. When the Latch Enable (LE)
input is HIGH, data on the D
n
inputs enters the latches. In
this condition the latches are transparent, i.e., a latch out-
put 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 at setup time preceding 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.
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
Z = High Impedance
X = Immaterial
O
0
= Previous O
0
before HIGH-to-LOW transition of Latch Enable
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.
Inputs Outputs
LE OE
D
n
O
n
X H X Z
H L L L
H L H H
L L X O
0
3 www.fairchildsemi.com
74ACQ373 • 74ACTQ373
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, with-
out exception, to ensure that the system design is reliable over its power
supply, temperature, and output/input loading variables. Fairchild does not
recommend operation of FACT circuits outside databook specifications.
DC Electrical Characteristics for ACQ
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
= −0.5V −20 mA
V
I
= V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to V
CC
+ 0.5V
DC Output Diode Current (I
OK
)
V
O
= −0.5V −20 mA
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
DC Latchup Source
or Sink Current ±300 mA
Junction Temperature (T
J
)
PDIP 140°C
Supply Voltage (V
CC
)
ACQ 2.0V to 6.0V
ACTQ 4.5V to 5.5V
Input Voltage (V
I
) 0V to V
CC
Output Voltage (V
O
) 0V to V
CC
Operating Temperature (T
A
) −40°C to +85°C
Minimum Input Edge Rate ∆V/∆t
ACQ Devices
V
IN
from 30% to 70% of V
CC
V
CC
@ 3.0V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate ∆V/∆t
ACTQ Devices
V
CC
@ 4.5V, 5.5V 125 mV/ns
Symbol Parameter
V
CC
T
A
= +25°C T
A
= −40°C to +85°C
Units Conditions
(V) Typ Guaranteed Limits
V
IH
Minimum HIGH Level 3.0 1.5 2.1 2.1 V
OUT
= 0.1V
Input Voltage 4.5 2.25 3.15 3.15 V or V
CC
− 0.1V
5.5 2.75 3.85 3.85
V
IL
Maximum LOW Level 3.0 1.5 0.9 0.9 V
OUT
= 0.1V
Input Voltage 4.5 2.25 1.35 1.35 V or V
CC
− 0.1V
5.5 2.75 1.65 1.65
V
OH
Minimum HIGH Level 3.0 2.99 2.9 2.9
Output Voltage 4.5 4.49 4.4 4.4 V I
OUT
= −50 µA
5.5 5.49 5.4 5.4
V
IN
= V
IL
or V
IH
3.0 2.56 2.46 I
OH
= −12 mA
4.5 3.86 3.76 V I
OH
= −24 mA
5.5 4.86 4.76 I
OH
= −24 mA (Note 2)
V
OL
Maximum LOW Level 3.0 0.002 0.1 0.1
Output Voltage 4.5 0.001 0.1 0.1 V I
OUT
= 50 µA
5.5 0.001 0.1 0.1
V
IN
= V
IL
or V
IH
3.0 0.36 0.44 I
OL
= 12 mA
4.5 0.36 0.44 V I
OL
= 24 mA
5.5 0.36 0.44 I
OL
= 24 mA (Note 2)
I
IN
(Note 4) Maximum Input Leakage Current 5.5 ± 0.1 ± 1.0 µAV
I
= V
CC
, GND
I
OLD
Minimum Dynamic 5.5 75 mA V
OLD
= 1.65V Max
I
OHD
Output Current (Note 3) 5.5 −75 mA V
OHD
= 3.85V Min
I
CC
(Note 4) Maximum Quiescent Supply Current 5.5 4.0 40.0 µAV
IN
= V
CC
or GND
I
OZ
Maximum 3-STATE V
I
(OE) = V
IL
, V
IH
Leakage Current 5.5 ±0.25 ±2.5 µAV
I
= V
CC
, GND
V
O
= V
CC
, GND
V
OLP
Quiet Output
5.0 1.1 1.5 V
Figure 1, Figure 2
Maximum Dynamic V
OL
(Note 5)(Note 6)
V
OLV
Quiet Output
5.0 −0.6 −1.2 V
Figure 2, Figure 2
Maximum Dynamic V
OL
(Note 5)(Note 6)
P1-P3P4-P6P7-P9P10-P10

74ACQ373SC

Mfr. #:
Buy 74ACQ373SC
Manufacturer:
ON Semiconductor
Description:
IC LATCH OCTAL D-TYPE 20-SOIC
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