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DM74AS373N

Part # DM74AS373N
Description IC LATCH TRANSP OCT D 3ST 20-DIP
Category IC
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National Semiconductor Corp
Date Code: 8712
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 2000 Fairchild Semiconductor Corporation DS006309 www.fairchildsemi.com
April 1984
Revised March 2000
DM74AS373 Octal D-Type Transparent Latch with 3-STATE Outputs
DM74AS373
Octal D-Type Transparent Latch with 3-STATE Outputs
General Description
These 8-bit registers feature totem-pole 3-STATE outputs
designed specifically for driving highly-capacitive or rela-
tively low-impedance loads. The high-impedance state and
increased high-logic-level drive provide these registers with
the capability of being connected directly to and driving the
bus lines in a bus-organized system without need for inter-
face or pull-up components. They are particularly attractive
for implementing buffer registers, I/O ports, bidirectional
bus drivers, and working registers.
The eight latches of the DM74AS373 are transparent D-
type latches, meaning that while the enable (G) is HIGH
the Q outputs will follow the data (D) inputs. When the
enable is taken LOW the output will be latched at the level
of the data that was set up.
A buffered output control input can be used to place the
eight outputs in either a normal logic state (HIGH or LOW
logic levels) or a high impedance state. In the high-imped-
ance state the outputs neither load nor drive the bus lines
significantly.
The output control does not affect the internal operation of
the latches. That is, the old data can be retained or new
data can be entered even while the outputs are OFF.
Features
Switching specifications at 50 pF
Switching specifications guaranteed over full tempera-
ture and V
CC
range
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Functionally and pin for pin compatible with LS and ALS
TTL counterparts
Improved AC performance over LS and ALS TTL coun-
terparts
3-STATE buffer-type outputs drive bus lines directly
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Order Number Package Number Package Description
DM74AS373WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74AS373N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
www.fairchildsemi.com 2
DM74AS373
Logic Diagram Function Table
L = LOW State
H = HIGH State
X = Don’t Care
Z = High Impedance State
Q
0
= Previous Condition of Q
Output Enable Output
Control G D Q
LHHH
LHLL
LLXQ
0
HXXZ
3 www.fairchildsemi.com
DM74AS373
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 2: The () arrow indicates the negative edge of the enable is used for reference.
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at V
CC
= 5V, T
A
= 25°C.
Supply Voltage 7V
Input Voltage 7V
Voltage Applied to Disabled Output 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range 65°C to +150°C
Typical θ
JA
N Package 52.5°C/W
M Package 70.5°C/W
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current 15 mA
I
OL
LOW Level Output Current 48 mA
t
W
Width of Enable Pulse, HIGH 4.5 ns
t
SU
Data Setup Time (Note 2) 2 ns
t
H
Data Hold Time (Note 2) 3 ns
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage V
CC
= 4.5V, I
I
= 18 mA 1.2 V
V
OH
HIGH Level Output V
CC
= 4.5V, I
OH
= Max 2.4 3.2
V
Voltage I
OH
= 2 mA, V
CC
= 4.5V to 5.5V V
CC
2
V
OL
LOW Level Output Voltage V
CC
= 4.5V, I
OL
= Max 0.35 0.5 V
I
I
Input Current at Max Input Voltage V
CC
= 5.5V, V
IH
= 7V 0.1 mA
I
IH
HIGH Level Input Current V
CC
= 5.5V, V
IH
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= 5.5V, V
IL
= 0.4V 0.5 mA
I
O
Output Drive Current V
CC
= 5.5V, V
O
= 2.25V 30 112 mA
I
OZH
OFF-State Output Current with V
CC
= 5.5V, V
O
= 2.7V 50 µA
HIGH Level Voltage Applied
I
OZL
OFF-State Output Current with V
CC
= 5.5V, V
O
= 0.4V 50 µA
LOW Level Voltage Applied
I
CC
Supply Current V
CC
= 5.5V Outputs HIGH 55 90
Outputs Open Outputs LOW 55 85 mA
Outputs Disabled 65 100
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