DM74ALS373 Octal D-Type 3-STATE Transparent Latch
April 1984
Revised February 2000
DM74ALS373
Octal D-Type 3-STATE Transparent Latch
General Description Features
These 8-bit registers feature totem-pole 3-STATE outputs Switching specifications at 50 pF
designed specifically for driving highly-capacitive or rela-
Switching specifications guaranteed over full tempera-
tively low-impedance loads. The high-impedance state and
ture and V range
CC
increased high-logic-level drive provide these registers with
Advanced oxide-isolated, ion-implanted Schottky TTL
the capability of being connected directly to and driving the
process
bus lines in a bus-organized system without need for inter-
Functionally and pin for pin compatible with LS TTL
face or pull-up components. They are particularly attractive
counterpart
for implementing buffer registers, I/O ports, bidirectional
bus drivers, and working registers.
Improved AC performance over DM74LS373 at approxi-
mately half the power
The eight latches of the DM74ALS373 are transparent D-
type latches. While the enable (G) is HIGH the Q outputs
3-STATE buffer-type outputs drive bus lines directly
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.
Ordering Code:
Order Number Package Number Package Description
DM74ALS373WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS373SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS373N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code.
Connection Diagram
2000 Fairchild Semiconductor Corporation DS006220 www.fairchildsemi.comFunction Table Logic Diagram
Output Enable D Output
Control G Q
LH H H
LH L L
LL X Q
0
HX X Z
L = LOW State
H = HIGH State
X = Dont Care
Z = High Impedance State
Q = Previous Condition of Q
0
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DM74ALS373