© 2000 Fairchild Semiconductor Corporation DS006226 www.fairchildsemi.com
April 1984
Revised February 2000
DM74ALS573B Extended Temperature Octal D-Type Transparent Latch with 3-STATE Outputs
DM74ALS573B
Extended Temperature 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 DM74ALS573B are transparent D-
type latches. 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 equivalent with DM74LS373
■ Improved AC performance over DM74LS373 at approxi-
mately half the power
■ 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
DM74ALS573BWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS573BSJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS573BN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
