DM74ALS564A

DM74ALS564A Octal D-Type Edge-Triggered Flip-Flop with

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DM74ALS564A Octal D-Type Edge-Triggered Flip-Flop with

May 2007

DM74ALS564A Octal D-Type Edge-Triggered Flip-Flop with
Features
Switching specifications at 50pF Switching specifications guaranteed over full

General Description
These 8-bit registers feature totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or relatively 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 interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight flip-flops of the DM74ALS564A are edgetriggered inverting D-type flip-flops. On the positive transition of the clock, the Q outputs will be set to the complement of the logic states that were set up at the D inputs. 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 highimpedance state the outputs neither load nor drive the bus lines significantly. The output control does not affect the
internal operation of the flip-flops. That is, the old data can be retained or new data can be entered even while the outputs are OFF.

temperature and VCC range
Advanced oxide-isolated, ion-implanted Schottky TTL

process
3-STATE buffer-type outputs drive bus lines directly

Ordering Information
Order Number
DM74ALS564AWM

Package Number
M20B

Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering number.

1986 Fairchild Semiconductor Corporation DM74ALS564A Rev. 1.3

www.fairchildsemi.com