74ALVC16721 Fairchild Semiconductor, 74ALVC16721 Datasheet - Page 2

• Manufacturer Part Number: 74ALVC16721
• Description: Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant Inputs and Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Connection Diagram
Logic Diagram
2
Truth Table
H
L
X
Z

O
Functional Description
The 74ALVC16721 contains twenty D-type flip-flops with
3-STATE standard outputs. The twenty flip-flops will store
the state of their individual D-type inputs that meet the
setup and hold time requirements on the LOW-HIGH Clock
(CLK) transition, when the Clock-Enable (CE) is LOW. The
3-STATE standard outputs are controlled by the Output
Enable (OE). When OE is HIGH, the standard outputs are
in high impedance mode but this does not interfere with
entering new data into the flip-flops.
0
LOW Voltage Level
High Impedance
L or H
HIGH Voltage Level
Immaterial (HIGH or LOW, inputs may not float)
CLK
Previous O
LOW-to-HIGH transition


X
X
0
before LOW-to-HIGH transition of Clock
CE
H
X
L
L
L
OE
H
L
L
L
L
D
0
–D
X
X
H
X
L
19
O
0
O
O
–O
H
Z
L
0
0
19