74vcx16722 Fairchild Semiconductor, 74vcx16722 Datasheet - Page 2

• Manufacturer Part Number: 74vcx16722
• Description: 74vcx16722 Low Voltage 22-bit Register With 3.6v Tolerant Inputs And Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Connection Diagram
Functional Description
The VCX16722 contains twenty-two D-type flip-flops with
3-STATE standard outputs. The twenty-two 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 out-
puts are in high impedance mode but this does not inter-
fere with entering new data into the flip-flops.
2
Pin Descriptions
Truth Table
Logic Diagram
O
H
X
Z
L
n
High Impedance
Logic HIGH
Logic LOW
Don’t Care, but not floating
Previous O
LOW-to-HIGH Clock Transition
Pin Names
OE
CE
CLK
D
O
L or H
0
0
CLK
- D
- O
X
X
21
21
n
before LOW-to-HIGH Clock Transition
CE
Output Enable Input (Active LOW)
Clock Enable Input (Active Low)
Clock Input
Data Inputs
3-STATE Outputs
X
H
L
L
L
OE
H
L
L
L
L
Description
D
H
X
X
L
X
n
O
O
O
Z
H
L
n
n
n