Programmable Skew Clock Buffer (PSCB)
T
ABLE
9. 7B991 P
ROGRAMMABLE
S
KEW
C
ONFIGURATIONS 1
F
UNCTION
S
ELECTS
1F1, 2F1, 3F1, 4F1
LOW
LOW
LOW
MID
MID
MID
HIGH
HIGH
HIGH
1F0, 2F0, 3F0, 4F0
LOW
MID
HIGH
LOW
MID
HIGH
LOW
MID
HIGH
1Q0, 1Q1, 2Q0, 2Q1
-4t
U
-3t
U
-2t
U
-1t
U
0t
U
+1t
U
+2t
U
+3t
U
+4t
U
O
UTPUT
F
UNCTIONS
3Q0, 3Q1
Divide by 2
-6t
U
-4t
U
-2t
U
0t
U
+2t
U
+4t
U
+6t
U
Divide by 4
7B991
4Q0, 4Q1
Divide by 2
-6t
U
-4t
U
-2t
U
0t
U
+2t
U
+4t
U
+6t
U
Inverted
1. For all three state inputs. HIGH indicates a connection to V
CC
. LOW indicates a connection to GND, and MID indicates an open
connections. Internal termination circuitry holds an inconnected input to V
CC
/2.
Memory
F
IGURE
4. T
YPICAL
O
UTPUTS WITH
FB C
ONNECTED TO A
Z
ERO
-S
KEW
O
UTPUT1
1. FB connected to an output selected for “zero” skew (i.e. xF1 = xF0 = MID)
09.23.02 Rev 4
All data sheets are subject to change without notice
9
©2002 Maxwell Technologies.
All rights reserved.
MAXWELL [ MAXWELL TECHNOLOGIES ]
