11c90 National Semiconductor Corporation, 11c90 Datasheet - Page 7

• Manufacturer Part Number: 11c90
• Description: 650 Mhz Prescalers
• Manufacturer: National Semiconductor Corporation

Functional Description
The ECL outputs have no pull-down resistors and can drive
series or parallel terminated transmission lines For short
interconnections that do not require impedance matching a
270X to 510X resistor to V
V
Logic Diagram 11C90
Note This diagram is provided for understanding of logic operation only It should not be used for evaluation of propagation delays as many internal functions are
achieved more efficiently than shown
Note A HIGH on MS forces all Qs HIGH
OL
level Both V
Count Sequence Table 11C90
CC
pins must always be used and should
EE
can be used to establish the
(Continued)
TL F 9892 – 7
7
be connected together as close to the package as possible
Pin 12 must always be connected to the V
supply while pin 13 is required only if the TTL output is
used Low impedance V
pass capacitors are recommended to prevent crosstalk
H
L
X
e
e
e
MS
LOW Voltage Level
Don’t Care
HIGH Voltage Level
H
L
L
L
L
Operating Mode Table 11C90
CE
H
X
L
L
L
Inputs
CC
M
H
X
X
L
X
1
and V
EE
M
X
X
X
H
L
distribution and RF by-
2
EE
Set HIGH
Hold
Response
d
d
d
TL F 9892 – 6
Output
11
10
10
side of the