11C91D datasheet(7/10 Pages) NSC

7 / 10 page

Functional Description (Continued)

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 VEE can be used to establish the

VOL level Both VCC pins must always be used and should

be connected together as close to the package as possible

Pin 12 must always be connected to the VEE side of the

supply while pin 13 is required only if the TTL output is

used Low impedance VCC and VEE distribution and RF by-

pass capacitors are recommended to prevent crosstalk

Logic Diagram 11C90

TLF9892 – 6

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

Count Sequence Table 11C90

TLF9892 – 7

Note

A HIGH on MS forces all Qs HIGH

Operating Mode Table 11C90

Inputs

Output

Response

Set HIGH

Hold

LLLL

H e HIGH Voltage Level

L e LOW Voltage Level

X e Don’t Care

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