Rainbow-electronics ATF2500CQL Manual do Utilizador descarregar pdf (Página 3)

ATF2500C Family

0777G–12/01

Power-up Reset The registers in the ATF2500Cs are designed to reset during power-up. At a point delayed

slightly from V

crossing V

RST

, all registers will be reset to the low state. The output state will

depend on the polarity of the output buffer.

This feature is critical for state as nature of reset and the uncertainty of how V

actually rises

in the system, the following conditions are required:

1. The V

rise must be monotonic,

2. After reset occurs, all input and feedback setup times must be met before driving the

clock pin or terms high, and

3. The clock pin, and any signals from which clock terms are derived, must remain stable

during t

Parameter Description Typ Max Units

Power-up Reset Time 600 1000 ns

RST

Power-up Reset Voltage 3.8 4.5 V

Level Forced on

Odd I/O Pin during

PRELOAD Cycle

Q Select Pin

State

Even/Odd

Select

Even Q1 State

after Cycle

Even Q2 State

after Cycle

Odd Q1 State

after Cycle

Odd Q2 State

after Cycle

Low Low High/Low X X X

High Low X High/Low X X

Low High X X High/Low X

High High X X X High/Low

1 2 3 4 5 6 7 8 ... 36 37

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Rainbow-electronics ATF2500CQL Manual do Utilizador Página 3