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GAL22V10D-25LJ Datasheet(PDF) 16 Page - Lattice Semiconductor

Part No. GAL22V10D-25LJ
Description  Product Change Notifications (PCNs) have been issued to discontinue all devices in this data sheet.
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Manufacturer  LATTICE [Lattice Semiconductor]
Direct Link  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

GAL22V10D-25LJ Datasheet(HTML) 16 Page - Lattice Semiconductor

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Specifications GAL22V10
14
(Vref Typical = 3.2V)
(Vref Typical = 3.2V)
Circuitry within the GAL22V10 provides a reset signal to all reg-
isters during power-up. All internal registers will have their Q out-
puts set low after a specified time (tpr, 1μs MAX). As a result, the
state on the registered output pins (if they are enabled) will be
either high or low on power-up, depending on the programmed
polarity of the output pins. This feature can greatly simplify state
machine design by providing a known state on power-up. The
timing diagram for power-up is shown below. Because of the asyn-
chronous nature of system power-up, some conditions must be
met to guarantee a valid power-up reset of the GAL22V10. First,
the Vcc rise must be monotonic. Second, the clock input must
be at static TTL level as shown in the diagram during power up.
The registers will reset within a maximum of tpr time. As in nor-
mal system operation, avoid clocking the device until all input and
feedback path setup times have been met. The clock must also
meet the minimum pulse width requirements.
Vcc
PIN
Vcc
Vref
Active Pull-up
Circuit
ESD
Protection
Circuit
ESD
Protection
Circuit
Vcc
PIN
Vcc (min.)
tpr
Internal Register
Reset to Logic "0"
Device Pin
Reset to Logic "1"
twl
tsu
Device Pin
Reset to Logic "0"
Vc c
CL K
INTERNAL REGISTER
Q - OUTPUT
ACTIVE LOW
OUTPUT REGISTER
ACTIVE HIGH
OUTPUT REGISTER
Vcc
PIN
Vref
Tri-State
Control
Active Pull-up
Circuit
Feedback
(To Input Buffer)
PIN
Feedback
Data
Output
Typical Input
Typical Output
Power-Up Reset
Input/Output Equivalent Schematics


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