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GAL26CLV12D-7LJ Datasheet(PDF) 11 Page - Lattice Semiconductor |
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GAL26CLV12D-7LJ Datasheet(HTML) 11 Page - Lattice Semiconductor |
11 / 13 page Specifications GAL26CLV12 11 Typ. Vref = Vcc Typical Output Typ. Vref = Vcc Typical Input Circuitry within the GAL26CLV12D provides a reset signal to all registers during power-up. All internal registers will have their Q outputs set low after a specified time (tpr, 1 µs 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 provide a valid power-up reset of the GAL26CLV12D. 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 Vref Tri-State Control Active Pull-up Circuit Feedback (To Input Buffer) PIN Feedback Data Output 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 Power-Up Reset Input/Output Equivalent Schematics |
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