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EPM7256AE 数据表(PDF) 25 Page - Altera Corporation |
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EPM7256AE 数据表(HTML) 25 Page - Altera Corporation |
25 / 64 page Altera Corporation 25 MAX 7000A Programmable Logic Device Data Sheet Open-Drain Output Option MAX 7000A devices provide an optional open-drain (equivalent to open-collector) output for each I/O pin. This open-drain output enables the device to provide system-level control signals (e.g., interrupt and write enable signals) that can be asserted by any of several devices. This output can also provide an additional wired-OR plane. Open-drain output pins on MAX 7000A devices (with a pull-up resistor to the 5.0-V supply) can drive 5.0-V CMOS input pins that require a high VIH. When the open-drain pin is active, it will drive low. When the pin is inactive, the resistor will pull up the trace to 5.0 V to meet CMOS VOH requirements. The open-drain pin will only drive low or tri-state; it will never drive high. The rise time is dependent on the value of the pull-up resistor and load impedance. The IOL current specification should be considered when selecting a pull-up resistor. Programmable Ground Pins Each unused I/O pin on MAX 7000A devices may be used as an additional ground pin. In EPM7128A and EPM7256A devices, utilizing unused I/O pins as additional ground pins requires using the associated macrocell. In MAX 7000AE devices, this programmable ground feature does not require the use of the associated macrocell; therefore, the buried macrocell is still available for user logic. Slew-Rate Control The output buffer for each MAX 7000A I/O pin has an adjustable output slew rate that can be configured for low-noise or high-speed performance. A faster slew rate provides high-speed transitions for high-performance systems. However, these fast transitions may introduce noise transients into the system. A slow slew rate reduces system noise, but adds a nominal delay of 4 to 5 ns. When the configuration cell is turned off, the slew rate is set for low-noise performance. Each I/O pin has an individual EEPROM bit that controls the slew rate, allowing designers to specify the slew rate on a pin-by-pin basis. The slew rate control affects both the rising and falling edges of the output signal. |
类似零件编号 - EPM7256AE |
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类似说明 - EPM7256AE |
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