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EPM240 数据表(PDF) 40 Page - Altera Corporation |
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EPM240 数据表(HTML) 40 Page - Altera Corporation |
40 / 88 page 2–32 Chapter 2: MAX II Architecture Referenced Documents MAX II Device Handbook © October 2008 Altera Corporation Connect VCCIO pins to either a 1.5-V, 1.8 V, 2.5-V, or 3.3-V power supply, depending on the output requirements. The output levels are compatible with systems of the same voltage as the power supply (that is, when VCCIO pins are connected to a 1.5-V power supply, the output levels are compatible with 1.5-V systems). When VCCIO pins are connected to a 3.3-V power supply, the output high is 3.3 V and is compatible with 3.3-V or 5.0-V systems. Table 2–7 summarizes MAX II MultiVolt I/O support. f For information about output pin source and sink current guidelines, refer to the AN 428: MAX II CPLD Design Guidelines. Referenced Documents This chapter referenced the following documents: ■ AN 428: MAX II CPLD Design Guidelines ■ DC and Switching Characteristics chapter in the MAX II Device Handbook ■ Hot Socketing and Power-On Reset in MAX II Devices chapter in the MAX II Device Handbook ■ Using User Flash Memory in MAX II Devices chapter in the MAX II Device Handbook Table 2–7. MAX II MultiVolt I/O Support (Note 1) VCCIO (V) Input Signal Output Signal 1.5 V 1.8 V 2.5 V 3.3 V 5.0 V 1.5 V 1.8 V 2.5 V 3.3 V 5.0 V 1.5 vvv v — v —— —— 1.8 vvv v — v (2) v —— — 2.5 —— vv — v (3) v (3) v —— 3.3 —— v (4) vv (5) v (6) v (6) v (6) vv (7) Notes to Table 2–7: (1) To drive inputs higher than VCCIO but less than 4.0 V including the overshoot, disable the I/O clamp diode. However, to drive 5.0-V inputs to the device, enable the I/O clamp diode to prevent VI from rising above 4.0 V. (2) When VCCIO = 1.8 V, a MAX II device can drive a 1.5-V device with 1.8-V tolerant inputs. (3) When VCCIO = 2.5 V, a MAX II device can drive a 1.5-V or 1.8-V device with 2.5-V tolerant inputs. (4) When VCCIO = 3.3 V and a 2.5-V input signal feeds an input pin, the VCCIO supply current will be slightly larger than expected. (5) MAX II devices can be 5.0-V tolerant with the use of an external resistor and the internal I/O clamp diode on the EPM1270 and EPM2210 devices. (6) When VCCIO = 3.3 V, a MAX II device can drive a 1.5-V, 1.8-V, or 2.5-V device with 3.3-V tolerant inputs. (7) When VCCIO = 3.3 V, a MAX II device can drive a device with 5.0-V TTL inputs but not 5.0-V CMOS inputs. In the case of 5.0-V CMOS, open- drain setting with internal I/O clamp diode (available only on EPM1270 and EPM2210 devices) and external resistor is required. |
类似零件编号 - EPM240_10 |
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类似说明 - EPM240_10 |
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