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EP1C12F324C8 数据表(PDF) 60 Page - Altera Corporation |
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EP1C12F324C8 数据表(HTML) 60 Page - Altera Corporation |
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60 / 94 page  60 Altera Corporation Cyclone FPGA Family Data Sheet Preliminary Information The Cyclone VCCINT pins must always be connected to a 1.5-V power supply. If the VCCINT level is 1.5 V, then input pins are 1.5-V, 1.8-V, 2.5-V, and 3.3-V tolerant. The VCCIO pins can be connected 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 (i.e., 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 17 summarizes Cyclone MultiVolt I/O support. Notes to Table 17: (1) The PCI clamping diode must be disabled to drive an input with voltages higher than VCCIO. (2) When VCCIO = 1.5 V and a 2.5- or 3.3-V input signal feeds an input pin, higher pin leakage current is expected. (3) When VCCIO = 1.8 V, a Cyclone device can drive a 1.5-V device with 1.8-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) When VCCIO = 2.5 V, a Cyclone device can drive a 1.5-V or 1.8-V device with 2.5-V tolerant inputs. (6) Cyclone devices can be 5.0-V tolerant with the use of an external resistor and the internal PCI clamp diode. (7) When VCCIO = 3.3 V, a Cyclone device can drive a 1.5-V, 1.8-V, or 2.5-V device with 3.3-V tolerant inputs. (8) When VCCIO = 3.3 V, a Cyclone device can drive a device with 5.0-V LVTTL inputs but not 5.0-V LVCMOS inputs. Power Sequencing & Hot Socketing Because Cyclone devices can be used in a mixed-voltage environment, they have been designed specifically to tolerate any possible power-up sequence. Therefore, the VCCIO and VCCINT power supplies may be powered in any order. Signals can be driven into Cyclone devices before and during power up without damaging the device. In addition, Cyclone devices do not drive out during power up. Once operating conditions are reached and the device is configured, Cyclone devices operate as specified by the user. IEEE Std. 1149.1 (JTAG) Boundary Scan Support All Cyclone devices provide JTAG BST circuitry that complies with the IEEE Std. 1149.1a-1990 specification. JTAG boundary-scan testing can be performed either before or after, but not during configuration. Cyclone devices can also use the JTAG port for configuration together with either the Quartus II software or hardware using either Jam Files (.jam) or Jam Byte-Code Files (.jbc). Table 17. Cyclone MultiVolt I/O Support Note (1) VCCIO (V) Input Signal Output Signal 1.5 V1.8 V2.5 V3.3 V5.0 V1.5 V1.8 V2.5 V3.3 V5.0 V 1.5 vv v (2) v (2) v 1.8 vvv v (3) v 2.5 vv v (5) v (5) v 3.3 v (4) vv (6) v (7) v (7) v (7) vv (8) |
类似零件编号 - EP1C12F324C8 |
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类似说明 - EP1C12F324C8 |
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