参数资料
型号: EP20K200CB652C8
英文描述: 5V, Byte Alterable EEPROM; Temperature Range: -55°C to 125°C; Package: 32-PLCC
中文描述: 专用集成电路
文件页数: 56/114页
文件大小: 1623K
代理商: EP20K200CB652C8
46
Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
MultiVolt I/O
Interface
The APEX device architecture supports the MultiVolt I/O interface
feature, which allows APEX devices in all packages to interface with
systems of different supply voltages. The devices have one set of VCC pins
for internal operation and input buffers (VCCINT), and another set for I/O
output drivers (VCCIO).
The APEX 20K VCCINT pins must always be connected to a 2.5 V power
supply. With a 2.5-V VCCINT level, input pins are 2.5-V and 3.3-V tolerant.
Certain devices, identified by a “V” suffix following the speed grade in the
ordering code (e.g., EP20K400BC652-1V), are 5.0-V tolerant. The VCCIO
pins can be connected to either a 2.5-V or 3.3-V power supply, depending
on the output requirements. When VCCIO pins are connected to a 2.5-V
power supply, the output levels are compatible with 2.5-V systems. When
the 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 12 summarizes 5.0-V tolerant APEX 20K MultiVolt I/O support.
Notes:
(1)
The PCI clamping diode must be disabled to drive an input with voltages higher
than VCCIO.
(2)
APEX 20K devices with a “V” suffix are 5.0-V tolerant.
(3)
When VCCIO = 3.3 V, an APEX 20K device can drive a 2.5-V device with 3.3-V
tolerant inputs.
Open-drain output pins on 5.0-V tolerant APEX 20K devices (with a pull-
up resistor to the 5.0-V supply) can drive 5.0-V CMOS input pins that
require a VIH of 3.5 V. When the pin is inactive, the trace will be pulled up
to 5.0 V by the resistor. 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.
Table 12. 5.0-V Tolerant APEX 20K MultiVolt I/O Support
VCCIO (V)
Input Signals (V)
Output Signals (V)
2.5
3.3
5.0
2.5
3.3
5.0
2.5
vv(1)
v
3.3
vv
vv
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