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5M160ZT100I5 参数 Datasheet PDF下载

5M160ZT100I5图片预览
型号: 5M160ZT100I5
PDF下载: 下载PDF文件 查看货源
内容描述: [Flash PLD, 14ns, PQFP100, 16 X 16 MM, 0.50 MM PITCH, TQFP-100]
分类和应用: 时钟可编程逻辑
文件页数/大小: 166 页 / 4004 K
品牌: ALTERA [ ALTERA CORPORATION ]
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Chapter 5: Using MAX V Devices in Multi-Voltage Systems  
5–5  
5.0-V Device Compatibility  
Table 5–1. 3.3-V LVTTL/LVCMOS Programmable Drive Strength (Part 2 of 2)  
I/O Standard  
IOH/IOL Current Strength Setting (mA)  
8
4
3.3-V LVCMOS  
To compute the required value of REXT, first calculate the model of the open-drain  
transistors on the MAX V device. You can model this output resistor (REXT) by  
dividing VOL by IOL (REXT = VOL/IOL). Table 5–2 lists the maximum VOL for the 3.3-V  
LVTTL/LVCMOS I/O standard for MAX V devices.  
f For more information about I/O standard specifications, refer to the DC and Switching  
Characteristics for MAX V Devices chapter.  
Table 5–2. 3.3-V LVTTL/LVCMOS Maximum VOL  
I/O Standard  
Voltage (V)  
0.45  
3.3-V LVTTL  
3.3-V LVCMOS  
0.20  
Select REXT so that the MAX V device’s IOL specification is not violated. You can  
compute the required pull-up resistor value of REXT by using the equation:  
REXT = (VCC/IOL) – RINT. For example, if an I/O pin is configured as a 3.3-V LVTTL  
with a 16 mA drive strength, given that the maximum power supply (VCC) is 5.5 V,  
you can calculate the value of REXT as follows:  
Equation 5–1.  
5.5 V 0.45 V  
REXT = ---------------------------------------- = 315.6   
16 mA  
This resistor value computation assumes worst-case conditions. You can adjust the  
R
EXT value according to the device configuration drive strength. Additionally, if your  
system does not see a wide variation in voltage-supply levels, you can adjust these  
calculations accordingly.  
Because MAX V devices are 3.3-V, 32-bit, 66-MHz PCI compliant, the input circuitry  
accepts a maximum high-level input voltage (VIH) of 4.0 V. To drive a MAX V device  
with a 5.0-V device, you must connect a resistor (R2) between the MAX V device and  
the 5.0-V device.  
December 2010 Altera Corporation  
MAX V Device Handbook  
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