Datasheet > 1.5-VLVCMOS

1.5-VLVCMOS

更新时间： 2022-06-03 06:49:27

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描述
This chapterdescribes the electric characteristics, switching characteristics,and I/O timing for Cyclone III devices. A glossary is also included for your reference

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Chapter 1: Cyclone III Device Datasheet

1–3

Electrical Characteristics

A DC signal is equivalent to 100% duty cycle. For example, a signal that overshoots to

4.2 V can only be at 4.2 V for 10.74% over the lifetime of the device; for device lifetime

of 10 years, this amounts to 10.74/10ths of a year.

Table 1–2. Cyclone III Devices Maximum Allowed Overshoot During Transitions over a 10-Year

(1)

Time Frame

Symbol

Parameter

Condition

V_I= 3.95 V

V_I= 4.0 V

Overshoot Duration as % of High Time

Unit

100

95.67

55.24

31.97

18.52

10.74

6.23

V_I= 4.05 V

V_I= 4.10 V

V_I= 4.15 V

V_I= 4.20 V

V_I= 4.25 V

V_I= 4.30 V

V_I= 4.35 V

V_I= 4.40 V

V_I= 4.45 V

V_I= 4.50 V

V_I= 4.60 V

V_I= 4.70 V

AC Input

Voltage

V_i

3.62

2.1

1.22

0.71

0.41

0.14

0.047

Note to Table 1–2:

(1) Figure 1–1 shows the methodology to determine the overshoot duration. In the example in Figure 1–1, overshoot

voltage is shown in red and is present on the input pin of the Cyclone III device at over 4.1 V but below 4.2 V. From

Table 1–1, for an overshoot of 4.1 V, the percentage of high time for the overshoot can be as high as 31.97% over

a 10-year period. Percentage of high time is calculated as ([delta T]/T) × 100. This 10-year period assumes the

device is always turned on with 100% I/O toggle rate and 50% duty cycle signal. For lower I/O toggle rates and

situations in which the device is in an idle state, lifetimes are increased.

Figure 1–1 shows the methodology to determine the overshoot duration.

Figure 1–1. Cyclone III Devices Overshoot Duration

4.2 V

4.1 V

3.3 V

ΔT

July 2012 Altera Corporation

Cyclone III Device Handbook

Volume 2

1 234 5 6 7...34

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