Chapter 1: DC and Switching Characteristics of HardCopy III Devices

1–3

Electrical Characteristics

© December 2008

Altera Corporation

HardCopy III Device Handbook, Volume 3

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

overshoot voltage is displayed in red and is present at the HardCopy III pin, up to

4.1 V. From Table 1–2, for an overshoot of up to 4.1 V, the percentage of high time for

overshoot > 3.15 V can be as high as 46% over an 11.4 year period. The percentage of

high-time is calculated as (delta T/T) × 100. This 11.4 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 where the device is in an idle state, lifetimes are

increased.

Recommended Operating Conditions

This section lists the functional operation limits for AC and DC parameters for

HardCopy III devices. The steady-state voltage and current values expected from

HardCopy III devices are provided in Table 1–3. All supplies are required to

power supplies is bounded by the minimum and maximum specifications listed in

Table 1–3.

Figure 1–1. Overshoot Duration

3.0 V

3.15 V

4.1 V

T

ΔT

Table 1–3. HardCopy III Device Recommended Operating Conditions – Preliminary (Part 1 of 2)

Symbol

Parameter

Conditions

Minimum

Typical

Maximum

Unit

V

CCL (1)

Core voltage power supply for

internal logic and input buffers

—

0.87

0.9

0.93

V

V

CC (1)

I/O registers power supply

—

0.87

0.9

0.93

V

V

CCD_PLL (1)

PLL digital power supply

—

0.87

0.9

0.93

V

V

CCA_PLL

PLL analog power supply

—

2.375

2.5

2.625

V

V

CCPT (2)

Power supply for the temperature

sensing diode

—

2.375

2.5

2.625

V

V

CCPGM

Configuration pins power supply,

3.0 V

—

2.85

3.0

3.15

V

Configuration pins power supply,

2.5 V

—

2.375

2.5

2.625

V

Configuration pins power supply,

1.8 V

—

1.71

1.8

1.89

V