FG256 datasheet(25/108 Pages) ACTEL

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SX-A Family FPGAs

v5.3

2-5

Figure 2-1 shows the 5 V PCI V/I curve and the minimum and maximum PCI drive characteristics of the SX-A family.

IOH = 11.9 * (VOUT – 5.25) * (VOUT + 2.45)

for VCCI > VOUT > 3.1V

EQ 2-1

IOL = 78.5 * VOUT * (4.4 – VOUT)

for 0V < VOUT < 0.71V

EQ 2-2

Figure 2-1 • 5 V PCI V/I Curve for SX-A Family

Voltage Out (V)

–200.0

–150.0

–100.0

–50.0

0.0

50.0

100.0

150.0

200.0

0.5

1.5

2.5

3.5

4.5

5.5

IOH

IOL

IOH MIN Spec

IOH MAX Spec

IOL MIN Spec

IOL MAX Spec

Table 2-9 • DC Specifications (3.3 V PCI Operation)

Symbol

Parameter

Condition

Min.

Max.

Units

VCCA

Supply Voltage for Array

2.25

2.75

VCCI

Supply Voltage for I/Os

3.0

3.6

VIH

Input High Voltage

0.5VCCI

VCCI + 0.5

VIL

Input Low Voltage

–0.5

0.3VCCI

IIPU

Input Pull-up Voltage1

0.7VCCI

–V

IIL

Input Leakage Current2

0 < VIN < VCCI

–10

+10

μA

VOH

Output High Voltage

IOUT = –500 µA

0.9VCCI

–V

VOL

Output Low Voltage

IOUT = 1,500 µA

0.1VCCI

CIN

Input Pin Capacitance3

–10

CCLK

CLK Pin Capacitance

Notes:

1. This specification should be guaranteed by design. It is the minimum voltage to which pull-up resistors are calculated to pull a

floated network. Designers should ensure that the input buffer is conducting minimum current at this input voltage in applications

sensitive to static power utilization.

2. Input leakage currents include hi-Z output leakage for all bidirectional buffers with tristate outputs.

3. Absolute maximum pin capacitance for a PCI input is 10 pF (except for CLK).

FG256 Datasheet(PDF) 25 Page - Actel Corporation

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