EP4CE115 datasheet(12/42 Pages) ALTERA

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Chapter 1: Cyclone IV Device Datasheet

Operating Conditions

Cyclone IV Device Handbook,

May 2013

Altera Corporation

Volume 3

Schmitt Trigger Input

Cyclone IV devices support Schmitt trigger input on the TDI, TMS, TCK, nSTATUS,

nCONFIG

, nCE, CONF_DONE, and DCLK pins. A Schmitt trigger feature introduces

hysteresis to the input signal for improved noise immunity, especially for signals with

slow edge rate. Table 1–14 lists the hysteresis specifications across the supported

VCCIO range for Schmitt trigger inputs in Cyclone IV devices.

I/O Standard Specifications

The following tables list input voltage sensitivities (VIH and VIL), output voltage (VOH

and VOL), and current drive characteristics (IOH and IOL), for various I/O standards

supported by Cyclone IV devices. Table 1–15 through Table 1–20 provide the I/O

standard specifications for Cyclone IV devices.

Table 1–14. Hysteresis Specifications for Schmitt Trigger Input in Cyclone IV Devices

Symbol

Parameter

Conditions (V)

Minimum

Unit

VSCHMITT

Hysteresis for Schmitt trigger

input

VCCIO =3.3

200

VCCIO =2.5

200

VCCIO =1.8

140

VCCIO =1.5

110

Table 1–15. Single

-Ended I/O Standard Specifications for Cyclone IV Devices (1), (2)

I/O Standard

VCCIO (V)

VIL (V)

VIH (V)

VOL (V)

VOH (V)

IOL

(mA)

(4)

IOH

(mA)

(4)

Min

Typ

Max

Min

Max

Min

Max

Min

3.3

-V LVTTL (3)

3.135

3.3

3.465

—

0.8

1.7

3.6

0.45

2.4

–4

3.3

-V LVCMOS (3)

3.135

3.3

3.465

—

0.8

1.7

3.6

0.2

VCCIO – 0.2

–2

3.0

-V LVTTL (3)

2.85

3.0

3.15

–0.3

0.8

1.7

VCCIO + 0.3

0.45

2.4

–4

3.0

-V LVCMOS (3)

2.85

3.0

3.15

–0.3

0.8

1.7

VCCIO + 0.3

0.2

VCCIO – 0.2

0.1

–0.1

2.5 V (3)

2.375

2.5

2.625

–0.3

0.7

1.7

VCCIO + 0.3

0.4

2.0

–1

1.8 V

1.71

1.8

1.89

–0.3

0.35 x

VCCIO

0.65 x

VCCIO

2.25

0.45

VCCIO –

0.45

2–2

1.5 V

1.425

1.5

1.575

–0.3

0.35 x

VCCIO

0.65 x

VCCIO

VCCIO + 0.3

0.25 x

VCCIO

0.75 x

VCCIO

2–2

1.2 V

1.14

1.2

1.26

–0.3

0.35 x

VCCIO

0.65 x

VCCIO

VCCIO + 0.3

0.25 x

VCCIO

0.75 x

VCCIO

2–2

3.0-V PCI

2.85

3.0

3.15

—

0.3 x

VCCIO

0.5 x

VCCIO

VCCIO + 0.3 0.1 x VCCIO

0.9 x VCCIO

1.5

–0.5

3.0-V PCI-X

2.85

3.0

3.15

—

0.35 x

VCCIO

0.5 x

VCCIO

VCCIO + 0.3 0.1 x VCCIO

0.9 x VCCIO

1.5

–0.5

Notes to Table 1–15:

(1) For voltage

-referenced receiver input waveform and explanation of terms used in Table 1–15, refer to “Glossary” on page 1–37.

(2) AC load CL = 10 pF

(3) For more information about interfacing Cyclone IV devices with 3.3/3.0/2.5

-V LVTTL/LVCMOS I/O standards, refer to AN 447: Interfacing Cyclone III

and Cyclone IV Devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O Systems.

(4) To meet the IOL and IOH specifications, you must set the current strength settings accordingly. For example, to meet the 3.3-V LVTTL specification (4

mA), set the current strength settings to 4 mA or higher. Setting at lower current strength may not meet the IOLand IOHspecifications in the handbook.

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