ALTERA Cyclone III Data sheet

1. Cyclone III Device Datasheet

CIII52001-3.5

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

Electrical Characteristics

The following sections provide information about the absolute maximum ratings, recommended operating conditions, DC characteristics, and other specifications for Cyclone III devices.

Operating Conditions

When Cyclone III devices are implemented in a system, they are rated according to a set of defined parameters. To maintain the highest possible performance and reliability of Cyclone III devices, system designers must consider the operating requirements in this document. Cyclone III devices are offered in commercial, industrial, and automotive grades. Commercial devices are offered in –6 (fastest), –7, and –8 speed grades. Industrial and automotive devices are offered only in –7 speed grade.

1In this chapter, a prefix associated with the operating temperature range is attached to the speed grades; commercial with “C” prefix, industrial with “I” prefix, and automotive with “A” prefix. Commercial devices are therefore indicated as C6, C7, and C8 per respective speed grades. Industrial and automotive devices are indicated as I7 and A7, respectively.

Absolute Maximum Ratings

Absolute maximum ratings define the maximum operating conditions for Cyclone III devices. The values are based on experiments conducted with the device and theoretical modeling of breakdown and damage mechanisms. The functional operation of the device is not implied at these conditions. Table 1–1 lists the absolute maximum ratings for Cyclone III devices.

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Cyclone III Device Handbook

Volume 2

July 2012

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1–2	Chapter 1: Cyclone III Device Datasheet
	Electrical Characteristics

1Conditions beyond those listed in Table 1–1 cause permanent damage to the device. Additionally, device operation at the absolute maximum ratings for extended periods of time has adverse effects on the device.

	Table 1–1. Cyclone III Devices Absolute Maximum Ratings		(1)
	Symbol	Parameter	Min	Max	Unit
	VCCINT	Supply voltage for internal logic	–0.5	1.8	V
	VCCIO	Supply voltage for output buffers	–0.5	3.9	V
	VCCA	Supply voltage (analog) for phase-locked loop	–0.5	3.75	V
		(PLL) regulator
	VCCD_PLL	Supply voltage (digital) for PLL	–0.5	1.8	V
	VI	DC input voltage	–0.5	3.95	V
	IOUT	DC output current, per pin	–25	40	mA
	VESDHBM	Electrostatic discharge voltage using the human	—	±2000	V
		body model
	VESDCDM	Electrostatic discharge voltage using the	—	±500	V
		charged device model
	TSTG	Storage temperature	–65	150	°C
	TJ	Operating junction temperature	–40	125	°C

Note to Table 1–1:

(1)Supply voltage specifications apply to voltage readings taken at the device pins with respect to ground, not at the power supply.

Maximum Allowed Overshoot or Undershoot Voltage

During transitions, input signals may overshoot to the voltage listed in Table 1–2 and undershoot to –2.0 V for a magnitude of currents less than 100 mA and for periods shorter than 20 ns. Table 1–2 lists the maximum allowed input overshoot voltage and the duration of the overshoot voltage as a percentage over the lifetime of the device. The maximum allowed overshoot duration is specified as percentage of high-time over the lifetime of the device.

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Volume 2

Chapter 1: Cyclone III Device Datasheet	1–3
Electrical Characteristics

1A 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

Time Frame		(1)
Symbol		Parameter	Condition	Overshoot Duration as % of High Time	Unit
			VI = 3.95 V	100	%
			VI = 4.0 V	95.67	%
			VI = 4.05 V	55.24	%
			VI = 4.10 V	31.97	%
			VI = 4.15 V	18.52	%
			VI = 4.20 V	10.74	%
Vi		AC Input	VI = 4.25 V	6.23	%
		Voltage	VI = 4.30 V	3.62	%
			VI = 4.35 V	2.1	%
			VI = 4.40 V	1.22	%
			VI = 4.45 V	0.71	%
			VI = 4.50 V	0.41	%
			VI = 4.60 V	0.14	%
			VI = 4.70 V	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

T

T

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	Electrical Characteristics

Recommended Operating Conditions

This section lists the functional operation limits for AC and DC parameters for Cyclone III devices. The steady-state voltage and current values expected from Cyclone III devices are provided in Table 1–3. All supplies must be strictly monotonic without plateaus.

Table 1–3. Cyclone III Devices Recommended Operating Conditions (1), (2)

	Symbol		Parameter	Conditions	Min	Typ	Max	Unit
	VCCINT	(3)	Supply voltage for internal logic	—	1.15	1.2	1.25	V
			Supply voltage for output buffers, 3.3-V	—	3.135	3.3	3.465	V
			operation
			Supply voltage for output buffers, 3.0-V	—	2.85	3	3.15	V
			operation
			Supply voltage for output buffers, 2.5-V	—	2.375	2.5	2.625	V
			operation
	VCCIO	(3), (4)
			Supply voltage for output buffers, 1.8-V	—	1.71	1.8	1.89	V
			operation
			Supply voltage for output buffers, 1.5-V	—	1.425	1.5	1.575	V
			operation
			Supply voltage for output buffers, 1.2-V	—	1.14	1.2	1.26	V
			operation
	VCCA (3)		Supply (analog) voltage for PLL	—	2.375	2.5	2.625	V
			regulator
	VCCD_PLL (3)		Supply (digital) voltage for PLL	—	1.15	1.2	1.25	V
	VI		Input voltage	—	–0.5	—	3.6	V
	VO		Output voltage	—	0	—	VCCIO	V
				For commercial use	0	—	85	°C
	TJ		Operating junction temperature	For industrial use	–40	—	100	°C
				For extended temperature	–40	—	125	°C
				For automotive use	–40	—	125	°C
				Standard power-on reset	50 µs	—	50 ms	—
	tRAMP		Power supply ramp time	(POR) (5)
				Fast POR (6)	50 µs	—	3 ms	—
	IDiode		Magnitude of DC current across	—	—	—	10	mA
			PCI-clamp diode when enabled

Notes to Table 1–3:

(1)VCCIO for all I/O banks must be powered up during device operation. All VCCA pins must be powered to 2.5 V (even when PLLs are not used), and must be powered up and powered down at the same time.

(2)VCCD_PLL must always be connected to VCCINT through a decoupling capacitor and ferrite bead.

(3)The VCC must rise monotonically.

(4)All input buffers are powered by the VCCIO supply.

(5)POR time for Standard POR ranges between 50–200 ms. Each individual power supply should reach the recommended operating range within 50 ms.

(6)POR time for Fast POR ranges between 3–9 ms. Each individual power supply should reach the recommended operating range within 3 ms.

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Chapter 1: Cyclone III Device Datasheet

1–5

Electrical Characteristics

DC Characteristics

This section lists the I/O leakage current, pin capacitance, on-chip termination (OCT) tolerance, and bus hold specifications for Cyclone III devices.

Supply Current

Standby current is the current the device draws after the device is configured with no inputs or outputs toggling and no activity in the device. Use the Excel-based early power estimator (EPE) to get the supply current estimates for your design because these currents vary largely with the resources used. Table 1–4 lists I/O pin leakage current for Cyclone III devices.

fFor more information about power estimation tools, refer to the PowerPlay Early Power Estimator User Guide and the PowerPlay Power Analysis chapter in the Quartus II Handbook.

Table 1–4. Cyclone III Devices I/O Pin Leakage Current (1), (2)

	Symbol	Parameter	Conditions	Min	Typ	Max	Unit
	II	Input pin leakage current	VI = 0 V to VCCIOMAX	–10	—	10	A
	IOZ	Tristated I/O pin leakage	VO = 0 V to VCCIOMAX	–10	—	10	A
		current

Notes to Table 1–4:

(1)This value is specified for normal device operation. The value varies during device power-up. This applies for all VCCIO settings (3.3, 3.0, 2.5, 1.8, 1.5, and 1.2 V).

(2)10 A I/O leakage current limit is applicable when the internal clamping diode is off. A higher current can be the observed when the diode is on.

Bus Hold

Bus hold retains the last valid logic state after the source driving it either enters the high impedance state or is removed. Each I/O pin has an option to enable bus hold in user mode. Bus hold is always disabled in configuration mode.

Table 1–5 lists bus hold specifications for Cyclone III devices.

Table 1–5. Cyclone III Devices Bus Hold Parameter

(Part 1 of 2)

(1)

VCCIO (V)

Parameter

Condition

1.2

1.5

1.8

2.5

3.0

3.3

Unit

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Bus-hold

VIN > VIL

low,

8

—

12

—

30

—

50

—

70

—

70

—

A

sustaining

(maximum)

current

Bus-hold

VIN < VIL

high,

–8

—

–12

—

–30

—

–50

—

–70

—

–70

—

A

sustaining

(minimum)

current

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	Electrical Characteristics

Table 1–5. Cyclone III Devices Bus Hold Parameter							(Part 2 of 2)		(1)
										VCCIO (V)
Parameter	Condition
				1.2		1.5		1.8				2.5		3.0		3.3		Unit
			Min		Max	Min	Max	Min		Max	Min		Max	Min	Max	Min	Max
Bus-hold
low,	0 V < VIN	< VCCIO	—		125	—	175	—		200	—		300	—	500	—	500	A
overdrive
current
Bus-hold
high,	0 V < VIN	< VCCIO	—		–125	—	–175	—		–200	—		–300	—	–500	—	–500	A
overdrive
current
Bus-hold trip	—		0.3		0.9	0.375	1.125	0.68		1.07	0.7		1.7	0.8	2	0.8	2	V
point
Note to Table 1–5:

(1) The bus-hold trip points are based on calculated input voltages from the JEDEC standard.

OCT Specifications

Table 1–6 lists the variation of OCT without calibration across process, temperature, and voltage.

Table 1–6. Cyclone III Devices Series OCT without Calibration Specifications

			Resistance Tolerance
	Description	VCCIO (V)			Unit
			Commercial	Industrial and Automotive
			Max	Max
		3.0	±30	±40	%
	Series OCT without	2.5	±30	±40	%
		1.8	+40	±50	%
	calibration
		1.5	+50	±50	%
		1.2	+50	±50	%

OCT calibration is automatically performed at device power-up for OCT enabled

I/Os.

Table 1–7 lists the OCT calibration accuracy at device power-up.

Table 1–7. Cyclone III Devices Series OCT with Calibration at Device Power-Up Specifications

			Calibration Accuracy
Description	VCCIO (V)				Unit
		Commercial Max		Industrial and Automotive
				Max
	3.0	±10		±10	%
Series OCT with	2.5	±10		±10	%
calibration at device	1.8	±10		±10	%
power-up
	1.5	±10		±10	%
	1.2	±10		±10	%

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Electrical Characteristics

The OCT resistance may vary with the variation of temperature and voltage after calibration at device power-up. Use Table 1–8 and Equation 1–1 to determine the final OCT resistance considering the variations after calibration at device power-up. Table 1–8 lists the change percentage of the OCT resistance with voltage and temperature.

Table 1–8. Cyclone III Devices OCT Variation After Calibration at Device Power-Up

Nominal Voltage	dR/dT (%/°C)	dR/dV (%/mV)
3.0	0.262	–0.026
2.5	0.234	–0.039
1.8	0.219	–0.086
1.5	0.199	–0.136
1.2	0.161	–0.288

Equation 1–1. (1), (2), (3), (4), (5), (6)

RV = (V2 – V1) × 1000 × dR/dV (7)RT = (T2 – T1) × dR/dT (8)

For Rx < 0; MFx = 1/ (| Rx|/100 + 1) (9)

For Rx > 0; MFx = Rx/100 + 1 (10)

MF = MFV × MFT (11)

Rfinal = Rinitial × MF (12)

Notes to Equation 1–1:

(1)T2 is the final temperature.

(2)T1 is the initial temperature.

(3)MF is multiplication factor.

(4)Rfinal is final resistance.

(5)Rinitial is initial resistance.

(6)Subscript × refers to both V and T.

(7)RV is variation of resistance with voltage.

(8)RT is variation of resistance with temperature.

(9)dR/dT is the change percentage of resistance with temperature after calibration at device power-up.

(10)dR/dV is the change percentage of resistance with voltage after calibration at device power-up.

(11)V2 is final voltage.

(12)V1 is the initial voltage.

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	Electrical Characteristics

Example 1–1 shows you the example to calculate the change of 50 I/O impedance from 25°C at 3.0 V to 85°C at 3.15 V:

Example 1–1.

RV = (3.15 – 3) × 1000 × –0.026 = –3.83

RT = (85 – 25) × 0.262 = 15.72 Because RV is negative,

MFV = 1 / (3.83/100 + 1) = 0.963 Because RT is positive,

MFT = 15.72/100 + 1 = 1.157

MF = 0.963 × 1.157 = 1.114

Rfinal = 50 × 1.114 = 55.71

Pin Capacitance

Table 1–9 lists the pin capacitance for Cyclone III devices.

Table 1–9. Cyclone III Devices Pin Capacitance

	Symbol	Parameter	Typical –	Typical –	Unit
			QFP	FBGA
	CIOTB	Input capacitance on top/bottom I/O pins	7	6	pF
	CIOLR	Input capacitance on left/right I/O pins	7	5	pF
	CLVDSLR	Input capacitance on left/right I/O pins with dedicated	8	7	pF
		LVDS output
	CVREFLR	Input capacitance on left/right dual-purpose VREF pin	21	21	pF
	(1)	when used as VREF or user I/O pin
	CVREFTB	Input capacitance on top/bottom dual-purpose VREF pin	23 (2)	23 (2)	pF
	(1)	when used as VREF or user I/O pin
	CCLKTB	Input capacitance on top/bottom dedicated clock input	7	6	pF
		pins
	CCLKLR	Input capacitance on left/right dedicated clock input pins	6	5	pF

Notes to Table 1–9:

(1)When VREF pin is used as regular input or output, a reduced performance of toggle rate and tCO is expected due to higher pin capacitance.

(2)CVREFTB for EP3C25 is 30 pF.

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Electrical Characteristics

Internal Weak Pull-Up and Weak Pull-Down Resistor

Table 1–10 lists the weak pull-up and pull-down resistor values for Cyclone III devices.

Table 1–10.	Cyclone III Devices Internal Weak Pull-Up and Weak Pull-Down Resistor						(1)
Symbol	Parameter			Conditions			Min	Typ	Max	Unit
		VCCIO = 3.3 V ± 5%			(2),	(3)	7	25	41	k
	Value of I/O pin pull-up resistor before	VCCIO = 3.0 V ± 5%			(2),	(3)	7	28	47	k
		VCCIO = 2.5 V ± 5%			(2),	(3)	8	35	61	k
R_PU	and during configuration, as well as
	user mode if the programmable	VCCIO = 1.8 V ± 5%			(2),	(3)	10	57	108	k
	pull-up resistor option is enabled
		VCCIO = 1.5 V ± 5%			(2),	(3)	13	82	163	k
		VCCIO = 1.2 V ± 5%			(2),	(3)	19	143	351	k
		VCCIO = 3.3 V ± 5%			(4)		6	19	30	k
	Value of I/O pin pull-down resistor	VCCIO = 3.0 V ± 5%			(4)		6	22	36	k
R		V	CCIO	= 2.5 V ± 5%	(4)		6	25	43	k
_PD	before and during configuration
		VCCIO = 1.8 V ± 5%			(4)		7	35	71	k
		VCCIO = 1.5 V ± 5%			(4)		8	50	112	k

Notes to Table 1–10:

(1)All I/O pins have an option to enable weak pull-up except configuration, test, and JTAG pin. Weak pull-down feature is only available for JTAG TCK.

(2)Pin pull-up resistance values may be lower if an external source drives the pin higher than VCCIO.

(3)R_PU = (VCCIO – VI)/IR_PU

Minimum condition: –40°C; VCCIO = VCC + 5%, VI = VCC + 5% – 50 mV; Typical condition: 25°C; VCCIO = VCC, VI = 0 V;

Maximum condition: 125°C; VCCIO = VCC – 5%, VI = 0 V; in which VI refers to the input voltage at the I/O pin.

(4)R_PD = VI/IR_PD

Minimum condition: –40°C; VCCIO = VCC + 5%, VI = 50 mV; Typical condition: 25°C; VCCIO = VCC, VI = VCC – 5%;

Maximum condition: 125°C; VCCIO = VCC – 5%, VI = VCC – 5%; in which VI refers to the input voltage at the I/O pin.

Hot Socketing

Table 1–11 lists the hot-socketing specifications for Cyclone III devices.

Table 1–11. Cyclone III Devices Hot-Socketing Specifications

Symbol	Parameter	Maximum
IIOPIN(DC)	DC current per I/O pin	300 A
IIOPIN(AC)	AC current per I/O pin	8 mA (1)

Note to Table 1–11:

(1)The I/O ramp rate is 10 ns or more. For ramp rates faster than 10 ns, |IIOPIN| = C dv/dt, in which C is I/O pin capacitance and dv/dt is the slew rate.

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Schmitt Trigger Input

Cyclone III devices support Schmitt trigger input on 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 signal with slow edge rate. Table 1–12 lists the hysteresis specifications across supported VCCIO range for Schmitt trigger inputs in Cyclone III devices.

Table 1–12. Hysteresis Specifications for Schmitt Trigger Input in Cyclone III Devices

	Symbol	Parameter	Conditions	Minimum	Typical	Maximum	Unit
			VCCIO = 3.3 V	200	—	—	mV
	VSCHMITT	Hysteresis for Schmitt trigger	VCCIO = 2.5 V	200	—	—	mV
		input	VCCIO = 1.8 V	140	—	—	mV
			VCCIO = 1.5 V	110	—	—	mV

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 III devices. Table 1–13 through Table 1–18 provide the I/O standard specifications for Cyclone III devices.

Table 1–13. Cyclone III Devices Single-Ended I/O Standard Specifications (1), (2)

I/O Standard		VCCIO (V)			VIL (V)			VIH (V)		VOL (V)	VOH (V)	IOL	IOH
	Min	Typ		Max	Min	Max	Min		Max	Max	Min	(mA)	(mA)
3.3-V LVTTL (3)	3.135	3.3		3.465	—	0.8	1.7		3.6	0.45	2.4	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	–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	–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 LVTTL and	2.375	2.5		2.625	–0.3	0.7	1.7		3.6	0.4	2.0	1	–1
LVCMOS (3)
1.8-V LVTTL and	1.71	1.8		1.89	–0.3	0.35 *	0.65 *		2.25	0.45	VCCIO –	2	–2
LVCMOS						VCCIO	VCCIO				0.45
1.5-V LVCMOS	1.425	1.5		1.575	–0.3	0.35 *	0.65 *		VCCIO + 0.3	0.25 *	0.75 *	2	–2
						VCCIO	VCCIO			VCCIO	VCCIO
1.2-V LVCMOS	1.14	1.2		1.26	–0.3	0.35 *	0.65 *		VCCIO + 0.3	0.25 *	0.75 *	2	–2
						VCCIO	VCCIO			VCCIO	VCCIO
3.0-V PCI	2.85	3.0		3.15	—	0.3 *	0.5 *		VCCIO + 0.3	0.1 * VCCIO	0.9 * VCCIO	1.5	–0.5
						VCCIO	VCCIO
3.0-V PCI-X	2.85	3.0		3.15	—	0.35*	0.5 *		VCCIO + 0.3	0.1 * VCCIO	0.9 * VCCIO	1.5	–0.5
						VCCIO	VCCIO

Notes to Table 1–13:

(1)For voltage referenced receiver input waveform and explanation of terms used in Table 1–13, refer to “Single-ended Voltage referenced I/O Standard” in “Glossary” on page 1–27.

(2)AC load CL = 10 pF.

(3)For more detail about interfacing Cyclone III devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O standards, refer to AN 447: Interfacing Cyclone III Devices with 3.3/3.0/2.5-V LVTTL and LVCMOS I/O Systems.

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Electrical Characteristics

Table 1–14. Cyclone III Devices Single-Ended SSTL and HSTL I/O Reference Voltage Specifications																(1)
I/O	V		CCIO	(V)					V	REF	(V)					V	TT	(V) (2)
Standard	Min		Typ			Max	Min			Typ			Max		Min		Typ		Max
SSTL-2	2.375		2.5			2.625	1.19			1.25			1.31		VREF –		VREF		VREF +
Class I, II															0.04				0.04
SSTL-18	1.7		1.8			1.9	0.833			0.9			0.969		VREF –		VREF		VREF +
Class I, II															0.04				0.04
HSTL-18	1.71		1.8			1.89	0.85			0.9			0.95		0.85		0.9		0.95
Class I, II
HSTL-15	1.425		1.5			1.575	0.71			0.75			0.79		0.71		0.75		0.79
Class I, II
HSTL-12	1.14		1.2			1.26	0.48 * VCCIO	(3)	0.5 * VCCIO			(3)	0.52 * VCCIO	(3)	—	0.5 *			—
Class I, II							0.47 * VCCIO	(4)	0.5 * VCCIO			(4)	0.53 * VCCIO	(4)		VCCIO

Notes to Table 1–14:

(1)For an explanation of terms used in Table 1–14, refer to “Glossary” on page 1–27.

(2)VTT of transmitting device must track VREF of the receiving device.

(3)Value shown refers to DC input reference voltage, VREF(DC).

(4)Value shown refers to AC input reference voltage, VREF(AC).

Table 1–15. Cyclone III Devices Single-Ended SSTL and HSTL I/O Standards Signal Specifications

	I/O	VIL(DC) (V)			VIH(DC) (V)			VIL(AC) (V)			VIH(AC) (V)		VOL (V)	VOH (V)		IOL	IOH
	Standard	Min	Max	Min		Max		Min	Max	Min		Max	Max	Min		(mA)	(mA)
	SSTL-2	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	VTT –	VTT +		8.1	–8.1
	Class I		0.18	0.18					0.35	0.35			0.57	0.57
	SSTL-2	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	VTT –	VTT +		16.4	–16.4
	Class II		0.18	0.18					0.35	0.35			0.76	0.76
	SSTL-18	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	VTT –	VTT +		6.7	–6.7
	Class I		0.125	0.125					0.25	0.25			0.475	0.475
	SSTL-18	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	0.28	VCCIO	–	13.4	–13.4
	Class II		0.125	0.125					0.25	0.25				0.28
	HSTL-18	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	0.4	VCCIO	–	8	–8
	Class I		0.1	0.1					0.2	0.2				0.4
	HSTL-18	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	0.4	VCCIO	–	16	–16
	Class II		0.1	0.1					0.2	0.2				0.4
	HSTL-15	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	0.4	VCCIO	–	8	–8
	Class I		0.1	0.1					0.2	0.2				0.4
	HSTL-15	—	VREF –	VREF	+	—		—	VREF –	VREF	+	—	0.4	VCCIO	–	16	–16
	Class II		0.1	0.1					0.2	0.2				0.4
	HSTL-12	–0.15	VREF –	VREF	+	VCCIO	+ 0.15	–0.24	VREF –	VREF +		VCCIO +	0.25 ×	0.75 ×		8	–8
	Class I		0.08	0.08					0.15	0.15		0.24	VCCIO	VCCIO
	HSTL-12	–0.15	VREF –	VREF	+	VCCIO	+ 0.15	–0.24	VREF –	VREF +		VCCIO +	0.25 ×	0.75 ×		14	–14
	Class II		0.08	0.08					0.15	0.15		0.24	VCCIO	VCCIO

July 2012 Altera Corporation	Cyclone III Device Handbook
	Volume 2