Chapter 1: Cyclone IV Device Datasheet

1–33

Switching Characteristics

May 2013

Altera Corporation

Cyclone IV Device Handbook,

Volume 3

planning, IP implementation, and device termination, refer to Section III: System

Performance Specifications of the External Memory Interface Handbook.

Table 1–37 lists the memory output clock jitter specifications for Cyclone IV devices.

Duty Cycle Distortion Specifications

Table 1–38 lists the worst case duty cycle distortion for Cyclone IV devices.

OCT Calibration Timing Specification

Table 1–39 lists the duration of calibration for series OCT with calibration at device

power-up for Cyclone IV devices.

Table 1–37. Memory Output Clock Jitter Specifications for Cyclone IV Devices (1), (2)

Parameter

Symbol

Min

Max

Unit

Clock period jitter

–125

125

ps

Cycle-to-cycle period jitter

–200

200

ps

Duty cycle jitter

–150

150

ps

Notes to Table 1–37:

(1) Memory output clock jitter measurements are for 200 consecutive clock cycles, as specified in the JEDEC DDR2

standard.

(2) The clock jitter specification applies to memory output clock pins generated using DDIO circuits clocked by a PLL

output routed on a global clock (GCLK) network.

Table 1–38. Duty Cycle Distortion on Cyclone IV Devices I/O Pins (1), (2), (3)

Symbol

C6

C7, I7

C8, I8L, A7

C9L

Unit

Min

Max

Min

Max

Min

Max

Min

Max

Output Duty Cycle

45

55

455545554555

%

Notes to Table 1–38:

(1) The duty cycle distortion specification applies to clock outputs from the PLLs, global clock tree, and IOE driving the dedicated and general

purpose I/O pins.

(2) Cyclone IV devices meet the specified duty cycle distortion at the maximum output toggle rate for each combination of I/O standard and current

strength.

(3) Cyclone IV E 1.0 V core voltage devices only support C8L, C9L, and I8L speed grades. Cyclone IV E 1.2 V core voltage devices only support

C6, C7, C8, I7, and A7 speed grades. Cyclone IV GX devices only support C6, C7, C8, and I7 speed grades.

Table 1–39. Timing Specification for Series OCT with Calibration at Device Power-Up for

Cyclone IV Devices (1)

Symbol

Description

Maximum

Units

Duration of series OCT with

calibration at device power-up

20

µs

Note to Table 1–39:

(1) OCT calibration takes place after device configuration and before entering user mode.