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Single-Ended I/O Standards in Stratix II Devices

Stratix® II devices support a variety of single-ended I/O standards, including LVTTL, LVCMOS, SSTL, HSTL, PCI, and PCI-X standards. This enables Stratix II devices to easily interface with backplanes, host processors, buses, memory devices, and other board devices. Single-ended systems provide more current drive capacity than differential I/O standards, and they are critical when working with advanced memory devices such as DDR SDRAM, DDR2 SDRAM, RLDRAM II, and QDRII SRAM devices. Table 1 lists the single-ended I/O standards supported in Stratix II devices.

Table 1. Stratix II Device Single-Ended I/O Standard Support
I/O Standard Performance Target Typical Application
3.3-V/2.5-V LVTTL
1.8-V LVTTL
300 MHz
250 MHz
General Purpose
SDR SDRAM
3.3-V/2.5-V LVCMOS
1.8-V LVCMOS
1.5-V LVCMOS
300 MHz
250 MHz
200 MHz
General Purpose
SSTL-2 Class I and II 200 MHz DDR SDRAM
RLDRAM II
SSTL-18 Class I and II 333 MHz DDR2 SDRAM
1.8-V HSTL Class I and II 300 MHz QDR II SRAM
RLDRAM II
1.5-V HSTL Class I and II 250 MHz Memory and Switch Fabric
3.3-V PCI 66 MHz PC and Embedded
3.3-V PCI-X 133 MHz PC and Embedded
Differential SSTL-2 Class I and II 200 MHz Memory and Switch Fabric
Differential SSTL-18 Class I and II 333 MHz DDR2 SDRAM
Differential 1.8-V HSTL Class I and II 300 MHz

QDR II SRAM
RLDRAM II

Differential 1.5-V HSTL Class I and II 250 MHz Memory and Switch Fabric

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