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  3. AR# 8432: Virtex-E: Can we tie Vcco to 2.5 V for LVDS, and have LVTTL inputs?

AR# 8432

Virtex-E: Can we tie Vcco to 2.5 V for LVDS, and have LVTTL inputs?

Description

Keywords: virtex, virtex-e, virtexe, lvds, voltage, lvttl, ttl, input, output, vcc, vcco, tie

Urgency: standard

General Description:

Virtex-E: Can we tie Vcco to 2.5 V for LVDS, and have LVTTL inputs?

Solution

LVTTL input buffers require a VCCO of 3.3V and are incompatible with
the VCCO requirement for LVDS outputs which require 2.5V. The
LVCMOS2 standard requires a VCCO of 2.5V and can be used in the
same bank as LVDS outputs. The LVCMOS2 buffers are 3.3V
tolerant, but with slightly lower Vil and Vih thresholds. For most
applications the LVCMOS2 input thresholds are acceptable.
AR# 8432
Date 10/01/2008
Status Archive
Type General Article

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