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EPM240T100C5 Datasheet

  • EPM240T100C5

  • CPLD MAX II Family 192 Macro Cells 1879.7MHz 0.18um Technolo...

  • 101頁

  • Altera   Altera

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Chapter 2: MAX II Architecture
I/O Structure
2鈥?9
Table 2鈥?.
MAX II Devices and Speed Grades that Support 3.3-V PCI Electrical Specifications and
Meet PCI Timing
Device
EPM1270
EPM2210
33-MHz PCI
All Speed Grades
All Speed Grades
66-MHz PCI
鈥? Speed Grade
鈥? Speed Grade
Schmitt Trigger
The input buffer for each MAX II device I/O pin has an optional Schmitt trigger
setting for the 3.3-V and 2.5-V standards. The Schmitt trigger allows input buffers to
respond to slow input edge rates with a fast output edge rate. Most importantly,
Schmitt triggers provide hysteresis on the input buffer, preventing slow-rising noisy
input signals from ringing or oscillating on the input signal driven into the logic array.
This provides system noise tolerance on MAX II inputs, but adds a small, nominal
input delay.
The JTAG input pins (TMS,
TCK,
and
TDI)
have Schmitt trigger buffers that are always
enabled.
1
The
TCK
input is susceptible to high pulse glitches when the input signal fall time is
greater than 200 ns for all I/O standards.
Output Enable Signals
Each MAX II IOE output buffer supports output enable signals for tri-state control.
The output enable signal can originate from the
GCLK[3..0]
global signals or from
the MultiTrack interconnect. The MultiTrack interconnect routes output enable signals
and allows for a unique output enable for each output or bidirectional pin.
MAX II devices also provide a chip-wide output enable pin (DEV_OE) to control the
output enable for every output pin in the design. An option set before compilation in
the Quartus II software controls this pin. This chip-wide output enable uses its own
routing resources and does not use any of the four global resources. If this option is
turned on, all outputs on the chip operate normally when
DEV_OE
is asserted. When
the pin is deasserted, all outputs are tri-stated. If this option is turned off, the
DEV_OE
pin is disabled when the device operates in user mode and is available as a user I/O
pin.
Programmable Drive Strength
The output buffer for each MAX II device I/O pin has two levels of programmable
drive strength control for each of the LVTTL and LVCMOS I/O standards.
Programmable drive strength provides system noise reduction control for high
performance I/O designs. Although a separate slew-rate control feature exists, using
the lower drive strength setting provides signal slew-rate control to reduce system
noise and signal overshoot without the large delay adder associated with the
slew-rate control feature.
Table 2鈥?
shows the possible settings for the I/O standards
with drive strength control. The Quartus II software uses the maximum current
strength as the default setting. The PCI I/O standard is always set at 20 mA with no
alternate setting.
漏 October 2008
Altera Corporation
MAX II Device Handbook

EPM240T100C5 產(chǎn)品屬性

  • 270

  • 集成電路 (IC)

  • 嵌入式 - CPLD（復(fù)雜可編程邏輯器件）

  • MAX® II

  • 系統(tǒng)內(nèi)可編程

  • 4.7ns

  • 2.5V，3.3V

  • 240

  • 192

  • -

  • 80

  • 0°C ~ 85°C

  • 表面貼裝

  • 100-TQFP

  • 100-TQFP（14x14）

  • 托盤

  • 544-1146

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