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EPM240T100C5N Datasheet

  • EPM240T100C5N

  • MAX II ISP CPLD 240, TQFP100, 240; CPLD Type:FLASH; No. of M...

  • 101頁

  • Altera   Altera

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Chapter 4: Hot Socketing and Power-On Reset in MAX II Devices
Hot Socketing Feature Implementation in MAX II Devices
4鈥?
1
Make sure that the V
CCINT
is within the recommended operating range even though
SRAM download has completed.
Each I/O and clock pin has the circuitry shown in
Figure 4鈥?.
Figure 4鈥?.
Hot Socketing Circuit Block Diagram for MAX II Devices
Power On
Reset
Monitor
V
CCIO
Weak
Pull-Up
Resistor
Output Enable
PAD
Voltage
Tolerance
Control
Hot Socket
Input Buffer
to Logic Array
The POR circuit monitors V
CCINT
and V
CCIO
voltage levels and keeps I/O pins tri-stated
until the device has completed its flash memory configuration of the SRAM logic. The
weak pull-up resistor (R) from the I/O pin to V
CCIO
is enabled during download to
keep the I/O pins from floating. The 3.3-V tolerance control circuit permits the I/O
pins to be driven by 3.3 V before V
CCIO
and/or V
CCINT
are powered, and it prevents the
I/O pins from driving out when the device is not fully powered or operational. The
hot socket circuit prevents I/O pins from internally powering V
CCIO
and V
CCINT
when
driven by external signals before the device is powered.
f
For information about 5.0-V tolerance, refer to the
Using MAX II Devices in Multi-
Voltage Systems
chapter in the
MAX II Device Handbook.
Figure 4鈥?
shows a transistor-level cross section of the MAX II device I/O buffers.
This design ensures that the output buffers do not drive when V
CCIO
is powered before
V
CCINT
or if the I/O pad voltage is higher than V
CCIO
. This also applies for sudden
voltage spikes during hot insertion. The V
PAD
leakage current charges the 3.3-V
tolerant circuit capacitance.
漏 October 2008
Altera Corporation
MAX II Device Handbook

EPM240T100C5N 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

  • 544-1964EPM240T100C5N-ND

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