EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 252

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

10–4
POR Circuitry
Cyclone III Device Handbook, Volume 1
f
f
1
Cyclone III device family contains POR circuitry to keep the device in a reset state
until the power supply voltage levels have stabilized during power up. During POR,
all user I/O pins are tristated until the V
In addition, the POR circuitry also ensures the V
that contains configuration pins reach an acceptable level before configuration is
triggered.
The POR circuit of the Cyclone III device monitors the V
during power-on. The enhanced POR circuit of the Cyclone III LS device includes
monitoring V
level.
The V
for Cyclone III LS devices only. Cyclone III devices do not have V
After Cyclone III device family enters user mode, the POR circuit continues to
monitor the V
detected. If the V
mode, the POR circuit resets the device. If the V
the POR circuit does not reset the device.
In some applications, it is necessary for a device to wake up very quickly to begin
operation. Cyclone III device family offers the Fast-On feature to support fast
wake-up time applications. For Cyclone III device family, the MSEL[3..0] pin
settings determine the POR time (t
9 ms, while standard POR ranges from 50 ms to 200 ms.
For more information about the MSEL[3..0] pin settings, refer to the
Design Security, and Remote System Upgrades in Cyclone III Devices
For more information about the V
Family Pin Connection
CCBAT
power supply is the new design security feature power supply introduced
CCBAT
CCINT
CCINT
to ensure that V
or V
and V
Guidelines.
CCA
Chapter 10: Hot-Socketing and Power-On Reset in the Cyclone III Device Family
pins so that a brown-out condition during user mode is
CCA
voltage sags below the POR trip point during user
CCBAT
CCBAT
POR
) of the device. Fast POR ranges from 3 ms to
is always at the minimum requirement voltage
pin connection, refer to the
CC
reaches the recommended operating levels.
CCIO
CCIO
voltage sags during user mode,
level of I/O banks 1, 6, 7, and 8
CCINT
© December 2009 Altera Corporation
, V
CCIO
chapter.
CCBAT
Cyclone III Device
, and V
power supply.
Configuration,
CCA
POR Circuitry
pins