Altera Corporation
65
APEX 20K Programmable Logic Device Family Data Sheet
1
For DC Operating Specifications on APEX 20KE I/O standards,
please refer to Application Note 117 (Using Selectable I/O Standards
in Altera Devices).
(1)
See the Operating Requirements for Altera Devices Data Sheet. (2)
Minimum DC input is –0.5 V. During transitions, the inputs may undershoot to –2.0 V or overshoot to 5.75 V for
input currents less than 100 mA and periods shorter than 20 ns.
(3)
Numbers in parentheses are for industrial-temperature-range devices.
(4)
Maximum VCC rise time is 100 ms, and VCC must rise monotonically.
(5)
Minimum DC input is –0.5 V. During transitions, the inputs may undershoot to –2.0 V or overshoot to the voltage
shown in the following table based on input duty cycle for input currents less than 100 mA. The overshoot is
dependent upon duty cycle of the signal. The DC case is equivalent to 100% duty cycle.
Vin
Max. Duty Cycle
4.0V
100% (DC)
4.1
90%
4.2
50%
4.3
30%
4.4
17%
4.5
10%
(6)
All pins, including dedicated inputs, clock, I/O, and JTAG pins, may be driven before VCCINT and VCCIO are
powered.
(7)
Typical values are for TA = 25° C, VCCINT = 1.8 V, and VCCIO = 1.8 V, 2.5 V or 3.3 V.
(8)
These values are specified under the APEX 20KE device recommended operating conditions, shown in
Table 24 on(9)
Refer to Application Note 117 (Using Selectable I/O Standards in Altera Devices) for the VIH, VIL, VOH, VOL, and II
parameters when VCCIO = 1.8 V.
(10) The APEX 20KE input buffers are compatible with 1.8-V, 2.5-V and 3.3-V (LVTTL and LVCMOS) signals.
Additionally, the input buffers are 3.3-V PCI compliant. Input buffers also meet specifications for GTL+, CTT, AGP,
SSTL-2, SSTL-3, and HSTL.
(11) The IOH parameter refers to high-level TTL, PCI, or CMOS output current.
(12) The IOL parameter refers to low-level TTL, PCI, or CMOS output current. This parameter applies to open-drain pins
as well as output pins.
(13) This value is specified for normal device operation. The value may vary during power-up.
(14) Pin pull-up resistance values will be lower if an external source drives the pin higher than VCCIO.
(15) Capacitance is sample-tested only.
Figure 33 shows the relationship between VCCIO and VCCINT for 3.3-V PCI compliance on APEX 20K devices.
Table 30. APEX 20KE Device Capacitance
Symbol
Parameter
Conditions
Min
Max
Unit
CIN
Input capacitance
VIN = 0 V, f = 1.0 MHz
8
pF
CINCLK
Input capacitance on
dedicated clock pin
VIN = 0 V, f = 1.0 MHz
12
pF
COUT
Output capacitance
VOUT = 0 V, f = 1.0 MHz
8
pF