R
XQ4000E IOB Input Switching Characteristic Guidelines
Testing of switching parameters is modeled after testing
methods specified by MIL-M-38510/605. All devices are
100% functionally tested. Pin-to-pin timing parameters are
derived from measuring external and internal test patterns
and are guaranteed over worst-case operating conditions
(supply voltage and junction temperature). Listed below are
representative values for typical pin locations and normal
clock loading. For more specific, more precise, and
worst-case guaranteed data, reflecting the actual routing
structure, use the values provided by the static timing ana-
lyzer (TRCE in the Xilinx Development System) and
back-annotated to the simulation netlist. These path delays,
provided as a guideline, have been extracted from the static
timing analyzer report. Values apply to all XQ4000E devices
unless otherwise noted.
Symbol
Propagation Delays (TTL Inputs)
(1)
Description
Device
-3
-4
Units
Min
Max
Min
Max
T
PID
T
PLI
T
PDLI
Pad to I1, I2
All devices
-
2.5
-
3.0
ns
Pad to I1, I2 via transparent input latch, no delay
All devices
-
3.6
-
4.8
ns
Pad to I1, I2 via transparent FCL and input latch,
with delay
XQ4005E
-
-
-
10.8
ns
XQ4010E
-
10.8
-
11.0
ns
XQ4013E
-
11.2
-
11.4
ns
XQ4025E
-
-
-
13.8
ns
Propagation Delays (CMOS Inputs)
(1)
T
PIDC
T
PLIC
T
PDLIC
Pad to I1, I2
All devices
-
4.1
-
5.5
ns
Pad to I1, I2 via transparent input latch, no delay
All devices
-
8.8
-
6.8
ns
Pad to I1, I2 via transparent FCL and input latch,
with delay
XQ4005E
-
-
-
16.5
ns
XQ4010E
-
14.0
-
17.5
ns
XQ4013E
-
14.4
-
18.0
ns
XQ4025E
-
-
-
20.8
ns
Propagation Delays (TTL Inputs)
T
IKRI
T
IKLI
Hold Times
(2)
Clock (IK) to I1, I2 (flip-flop)
All devices
-
2.8
-
5.6
ns
Clock (IK) to I1, I2 (latch enable, active Low)
All devices
-
4.0
-
6.2
ns
T
IKPI
T
IKPID
T
IKEC
T
IKECD
Notes:
1.
Input pad setup and hold times are specified with respect to the internal clock (IK). For setup and hold times with respect to the clock
input pin, see the pin-to-pin parameters in the Guaranteed Input and Output Parameters table.
2.
Voltage levels of unused pads, bonded or unbonded, must be valid logic levels. Each can be configured with the internal pull-up
(default) or pull-down resistor, or configured as a driven output, or can be driven from an external source.
Pad to clock (IK), no delay
All devices
0
-
0
-
ns
Pad to clock (IK), with delay
All devices
0
-
0
-
ns
Clock enable (EC) to clock (K), no delay
All devices
1.5
-
1.5
-
ns
Clock enable (EC) to clock (K), with delay
All devices
0
-
0
-
ns