R
XCR3064A: 64 Macrocell CPLD With Enhanced Clocking
Switching Characteristics
The test load circuit and load values for the AC Electrical Characteristics are illustrated below.
V
CC
S1
Component
R1
R2
R1
Values
390Ω
390Ω
35pF
C1
V
IN
V
OUT
Measurement
R2
C1
S1
Open
Closed
Closed
S2
Closed
Open
Closed
t
PZH
t
PZL
t
P
S2
NOTE:
For t
PHZ
and t
PLZ
C = 5 pF, and 3-state levels are
measured 0.5V from steady-state active level.
SP00461B
5.9
V
CC
= 3.3 V, 25°C
+3.0V
90%
5.8
10%
0V
5.7
t
R
1.5ns
t
F
1.5ns
5.6
t
PD_PAL
(ns)
5.5
SP00368
MEASUREMENTS:
All circuit delays are measured at the +1.5V level of
inputs and outputs, unless otherwise specified.
Input Pulses
5.4
Figure 7: Voltage Waveform
5.3
Table 6: t
PD_PAL
vs # of Outputs Switching
(V
CC
= 3.3 V, T = 25°C)
# of Outputs
Typical (ns)
1
5.3
2
5.3
4
5.4
8
5.6
12
5.7
16
5.9
5.2
1
2
4
8
12
16
NUMBER OF OUTPUTS SWITCHING
SP00639
Figure 6: t
PD_PAL
vs. Output Switching
DS037 (v1.1) February 10, 2000
www.xilinx.com
1-800-255-7778
14
XILINX [ XILINX, INC ]
