XA2C64A-8VQG44Q Datasheet, PDF (14/16 Pages) Xilinx, Inc – Guaranteed to meet full electrical specifications over

XA2C64A CoolRunner-II Automotive CPLD
R
I/O⁽¹⁾
1
I/O⁽¹⁾
2
I/O⁽¹⁾
3
I/O⁽¹⁾
4
VAUX
5
I/O
6
I/O
7
I/O
8
I/O
9
I/O
10
I/O
11
I/O
12
I/O
13
I/O
14
I/O
15
I/O
16
I/O
17
I/O
18
I/O
19
NC
20
GND
21
I/O⁽²⁾
22
I/O⁽²⁾
23
I/O
24
NC
25
VQG100
Top View
75
NC
74
I/O
73
NC
72
I/O
71
I/O
70
I/O
69
GND
68
I/O
67
I/O
66
NC
65
NC
64
I/O
63
NC
62
GND
61
I/O
60
I/O
59
NC
58
I/O
57
Vcc
56
I/O
55
I/O
54
NC
53
I/O
52
I/O
51
V_CCIO1
(1) - Global Output Enable
(2) - Global Clock
(3) - Global Set/Reset
Figure 12: VQ100 Package
CoolRunner-II Automotive Requirements and Recommendations
Requirements
The following requirements are for all automotive applica-
tions:
1. Use a monotonic, fast ramp power supply to power up
CoolRunner-II . A V_CC ramp time of less than 1 ms is
required.
2. Do not float I/O pins during device operation. Floating
I/O pins can increase I_CC as input buffers will draw
1-2 mA per floating input. In addition, when I/O pins are
floated, noise can propagate to the center of the CPLD.
I/O pins should be appropriately terminated with
bus-hold or pull-up. Unused I/Os can also be configured
as C_GND (programmable GND).
3. Do not drive I/O pins without V_CC/V_CCIO powered.
4. Sink current when driving LEDs. Because all Xilinx
CPLDs have N-channel pull-down transistors on
outputs, it is required that an LED anode is sourced
through a resistor externally to V_CC. Consequently, this
will give the brightest solution.
5. Avoid pull-down resistors. Always use external pull-up
resistors if external termination is required. This is
because the CoolRunner-II Automotive CPLD, which
includes some I/O driving circuits beyond the input and
output buffers, may have contention with external
pull-down resistors, and, consequently, the I/O will not
switch as expected.
6. Do not drive I/Os pins above the V_CCIO assigned to its
I/O bank.
a. The current flow can go into V_CCIO and affect a user
voltage regulator.
b. It can also increase undesired leakage current
associated with the device.
14
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DS553 (v1.1) May 5, 2007
Product Specification