參數資料
型號： PXA270
廠商： Intel Corp.
英文描述： Electrical, Mechanical, and Thermal Specification
中文描述： 電氣，機械和熱規(guī)格
文件頁數： 65/126頁
文件大小： 1563K
代理商： PXA270
Electrical, Mechanical, and Thermal Specification
6-1
AC Timing Specifications
6
A pin’s alternating-current (AC) characteristics include input and output capacitance. These factors
determine the loading for external drivers and other load analyses. The AC characteristics also
include a derating factor, which indicates how much the AC timings might vary with different
loads.
Note:
The timing diagrams in this chapter show bursts that start at 0 and proceed to 3 or 7. However, the
least significant address (0) is not always received first during a burst transfer, because the Intel
PXA270 processor requests the critical word first during burst accesses.
Table 6-1
shows the AC operating conditions for the high- and low-strength input, output, and I/O
pins. All AC specification values are valid for the device’s entire temperature range.
6.1
AC Test Load Specifications
Figure 6-1
represents the timing reference load used in defining the relevant timing parameters of
the part. It is not intended to be either a precise representation of the typical system environment
nor a depiction of the actual load presented by a production tester. System designers use IBIS or
other simulation tools to correlate the timing reference load to system environment. Manufacturers
correlate to their production test conditions (generally a coaxial transmission line terminated at the
tester electronics).
Table 6-1. Standard Input, Output, and I/O-Pin AC Operating Conditions
Symbol
Description
Min
Typical
Max
Units
C
IN
Input capacitance, all standard input and
I/O pins
—
—
10
pf
C
OUT_H
Output capacitance, all standard high-
strength output and I/O pins
20
—
50
pf
td
F_H
Output derating, falling edge on all
standard, high-strength output and I/O
pins, from 50-pf load.
—
TBD
—
ns/pf
td
R_H
Output derating, rising edge on all
standard, high-strength output and I/O
pins, from 50-pf load.
—
TBD
—
ns/pf
C
OUT_L
Output capacitance, all standard low-
strength output and I/O pins
20
—
50
pf
td
F_L
Output derating, falling edge on all
standard, low-strength output and I/O
pins, from 50-pf load.
—
TBD
—
ns/pf
td
R_L
Output derating, rising edge on all
standard, low-strength output and I/O
pins, from 50-pf load.
—
TBD
—
ns/pf
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