參數(shù)資料
型號: Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 85/115頁
文件大小: 846K
代理商: ALPHA 21164
Electrical Data
85
AC Characteristics
11.3.3 AC Coupling
Using series coupling (blocking) capacitors renders the 21164 clock input pins insen-
sitive to the oscillator’s dc level. When connected this way, oscillators with any dc
offset relative to
Vss
can be used provided they can drive a signal into the
osc_clk_in_h,l
pins with a peak-to-peak level of at least 600 mV, but no greater than
3.0 V peak-to-peak.
The value of the coupling capacitor is not overly critical. However, it should be suf-
ficiently low impedance at the clock frequency so that the oscillator’s output signal
(when measured at the
osc_clk_in_h,l
pins) is not attenuated below the 600-mV,
peak-to-peak lower limit. For sine waves or oscillators producing nearly sinusoidal
(pseudo square wave) outputs, 220 pF is recommended at 433 MHz. A high-quality
dielectric such as NPO is required to avoid dielectric losses.
Table 26 shows the input clock specification.
11.4 AC Characteristics
This section describes the ac timing specifications for the 21164.
11.4.1 Test Configuration
All input timing is specified relative to the crossing of standard TTL input levels of
0.8 V and 2.0 V. Output timing is to the nominal CMOS switch point of
Vdd/
2 (see
Figure 15).
Because the speed and complexity of microprocessors has increased substantially
over the years, it is necessary to change the way they are tested. Traditional assump-
tions that all loads can be lumped into some accumulation of capacitance cannot be
employed any more. Rather, the model of a transmission line with discrete loads is a
much more realistic approach for current test technology.
1
Minimum clock frequency = 300 MHz for devices
433 MHz
Minimum clock frequency = 440 MHz for devices
466 MHz
Maximum clock frequency = 600 MHz = 1/Tcycle
Table 26 Input Clock Specification
Signal Parameter
Nominal Bin
1
Unit
osc_clk_in_h,l
symmetry
50 ± 10
%
osc_clk_in_h,l
minimum voltage
0.6
V (peak-to-peak)
osc_clk_in_h,l
Z input
50
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