參數(shù)資料
型號： PC8245
廠商： Atmel Corp.
英文描述： Integrated Processor Family
中文描述： 綜合處理器系列
文件頁數(shù)： 24/61頁
文件大?。?/td> 429K
代理商： PC8245
24
PC8245
2171D–HIREL–06/04
Output Driver
Characteristic
Table 5 on page 24 provides information on the characteristics of the output drivers ref-
erenced in Table 1 on page 6. The values are preliminary estimates from an IBIS model
and are not tested
.
Notes:
1. For DRV_PCI, I
OH
read from the IBIS listing in the pull-up mode, I(Min) column, at the 0.33V label by interpolating between
the 0.3V and 0.4V table entries’ current values which corresponds to the PCI V
OH
= 2.97 = 0.9
×
OV
DD
(OV
DD
= 3.3V) where
table entry voltage = OV
DD
–
PCI V
OH
.
2. For all others with GV
DD
or OV
DD
= 3.3V, I
OH
read from the IBIS listing in the pull-up mode, I(Min) column, at the 0.9V table
entry which corresponds to the V
OH
= 2.4V where table entry voltage = GV
DD
/OV
DD
–
V
OH
.
3. For DRV_PCI, I
OL
read from the IBIS listing in the pull-down mode, I(Min) column, at 0.33V = PCI V
OL
= 0
×
OV
DD
(OV
DD
=
3.3V) by interpolating between the 0.3V and 0.4V table entries.
4. For all others with GV
DD
or OV
DD
= 3.3V, I
OL
read from the IBIS listing in the pull-down mode, I(Min) column, at the 0.4V table
entry.
5. See driver bit details for output driver control register (0x72) in the "MPC8245 Integrated Processor User’s Manual".
6. See Chip Errata No. 19 in the PC8245/PC8241 RISC Microprocessor Chip Errata’s Motorola.
AC Electrical
Characteristics
This section provides the AC electrical characteristics for the PC8245. After fabrication,
functional parts are sorted by maximum processor core frequency as shown in Table 6
and tested for conformance to the AC specifications for that frequency. The processor
core frequency is determined by the bus (PCI_SYNC_IN) clock frequency and the set-
tings of the PLL_CFG[0:4] signals. Parts are sold by maximum processor core
frequency. See “Ordering Information” on page 56.
Table 7 provides the operating frequency information for the PC8245 at recommended
operating conditions (see Table “Recommended Operating Conditions” on page 12)
with L
V
DD
= 3.3V ± 0.3V.
Table 5.
Drive Capability of PC8245 Output Pins
(5)
Driver Type
Programmable Output
Impedance (
)
Supply Voltage (V)
I
OH
I
OL
Unit
Notes
DRV_STD_MEM
20
OV
DD
= 3.3V
36.6
18.0
mA
(2)(4)(6)
40 (default)
18.6
9.2
mA
(2)(4)(6)
DRV_PCI
20
12.0
12.4
mA
(1)(3)
40 (default)
6.1
6.3
mA
(1)(3)
DRV_MEM_CTRL
DRV_PCI_CLK
DRV_MEM_CLK
6 (default)
GV
DD
= 3.3V
89.0
42.3
mA
(2)(4)
20
36.6
18.0
mA
(2)(4)
40
18.6
9.2
mA
(2)(4)
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