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XR17D158
xr
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
REV. 1.2.2
58
AC ELECTRICAL CHARACTERISTICS FOR 5V PCI BUS INTERFACE
(VIO = 4.75-5.25V, VCC = 4.5 - 5.5V), TA=0o to 70oC (-40o to +85oC for industrial grade package).
SYMBOL
PARAMETER
MIN
MAX
UNITS
NOTES
XTAL1
UART Crystal Oscillator
24
MHz
ECLK
External Clock
50
MHz
TECLK
External Clock Time
Period
20
ns
TECLK = 1/ECLK
TECH, TECL External Clock High/Low
Time
8
ns
IOH(AC)
Switching Current High
-44
mA
See PCI Specifica-
tion Rev. 2.3
IOL(AC)
Switching Current Low
95
mA
See PCI Specifica-
tion Rev. 2.3
ICL
Low Clamp Current
-25+(Vin+1)/0.015
mA
-5 < Vin
≤ -1
SlewR
Output Rise Slew Rate
1
4
V/ns
0.4V to 2.4V load
SlewF
Output Fall Slew Rate
1
4
V/ns
2.4V to 0.4V load
TCYC
CLK Cycle Time
30
∞
ns
PCI Bus Clock, CLK
THI
CLK High Time
11
ns
TLO
CLK Low Time
11
ns
CLK Slew Rate
1
4
V/ns
TVAL
CLK to Signal Valid Delay
2
11
ns
TON
Float to Active Delay
2
ns
TOFF
Active to Float Delay
28
ns
TSETUP
Input Setup Time to CLK -
bused signals
7
ns
THOLD
Input Hold Time from CLK
0
ns
TPRST
RST# Active Time After
Power Stable
1
ms
TCRST#
RST# Active Time After
CLK Stable
100
us
RST# Slew Rate
50
mV/ns