XR17D154
xr
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
REV. 1.2.0
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
UART Crystal Oscillator
External Clock
MIN
MAX
UNITS
NOTES
XTAL1
24
MHz
ECLK
TECLK
50
MHz
ns
External Clock Period
20
8
TECLK = 1/ECLK
T
ECH, TECL External Clock High/Low
Time
ns
IOH(AC)
-44
95
mA
mA
Switching Current High
See PCI Specifica-
tion Rev. 2.3
IOL(AC)
Switching Current Low
Low Clamp Current
See PCI Specifica-
tion Rev. 2.3
ICL
-25+(Vin+1)/0.015
mA
V/ns
V/ns
ns
-5 < Vin ≤ -1
0.4V to 2.4V load
2.4V to 0.4V load
PCI Bus Clock, CLK
SlewR
SlewF
TCYC
THI
1
1
4
4
Output Rise Slew Rate
Output Fall Slew Rate
CLK Cycle Time
30
11
11
1
∞
ns
CLK High Time
TLO
ns
CLK Low Time
4
V/ns
ns
CLK Slew Rate
TVAL
2
11
CLK to Signal Valid Delay
Float to Active Delay
Active to Float Delay
TON
2
ns
TOFF
TSETUP
28
ns
7
0
ns
Input Setup Time to CLK -
bused signals
THOLD
ns
Input Hold Time from CLK
TPRST
1
ms
us
RST# Active Time After
Power Stable
TCRST#
100
50
RST# Active Time After
CLK Stable
mV/ns
RST# Slew Rate
54
EXAR [ EXAR CORPORATION ]
