XR17D154
xr
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
REV. 1.2.0
AC ELECTRICAL CHARACTERISTICS FOR 3.3V PCI BUS INTERFACE (VIO = 3.0-3.6V, VCC = 3.0-5.5V)
TA=0o to 70oC (-40o to +85oC for industrial grade package).
SYMBOL
PARAMETER
UART Crystal Oscillator
External Clock
MIN
MAX
24
UNITS
MHz
MHz
MHz
ns
NOTES
XTAL1
On-chip osc.
ECLK
33
VCC = 3.3V 10%
VCC = 5V 10%
VCC = 3.3V 10%
VCC = 5V 10%
VCC = 3.3V 10%
VCC = 5V 10%
50
TECLK
External Clock Period
(TECLK = 1/ECLK)
30
20
ns
TECH, TECL External Clock High/Low
Time
13
ns
8
ns
IOH(AC)
Switching Current High
Switching Current Low
-12VIO
mA
See PCI Specification
Rev. 2.3
IOL(AC)
16VIO
mA
See PCI Specification
Rev. 2.3
ICH
High Clamp Current
Low Clamp Current
Output Rise Slew Rate
Output Fall Slew Rate
CLK Cycle Time
25+(Vin-VIO-1)/0.015
mA
mA
VIO+4 > Vin ≥ VIO+1
-3 < Vin ≤ -1
ICL
-25+(Vin+1)/0.015
SlewR
SlewF
TCYC
1
1
4
4
V/ns
V/ns
ns
0.2VIO - 0.6VIO load
0.6VIO - 0.2VIO load
PCI Bus Clock, CLK
30
∞
THI
CLK High Time
CLK Low Time
11
11
ns
ns
TLO
CLK Slew Rate
1
2
4
V/ns
ns
TVAL
CLK to Signal Valid Delay
11
TON
Float to Active Delay
Active to Float Delay
2
ns
ns
ns
TOFF
TSETUP
28
Input Setup Time to CLK -
bused signals
7
THOLD
TPRST
Input Hold Time from CLK
0
1
ns
RST# Active Time After
Power Stable
ms
TCRST#
RST# Active Time After CLK
Stable
100
50
us
RST# Slew Rate
mV/ns
56
EXAR [ EXAR CORPORATION ]
