XR17D154 Datasheet, PDF (54/69 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART

XR17D154
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
xr
REV. 1.2.0
AC ELECTRICAL CHARACTERISTICS FOR 5V PCI BUS INTERFACE (VIO = 4.75-5.25V, VCC = 4.5-5.5V)
TA=0^o to 70^oC (-40^o to +85^oC for industrial grade package).
SYMBOL
PARAMETER
MIN
XTAL1
UART Crystal Oscillator
ECLK
External Clock
MAX
24
50
UNITS
MHz
MHz
NOTES
T_ECLK
External Clock Period
20
T_ECH, T_ECL External Clock High/Low
8
Time
I_OH(AC)
Switching Current High
-44
I_OL(AC)
Switching Current Low
95
I_CL
Low Clamp Current
-25+(Vin+1)/0.015
Slew_R
Output Rise Slew Rate
1
4
Slew_F
Output Fall Slew Rate
1
4
T_CYC
CLK Cycle Time
30
∞
T_HI
CLK High Time
11
T_LO
CLK Low Time
11
CLK Slew Rate
1
4
T_VAL
CLK to Signal Valid Delay
2
11
T_ON
Float to Active Delay
2
T_OFF
Active to Float Delay
28
T_SETUP
Input Setup Time to CLK -
7
bused signals
T_HOLD
Input Hold Time from CLK
0
ns
ns
mA
mA
mA
V/ns
V/ns
ns
ns
ns
V/ns
ns
ns
ns
ns
ns
T_ECLK = 1/ECLK
See PCI Specifica-
tion Rev. 2.3
See PCI Specifica-
tion Rev. 2.3
-5 < Vin ≤ -1
0.4V to 2.4V load
2.4V to 0.4V load
PCI Bus Clock, CLK
T_PRST
RST# Active Time After
1
Power Stable
T_CRST#
RST# Active Time After
100
CLK Stable
RST# Slew Rate
50
ms
us
mV/ns
54