XR17D158IV-F Datasheet, PDF (60/73 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART

XR17D158
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
xr
REV. 1.2.2
AC ELECTRICAL CHARACTERISTICS FOR 3.3V PCI BUS INTERFACE
(VIO = 3.0-3.6V, VCC = 4.5 - 5.5V), TA=0^o to 70^oC (-40^o to +85^oC for industrial grade package).
SYMBOL
PARAMETER
MIN
MAX
UNITS
NOTES
XTAL1
UART Crystal Oscillator
24
MHz
On-chip osc.
ECLK
External Clock
50
MHz
T_ECLK
External Clock Time Period
20
T_ECH, T_ECL External Clock High/Low
8
Time
ns
T_ECLK = 1/ECLK
ns
I_OH(AC)
Switching Current High
-12VIO
mA See PCI Specification
Rev. 2.3
I_OL(AC)
Switching Current Low
16VIO
mA See PCI Specification
Rev. 2.3
I_CH
I_CL
Slew_R
Slew_F
T_CYC
High Clamp Current
Low Clamp Current
Output Rise Slew Rate
Output Fall Slew Rate
CLK Cycle Time
25+(Vin-VIO-1)/0.015
-25+(Vin+1)/0.015
1
4
1
4
30
∞
mA
VIO+4 > Vin ≥ VIO+1
mA
-3 < Vin ≤ -1
V/ns 0.2VIO - 0.6VIO load
V/ns 0.6VIO - 0.2VIO load
ns
PCI Bus Clock, CLK
T_HI
CLK High Time
T_LO
CLK Low Time
CLK Slew Rate
11
ns
11
ns
1
4
V/ns
T_VAL
CLK to Signal Valid Delay
2
T_ON
Float to Active Delay
2
T_OFF
Active to Float Delay
T_SETUP
Input Setup Time to CLK -
7
bused signals
11
ns
ns
28
ns
ns
T_HOLD
Input Hold Time from CLK
0
ns
T_PRST
RST# Active Time After
1
ms
Power Stable
T_CRST#
RST# Active Time After CLK
100
us
Stable
RST# Slew Rate
50
mV/ns
60