XR17V254 Datasheet, PDF (59/70 Pages) Exar Corporation – 66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT

REV. 1.0.0
XR17V254
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
AC ELECTRICAL CHARACTERISTICS FOR 3.3V SIGNALING
TA=-40^O TO+85^OC (INDUSTRIAL GRADE) VCC = 3.0 - 3.6V
SYMBOL
XTAL1
PARAMETER
UART Crystal Oscillator
MIN
MAX
24
ECLK
External Clock
33
I_{OH(AC, min)} Switching Current High, Min
I_{OH(AC, max)} Switching Current High, Max
I_{OL(AC, min)} Switching Current Low, Min
I_{OL(AC, max)} Switching Current Low, Max
I_CH
High Clamp Current
I_CL
Low Clamp Current
Slew_R
Output Rise Slew Rate
Slew_F
Output Fall Slew Rate
T_cyc
CLK Cycle Time
-12VCC
16VCC
25+(Vin-VCC-1)/0.015
-25+(Vin+1)/0.015
1
1
15
-32VCC
38VCC
4
4
T_high
CLK High Time
6
T_low
CLK Low Time
6
CLK Slew Rate
1.5
4
T_val
CLK to Signal Valid Delay
2
6
T_on
Float to Active Delay
2
T_off
Active to Float Delay
14
T_su
Input Setup Time to CLK -
3
bused signals
T_su (ptp) Input Setup Time to CLK -
5
point to point signals
T_h
Input Hold Time from CLK
0
T_rst
RST# Active Time After
1
Power Stable
T_rst-clk#
RST# Active Time After CLK
100
Stable
T_rst-off
Reset Active to output float
40
delay
T_rhfa
RST# HIGH to first Configu-
2²⁵
ration access
T_rhff
RST# HIGH to first FRAME#
5
assertion
RST# Slew Rate
50
UNITS
MHz
MHz
mA
mA
mA
mA
mA
mA
V/ns
V/ns
ns
ns
ns
V/ns
ns
ns
ns
ns
NOTES
On-chip osc.
V_out = 0.3VCC
V_out = 0.7VCC
V_out = 0.6VCC
V_out = 0.18VCC
VCC+4 > Vin ≥ VCC+1
-3 < Vin ≤ -1
0.3VCC to 0.6VCC
0.6VCC to 0.3VCC
PCI bus Clock, CLK
up to 66.67MHz
Bused and point to
point signals
ns
ns
ms
us
ns
clocks
clocks
mV/ns
59