ispPAC-CLK55xx Lattice Semiconductor, ispPAC-CLK55xx Datasheet - Page 7

• Manufacturer Part Number: ispPAC-CLK55xx
• Description: In-System Programmable Clock Generator with Universal Fan-Out Buffer
• Manufacturer: Lattice Semiconductor

Lattice Semiconductor
Switching Characteristics – Timing Adders for I/O Modes
Output Rise and Fall Times – Typical Values
t
LVTTL_in
LVCMOS18_in
LVCMOS25_in
LVCMOS33_in
SSTL2_in
SSTL3_in
HSTL_in
LVDS_in
LVPECL_in
t
LVTTL_out
LVCMOS18_out
LVCMOS25_out
LVCMOS33_out
SSTL2_out
SSTL3_out
HSTL_out
LVDS_out
LVPECL_out
t
Slew_1
Slew_2
Slew_3
Slew_4
1. Measured under standard output load conditions – see Figures 3-5.
2. All input adders referenced to LVTTL.
3. All output adders referenced to LVPECL.
LVTTL
LVCMOS 1.8V
LVCMOS 2.5V
LVCMOS 3.3V
SSTL2
SSTL3
HSTL
LVDS
LVPECL
1. See Figures 3-5 for test conditions.
2. Measured between 20% and 80% points.
3. Only the ‘fastest’ slew rate is available in LVDS and LVPECL modes.
IOI
IOO
IOS
Output Type
Adder Type
Input Adders
Output Slew Rate Adders
Output Adders
3
3
2
1, 3
Slew 1 (Fastest)
0.65
0.90
0.70
0.65
0.55
0.50
0.65
0.60
0.65
Base Parameter(s)
t
R
1
0.45
0.40
0.40
0.45
0.35
0.40
0.35
0.60
0.60
t
F
Using LVTTL Standard
Using LVCMOS 1.8V Standard
Using LVCMOS 2.5V Standard
Using LVCMOS 3.3V Standard
Using SSTL2 Standard
Using SSTL3 Standard
Using HSTL Standard
Using LVDS Standard
Using LVPECL Standard
Output Configured as LVTTL Buffer
Output Configured as LVCMOS 1.8V Buffer
Output Configured as LVCMOS 2.5V Buffer
Output Configured as LVCMOS 3.3V Buffer
Output Configured as SSTL2 Buffer
Output Configured as SSTL3 Buffer
Output Configured as HSTL Buffer
Output Configured as LVDS Buffer
Output Configured as LVPECL Buffer
Output Slew_1 (Fastest)
Output Slew_2
Output Slew_3
Output Slew_4 (Slowest)
0.85
1.05
0.90
0.85
0.85
0.80
0.85
—
—
t
R
Slew 2
0.60
0.50
0.55
0.60
0.45
0.50
0.45
—
—
t
F
Description
7
1.20
1.40
1.20
1.20
1.45
1.45
1.30
—
—
t
R
1, 2
Slew 3
ispClock5500 Family Data Sheet
0.90
0.80
0.85
0.90
0.65
0.75
0.65
—
—
t
F
Min.
Slew 4 (Slowest)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.75
2.00
1.80
1.75
2.30
2.30
1.90
t
—
—
R
1320
Typ.
330
660
0.4
0.4
0.4
1.8
1.8
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0
0
0
0
0
0
1.30
1.20
1.20
1.30
1.20
1.35
1.25
—
—
t
F
Max.
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ps
ps
ps
ps