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Lattice Semiconductor
105
Data Sheet
November 2006
ORCA Series 3C and 3T FPGAs
Timing Characteristics (continued)
Table 43. Ripple Mode PFU Timing Characteristics
OR3Cxx Commercial: VDD = 5.0 V ± 5%, 0 °C < TA < 70 °C; Industrial: VDD = 5.0 V ± 10%, –40 °C < TA < +85 °C.
OR3Txxx Commercial: VDD = 3.0 V to 3.6 V, 0 °C < TA < 70 °C; Industrial: VDD = 3.0 V to 3.6 V, –40 °C < TA < +85 °C.
Parameter
(TJ = +85 °C, VDD = min)
Symbol
Speed
Unit
-4
-5
-6
-7
Min Max Min Max Min Max Min Max
Full Ripple Setup Times (byte wide):
Operands to Clock (Kz[1:0] to CLK)
Bitwise Operands to Clock (Kz[1:0] to CLK at F[z])
Fast Carry-in to Clock (FCIN to CLK)
Carry-in to Clock (CIN to CLK)
Add/Subtract to Clock (ASWE to CLK)
Operands to Clock (Kz[1:0] to CLK at REGCOUT)
Fast Carry-in to Clock (FCIN to CLK at REGCOUT)
Carry-in to Clock (CIN to CLK at REGCOUT)
Add/Subtract to Clock (ASWE to CLK at REGCOUT)
RIP_SET
FRIP_SET
FCIN_SET
CIN_SET
AS_SET
RIPRC_SET
FCINRC_SET
CINRC_SET
ASRC_SET
3.50
1.99
2.55
3.80
8.82
2.09
2.29
3.09
8.14
—
2.50
1.47
1.87
2.79
6.18
1.61
1.76
2.36
5.73
—
1.96
1.08
1.34
1.97
4.68
1.19
1.28
1.73
4.54
—
1.48
0.85
1.04
1.56
3.50
0.93
1.02
1.35
3.39
—
ns
Full Ripple Hold Times (TJ = all, VDD = all):
Fast Carry-in from Clock (FCIN from CLK at REG-
COUT)
All Others
FCINRC_HLD
GENERIC_HLD
0.00
—
0.00
—
0.00
—
0.00
—
ns
Half Ripple Setup Times (nibble wide):
Operands to Clock (Kz[1:0] to CLK)
Bitwise Operands to Clock (Kz[1:0] to CLK at F[z])
Fast Carry-in to Clock (FCIN to CLK)
Carry-in to Clock (CIN to CLK)
Add/Subtract to Clock (ASWE to CLK)
Operands to Clock (Kz[1:0] to CLK at REGCOUT)
Fast Carry-in to Clock (FCIN to CLK at REGCOUT)
Carry-in to Clock (CIN to CLK at REGCOUT)
Add/Subtract to Clock (ASWE to CLK at REGCOUT)
HRIP_SET
HFRIP_SET
HFCIN_SET
HCIN_SET
HAS_SET
HRIPRC_SET
HFCINRC_SET
HCINRC_SET
HASRC_SET
3.91
1.99
2.55
3.80
8.82
3.03
2.29
3.09
8.14
—
2.81
1.47
1.87
2.79
6.18
2.31
1.76
2.36
5.73
—
2.21
1.08
1.34
1.97
4.68
1.68
1.28
1.73
4.54
—
1.66
0.85
1.04
1.56
3.50
1.32
1.02
1.35
3.39
—
ns
Half Ripple Hold Times (TJ = all, VDD = all):
Fast Carry-in from Clock (HFCIN from CLK at REG-
COUT)
All Others
HFCINRC_HLD
GENERIC_HLD
0.00
—
0.00
—
0.00
—
0.00
—
ns
Note: The table shows worst-case delay for the ripple chain. ispLEVER reports the delay for individual paths within the ripple chain that will be
less than or equal to those listed above.
Select
devices
have
been
discontinued.
See
Ordering
Information
section
for
product
status.