![](http://datasheet.mmic.net.cn/370000/OR2T04A-2PS84_datasheet_16726875/OR2T04A-2PS84_137.png)
Data Sheet
June 1999
ORCA Series 2 FPGAs
Lucent Technologies Inc.
137
Timing Characteristics
(continued)
Table 34B. OR2TxxB Ripple Mode PFU Timing Characteristics
OR2TxxB Commercial: V
DD
= 3.0 V to 3.6 V, 0 °C
≤
T
A
≤
70 °C; OR2TxxB Industrial: V
DD
= 3.0 V to 3.6 V, –40 °C
≤
T
A
≤
+85
°C.
Parameter
Symbol
Speed
Unit
-7
-8
Min
Max
Min
Max
Ripple Setup Times
(T
J
= 85 °C, V
DD
= min):
Operands to Clock (A[3:0], B[3:0] to CK)
Bitwise Operands to Clock
(A[i], B[i] to CK at F[i])
Carry-in from Fast Carry to Clock
(CIN to CK)
Carry-in from General Routing to Clock
(B4 to CK)
Add/Subtract to Clock (A4 to CK)
Ripple Hold Times (T
J
= all, V
DD
= all): All
Ripple Delays (T
J
= 85 °C, V
DD
= min):
Operands to Carry-out (A[3:0], B[3:0]
to COUT)
Operands to Carry-out (A[3:0], B[3:0]
to O4)
Operands to PFU Out (A[3:0], B[3:0]
to F[3:0])
Bitwise Operands to PFU Out (A[i], B[i]
to F[i])
Carry-in from Fast Carry to Carry-out
(CIN to COUT)
Carry-in from Fast Carry to Carry-out
(CIN to O4)
Carry-in from Fast Carry to PFU Out
(CIN to F[3:0])
Carry-in from General Routing to Carry-
out (B4 to COUT)
Carry-in from General Routing to Carry-
out (B4 to O4)
Carry-in from General Routing to PFU Out
(B4 to F[3:0])
Add/Subtract to Carry-out (A4 to COUT)
Add/Subtract to Carry-out (A4 to O4)
Add/Subtract to PFU Out (A4 to F[3:0])
RIP_SET
FRIP_SET
CIN_SET
B4_SET
AS_SET
TH
2.4
1.1
1.6
1.0
2.9
—
—
—
—
—
1.9
0.9
1.3
0.8
2.3
—
—
—
—
—
ns
ns
ns
ns
ns
ns
RIP_CODEL
RIP_O4DEL
RIP_DEL
FRIP_DEL
CIN_CODEL
CIN_O4DEL
CIN_DEL
B4_CODEL
B4_O4DEL
B4_DEL
AS_CODEL
AS_O4DEL
AS_DEL
2.2
3.0
3.1
1.4
0.7
1.4
1.9
0.7
1.4
1.9
2.7
3.4
3.6
—
—
—
—
—
—
—
—
—
—
—
—
—
1.8
2.4
2.5
1.1
0.6
1.2
1.5
0.6
1.2
1.5
2.2
2.8
2.9
—
—
—
—
—
—
—
—
—
—
—
—
—
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes: The new 4 x 1 multiplier and 4-bit comparator submodes use the appropriate ripple mode timing shown above.