
SEC ASIC
6-17
STDL80
Carry-Select Adder
Function Table
Type
Adder
Overflow
Truth Table
Pin Description
Pin Capacitance
Performance Table
(T = 25
°
C, Slope = 1.0ns, Cap. = 0.4pF, f = 10MHz)
Function
AIN + BIN + CIN
(~SOUT [bits–1]) (AIN [bits–1] BIN [bits–1]) + (SOUT [bits–1]) (~AIN [bits–1])
(~BIN [bits–1])
Inputs
BIN
0
0
1
1
0
0
1
1
Outputs
AIN
0
1
0
1
0
1
0
1
CIN
0
0
0
0
1
1
1
1
SOUT
0
1
1
0
1
0
0
1
COUT
0
0
0
1
0
1
1
1
Pin Name
I/O
I
Description
AIN [bits–1:0]
BIN [bits–1:0]
CIN
SOUT [bits–1:0]
COUT
OVF
Input data word
Input data word
Carry-in
Sum output (AIN + BIN + CIN)
Carry-out
Overflow output occurs during a signed addition (optional
when the parameter overflow = 1).
O
Pin Name
Value (pF)
0.083
0.077
0.065
AIN
BIN
CIN
Parameters overflow = 0, drv = 1
Bit
Area (
μ
m x
μ
m)
Width
240.5
451.7
662.9
874.1
Delay (ns)
Current (mA)
Height
146.8
149.5
151.3
151.3
T
PLH
2.508
3.028
3.338
3.468
T
PHL
2.134
2.654
2.982
3.104
8
16
24
32
0.212
0.447
0.689
0.929