Data Sheet
June 2001
DSP16410B Digital Signal Processor
276
Agere Systems—Proprietary
Use pursuant to Company instructions
Agere Systems Inc.
11 Timing Characteristics and Requirements
Timing characteristics refer to the behavior of the device under specified conditions. Timing requirements refer to
conditions imposed on the user for proper operation of the device. All timing data is valid for the following condi-
tions:
T
J
= –40
°
C to +120
°
C (See
Section 9.3 on page 265
.)
V
DD
2 = 3.3 V
±
0.3 V, V
SS
= 0 V (See
Section 9.3 on page 265
.)
Capacitance load on outputs (C
L
) = 30 pF
Output characteristics can be derated as a function of load capacitance (C
L
).
All outputs: 0.025 ns/pF
≤
dt/dC
L
≤
0.07 ns/pF for 10
≤
C
L
≤
100 pF.
For example, if the actual load capacitance on an output pin is 20 pF instead of 30 pF, the maximum derating for a
rising edge is (20 – 30) pF x 0.07 ns/pF = 0.7 ns
less
than the specified rise time or delay that includes a rise time.
The minimum derating for the same 20 pF load would be (20 – 30) pF x 0.025 ns/pF = 0.25 ns.
Test conditions for inputs:
I
Rise and fall times of 4 ns or less.
I
Timing reference levels for CKI, RSTN, TRST0N, TRST1N, TCK0, and TCK1 are V
IH
and V
IL.
I
Timing reference level for all other inputs is V
M
(see
Table 182
).
Test conditions for outputs (unless noted otherwise):
I
C
LOAD
= 30 pF.
I
Timing reference levels for ECKO are V
OH
and V
OL.
I
Timing reference level for all other outputs is V
M
(see
Table 182
)
.
I
3-state delays measured to the high-impedance state of the output driver.
Unless otherwise noted, ECKO in the timing diagrams is the free-running CLK (
ECON1
[1:0] (
Table 60 on
page 110
) = 1).
Figure 68. Reference Voltage Level for Timing Characteristics and Requirements for Inputs and Outputs
Table 182. Reference Voltage Level for Timing Characteristics and Requirements for Inputs and Outputs
Abbreviated Reference
V
M
Parameter
Value
1.5
Unit
V
Reference Voltage Level for Timing Characteristics and
Requirements for Inputs and Outputs
V
M
–
5-8215 (F)