參數(shù)資料
型號(hào)： CPS1027-J
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁數(shù)： 55/64頁
文件大小： 870K
代理商： CPS1027-J
Agere Systems Inc.
Data Sheet
January 2002
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
55
11 Timing Characteristics and Requirements
The following timing characteristics and requirements are preliminary information and are subject to change. Tim-
ing characteristics refer to the behavior of the device under specified conditions. Timing requirements refer to con-
ditions imposed on the user for proper operation of the device. All timing data is valid for the following conditions:
T
A
= –40 °C to +85 °C or 0 °C to 70 °C (See Section 8.2 on page 47.)
V
DD
= 5 V ± 0.5 V, 3.3 V ± 0.3 V, or 3.0 V ± 0.3 V, V
SS
= 0 V (See Section 8.2 on page 47.)
Capacitance load on outputs (C
L
) = 50 pF
Output characteristics can be derated as a function of load capacitance (C
L
).
All outputs: dt/dC
L
≤
0.06 ns/pF for 0
≤
C
L
≤
100 pF at V
IH
for rising edge
dt/dC
L
≤
0.05 ns/pF for 0
≤
C
L
≤
100 pF at V
IL
for falling edge
For example, if the actual load capacitance is 30 pF instead of 50 pF, the derating for a rising edge is
(30 pF – 50 pF) x 0.06 ns/pF = 1.2 ns
less
than the specified rise time or delay which includes a rise time.
Test conditions for inputs:
I
Rise and fall times of 4 ns or less
I
Timing reference levels for delays = V
IH
, V
IL
Test conditions for outputs:
I
C
LOAD
= 50 pF
I
Timing reference levels for delays = V
IH
, V
IL
I
3-state delays measured to the high-impedance state of the output driver
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