參數(shù)資料
型號(hào): CPS1087
英文描述: Analog IC
中文描述: 模擬IC
文件頁(yè)數(shù): 57/64頁(yè)
文件大?。?/td> 870K
代理商: CPS1087
Agere Systems Inc.
Data Sheet
January 2002
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
57
11 Timing Characteristics and Requirements
(continued)
11.2 Power-On Reset
The CSP1027 has a power-on reset circuit that automatically clears the device upon power-on. If the supply voltage
falls below V
DD
MIN
*
, the device must be reset. Figure 40 on page 57 shows two separate events: an initial power-
on and a power-on following a drop in the power supply.
* See Table 11 on page 47.
Figure 40. Power-On Reset Timing Diagram
Note: The device needs to be clocked for at least six CLK cycles during reset after power-on. Otherwise, high and unstable current may flow.
Table 26. Timing Requirement for Power-On Reset
Abbreviated
Reference
t9
V
DD
Ramp
Parameter
Min
Max
Unit
1
ms
Table 27. Timing Characteristic for Power-On Reset
Abbreviated
Reference
t10
PORB Pulse Width (low to change)
Parameter
Min
Max
Unit
1.5
7
ms
V
DD
RAMP
PORB
V
OH
V
OL
0 V
V
DD
MIN
t10
t10
V
DD
MIN
0.5 V
t9
t9
5-7619 (F)
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