參數(shù)資料
型號: DSP1629
英文描述: TVS 400W 64V UNIDIRECT SMA
中文描述: DSP1629數(shù)字信號處理器
文件頁數(shù): 101/126頁
文件大?。?/td> 1993K
代理商: DSP1629
Data Sheet
March 2000
DSP1629 Digital Signal Processor
Lucent Technologies Inc.
101
11 Timing Characteristics for 2.7 V Operation
(continued)
11.2 Reset Circuit
The DSP1629 has two external reset pins: RSTB and TRST. At initial powerup, or if the supply voltage falls below
V
DD
MIN* and a device reset is required, both TRST and RSTB must be asserted to initialize the device. Figure 37
shows two separate events:
I
Chip reset at initial powerup.
I
Chip reset following a drop in power supply.
Note:
The TRST pin must be asserted even if the JTAG controller is not used by the application.
*
See Table 60, Recommended Operating Conditions.
*
When both INT0 and RSTB are asserted, all output and bidirectional pins (except TDO, which 3-states by JTAG control) are put in a 3-state
condition. With RSTB asserted and INT0 not asserted, EROM, ERAMHI, ERAMLO, IO, and RWN outputs remain high, and CKO remains a
free-running clock.
See Table 62 for input clock electrical requirements.
Figure 37. Powerup Reset and Chip Reset Timing Diagram
Note:
The device needs to be clocked for at least six CKI cycles during reset after powerup. Otherwise, high cur-
rents may flow.
Table 108. Timing Requirements for Powerup Reset and Chip Reset
Abbreviated Reference
t8
t9
t146
Parameter
Min
6T
2T
Max
10
54
Unit
ns
ms
ns
μs
ns
RSTB and TRST Reset Pulse (low to high)
V
DD
Ramp
V
DD
MIN to RSTB Low
CMOS
Small-signal
t153
RSTB (low to high)
Table 109. Timing Characteristics for Powerup Reset and Chip Reset
Abbreviated Reference
t10
t11
Parameter
Min
Max
100
100
Unit
ns
ns
RSTB Disable Time (low to 3-state)
RSTB Enable Time (high to valid)
V
DD
RAMP
RSTB,
TRST
OUTPUT
PINS*
CKI
t11
V
OH
V
OL
V
IH
V
IL
t9
t146
t10
0.4 V
V
DD
MIN
t11
V
DD
MIN
0.4 V
t10
t9
t146
t153
t8
t153
t8
5-4010 (F).a
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