參數(shù)資料
型號: NS7520B-1-I55
廠商: Digi International
文件頁數(shù): 27/68頁
文件大?。?/td> 0K
描述: IC ARM MICROPROCESSOR 177BGA
標(biāo)準(zhǔn)包裝: 160
系列: NET+ARM®
應(yīng)用: 網(wǎng)絡(luò)處理器
核心處理器: ARM7
程序存儲器類型: 外部程序存儲器
RAM 容量: 外部
接口: EBI/EMI,以太網(wǎng),DMA,SPI,UART
輸入/輸出數(shù): 16
電源電壓: 1.4 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 177-LFBGA
包裝: 托盤
供應(yīng)商設(shè)備封裝: 177-BGA(13x13)
Reset_timing
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29
Reset_timing
From a cold start, RESET_ must be asserted until all power supplies are above their specified
thresholds. An additional 8 microseconds is required for oscillator settling time (allow 40ms for
crystal startup).
Due to an internal three flip-flop delay on the external RESET_ signal, after the oscillator is
settled, RESET_ must be asserted for three periods of the XTALA1 clock in these situations:
Before release of reset after application of power
While valid power is maintained to initiate hot reset (reset while power is at or above
specified thresholds)
Before loss of valid power during power outage/power down
The PORTC4 output indicates the reset state of the chip. PORTC4 persists beyond the negation of
RESET_ for approximately 512 system clock cycles if the PLL is disabled. When the PLL is enabled,
PORTC4 persists beyond the negation of RESET_ to allow for PLL lock for 100 microseconds times
the ratio of the VCO to XTALA.
Reset timing parameters
Num
Description
Min
Typ
Max
Units
1
Power valid before reset negated
40
ms
Note: RESET_ should remain low
for at least 40ms after power
reaches 3.0V.
2
Reset asserted after power valid
3
TXTALA1
3
Reset asserted while power valid
3
TXTALA1
4
Reset asserted before power invalid
3
TXTALA1
4
3
2
1
VDD, VCC
XTALA1
RESET_
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