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參數(shù)資料
| 型號： | TPS3600x20PWR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| 中文描述： | 電池備份監(jiān)事的低功耗處理器 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 510K |
| 代理商： | TPS3600X20PWR |
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SLVS336B DECEMBER 2000 REVISED JANUARY 2007
7
detailed description (continued)
25
μ
s
200 ms
100
μ
A
t
IBAT
Figure 1. BATTOK Timing
chip-enable signal gating
The internal gating of chip-enable signals (CE) prevents erroneous data from corrupting CMOS RAM during
an under-voltage condition. The TPS3600 use a series transmission gate from CEIN to CEOUT. During normal
operation (reset not asserted), the CE transmission gate is enabled and passes all CE transitions. When reset
is asserted, this path becomes disabled, preventing erroneous data from corrupting the CMOS RAM. The short
CE propagation delay from CEIN to CEOUT enables the TPS3600 devices to be used with most processors.
The CE transmission gate is disabled and CEIN is high impedance (disable mode) while reset is asserted.
During a power-down sequence when V
DD
crosses the reset threshold, the CE transmission gate will be
disabled and CEIN immediately becomes high impedance if the voltage at CEIN is high. If CEIN is low during
reset is asserted, the CE transmission gate will be disabled same time when CEIN goes high, or 15
μ
s after reset
asserts, whichever occurs first. This will allow the current write cycle to complete during power down. When the
CE transmission gate is enabled, the impedance of CEIN appears as a resistor in series with the load at CEOUT.
The overall device propagation delay through the CE transmission gate depends on V
OUT
, the source
impedance of the device connected to CEIN and the load at CEOUT. To achieve minimum propagation delay,
the capacitive load at CEOUT should be minimized, and a low-output-impedance driver be used.
During disable mode, the transmission gate is off and an active pullup connects CEOUT to V
OUT
. This pullup
turns off when the transmission gate is enabled.
15
μ
s
CEIN
CEOUT
RESET
t
t
t
Figure 2. Chip-Enable Timing
www.ti.com
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TPS3600X25PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
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| TPS3600X33PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600X33PWR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600X50PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
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