參數(shù)資料
型號: AS1977-T
廠商: ams
文件頁數(shù): 7/18頁
文件大?。?/td> 0K
描述: IC COMPARATOR OPEN SOT23-5
標(biāo)準(zhǔn)包裝: 1
類型: 通用
元件數(shù): 1
輸出類型: CMOS,開路漏極,滿擺幅
電壓 - 電源,單路/雙路(±): 1.8 V ~ 5.5 V
電壓 - 輸入偏移(最小值): 5mV @ 5V
電流 - 輸入偏壓(最小值): 0.001µA @ 5V
電流 - 輸出(標(biāo)準(zhǔn)): 50mA
電流 - 靜態(tài)(最大值): 500nA
CMRR, PSRR(標(biāo)準(zhǔn)): 74dB CMRR,86.02dB PSRR
傳輸延遲(最大): 18ns
磁滯: 3mV
工作溫度: -40°C ~ 85°C
封裝/外殼: SC-74A,SOT-753
安裝類型: 表面貼裝
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: AS1977-TDKR
www.austriamicrosystems.com
Revision 1.01
14 - 17
AS1976/AS1977
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Logic-Level Translation
The AS1977 can be used as a 5V-to-3V logic translator. Figure 30 shows an application that converts 5V- to 3V-logic
levels, and provides the full 5V logic-swing without creating overvoltage on the 3V logic inputs.
Note:
When the comparator is powered by a 5V supply, RPULUP for the open-drain output should be connected to the
+3V supply voltage.
For 3V-to-5V logic-level translations, connect the +3V supply voltage to VCC and the +5V supply voltage to RPULUP.
Figure 30. AS1977 Logic-Level Translation Circuit
Layout Considerations
The AS1976/AS1977 requires proper layout and design techniques for optimum performance.
!
Power-supply bypass capacitors are not typically required, although 100nF bypass capacitors should be placed
close to the AS1976/AS1977 supply pins when supply impedance is high, leads are long, or for excessive noise on
the supply lines.
!
Minimize signal trace lengths to reduce stray capacitance.
!
A ground plane should be used.
!
Surface-mount components should be used whenever practical.
AS1977
RPullup
+5/+3V
Logic Out
+3/+5V
+5/+3V
Logic In
100k
Ω
100k
Ω
+3/+5V
Logic-Level Translator
5
VCC
3
IN+
1
OUT
2
VEE
4
REF
ams
AG
Technical
content
still
valid
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