th Oct. 2009 17 www.semtech.com SX1507/SX1508/SX1509 W" />
參數(shù)資料
型號: SX1508IULTRT
廠商: Semtech
文件頁數(shù): 9/41頁
文件大小: 0K
描述: IC GPIO EXPANDER I2C 8CH 20QFN
特色產(chǎn)品: SX1508/SX1509 GPIO Expanders
標準包裝: 1
接口: I²C
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時鐘: 400kHz
電源電壓: 1.2 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-UFQFN 裸露焊盤
供應商設備封裝: 20-QFN-UT(3x3)
包裝: 標準包裝
包括: LED 驅(qū)動器 / 小鍵盤引擎
其它名稱: SX1508IULDKR
ADVANCED COMMUNICATIONS & SENSING
Rev 1 – 30
th Oct. 2009
17
www.semtech.com
SX1507/SX1508/SX1509
World’s Lowest Voltage Level Shifting GPIO
with LED Driver and Keypad Engine
VCC1
IO0
1.2-3.6V
SX1508/9
VCC2
IO4
1.2-3.6V
1.2-5.5V
1.2-3.6V
tLevelShiftMin
Figure 12 – Level Shifting Example
The minimum pulse width tLevelShiftMin which can be level shifted properly depends on VCCx and VDDM:
tLevelShiftMin = Input Delay + Core Delay + Output Delay
Input/Core/Output delays vs VCCx/VDDM are given in figures below.
Figure 13 – Level Shifter Max Frequency Calculation Data
SX1509 Digital Core Delay vs. Supply Voltage
14
16
18
20
22
24
26
28
1
1.5
2
2.5
3
3.5
VDDM (V)
T
d
e
la
y
(n
s
)
Typical
Worst Case
IO Input Delay vs. Supply Voltage
0.000
1.000
2.000
3.000
4.000
5.000
6.000
7.000
8.000
9.000
10.000
1.000
1.500
2.000
2.500
3.000
3.500
VCCx (V)
T
d
e
la
y
(n
s
)
Typical
Worst Case
SX1508 Digital Core Delay vs. Supply Voltage
14
16
18
20
22
24
26
28
1
1.5
2
2.5
3
3.5
VDDM (V)
T
d
e
la
y
(n
s
)
Typical
Worst Case
IO Output Delay vs. Supply Voltage ( LowDriveEn=0, 20pF Load)
0.000
20.000
40.000
60.000
80.000
100.000
120.000
140.000
1.000
1.500
2.000
2.500
3.000
3.500
VCCx (V)
T
d
e
la
y
(n
s
)
Typical
Worst Case
IO Output Delay vs. Supply Voltage (LowDriveEn=1, 20pF Load)
0.000
20.000
40.000
60.000
80.000
100.000
120.000
140.000
1.000
1.500
2.000
2.500
3.000
3.500
VCCx (V)
T
d
e
la
y
(n
s
)
Typical
Worst Case
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