SX1509BIULTRT Semtech, SX1509BIULTRT Datasheet - Page 17

• Manufacturer Part Number: SX1509BIULTRT
• Description: 16-chan GPIO W/ LED Driver & Keypad Engine (I2C)
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
The minimum pulse width tLevelShiftMin which can be level shifted properly depends on VCCx and VDDM:
Input/Core/Output delays vs VCCx/VDDM are given in figures below.
Rev 1 – 30
th
140.000
120.000
100.000
28
26
24
22
20
18
16
14
80.000
60.000
40.000
20.000
0.000
Oct. 2009
1
1.000
IO Output Delay vs. Supply Voltage ( LowDriveEn=0, 20pF Load)
1.5
SX1508 Digital Core Delay vs. Supply Voltage
1.500
2
Figure 13 – Level Shifter Max Frequency Calculation Data
tLevelShiftMin = Input Delay + Core Delay + Output Delay
2.000
Typical
Typical
VDDM (V)
VCCx (V)
2.5
Worst Case
2.500
Worst Case
10.000
9.000
8.000
7.000
6.000
5.000
4.000
3.000
2.000
1.000
0.000
1.000
Figure 12 – Level Shifting Example
3.000
SX1508/9
3
1.500
VCC1
VCC2
3.500
IO4
IO Input Delay vs. Supply Voltage
3.5
IO0
2.000
1.2-3.6V
1.2-3.6V
Typical
17
VCCx (V)
2.500
Worst Case
tLevelShiftMin
140.000
120.000
100.000
28
26
24
22
20
18
16
14
80.000
60.000
40.000
20.000
0.000
1
1.000
World’s Lowest Voltage Level Shifting GPIO
3.000
1.2-5.5V
1.2-3.6V
IO Output Delay vs. Supply Voltage (LowDriveEn=1, 20pF Load)
SX1509 Digital Core Delay vs. Supply Voltage
1.5
1.500
3.500
with LED Driver and Keypad Engine
SX1507/SX1508/SX1509
2
2.000
Typical
Typical
VDDM (V)
VCCx (V)
2.5
2.500
Worst Case
Worst Case
3.000
3
www.semtech.com
3.500
3.5