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PCF8575CPWR 数据表(PDF) 20 Page - Texas Instruments

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部件名 PCF8575CPWR
功能描述  SMBus Low-Power I/O Expander
PDF  38 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

PCF8575CPWR 数据表(HTML) 20 Page - Texas Instruments

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VCC
Ramp-Up
Time to Re-Ramp
Time
Ramp-Down
VIN drops below POR levels
VCC_RT
VCC_FT
VCC_TRR_VPOR50
VCC
Ramp-Up
Re-Ramp-Up
Time to Re-Ramp
Time
Ramp-Down
VCC_RT
VCC_RT
VCC_FT
VCC_TRR_GND
PCF8575C
SCPS123F – MARCH 2005 – REVISED JANUARY 2015
www.ti.com
10 Power Supply Recommendations
10.1 Power-On Reset Requirements
In the event of a glitch or data corruption, PCF8575C can be reset to its default conditions by using the power-on
reset feature. Power-on reset requires that the device go through a power cycle to be completely reset. This
reset also happens when the device is powered on for the first time in an application.
The two types of power-on reset are shown in Figure 20 and Figure 21.
Figure 20. VCC is Lowered Below 0.2 V or 0 V and Then Ramped Up to VCC
Figure 21. VCC is Lowered Below the POR Threshold, Then Ramped Back Up to VCC
Table 1 specifies the performance of the power-on reset feature for PCF8575C for both types of power-on reset.
Table 1. RECOMMENDED SUPPLY SEQUENCING AND RAMP RATES(1)
PARAMETER
MIN
TYP
MAX
UNIT
VCC_FT
Fall rate
See Figure 20
1
100
ms
VCC_RT
Rise rate
See Figure 20
0.01
100
ms
VCC_TRR_GND
Time to re-ramp (when VCC drops to GND)
See Figure 20
0.001
ms
VCC_TRR_POR50
Time to re-ramp (when VCC drops to VPOR_MIN – 50 mV)
See Figure 21
0.001
ms
Level that VCCP can glitch down to, but not cause a functional
VCC_GH
See Figure 22
1.2
V
disruption when VCCX_GW = 1 μs
Glitch width that will not cause a functional disruption when
VCC_GW
See Figure 22
μs
VCCX_GH = 0.5 × VCCx
VPORF
Voltage trip point of POR on falling VCC
0.767
1.144
V
VPORR
Voltage trip point of POR on fising VCC
1.033
1.428
V
(1)
TA = –40°C to 85°C (unless otherwise noted)
20
Submit Documentation Feedback
Copyright © 2005–2015, Texas Instruments Incorporated
Product Folder Links: PCF8575C



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