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PCF8574ADGVR Datasheet(PDF) 19 Page - Texas Instruments

Part # PCF8574ADGVR
Description  PCF8574A Remote 8-Bit I/O Expander for I2C Bus
PDF  39 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

PCF8574ADGVR Datasheet(HTML) 19 Page - Texas Instruments

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VCC
Ramp-Up
Re-Ramp-Up
Time to Re-Ramp
Time
Ramp-Down
VCC_RT
VCC_RT
VCC_FT
VCC_TRR_GND
Figure 8-6. VCC is Lowered Below 0.2 V or 0 V and Then Ramped Up to VCC
VCC
Ramp-Up
Time to Re-Ramp
Time
Ramp-Down
VIN drops below POR levels
VCC_RT
VCC_FT
VCC_TRR_VPOR50
Figure 8-7. VCC is Lowered Below the POR Threshold, Then Ramped Back Up to VCC
Table 8-1 specifies the performance of the power-on reset feature for PCF8574A for both types of power-on
reset.
Table 8-1. Recommended Supply Sequencing and Ramp Rates (1)
PARAMETER
MIN
TYP
MAX
UNIT
VCC_FT
Fall rate
See Figure 8-6
1
100
ms
VCC_RT
Rise rate
See Figure 8-6
0.01
100
ms
VCC_TRR_GND
Time to re-ramp (when VCC drops to GND)
See Figure 8-6
0.001
ms
VCC_TRR_POR50
Time to re-ramp (when VCC drops to VPOR_MIN – 50 mV)
See Figure 8-7
0.001
ms
VCC_GH
Level that VCCP can glitch down to, but not cause a functional
disruption when VCCX_GW = 1 μs
See Figure 8-8
1.2
V
VCC_GW
Glitch width that will not cause a functional disruption when
VCCX_GH = 0.5 × VCCx
See Figure 8-8
μs
VPORF
Voltage trip point of POR on falling VCC
0.99
1.28
V
VPORR
Voltage trip point of POR on fising VCC
1.190
1.410
V
(1)
TA = –40°C to 85°C (unless otherwise noted)
Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width
(VCC_GW) and height (VCC_GH) are dependent on each other. The bypass capacitance, source impedance, and
device impedance are factors that affect power-on reset performance. Figure 8-8 and Table 8-1 provide more
information on how to measure these specifications.
V
CC
Time
V
CC_GH
V
CC_GW
Figure 8-8. Glitch Width and Glitch Height
www.ti.com
PCF8574A
SCPS069H – JULY 2001 – REVISED SEPTEMBER 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: PCF8574A



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