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RM48L940 датащи(PDF) 54 Page - Texas Instruments

номер детали RM48L940
подробное описание детали  RM48Lx40 16- and 32-Bit RISC Flash Microcontroller
Download  174 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

RM48L940 датащи(HTML) 54 Page - Texas Instruments

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3.3 V
V
CCIOPORH
1.2 V
V
CCPORH
V
CCIOPORL
V
(1.2 V)
V
/ V
(3.3 V)
CC
CCIO
CCP
nPORRST
8
6
6
7
7
9
3
V
CCPORL
V
IL(PORRST)
V
/ V
CCIO
CCP
V
CC
V
CCPORL
V
IL(PORRST)
V
IL
V
IL
V
IL
V
CCIOPORH
V
CCPORH
V
CCIOPORL
NOTE: There is no timing dependency between the ramp of the VCCIO and the VCC supply voltage; this is just an exemplary drawing.
RM48L940, RM48L740, RM48L540
SPNS175C – APRIL 2012 – REVISED JUNE 2015
www.ti.com
6.3.2
Power-Down Sequence
The different supplies to the device can be powered down in any order.
6.3.3
Power-On Reset: nPORRST
This is the power-on reset. This reset must be asserted by an external circuitry whenever the I/O or core
supplies are outside the specified recommended range. This signal has a glitch filter on it. It also has an
internal pulldown.
6.3.3.1
nPORRST Electrical and Timing Requirements
Table 6-4. Electrical Requirements for nPORRST
NO.
PARAMETER
MIN
MAX
UNIT
VCCPORL
VCC low supply level when nPORRST must be active during power up
0.5
V
VCC high supply level when nPORRST must remain active during power
VCCPORH
1.14
V
up and become active during power down
VCCIO / VCCP low supply level when nPORRST must be active during
VCCIOPORL
1.1
V
power up
VCCIO / VCCP high supply level when nPORRST must remain active
VCCIOPORH
3.0
V
during power up and become active during power down
VIL(PORRST)
Low-level input voltage of nPORRST VCCIO > 2.5V
0.2 * VCCIO
V
Low-level input voltage of nPORRST VCCIO < 2.5V
0.5
V
Setup time, nPORRST active before VCCIO and VCCP > VCCIOPORL during
3
tsu(PORRST)
0
ms
power up
6
th(PORRST)
Hold time, nPORRST active after VCC > VCCPORH
1
ms
7
tsu(PORRST)
Setup time, nPORRST active before VCC < VCCPORH during power down
2
µs
8
th(PORRST)
Hold time, nPORRST active after VCCIO and VCCP > VCCIOPORH
1
ms
9
th(PORRST)
Hold time, nPORRST active after VCC < VCCPORL
0
ms
Filter time nPORRST pin;
tf(nPORRST)
500
2000
ns
pulses less than MIN will be filtered out, pulses greater than MAX will
generate a reset.
Figure 6-1. nPORRST Timing Diagram
54
System Information and Electrical Specifications
Copyright © 2012–2015, Texas Instruments Incorporated
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