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| TMS470R1B768_07 Datasheet, PDF (31/50 Pages) Texas Instruments – 16/32-Bit RISC Flash Microcontroller | |||
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RST AND PORRST TIMINGS
TMS470R1B768
16/32-Bit RISC Flash Microcontroller
SPNS108A â AUGUST 2005 â REVISED AUGUST 2006
Timing Requirements for PORRST
(see Figure 8)
VCCPORL
VCCPORH
VCCIOPORL
VCCIOPORH
VIL
VIL(PORRST)
tsu(PORRST)r
tsu(VCCIO)r
th(PORRST)r
tsu(PORRST)f
th(PORRST)rio
th(PORRST)d
tsu(PORRST)fio
tsu(VCCIO)f
VCC low supply level when PORRST must be active during power up
VCC high supply level when PORRST must remain active during power up and become
active during power down
VCCIO low supply level when PORRST must be active during power up
VCCIO high supply level when PORRST must remain active during power up and become
active during power down
Low-level input voltage after VCCIO > VCCIOPORH
Low-level input voltage of PORRST before VCCIO > VCCIOPORL
Setup time, PORRST active before VCCIO > VCCIOPORL during power up
Setup time, VCCIO > VCCIOPORL before VCC > VCCPORL
Hold time, PORRST active after VCC > VCCPORH
Setup time, PORRST active before VCC ⤠VCCPORH during power down
Hold time, PORRST active after VCC VCCIOPORH
Hold time, PORRST active after VCC < VCCPORL
Setup time, PORRST active before VCC ⤠VCCIOPORH during power down
Setup time, VCC < VCCPORL before VCCIO < VCCIOPORL
MIN
MAX UNIT
0.6 V
1.5
V
1.1 V
2.75 V
0.2 VCCIO V
0.5 V
0
ms
0
ms
1
ms
8
µs
1
ms
0
ms
0
ns
0
ns
VCCP /VCCIO
V CCIOPORH
th(PORRST)rio
V CCIO
VCC
V CCPORH
VCCIOPORL
VCC
VCCP/VCCIO
PORRST
VCCPORL
tsu(VCCIO)r
tsu(PORRST)r
VIL(PORRST)
VIL
tsu(PORRST)f
th(PORRST)r
VIL
VCC
tsu(PORRST)fio
tsu(PORRST)f
th(PORRST)r
VIL
NOTE: VCCIO > 1.1 V before VCC > 0.6 V
Figure 8. PORRST Timing Diagram
V CCIOPORH
tsu(VCCIO)f
VCCPORH
VCCPORL
VCCIOPORL
th(PORRST)d
VIL VIL(PORRST)
Switching Characteristics over Recommended Operating Conditions for RST(1)
tv(RST)
PARAMETER
Valid time, RST active after PORRST inactive
Valid time, RST active (all others)
MIN
4112tc(OSC)
8tc(SYS)
MAX UNIT
ns
(1) Specified values do NOT include rise/fall times. For rise and fall timings, see the "Switching Characteristics for Output Timings versus
Load Capacitance" table.
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