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TMS470R1VF478 Datasheet, PDF (36/69 Pages) Texas Instruments – 16/32-BIT RISC FLASH MICROCONTROLLER
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TMS470R1VF478
16/32-BIT RISC FLASH MICROCONTROLLER
SPNS082D – JANUARY 2004 – REVISED JANUARY 2006
RST and PORRST timings
timing requirements for PORRST (see Figure 7)
NO.
VCCPORL
VCCPORH
VCCIOPORL
VCCIOPORH
VIL
VIL(PORRST)
3 tsu(PORRST)r
5 tsu(VCCIO)r
6 th(PORRST)r
7 tsu(PORRST)f
8
th(PORRST)rio
9 th(PORRST)d
10 tsu(PORRST)fio
11 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 VCCIO > VCCIOPORH
Hold time, PORRST active after VCC < VCCPORL
Setup time, PORRST active before VCCIO ≤ 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
VCCIOPORH
8
VCC
VCCPORH
6
VCCIOPORL
VCC
VCCP/VCCIO
PORRST
VCCPORL
5
3
VIL(PORRST) VIL
VCCIO
7
VCC
6 10
VCCIOPORH
11
VCCPORH
7
VCCPORL
VCCIOPORL
VIL
VIL
9
VIL VIL(PORRST)
Figure 7. PORRST Timing Diagram
switching characteristics over recommended operating conditions for RST†
tv(RST)
tfsu
PARAMETER
Valid time, RST active after PORRST inactive
Valid time, RST active (all others)
Flash start up time, from RST inactive to fetch of first instruction from flash
(flash pump stabilization time)
MIN
4112tc(OSC)
8tc(SYS)
836tc(OSC)
MAX UNIT
ns
ns
† 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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