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TMS370Cx36
8-BIT MICROCONTROLLER
SPNS039B – JANUARY 1996 – REVISED FEBRUARY 1997
41
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
switching characteristics and timing requirements
(see Note 11 and Figure 18)
NO.
PARAMETER
MIN
200
MAX
2000
UNIT
5
tc
Cycle time SYSCLK (system clock)
Cycle time, SYSCLK (system clock)
Divide by 4
ns
Divide by 1
200
500
6
tw(SCL)
tw(SCH)
Pulse duration, SYSCLK low
0.5 tc–20
0.5 tc
0.5 tc
0.5 tc + 20
ns
7
Pulse duration, SYSCLK high
ns
NOTE 11: tc = system clock cycle time = 1/SYSCLK
SYSCLK
5
6
7
Figure 18. SYSCLK Timing
general purpose output signal switching time requirements (see Figure 19)
MIN
TYP
MAX
UNIT
tr
tf
Rise time
30
ns
Fall time
30
ns
tf
tr
Figure 19. Signal Switching Timing
recommended EEPROM timing requirements for programming
MIN
10
MAX
UNIT
ms
tw(PGM)B
tw(PGM)AR
Pulse duration, programming signal to ensure valid data is stored (byte mode)
Pulse duration, programming signal to ensure valid data is stored (array mode)
20
ms
recommended EPROM operating conditions for programming
MIN
TYP
MAX
UNIT
VCC
VPP
IPP
Supply voltage
4.75
5.5
6
V
Supply voltage at MC pin
13
13.2
13.5
V
Supply current at MC pin during programming (VPP = 13 V)
30
50
mA
SYSCLK
System clock
Divide by 4
0.5
5
MHz
Divide by 1
2
5
recommended EPROM timing requirements for programming
MIN
TYP
MAX
UNIT
tw(EPGM)
NOTE 12: Programming pulse is active when both EXE (EPCTL.0) and VPPS (EPCTL.6) are set.
Pulse duration, programming signal (see Note 12)
0.40
0.50
3
ms