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PRELIMINARY 21

8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER

AVDV1

Address (P0) Valid to Valid Data/Instruction In

@ 12 MHz

@ 16 MHz

243.2

160

4(1+M/2)

OSC

– 90

(3)

AVDV2

Address (P2) Valid to Valid Data/Instruction In

@ 12 MHz

@ 16 MHz

268.2

185

4(1+M/2)

OSC

– 65

(3)

AVDV3

Address (P0) Valid to Valid Instruction In

@ 12 MHz

@ 16 MHz

116.6

OSC

– 50

AVRL

(2) Address Valid to RD#/PSEN# Low

@ 12 MHz

@ 16 MHz

121.6

2(1+M)

OSC

– 45

(3)

AVWL1

Address (P0) Valid to WR# Low

@ 12 MHz

@ 16 MHz

126.6

2(1+M)

OSC

– 40

(3)

AVWL2

Address (P2) Valid to WR# Low

@ 12 MHz

@ 16 MHz

146.6

105

2(1+M)

OSC

– 20

(3)

WHQX

Data Hold after WR# High

@ 12 MHz

@ 16 MHz

63.3

42.5

OSC

– 20

QVWH

Data Valid to WR# High

@ 12 MHz

@ 16 MHz

138.6

2(1+N)

OSC

– 28

(4)

WHAX

WR# High to Address Hold

@ 12 MHz

@ 16 MHz

156.6

115

OSC

– 10

Table 11. AC Characteristics (Continued)

Symbol Parameter

@ Max F

osc

(1) F

osc

Variable

Units

Min Max Min Max

NOTES:

1. 16 MHz.

2. Specifications for PSEN# are identical to those for RD#.

3. In the formula, M=Number of wait states (0 or 1) for ALE.

4. In the formula, N=Number of wait states (0,1,2, or 3) for RD#/PSEN#/WR#.

5. “Typical” specifications are untested and not guaranteed.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 35 36

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