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UPSD3212C Datasheet, PDF (131/152 Pages) STMicroelectronics – Flash Programmable System Devices with 8032 Microcontroller Core and 16Kbit SRAM | |||
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UPSD3212C, UPSD3212CV
Table 95. External Data Memory AC Characteristics (with the 5V MCU Module)
Symbol
Parameter(1)
40MHz Oscillator
Min
Max
Variable Oscillator
1/tCLCL = 24 to 40MHz
Unit
Min
Max
tRLRH
RD pulse width
120
6tCLCL â 30
ns
tWLWH WR pulse width
120
6tCLCL â 30
ns
tLLAX2 Address hold after ALE
10
tCLCL â 15
ns
tRHDX RD to valid data in
75
5tCLCL â 50 ns
tRHDX Data hold after RD
0
0
ns
tRHDZ Data float after RD
38
2tCLCL â 12 ns
tLLDV
ALE to valid data in
150
8tCLCL â 50 ns
tAVDV
Address to valid data in
150
9tCLCL â 75 ns
tLLWL
ALE to WR or RD
60
90
3tCLCL â 15 tCLCL + 15 ns
tAVWL Address valid to WR or RD
70
4tCLCL â 30
ns
tWHLH WR or RD High to ALE High
10
40
tCLCL â 15
tCLCL + 15
ns
tQVWX Data valid to WR transition
5
tCLCL â 20
ns
tQVWH Data set up before WR
125
7tCLCL â 50
ns
tWHQX Data hold after WR
5
tCLCL â 20
ns
tRLAZ
Address float after RD
0
0
ns
Note: 1. Conditions (in addition to those in Table 86, VCC = 4.5 to 5.5V): VSS = 0V; CL for Port 0, ALE and PSEN output is 100pF; CL for
other outputs is 80pF
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