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UPSD325X Datasheet(PDF) 152 Page - STMicroelectronics

Part # UPSD325X
Description  Flash Programmable System Devices with 8032 Microcontroller Core and 256Kbit SRAM
PDF  176 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD325X Datasheet(HTML) 152 Page - STMicroelectronics

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µPSD325X DEVICES
152/176
Figure 75. External Program Memory READ Cycle
Table 114. External Program Memory AC Characteristics (with the 5V MCU Module)
Note: 1. Conditions (in addition to those in Table 109, VCC = 4.5 to 5.5V): VSS = 0V; CL for Port 0, ALE and PSEN output is 100pF; CL for
other outputs is 80pF
2. Interfacing the µPSD325X devices to devices with float times up to 20ns is permissible. This limited bus contention does not cause
any damage to Port 0 drivers.
Symbol
Parameter1
40MHz Oscillator
Variable Oscillator
1/tCLCL = 24 to 40MHz
Unit
Min
Max
Min
Max
tLHLL
ALE pulse width
35
2tCLCL – 15
ns
tAVLL
Address set-up to ALE
10
tCLCL – 15
ns
tLLAX
Address hold after ALE
10
tCLCL – 15
ns
tLLIV
ALE Low to valid instruction in
55
4tCLCL – 45
ns
tLLPL
ALE to PSEN
10
tCLCL – 15
ns
tPLPH
PSEN pulse width
60
3tCLCL – 15
ns
tPLIV
PSEN to valid instruction in
30
3tCLCL – 45
ns
tPXIX
Input instruction hold after PSEN
00
ns
tPXIZ
2
Input instruction float after PSEN
15
tCLCL – 10
ns
tPXAV
2
Address valid after PSEN
20
tCLCL – 5
ns
tAVIV
Address to valid instruction in
70
5tCLCL – 55
ns
tAZPL
Address float to PSEN
–5
–5
ns
tAVLL
tPLPH
tPXIZ
tAVIV
PSEN
PORT 2
PORT 0
AI06848
tLHLL
ALE
tLLPL
A0-A7
tLLAX
tAZPL
tLLIV
tPLIV
A0-A7
tPXAV
tPXIX
A8-A11
INSTR
IN
A8-A11



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