Key Features ........................................................................................................................................................4
PSD3XX Family Feature Summary ......................................................................................................................5
Partial Listing of Microcontrollers Supported ........................................................................................................6
I/O Port Functions ...............................................................................................................................................15
10.2 Port A (PA0-PA7).....................................................................................................................................16
10.2.1 Port A (PA0-PA7) in Multiplexed Address/Data Mode................................................................16
10.2.2 Port A (PA0-PA7) in Non-Multiplexed Address/Data Mode ........................................................17
10.3 Port B (PB0-PB7).....................................................................................................................................18
10.3.1 Port B (PA0-PA7) in Multiplexed Address/Data Mode................................................................18
10.3.2 Port B (PA0-PA7) in Non-Multiplexed Address/Data Mode ........................................................19
10.4 Port C (PC0-PC2) ....................................................................................................................................20
11.4 Programming and Erasure.......................................................................................................................21
Control Signals ...................................................................................................................................................22
12.1 ALE or AS ................................................................................................................................................22
12.2 WR or R/W...............................................................................................................................................22
12.3 RD/E/DS (DS option not available on 3X1 devices) ................................................................................22
12.4 PSEN or PSEN ........................................................................................................................................22
Program/Data Space and the 8031 ....................................................................................................................26
Systems Applications..........................................................................................................................................27
Power Management............................................................................................................................................30
16.2 CMiser Bit ................................................................................................................................................30
16.3 Turbo Bit (ZPSD Only).............................................................................................................................31
16.4 Number of Product Terms in the PAD Logic............................................................................................31
16.5 Composite Frequency of the Input Signals to the PAD Logic..................................................................32
16.6 Loading on I/O Pins .................................................................................................................................33
Calculating Power ...............................................................................................................................................34
18.1 Absolute Maximum Ratings .....................................................................................................................37
18.2 Operating Range .....................................................................................................................................37
18.5 AC/DC Characteristics – PSD3XX/ZPSD3XX (All 5 V devices) ..............................................................38
18.6 AC/DC Characteristics – PSD3XXV (3 V devices only)...........................................................................39
18.7 Timing Parameters – PSD3XX/ZPSD3XX (All 5 V devices)....................................................................40
18.8 Timing Parameters – ZPSD3XXV (3 V devices only) ..............................................................................42
18.9 Timing Diagrams for PSD3XX Parts.......................................................................................................44
18.10 AC Testing ...............................................................................................................................................65
Package Information ...........................................................................................................................................67
22.2 Part Number Construction .......................................................................................................................73
Data Sheet Revision History ...............................................................................................................................80
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Programmable Peripheral
PSD3XX Family
Field-Programmable Microcontroller Peripheral
1.0
Introduction
The low cost PSD3XX family integrates high-performance and user-configurable blocks of
EPROM, programmable logic, and optional SRAM into one part. The PSD3XX products
also provide a powerful microcontroller interface that eliminates the need for external
“glue logic”. The part’s integration, small form factor, low power consumption, and ease of
use make it the ideal part for interfacing to virtually any microcontroller.
The major functional blocks of the PSD3XX include:
•
Two programmable logic arrays
•
256Kb to 1 Mb of EPROM
•
Optional 16 Kb SRAM
•
Input latches
•
Programmable I/O ports
•
Page logic
•
Programmable security.
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The PSD3XX family architecture (Figure 1) can efficiently interface with, and enhance,
almost any 8- or 16-bit microcontroller system. This solution provides microcontrollers the
following:
•
Chip-select logic, control logic, and latched address signals that are otherwise
implemented discretely
•
Port expansion (reconstructs lost microcontroller I/O)
•
Expanded microcontroller address space (up to 16 times)
•
An EPROM (with security) and optional SRAM
•
Compatible with 8031-type architectures that use separate Program and Data Space
•
Interface to shared external resources.
1
PSD3XX Family
1.0
Introduction
(cont.)
The PSD3XX I/O ports can be used for:
•
Standard I/O ports
•
Programmable chip select outputs
•
Address inputs
•
Demultiplexed address outputs
•
A data bus port for non-multiplexed MCU applications
•
A data bus “repeater” port that shares and arbitrates the local MCU data bus with
external devices.
Implementing your design has never been easier than with PSDsoft —ST’s software
development suite. Using PSDsoft, you can do the following:
•
Configure your PSD3XX to work with virtually any microcontroller
•
Specify what you want implemented in the programmable logic using a high-level
Hardware Description Language (HDL)
•
Simulate your design
•
Download your design to the part using a programmer.
2.
Notation
For a complete product comparison, refer to Table 1.
PSD3XX
references the standard version of the PSD3XX family, which are ideal for
general-purpose embedded control applications.
PSD3XXR
SRAM-less version of the PSD3XX. If you don’t require the 16 Kb SRAM or
need a larger external SRAM, go with this part to save cost.
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Reference
PSD3XX
X
ZPSD3XX
has improved technology that helps reduce current consumption using the Turbo
bit. Excellent if you require a 5 V version of the PSD3XX that uses less power.
ZPSD3XXR
SRAM-less version of the ZPSD3XX.
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ZPSD3XXV
2.7 V to 5.5 V operation, ideal for very low-power and low-voltage
applications.
ZPSD3XXRV
SRAM-less version of the ZPSD3XXV.
Throughout this data sheet, references are made to the PSD3XX. In most cases, these
references also cover the entire family. Exceptions will be noted. References, such as
“3X1 only” cover all parts that have a 301 or 311 in the part number. Use the following table
to determine what references cover which product versions:
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