PSD4235G2-90U STMicroelectronics, PSD4235G2-90U Datasheet - Page 90

• Manufacturer Part Number: PSD4235G2-90U
• Description: IC FLASH 4MBIT 90NS 80TQFP
• Manufacturer: STMicroelectronics

Specifications of PSD4235G2-90U

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (512K x 8)
• Speed: 90ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-1968

I/O ports
Figure 28. Port A, B and C structure
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MCELLA7-MCELLA0 (Port A)
MCELLB7-MCELLB0 (Port B)
Ext.CS (Port C)
ENABLE PRODUCT TERM ( .OE )
WR
WR
Port D - functionality and structure
Port D has four I/O pins. See
the following functions:
●
●
Port D pins can be configured in PSDsoft Express as input pins for other dedicated
functions:
●
●
●
●
MCU I/O mode
CPLD input - direct input to the CPLD, no input macrocells (IMC)
Address Strobe (ALE/AS, PD0)
CLKIN (PD1) as input to the macrocells Flip-flops and APD counter
PSD Chip Select input (CSI, PD2). Driving this signal high disables the Flash memory,
SRAM and CSIOP.
Write Enable high-byte (WRH, PD3) input, or as DBE input from a MC68HC912.
CPLD-INPUT
DIR Register
DATA OUT
READ MUX
Register
D
D
P
D
B
Q
Q
Figure
29. Port D can be configured to perform one or more of
DATA OUT
DATA IN
OUTPUT
MUX
ENABLE OUT
MACROCELL
INPUT
PSD4235G2
PORT Pin
AI04936B