PSD303B-70M STMicroelectronics, PSD303B-70M Datasheet - Page 51

• Manufacturer Part Number: PSD303B-70M
• Description: MCU 8BIT PROGRM 70NS 44-PQFP
• Manufacturer: STMicroelectronics

Specifications of PSD303B-70M

• Applications: *
• Interface: *
• Voltage - Supply: *
• Package / Case: 44-MQFP, 44-PQFP
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 24. Timing of 16-Bit Multiplexed Address/Data Bus Using RD, WR (PSD3X1)
48
PSD3XX Family
Multiplexed
PA0-PA7 Pins
PAD Input
BHE/PSEN
RD/E as RD
WR/V
R/W as WR
Active High
as Address
Active Low
A15/AD15
See referenced notes on page 64.
Inputs
as I/O Pin
PB0-PB7
as I/O Pin
PA0-PA7
Direct
as BHE
A0/AD0-
CSI/A19
Outputs
Any of
as CSI
Any of
Any of
PP
ALE
ALE
(1)
(2)
or
1
23
2
ADDRESS A
3
STABLE INPUT
7
6
6
5
8
4
ADDRESS A
READ CYCLE
18
12
INPUT
INPUT
DATA VALID
10
9
32
19
13
23
1
2
ADDRESS B
STABLE INPUT
36
14
WRITE CYCLE
3
15
11
14
ADDRESS B
16
32
32
12A
17
13
20
DATA
IN
OUTPUT
OUTPUT