PSD4235G2-90U STMicroelectronics, PSD4235G2-90U Datasheet - Page 107

• 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

PSD4235G2
Table 54.
1. This is the operating power with no Flash memory Program or Erase cycles in progress. Calculation is based on
MCU ALE frequency (Freq ALE)
I
CC
I
OUT
total
=0 mA.
(Freq PLD)
% Flash memory Access
% SRAM access
% I/O access
% Normal
% Power-down mode
(from fitter report)
% of total product terms
Turbo Mode
Example of PSD typical power calculation at V
Highest Composite PLD input frequency
Calculation (using typical values)
= 45 PT
= 45/193 = 23.3%
= 8 MHz
= 4 MHz
= 80%
= 15%
= 5% (no additional power above base)
= 10%
= 90%
= ON
= Ipwrdown x %pwrdown + %normal x (I
= Ipwrdown x %pwrdown + % normal x (%flash x 2.5 mA/MHz x Freq ALE
= 50µA x 0.90 + 0.1 x (0.8 x 2.5 mA/MHz x 4 MHz
= 45µA + 0.1 x (8 + 0.9 + 16 + 18 mA)
= 45µA + 0.1 x 42.9
= 45µA + 4.29 mA
= 4.34 mA
Number of product terms used
Operational Modes
Conditions
+ %SRAM x 1.5 mA/MHz x Freq ALE
+ % PLD x 2 mA/MHz x Freq PLD
+ #PT x 400µA/PT)
+ 0.15 x 1.5 mA/MHz x 4 MHz
+ 2 mA/MHz x 8 MHz
+ 45 x 0.4 mA/PT)
CC
= 5.0V (with Turbo mode on)
CC
(ac) + I
DC and AC parameters
CC
(dc))
(1)
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