PSD834F2-90M STMicroelectronics, PSD834F2-90M Datasheet - Page 64
![IC FLASH 2MBIT 90NS 52QFP](/photos/7/25/72513/497-52-pqfp_series_sml.jpg)
PSD834F2-90M
Manufacturer Part Number
PSD834F2-90M
Description
IC FLASH 2MBIT 90NS 52QFP
Manufacturer
STMicroelectronics
Datasheet
1.PSD813F2VA-20JI.pdf
(109 pages)
Specifications of PSD834F2-90M
Format - Memory
FLASH
Memory Type
FLASH
Memory Size
2M (256K x 8)
Speed
90ns
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Package / Case
52-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-2008
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PSD813F2V, PSD854F2V
For Users of the HC11 (or compatible)
The HC11 turns off its E clock when it sleeps.
Therefore, if you are using an HC11 (or compati-
ble) in your design, and you wish to use the Pow-
er-down mode, you must not connect the E clock
to CLKIN (PD1). You should instead connect a
crystal oscillator to CLKIN (PD1). The crystal oscil-
lator frequency must be less than 15 times the fre-
quency of AS. The reason for this is that if the
frequency is greater than 15 times the frequency
of AS, the PSD keeps going into Power-down
mode.
Other Power Saving Options
The PSD offers other reduced power saving op-
tions that are independent of the Power-down
mode. Except for the PSD Chip Select Input (CSI,
PD2) feature, they are enabled by setting bits in
PMMR0 and PMMR2.
64/109
Doc ID 10552 Rev 3
Figure 33. Enable Power-down Flow Chart
PLD Power Management
The power and speed of the PLDs are controlled
by the Turbo Bit (Bit 3) in PMMR0. By setting the
bit to '1,' the Turbo mode is off and the PLDs con-
sume the specified standby current when the in-
puts are not switching for an extended time of
70ns. The propagation delay time is increased by
10ns after the Turbo Bit is set to '1' (turned off)
when the inputs change at a composite frequency
of less than 15 MHz. When the Turbo Bit is reset
to '0' (turned on), the PLDs run at full power and
speed. The Turbo Bit affects the PLD’s DC power,
AC power, and propagation delay.
Blocking MCU control signals with the bits of
PMMR2 can further reduce PLD AC power con-
sumption.
No
by setting PMMR0 bits 4 and 5
Disable desired inputs to PLD
and PMMR2 bits 2 through 6.
Set PMMR0 Bit 1 = 1
PSD in Power
OPTIONAL
for 15 CLKIN
Enable APD
ALE/AS idle
Down Mode
clocks?
RESET
Yes
AI02892