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M40Z300MQ1 Datasheet(PDF) 8 Page - STMicroelectronics

Part # M40Z300MQ1
Description  NVRAM CONTROLLER for up to EIGHT LPSRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M40Z300MQ1 Datasheet(HTML) 8 Page - STMicroelectronics

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Table 7. Power Down/Up AC Characteristics
(TA = 0 to 70°C)
Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200 µs after
VCC passes VPFD (min)..
2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
Symbol
Parameter
Min
Max
Unit
tF
(1)
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
tFB
(2)
VPFD (min) to VSS VCC Fall Time
150
µs
tR
VPFD(min) to VPFD (max) VCC Rise Time
10
µs
tEDL
Chip Enable Propagation Delay Low
M40Z300
12
ns
M40Z300W
20
ns
tEDH
Chip Enable Propagation Delay High
M40Z300
10
ns
M40Z300W
20
ns
tAS
A, B set up to E
0ns
tCER
Chip Enable Recovery
40
120
ms
tREC
VPFD (max) to RST High
40
120
ms
tWPT
Write Protect Time
M40Z300
40
150
µs
M40Z300W
40
250
µs
tRB
VSS to VPFD (min) VCC Rise Time
1µs
BATTERY LOW PIN
The M40Z300/W automatically performs battery
voltage monitoring upon power-up, and at factory-
programmed time intervals of at least 24 hours.
The Battery Low (BL) pin will be asserted if the
battery voltage is found to be less than approxi-
mately 2.5V. The BL pin will remain asserted until
completion of battery replacement and subse-
quent battery low monitoring tests, either during
the next power-up sequence or the next scheduled
24-hour interval.
If a battery low is generated during a power-up se-
quence, this indicates that the battery is below
2.5V and may not be able to maintain data integrity
in the SRAM. Data should be considered suspect,
and verified as correct. A fresh battery should be
installed.
If a battery low indication is generated during the
24-hour interval check, this indicates that the bat-
tery is near end of life. However, data is not com-
promised due to the fact that a nominal VCC is
supplied. In order to insure data integrity during
subsequent periods of battery back-up mode, the
battery should be replaced. SNAPHAT top should
be replaced with valid VCC applied to the device.
The M40Z300/W only monitors the battery when a
nominal VCC is applied to the device. Thus appli-
cations which require extensive durations in the
battery back-up mode should be powered-up peri-
odically (at least once every few months) in order
for this technique to be beneficial. Additionally, if a
battery low is indicated, data integrity should be
verified upon power-up via a checksum or other
technique. The BL pin is an open drain output and
an appropriate pull-up resistor to VCC should be
chosen to control the rise time.


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