M40Z111MH6 STMICROELECTRONICS [STMicroelectronics], M40Z111MH6 Datasheet - Page 9

• Manufacturer Part Number: M40Z111MH6
• Description: 5V OR 3V NVRAM SUPERVISOR FOR UP TO TWO LPSRAMs
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 6. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
V
I
switching, can produce voltage fluctuations, re-
sulting in spikes on the V
can be reduced if capacitors are used to store en-
ergy which stabilizes the V
stored in the bypass capacitors will be released as
low going spikes are generated or energy will be
absorbed when overshoots occur. A ceramic by-
pass capacitor value of 0.1µF (as shown in Figure
8) is recommended in order to provide the needed
filtering.
In addition to transients that are caused by normal
SRAM operation, power cycling can generate neg-
ative voltage spikes on V
below V
spikes can cause data corruption in the SRAM
while in battery backup mode. To protect from
these voltage spikes, STMicroelectronics recom-
mends connecting a schottky diode from V
V
Schottky diode 1N5817 is recommended for
through hole and MBRS120T3 is recommended
for surface mount.
CC
CC
SS
Symbol
transients, including those produced by output
t
t
t
t
t
t
ER
FB
Noise And Negative Going Transients
(cathode connected to V
EDH
WPT
2. V
3. V
4. t
t
F
EDL
t
RB
R
(2)
(3)
(4)
passes V
ER
SS
PFD
PFD
(min) = 20ms for Industrial Temperature Range - Grade 6 device.
by as much as one volt. These negative
(min) to V
(max) to V
V
V
V
V
Chip Enable Propagation Delay
Chip Enable Propagation Delay
Chip Enable Recovery
Write Protect Time
PFD
PFD
PFD
PFD
SS
(min).
to V
(min) to V
(max) to V
(min) to V
SS
PFD
PFD
fall time of less than tFB may cause corruption of RAM data.
(min) fall time of less than tF may result in deselection/write protection not occurring until 200 µs after V
(min) V
CC
CC
PFD
SS
PFD
bus. These transients
CC
that drive it to values
V
CC
(max) V
CC
CC
(min) V
bus. The energy
, anode to V
Fall Time
Rise Time
Parameter
CC
CC
A
Rise Time
Fall Time
= –40 to 85°C; V
CC
(1)
SS
to
).
CC
Figure 8. Supply Voltage Protection
= 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
M40Z111W
M40Z111W
M40Z111W
M40Z111
M40Z111
M40Z111
V CC
0.1 F
Min
300
10
10
40
40
40
1
M40Z111, M40Z111W
Max
200
150
250
V CC
V SS
15
20
10
20
DEVICE
AI00622
Unit
ms
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
9/15
CC