M40Z300
M40Z300W
5 V or 3 V NVRAM supervisor for up to 8 LPSRAMs
Not recommended for new design
Features
■
■
■
■
■
Converts low power SRAM into NVRAMs
Precision power monitoring and power
switching circuitry
Automatic WRITE-protection when V
CC
is out-
of-tolerance
Two-input decoder allows control for up to
8 SRAMs (with 2 devices active in parallel)
Choice of supply voltages and power-fail
deselect voltages:
– M40Z300:
V
CC
= 4.5 V to 5.5 V
THS = V
SS
: 4.5 V
≤
V
PFD
≤
4.75 V
THS = V
OUT
: 4.2 V
≤
V
PFD
≤
4.5 V
– M40Z300W:
V
CC
= 3.0 V to 3.6 V
THS = V
SS
: 2.8 V
≤
V
PFD
≤
3.0 V
V
CC
= 2.7 V to 3.3 V
THS = V
OUT
: 2.5 V
≤
V
PFD
≤
2.7 V
Reset output (RST) for power on reset
Battery low pin (BL)
Less than 12 ns chip enable access
propagation delay (for 5.0 V device)
Packaging includes a 28-lead SOIC and
SNAPHAT
®
top (to be ordered separately), or
A 16-lead SOIC
SOIC package provides direct connection for a
SNAPHAT top which contains the battery
RoHS compliant
– Lead-free second level interconnect
16
1
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■
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SO16 (MQ)
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SNAPHAT (SH)
crystal/battery
28
1
SOH28 (MH)
October 2010
Doc ID 5679 Rev 5
1/25
www.st.com
1
This is information on a product still in production but not recommended for new designs.
Contents
M40Z300, M40Z300W
Contents
1
2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
2.2
2.3
2.4
2.5
Two to four decode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Data retention lifetime calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power-on reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Battery low pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
V
CC
noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . 12
3
4
5
6
7
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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2/25
Doc ID 5679 Rev 5
M40Z300, M40Z300W
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Truth table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DC and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power down/up mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SOH28 – 28-lead plastic small outline, battery SNAPHAT, package mechanical data . . . 19
SH – 4-pin SNAPHAT housing for 48 mAh battery, package mechanical data . . . . . . . . . 20
SH – 4-pin SNAPHAT housing for 120 mAh battery, package mechanical data . . . . . . . . 21
SO16 – 16-lead plastic small outline, 150 mils body width, package mechanical data . . . 22
Ordering information example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SNAPHAT
®
battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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Doc ID 5679 Rev 5
3/25
List of figures
M40Z300, M40Z300W
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
28-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
M40Z300 16-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
M40Z300W 16-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Address-decode time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power-down timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power-up timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT, package outline . . . . 19
SH – 4-pin SNAPHAT housing for 48 mAh battery, package outline . . . . . . . . . . . . . . . . . 20
SH – 4-pin SNAPHAT housing for 120mAh battery, package outline. . . . . . . . . . . . . . . . . 21
SO16 – 16-lead plastic small outline, 150 mils body width, package outline . . . . . . . . . . . 22
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4/25
Doc ID 5679 Rev 5
M40Z300, M40Z300W
Description
1
Description
The M40Z300/W NVRAM supervisor is a self-contained device which converts a standard
low-power SRAM into a non-volatile memory. A precision voltage reference and comparator
monitors the V
CC
input for an out-of-tolerance condition.
When an invalid V
CC
condition occurs, the conditioned chip enable outputs (E1
CON
to
E4
CON
) are forced inactive to write-protect the stored data in the SRAM. During a power
failure, the SRAM is switched from the V
CC
pin to the lithium cell within the SNAPHAT
®
to
provide the energy required for data retention. On a subsequent power-up, the SRAM
remains write protected until a valid power condition returns.
The 28-pin, 330 mil SOIC provides sockets with gold plated contacts for direct connection to
a separate SNAPHAT housing containing the battery. The SNAPHAT housing has gold
plated pins which mate with the sockets, ensuring reliable connection. The housing is keyed
to prevent improper insertion. This unique design allows the SNAPHAT battery package to
be mounted on top of the SOIC package after the completion of the surface mount process
which greatly reduces the board manufacturing process complexity of either directly
soldering or inserting a battery into a soldered holder. Providing non-volatility becomes a
“SNAP.” The 16-pin SOIC provides battery pins for an external user-supplied battery.
Insertion of the SNAPHAT housing after reflow prevents potential battery damage due to the
high temperatures required for device surface-mounting. The SNAPHAT housing is also
keyed to prevent reverse insertion.
The 28-pin SOIC and battery packages are shipped separately in plastic anti-static tubes or
in tape & reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT) part
number is “M4ZXX-BR00SH”.
Caution:
Do not place the SNAPHAT battery top in conductive foam, as this will drain the lithium
button-cell battery.
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Doc ID 5679 Rev 5
5/25
微控制器 MCU
