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M40Z300WMH 반도체 회로 부품 판매점

NVRAM CONTROLLER for up to EIGHT LPSRAM



ST Microelectronics 로고
ST Microelectronics
M40Z300WMH 데이터시트, 핀배열, 회로
M40Z300
M40Z300W
NVRAM CONTROLLER for up to EIGHT LPSRAM
s CONVERT LOW POWER SRAMs into
NVRAMs
s PRECISION POWER MONITORING and
POWER SWITCHING CIRCUITRY
s AUTOMATIC WRITE-PROTECTION when VCC
is OUT-OF-TOLERANCE
s TWO INPUT DECODER ALLOWS CONTROL
for up to 8 SRAMs (with 2 devices active in
parallel)
s CHOICE of SUPPLY VOLTAGES and
POWER-FAIL DESELECT VOLTAGES:
– M40Z300:
VCC = 4.5V to 5.5V
THS = VSS 4.5V VPFD 4.75V
THS = VOUT 4.2V VPFD 4.5V
– M40Z300W:
VCC = 3.0V to 3.6V
THS = VSS 2.8V VPFD 3.0V
VCC = 2.7V to 3.3V
THS = VOUT 2.5 VPFD 2.7V
s RESET OUTPUT (RST) for POWER ON
RESET
s LESS THAN 12ns CHIP ENABLE ACCESS
PROPAGATION DELAY (for 5.0V device)
s PACKAGING INCLUDES a 28-LEAD SOIC
and SNAPHAT® TOP, or a 16-LEAD SOIC
(to be Ordered Separately)
s SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT TOP which
CONTAINS the BATTERY
s BATTERY LOW PIN (BL)
DESCRIPTION
The M40Z300/W NVRAM Controller is a self-con-
tained device which converts a standard low-pow-
er SRAM into a non-volatile memory. A precision
voltage reference and comparator monitors the
VCC input for an out-of-tolerance condition.
SNAPHAT (SH)
Battery
28
1
SOH28 (MH)
16
1
SO16 (MQ)
Figure 1. Logic Diagram
VCC B+(1)
THS
E
B
A
M40Z300
M40Z300W
VOUT
BL
E1CON
E2CON
E3CON
E4CON
RST
VSS B–(1)
NOTE: 1. For 16-pin SOIC package only.
AI02242
March 2000
1/16


M40Z300WMH 데이터시트, 핀배열, 회로
M40Z300, M40Z300W
Figure 2A. SOIC28 Connections
VOUT
NC
NC
RST
NC
A
NC
B
NC
BL
NC
NC
THS
VSS
1 28
2 27
3 26
4 25
5 24
6 23
7 M40Z300 22
8 M40Z300W 21
9 20
10 19
11 18
12 17
13 16
14 15
AI02243
VCC
E
NC
NC
NC
E1CON
E2CON
NC
E3CON
NC
NC
NC
E4CON
NC
Figure 2B. SOIC16 Connections
VOUT
NC
RST
A
B
BL
THS
VSS
1 16
2 15
3 14
4 M40Z300 13
5 M40Z300W 12
6 11
7 10
89
( ) = M40Z300W
VCC
B+ (B–)
E
E1CON
E2CON
E3CON
E4CON
B– (B+)
AI03624
Table 1. Signal Names
THS
Threshold Select Input
E Chip Enable Input
E1CON-E4CON
Conditioned Chip Enable Output
A, B Decoder Inputs
RST
Reset Output (Open Drain)
BL Battery Low Output (Open Drain)
VOUT
Supply Voltage Output
VCC Supply Voltage
VSS Ground
B+ Positive Battery Pin
B– Negative Battery Pin
NC Not Connected Internally
When an invalid VCC condition occurs, the condi-
tioned chip enable outputs (E1CON to E4CON ) are
forced inactive to write-protect the stored data in
the SRAM. During a power failure, the SRAM is
switched from the VCC 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 sep-
arate 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 im-
proper 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 sol-
dered holder. Providing non-volatility becomes a
"SNAP".
The 16 pin SOIC provides battery pins for an ex-
ternal user supplied battery.
2/16




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M40Z300WMH controller

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