ST M40SZ100Y, M40SZ100W User Manual

M40SZ100Y

M40SZ100W

5 V or 3 V NVRAM supervisor for LPSRAM

Features

■ Convert low power SRAMs into NVRAMs

■ 5 V or 3 V operating voltage

■ Precision power monitoring and power

switching circuitry

■ Automatic write-protection when V

tolerance

■ Choice of supply voltages and power-fail

deselect voltages:
– M40SZ100Y: V

4.20 V ≤ V

PFD

= 4.5 to 5.5 V;

CC

≤ 4.50 V
(contact local ST sales office for
availability)

– M40SZ100W: V

2.55 V ≤ V

■ Reset output (RST) for power on reset

■ 1.25 V reference (for PFI/PFO)

■ Less than 10 ns chip enable access

PFD

= 2.7 to 3.6 V;

CC

≤ 2.70 V

propagation delay (at 5 V)

■ Optional packaging includes a 28-lead SOIC

and SNAPHAT

■ 28-lead SOIC package provides direct

®

top (to be ordered separately)

connection for a SNAPHAT top which contains
the battery (contact local ST sales office for
availability)

■ Battery low pin (BL)

■ RoHS compliant

– Lead-free second level interconnect

is out-of-

CC

16

1

SO16 (MQ)

SNAPHAT (SH) battery

28

1

SOH28 (MH)

October 2010 Doc ID 7528 Rev 3 1/24

www.st.com

1

Contents M40SZ100Y, M40SZ100W

Contents

1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Data retention lifetime calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 Power-on reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3 Reset input (RSTIN

2.4 Battery low pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.5 Power-fail input/output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.6 V

noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . 13

CC

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2/24 Doc ID 7528 Rev 3

M40SZ100Y, M40SZ100W List of tables

List of tables

Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 3. Reset AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 5. DC and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 6. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 7. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 8. SO16 – 16-lead plastic small outline package mechanical data. . . . . . . . . . . . . . . . . . . . . 18

Table 9. SOH28 – 28-lead plastic small outline, battery SNAPHAT, pack. mech. data . . . . . . . . . . 19

Table 10. SH – 4-pin SNAPHAT housing for 48 mAh battery, package mechanical data . . . . . . . . . 20

Table 11. SH – 4-pin SNAPHAT housing for 120 mAh battery, package mechanical data . . . . . . . . 21

Table 12. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 13. SNAPHAT

Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

®

battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Doc ID 7528 Rev 3 3/24

List of figures M40SZ100Y, M40SZ100W

List of figures

Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. SOIC16 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. SOIC28 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 5. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 6. Power down timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 7. Power up timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 8. RSTIN

Figure 9. Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 10. AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 11. AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 12. SO16 – 16-lead plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 13. SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT, package outline . . . . 19

Figure 14. SH – 4-pin SNAPHAT housing for 48 mAh battery, package outline . . . . . . . . . . . . . . . . . 20

Figure 15. SH – 4-pin SNAPHAT housing for 120 mAh battery, package outline . . . . . . . . . . . . . . . . 21

timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4/24 Doc ID 7528 Rev 3

M40SZ100Y, M40SZ100W Description

1 Description

The M40SZ100Y/W NVRAM controller 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

When an invalid V
inactive to write protect the stored data in the SRAM. During a power failure, the SRAM is
switched from the V
the 16-lead SOIC) to provide the energy required for data retention. On a subsequent
power-up, the SRAM remains write protected until a valid power condition returns.

input for an out-of-tolerance condition.

CC

condition occurs, the conditioned chip enable output (E

CC

pin to the lithium cell within the SNAPHAT® (or external battery for

CC

) is forced

CON

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.” This feature is also available in the “topless” 16-pin SOIC package (MQ).

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 M4Z28-BR00SH (for 48 mAh battery)

or M4Z32-BR00SH (for 120 mAh battery).

Caution: Do not place the SNAPHAT battery top in conductive foam, as this will drain the lithium

button-cell battery.

Figure 1. Logic diagram

(1)

V

V

CC

BAT

RSTIN

1. For 16-pin SOIC package only.

V

OUT

E

PFI

Doc ID 7528 Rev 3 5/24

M40SZ100Y

M40SZ100W

V

SS

BL

E

CON

PFO

RST

AI03933

Description M40SZ100Y, M40SZ100W

Table 1. Signal names

E Chip enable input

E

CON

Conditioned chip enable output

RST Reset output (open drain)

RSTIN Reset input

BL Battery low output (open drain)

V

V

V

BAT

OUT

CC

(1)

Supply voltage output

Supply voltage

Backup supply voltage

PFI Power fail input

PFO Power fail output

V

SS

Ground

NC Not connected internally

1. For SO16 only.

Figure 2. SOIC16 connections

NC
NC

RST

NC

RSTIN

PFO

V

BAT

V

SS

V

1
2
3
4

M40SZ100Y

M40SZ100W

5
6
710
8

16
15
14
13
12
11

CC
NC
V

OUT
NC

PFI
BL

E

9

E

CON

AI03935

6/24 Doc ID 7528 Rev 3

M40SZ100Y, M40SZ100W Description

Figure 3. SOIC28 connections

Figure 4. Block diagram

V

CC

V

BAT

BL
NC
NC
NC
NC
NC
NC
NC

RSTIN

NC
NC

PFO

V

SS

VBL= 2.5V

1
2
3
4
5
6
7

M40SZ100Y

M40SZ100W

8
9
10
11
12
13
14

COMPARE

28
27
26
25
24
23
22
21
20
19
18
17
16
15

V

CC

NC
NC
V

OUT

NC
NC
PFI
NC

E
NC
RST
NCNC
NC
E

CON

V

BL

AI03934

OUT

(1)

RSTIN

E

PFI

1.25V

1. Open drain output

V

V

PFD

= 2.5V

SO

= 4.4V

(2.65V for SZ100W)

COMPARE

COMPARE

COMPARE

POR

RST

E

CON

PFO

(1)

AI04766

Doc ID 7528 Rev 3 7/24

Description M40SZ100Y, M40SZ100W

Figure 5. Hardware hookup

3.0V, 3.3V or 5V

Unregulated

Voltage

R1

R2

Regulator

V

IN

1. User supplied for the 16-pin package

V

CC

0.1µF

From Microprocessor

V

CC

E

RSTIN

PFI

V

SS

V

BAT

V

OUT

M40SZ100Y

M40SZ100W

E

CON

PFO

RST

(1)

BL

V

CC

0.1µF

To Microprocessor NMI

To Microprocessor Reset

To Battery Monitor Circuit

1Mb or 4Mb

LPSRAM

E

AI04767

8/24 Doc ID 7528 Rev 3