M48Z58
M48Z58Y
5 V, 64 Kbit (8 Kbit x 8) ZEROPOWER
®
SRAM
Features
■
■
■
■
Integrated, ultra low power SRAM, power-fail
control circuit, and battery
READ cycle time equals WRITE cycle time
Automatic power-fail chip deselect and WRITE
protection
WRITE protect voltages:
(V
PFD
= power-fail deselect voltage)
– M48Z58: V
CC
= 4.75 to 5.5 V;
4.5 V
≤
V
PFD
≤
4.75 V
– M48Z58Y: V
CC
= 4.5 to 5.5 V;
4.2 V
≤
V
PFD
≤
4.5 V
Self-contained battery in the CAPHAT
™
DIP
package
Packaging includes a 28-lead SOIC and
SNAPHAT
®
top (to be ordered separately)
SOIC package provides direct connection for a
SNAPHAT
®
top which contains the battery
Pin and function compatible with JEDEC
standard 8 Kbit x 8 SRAMs
RoHS compliant
– Lead-free second level interconnect
28
1
28
1
PCDIP28
battery CAPHAT™
SNAPHAT
®
battery
■
■
■
■
■
SOH28
June 2011
Doc ID 2559 Rev 11
1/24
www.st.com
1
Contents
M48Z58, M48Z58Y
Contents
1
2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
2.2
2.3
2.4
READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
V
CC
noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . 12
3
4
5
6
7
8
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2/24
Doc ID 2559 Rev 11
M48Z58, M48Z58Y
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.
Table 15.
Table 16.
Table 17.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
READ mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
WRITE mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, pack. mech. data . . . . . . . . . . . . . . . . 17
SOH28 – 28-lead plastic small outline, battery SNAPHAT
®
, pack. mech. data . . . . . . . . . 18
SH – 4-pin SNAPHAT
®
housing for 48 mAh battery, package mech. data . . . . . . . . . . . . 19
SH – 4-pin SNAPHAT
®
housing for 120 mAh battery, pack. mech. data . . . . . . . . . . . . . . 20
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SNAPHAT
®
battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Doc ID 2559 Rev 11
3/24
List of figures
M48Z58, M48Z58Y
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.
Figure 15.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
READ mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
WRITE enable controlled, WRITE mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chip enable controlled, WRITE mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
AC measurement load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package outline . . . . . . . . . . . . . . . . . 17
SOH28 – 28-lead plastic small outline, battery SNAPHAT
®
, pack. outline. . . . . . . . . . . . . 18
SH – 4-pin SNAPHAT
®
housing for 48 mAh battery, package outline . . . . . . . . . . . . . . . . 19
SH – 4-pin SNAPHAT
®
housing for 120 mAh battery, package outline . . . . . . . . . . . . . . . 20
Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4/24
Doc ID 2559 Rev 11
M48Z58, M48Z58Y
Description
1
Description
The M48Z58/Y ZEROPOWER
®
RAM is an 8 Kbit x 8 non-volatile static RAM that integrates
power-fail deselect circuitry and battery control logic on a single die. The monolithic chip is
available in two special packages to provide a highly integrated battery-backed memory
solution.
The M48Z58/Y is a non-volatile pin and function equivalent to any JEDEC standard 8 K x 8
SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the
non-volatility of PROMs without any requirement for special WRITE timing or limitations on
the number of WRITEs that can be performed.
The 28-pin, 600 mil DIP CAPHAT
™
houses the M48Z58/Y silicon with a long life lithium
button cell in a single package.
The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct
connection to a separate SNAPHAT
®
housing containing the battery. The unique design
allows the SNAPHAT battery package to be mounted on top of the SOIC package after the
completion of the surface mount process. 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 keyed to prevent reverse insertion.
The SOIC and battery packages are shipped separately in plastic anti-static tubes or in tape
& reel form.
For the 28-lead SOIC, the battery package (e.g., SNAPHAT) part number is “M4Z28-
BR00SH1”.
Figure 1.
Logic diagram
VCC
13
A0-A12
8
DQ0-DQ7
W
E
G
M48Z58
M48Z58Y
V
SS
AI01176B
Doc ID 2559 Rev 11
5/24
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