M48Z35AY
M48Z35AV
5.0 or 3.3V, 256 Kbit (32 Kbit x8) ZEROPOWER
®
SRAM
FEATURES SUMMARY
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■
■
■
■
■
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INTEGRATED, ULTRA LOW POWER SRAM,
POWER-FAIL CONTROL CIRCUIT, AND
BATTERY
READ CYCLE TIME EQUALS WRITE CYCLE
TIME
BATTERY LOW FLAG (BOK)
AUTOMATIC POWER-FAIL CHIP
DESELECT AND WRITE PROTECTION
WRITE PROTECT VOLTAGES:
(V
PFD
= Power-fail Deselect Voltage)
– M48Z35AY: 4.2V
≤
V
PFD
≤
4.5V
– M48Z35AV: 2.7V
≤
V
PFD
≤
3.0V
SELF-CONTAINED BATTERY IN THE
CAPHAT™ DIP PACKAGE
PACKAGING INCLUDES A 28-LEAD SOIC
AND SNAPHAT
®
TOP (to be ordered
separately)
PIN and FUNCTION COMPATIBLE WITH
JEDEC STANDARD 32K x 8 SRAMs
SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP
WHICH CONTAINS THE BATTERY
Figure 1. 28-pin, CAPHAT™ DIP Package
28
1
PCDIP28 (PC)
Battery CAPHAT
Figure 2. 28-pin SOIC Package
SNAPHAT (SH)
Battery
28
1
SOH28 (MH)
March 2004
1/21
M48Z35AY, M48Z35AV
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. 28-pin, CAPHAT™ DIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. 28-pin SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 3.
Table 1.
Figure 4.
Figure 5.
Figure 6.
Logic Diagram . . . . . . . . . . . . . . . . . . . . .
Signal Names . . . . . . . . . . . . . . . . . . . . .
DIP Connections . . . . . . . . . . . . . . . . . . .
SOIC Connections . . . . . . . . . . . . . . . . . .
Block Diagram . . . . . . . . . . . . . . . . . . . . .
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.....4
.....4
.....5
.....5
.....5
OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 2. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
READ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 7. READ Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. READ Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WRITE Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 8. WRITE Enable Controlled, WRITE Mode AC Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9. Chip Enable Controlled, WRITE Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. WRITE Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Data Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10.BOK Check Routine Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
V
CC
Noise And Negative Going Transients. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11.Supply Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 5. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 6. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 12.AC Measurement Load Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 7. Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 13.Power Down/Up Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 9. Power Down/Up AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 10. Power Down/Up Trip Points DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 14.PCDIP28 – 28-pin Plastic DIP, battery CAPHAT™, Package Outline . . . . . . . . . . . . . . 15
Table 11. PMDIP28 – 28-pin Plastic DIP, battery CAPHAT™, Package Mechanical Data. . . . . . . 15
Figure 15.SOH28 – 28-lead Plastic Small Outline, battery SNAPHAT, Package Outline . . . . . . . . 16
Table 12. SOH28 – 28-lead Plastic Small Outline, battery SNAPHAT, Package Mechanical Data 16
Figure 16.SH – 4-pin SNAPHAT Housing for 48mAh Battery, Package Outline . . . . . . . . . . . . . . . 17
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M48Z35AY, M48Z35AV
Table 13. SH – 4-pin SNAPHAT Housing for 48mAh Battery, Package Mechanical Data . . . . . . . 17
Figure 17.SH – 4-pin SNAPHAT Housing for 120mAh Battery, Package Outline . . . . . . . . . . . . . . 18
Table 14. SH – 4-pin SNAPHAT Housing for 120 mAh Battery, Package Mechanical Data. . . . . . 18
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 15. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 16. SNAPHAT Battery Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 17. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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M48Z35AY, M48Z35AV
SUMMARY DESCRIPTION
The M48Z35AY/V ZEROPOWER
®
RAM is a 32
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 avail-
able in two special packages to provide a highly in-
tegrated battery backed-up memory solution.
The M48Z35AY/V is a non-volatile pin and func-
tion equivalent to any JEDEC standard 32K x8
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 600mil
DIP CAPHAT™ houses the M48Z35AY/V silicon
with a long life lithium button cell in a single pack-
age.
The 28-pin, 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT
®
housing con-
taining 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 sep-
arately 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 3. Logic Diagram
VCC
Table 1. Signal Names
A0-A14
DQ0-DQ7
Address Inputs
Data Inputs / Outputs
Chip Enable Input
Output Enable Input
WRITE Enable Input
Supply Voltage
Ground
15
A0-A14
8
DQ0-DQ7
E
G
W
E
G
M48Z35AY
M48Z35AV
W
V
CC
V
SS
VSS
AI02781B
4/21
M48Z35AY, M48Z35AV
Figure 4. DIP Connections
Figure 5. SOIC Connections
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
28
2
27
3
26
4
25
5
24
6
23
7 M48Z35AY 22
8 M48Z35AV 21
9
20
10
19
11
18
12
17
13
16
14
15
AI02782B
VCC
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
28
1
2
27
3
26
4
25
5
24
6
23
7 M48Z35AY 22
8 M48Z35AV 21
9
20
10
19
11
18
12
17
13
16
14
15
AI02783
VCC
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Figure 6. Block Diagram
A0-A14
LITHIUM
CELL
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
POWER
32K x 8
SRAM ARRAY
DQ0-DQ7
VPFD
E
W
G
VCC
VSS
AI01619B
5/21
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