1/20
May 2002
M48Z35
M48Z35Y
256 Kbit (32 Kbit x 8) ZEROPOWER
SRAM
FEATURES SUMMARY
s
INTEGRATED, ULTRA LOW POWER SRAM,
POWER-FAIL CONTROL CIRCUIT, and
BATTERY
s
READ CYCLE TIME EQUALS WRITE CYCLE
TIME
s
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
s
WRITE PROTECT VOLTAGES:
(V
PFD
= Power-fail Deselect Voltage)
M48Z35: V
CC
= 4.75 to 5.5V
4.5V
V
PFD
4.75V
M48Z35Y: 4.5 to 5.5V
4.2V
V
PFD
4.5V
s
SELF-CONTAINED BATTERY IN THE
CAPHATTM DIP PACKAGE
s
PACKAGING INCLUDES A 28-LEAD SOIC and
SNAPHAT
TOP (to be Ordered Separately)
s
PIN and FUNCTION COMPATIBLE WITH
JEDEC STANDARD 32K x 8 SRAMs
s
SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP WHICH
CONTAINS THE BATTERY and CRYSTAL
Figure 1. 28-pin CAPHATTM DIP Package
Figure 2. 28-pin SOIC Package
PCDIP28 (PC)
Battery CAPHAT
28
1
SNAPHAT (SH)
Crystal / Battery
SOH28 (MH)
28
1
M48Z35, M48Z35Y
2/20
TABLE OF CONTENTS
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Logic Diagram (Figure 3.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Signal Names (Table 1.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
DIP Connections (Figure 4.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SOIC Connections (Figure 5.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block Diagram (Figure 6.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute Maximum Ratings (Table 2.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating and AC Measurement Conditions (Table 3.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
AC Measurement Load Circuit (Figure 7.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Capacitance (Table 4.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DC Characteristics (Table 5.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Operating Modes (Table 6.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
READ Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
READ Mode AC Waveforms (Figure 8.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
READ Mode AC Characteristics (Table 7.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
WRITE Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
WRITE Enable Controlled, WRITE AC Waveforms (Figure 9.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chip Enable Controlled, WRITE AC Waveforms (Figure 10.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
WRITE Mode AC Characteristics (Table 8.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Data Retention Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Down/Up Mode AC Waveforms (Figure 11.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Down/Up AC Characteristics (Table 9.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Power Down/Up Trip Points DC Characteristics (Table 10.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
V
CC
Noise And Negative Going Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Supply Voltage Protection (Figure 12.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SNAPHAT Battery Table (Table 12.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5/20
M48Z35, M48Z35Y
MAXIMUM RATING
Stressing the device above the rating listed in the
"Absolute Maximum Ratings" table may cause
permanent damage to the device. These are
stress ratings only and operation of the device at
these or any other conditions above those indicat-
ed in the Operating sections of this specification is
not implied. Exposure to Absolute Maximum Rat-
ing conditions for extended periods may affect de-
vice
reliability.
Refer
also
to
the
STMicroelectronics SURE Program and other rel-
evant quality documents.
Table 2. Absolute Maximum Ratings
Note: 1. For DIP package: Soldering temperature not to exceed 260C for 10 seconds (total thermal budget not to exceed 150C for longer
than 30 seconds).
2. For SO package: Reflow at peak temperature of 215C to 225C for < 60 seconds (total thermal budget not to exceed 180C for
between 90 to 120 seconds).
CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode.
Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
Symbol
Parameter
Value
Unit
T
A
Ambient Operating Temperature
Grade 1
0 to 70
C
Grade 6
40 to 85
C
T
STG
Storage Temperature (V
CC
Off, Oscillator Off)
SNAPHAT
40 to 85
C
SOIC
55 to 125
C
T
SLD
(1,2)
Lead Solder Temperature for 10 seconds
260
C
V
IO
Input or Output Voltages
0.3 to 7.0
V
V
CC
Supply Voltage
0.3 to 7.0
V
I
O
Output Current
20
mA
P
D
Power Dissipation
1
W