1/15
May 2002
M68Z512W
4 Mbit (512 Kbit x 8) LOW VOLTAGE,
LOW POWER SRAM WITH OUTPUT ENABLE
FEATURES SUMMARY
s
ULTRA LOW DATA RETENTION CURRENT
400nA (typical)
10µA (max)
s
OPERATION VOLTAGE: 2.7 TO 3.6V
s
512 Kbit x 8 SRAM WITH OUTPUT ENABLE
s
EQUAL CYCLE and ACCESS TIMES: 70ns
s
LOW V
CC
DATA RETENTION: 1V
s
TRI-STATE COMMON I/O
s
CMOS FOR OPTIMUM SPEED/POWER
s
AUTOMATIC POWER-DOWN WHEN
DESELECTED
s
INTENDED FOR USE WITH ST
ZEROPOWER
®
AND TIMEKEEPER
®
SUPERVISORS
Figure 1. 32-pin TSOP Package
TSOP II 32 (NC)
10 x 20mm
32
1
M68Z512W
2/15
TABLE OF CONTENTS
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Logic Diagram (Figure 2.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Signal Names (Table 1.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TSOP Connections (Figure 3.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block Diagram (Figure 4.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Absolute Maximum Ratings (Table 2.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DC and AC Measurement Conditions (Table 3.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
AC Testing Load Circuit (Figure 5.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Capacitance (Table 4.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DC Characteristics (Table 5.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating Modes (Table 6.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
READ Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Address Controlled, READ Mode AC Waveforms (Figure 6.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Chip Enable or Output Enable Controlled, READ Mode AC Waveforms (Figure 7.). . . . . . . . . . . . . 7
READ Mode AC Characteristics (Table 7.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
WRITE Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Write Enable Controlled, WRITE Mode AC Waveforms (Figure 9.) . . . . . . . . . . . . . . . . . . . . . . . . . 9
Chip Enable Controlled, WRITE Mode AC Waveforms (Figure 10.) . . . . . . . . . . . . . . . . . . . . . . . . . 9
WRITE Mode AC Characteristics (Table 8.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Low VCC Data Retention AC Waveforms (Figure 11.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Low VCC Data Retention Characteristics (Table 9.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3/15
M68Z512W
DESCRIPTION
The M68Z512W is a 4Mbit (4,194,304 bit) CMOS
SRAM, organized as 524,288 words by 8 bits. The
device features fully static operation requiring no
external clocks or timing strobes, with equal ad-
dress access and cycle times. It requires a single
3V ±10% supply, and all inputs and outputs are
TTL compatible.
This device has an automatic power-down feature,
reducing the power consumption by over 99%
when deselected.
The M68Z512W is available in a 32-lead TSOP II
(10 x 20mm) package.
Figure 2. Logic Diagram
Table 1. Signal Names
Figure 3. TSOP Connections
AI03072
19
A0-A18
W
DQ0-DQ7
VCC
M68Z512W
G
VSS
8
E
A0-A18
Address Inputs
DQ0-DQ7
Data Input/Output
E
Chip Enable
G
Output Enable
W
Write Enable
V
CC
Supply Voltage
V
SS
Ground
DQ5
DQ6
DQ7
DQ0
VSS
DQ3
DQ4
DQ1
DQ2
A12
A15
A14
A16
A6
A17
G
W
A8
A10
A11
A9
A13
A5
A7
A2
A0
A3
A4
A1
AI03073
M68Z512W
8
1
9
16
17
24
25
32
VCC
A18
E
M68Z512W
4/15
Figure 4. Block Diagram
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. Reflow at peak temperature of 215°C to 225°C for < 60 seconds (total thermal budget not to exceed 180°C for between 90 and 120
seconds).
2. Up to a maximum operating V
CC
of 3.6V only.
3. One output at a time, not to exceed 1 second duration.
AI03033
ROW
DECODER
A
A
(10)
CHIP ENABLE.
INPUT
DATA
CTRL
DQ
DQ
(8)
COLUMN
DECODER
I/O CIRCUITS
(9)
A
A
CHIP ENABLE.
W
G
MEMORY
ARRAY
VCC
VSS
E
Symbol
Parameter
Value
Unit
T
A
Ambient Operating Temperature
0 to 70
°C
T
STG
(1)
Storage Temperature
65 to 150
°C
V
IO
(2)
Input or Output Voltage
0.3 to V
CC
+ 0.3
V
V
CC
Supply Voltage
0.3 to 4.6
V
I
O
(3)
Output Current
20
mA
P
D
Power Dissipation
1
W
5/15
M68Z512W
DC AND AC PARAMETERS
This section summarizes the operating and mea-
surement conditions, as well as the DC and AC
characteristics of the device. The parameters in
the following DC and AC Characteristic tables are
derived from tests performed under the Measure-
ment Conditions listed in the relevant tables. De-
signers should check that the operating conditions
in their projects match the measurement condi-
tions when using the quoted parameters.
Table 3. DC and AC Measurement Conditions
Figure 5. AC Testing Load Circuit
Table 4. Capacitance
Note: 1. Effective capacitance measured with power supply at 3V; sampled only, not 100% tested.
2. At 25°C, f = 1MHz.
3. Outputs deselected.
Parameter
M68Z512W
V
CC
Supply Voltage
2.7 to 3.6V
Ambient Operating Temperature
0 to 70°C
Load Capacitance (C
L
)
30pF
Input Rise and Fall Times
5ns
Input Pulse Voltages
0 to 3V
Input and Output Timing Ref. Voltages
1.5V
AI03074
3.0V
OUT
CL = 30pF or 5pF
CL includes JIG capacitance
1105
DEVICE
UNDER
TEST
1550
Symbol
Parameter
(1,2)
Min
Max
Unit
C
IN
Input Capacitance on all pins (except DQ)
6
pF
C
OUT
(3)
Output Capacitance
8
pF
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