1/20
August 2003
M68AW127B
1Mbit (128K x8), 3.0V Asynchronous SRAM
FEATURES SUMMARY
s
SUPPLY VOLTAGE: 2.7 to 3.6V
s
128K x 8 bits SRAM with OUTPUT ENABLE
s
EQUAL CYCLE and ACCESS TIMES: 70ns
s
LOW STANDBY CURRENT
s
LOW V
CC
DATA RETENTION: 1.5V
s
TRI-STATE COMMON I/O
s
LOW ACTIVE and STANDBY POWER
Figure 1. Packages
SO32 (MC)
TSOP32
8 x 20 mm
(N)
TSOP32
8 x 13.4 mm
(NK)
M68AW127B
2/20
TABLE OF CONTENTS
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 5. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. SO Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 4. TSOP Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 6. AC Measurement I/O Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 7. AC Measurement Load Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Read Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Address Controlled, Read Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 9. Chip Enable or Output Enable Controlled, Read Mode AC Waveforms. . . . . . . . . . . . . . . 9
Table 7. Read and Standby Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Write Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 11. Write Enable Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Chip Enable Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Write Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 13. E1 Controlled, Low V
CC
Data Retention AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 14. E2 Controlled, Low V
CC
Data Retention AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 9. Low VCC Data Retention Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SO32 - 32 lead Plastic Small Outline, Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SO32 - 32 lead Plastic Small Outline, Package Mechanical Data. . . . . . . . . . . . . . . . . . . . . . . . . . 15
TSOP32 - 32 lead Plastic Small Outline 8x20mm, Package Outline. . . . . . . . . . . . . . . . . . . . . . . . 16
TSOP32 - 32 lead Plastic Small Outline 8x20mm, Package Mechanical Data . . . . . . . . . . . . . . . . 16
TSOP32 - 32 lead Plastic Small Outline 8x13.4mm, Package Outline . . . . . . . . . . . . . . . . . . . . . . 17
TSOP32 - 32 lead Plastic Small Outline 8x13.4mm, Package Mechanical Data . . . . . . . . . . . . . . 17
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 13. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 14. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3/20
M68AW127B
SUMMARY DESCRIPTION
The M68AW127B is a 1Mbit (1,048,576 bit) CMOS
SRAM, organized as 131,072 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
2.7 to 3.6V supply.
This device has an automatic power-down feature,
reducing the power consumption by over 99%
when deselected.
The M68AW127B is available in SO32, TSOP32
8x20mm and TSOP32 8x13.4mm packages.
Figure 2. Logic Diagram
Table 1. Signal Names
AI05972b
17
A0-A16
W
DQ0-DQ7
VCC
M68AW127B
G
VSS
8
E1
E2
A0-A16
Address Inputs
DQ0-DQ7
Data Input/Output
E1
Chip Enable
E2
Chip Enable
G
Output Enable
W
Write Enable
V
CC
Supply Voltage
V
SS
Ground
5/20
M68AW127B
Figure 5. 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. One output at a time, not to exceed 1 second duration.
2. Up to a maximum operating V
CC
of 3.6V only.
AI05471
ROW
DECODER
A7
A16
DQ0
DQ7
COLUMN
DECODER
I/O CIRCUITS
A0
A6
W
G
MEMORY
ARRAY
E1
E2
Ex
Symbol
Parameter
Value
Unit
I
O
(1)
Output Current
20
mA
T
A
Ambient Operating Temperature
55 to 125
C
T
STG
Storage Temperature
65 to 150
C
V
CC
Supply Voltage
0.3 to 4.6
V
V
IO
(2)
Input or Output Voltage
0.5 to V
CC
+0.5
V
P
D
Power Dissipation
1
W
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