SGS Thomson Microelectronics M68AF127B Datasheet

1Mbit (128K x8), 5V Asynchronous SRAM

FEATURES SUMMARY

SUPPLY VOLTAGE : 4.5 to 5.5V
128K x 8 bits SRAM with OUTPUT ENABLE
EQUAL CYCLE and ACCESS TIMES: 55ns
LOW STANDBY CURRENT
TRI-STATE COMMON I/O
LOW ACTIVE and STAN DBY POWER
DATA RETENTION: 2V
CC
M68AF127B

Figure 1. Packages

SO32 (MC)
32
1
PDIP32 (B)
TSOP32 (NK)
8 x 13.4 mm
TSOP32 (N)
8 x 20 mm
1/21August 2003
M68AF127B

TABLE OF CONTENTS

SUMMARY DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 6. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. SO Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 4. DIP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 5. TSOP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 6. 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 7. AC Measurement I/O Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 8. 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 9. Address Controlled, Read Mode AC Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 10. Chip Enable or Output Enable Controlled, Read Mode AC Waveforms. . . . . . . . . . . . . . 9
Table 7. Read and Standby Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Write Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Write Enable Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 13. Chip Enable Controlled, Write AC Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Write Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 14. E1 Controlled, Low V Figure 15. E2 Controlled, Low V
Data R e t e n tion A C Wavefo r ms . . . . . . . . . . . . . . . . . . . . . . . . 14
CC
Data R e t e n tion A C W avefo rms . . . . . . . . . . . . . . . . . . . . . . . . 14
CC
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
PDIP32 - 32 pin Plastic DIP, 600 mils width, Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
PDIP32 - 32 pin Plastic DIP, 600 mils width, Package Mechanical Data . . . . . . . . . . . . . . . . . . . . 16
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 14. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 15. Document Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
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SUMMARY DESCRIPTION

The M68AF127B is a 1Mbit (1,048,576 bit) CMOS SRAM, organized as 131,072 words by 8 bits. The device features fully static operat ion requiring no external clocks or timing strobes, with equal ad­dress access and cycle times. It requires a single
4.5 to 5.5V supply.
This device has an automatic power-down feature, reducing the power consumption by over 99% when deselected.
The M68AF127B is available in SO32, PDIP32, TSOP32 (8x13.4mm) and TSOP32 (8x20mm) packages.

Figure 2. Logic Diagram Table 1. Signal Names

A0-A16 Address Inputs
M68AF127B
A0-A16
W
E1
E2
V
CC
17
M68AF127B
G
V
SS
8
DQ0-DQ7
AI05472B
DQ0-DQ7 Data Input/Output E1 E2 Chip Enable G W V
CC
V
SS
Chip Enable
Output Enable Write Enable Supply Voltage Ground
3/21
M68AF127B

Figure 3. SO Connections

NC A16 A14 A12
A7 A6 A5 A4 A3 A2 A1
A0 DQ0 DQ1 DQ2 V
SS
1
8
M68AF127B
9
16 17
32
25 24
AI07270B
V
CC
A15 E2 W A13 A8 A9 A11 G A10 E1 DQ7 DQ6 DQ5 DQ4 DQ3

Figure 5. TSOP Connections

A11
A9 A8
A13
E2
A15
V
CC
NC A16 A14 A12
A7 A6 A5 A4 A3
1
W
8
M68AF127B
9
16 17
32
25 24
AI05473d
G A10 E1 DQ7 DQ6 DQ5 DQ4 DQ3 V
SS
DQ2 DQ1 DQ0 A0 A1 A2

Figure 4. DIP C on ne ctions

1
NC
2
A16
3
A14
4
A12
5
A7
6
A6
7
A5
8
A4 A3 A2 A1
A0 DQ0 DQ1 DQ2 V
SS
M68AF127B
9 10 11 12 13 14 15 16
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
AI07203B
V
CC
A15 E2 W A13 A8 A9 A11 G A10 E1 DQ7 DQ6 DQ5 DQ4 DQ3
4/21

Figure 6. Block Diagram

A16
A7
ROW
DECODER
M68AF127B
MEMORY
ARRAY
DQ7
DQ0
E1 E2
W
G
Ex

MAXIMUM RATIN G

Stressing the device ab ove 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 dev ice at these or any other conditions above those indicat­ed in the Operating sections of this specification is
I/O CIRCUITS
COLUMN
DECODER
A0 A6
AI05471
not implied. Exposure to Absol ute Maxim um Ra t­ing conditions for extended periods may affect de­vice reliability. Refer also to the STMicroelectronics SURE Program and other rel­evant quality documents.

Table 2. Absolute Maximum Ratings

Symbol Parameter Value Unit
(1)
I
O
T
A
T
STG
V
CC
(2)
V
IO
P
D
Note: 1. One output at a time, not to exceed 1 second duration.
2. Up to a maximum operating V
Output Current 20 mA Ambient Operating Temperature –55 to 125 °C
Storage Temperature –65 to 150 °C Supply Voltage –0.5 to 6.5 V
Input or Output Voltage
–0.5 to V
CC
+0.5
Power Dissipation 1 W
of 6.0V only.
CC
V
5/21
M68AF127B

DC AND AC PARAMETERS

This section summarizes the operat ing and mea­surement 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 M easure-

Table 3. Operating and AC Measurement Conditions

Parameter M68AF127B
V
Supply Voltage
CC
Ambient Operating Temperature
ment Conditions listed in the rel evant tables. De­signers should check that the operating conditions in their projects match the measurement condi­tions when using the quoted parameters.
4.5 to 5.5V Range 1 0 to 70°C Range 6 –40 to 85°C
Load Capacitance (C Output Circuit Protection Resis tance (R Load Resistance (R
)
L
)
1
)
2
100pF
3.0k
3.1k Input Rise and Fall Times 1ns/V Input Pulse Voltages Input and Output Timing Ref. Voltages Output Transition Timing Ref. Voltages
V
RL
0 to V
CC
V
/2
CC
= 0.3VCC; VRH = 0.7V

Figure 7. AC Measurement I/O Waveform Figure 8. AC Measurement Load Circuit

V
CC
I/O Timing Reference Voltage
V
CC
0V
Output Transition Timing Reference Voltage
V
CC
0V
VCC/2
0.7V
0.3V
AI04831
DEVICE UNDER
TEST
R
CC
CC
CL includes JIG capacitance
R
1
OUT
C
L
2
CC
6/21
AI05814
M68AF127B

Table 4. Capacitance

Symbol
C
C
OUT
Note: 1. Sampled only, not 100% tested.
2. At T
Input Capacitance on all pins (except DQ)
IN
Output Capacitance
= 25°C, f = 1MHz, VCC = 3.0V.
A
Parameter
(1,2)

Table 5. DC Characteristics

Symbol Parameter Test Condition Min Typ Max Unit
V
I
CC1
I
CC2
I
I
LO
I
(1,2)
Supply Current
(3)
Operating Supply Current
Input Leakage Current
LI
(4)
Output Leakage Current
Standby Supply Current CMOS
SB
= 5.5V, f = 1/t
CC
I
OUT
V
CC
0V ≤ V
0V
V
= 5.5V, E1 V
CC
E2 0.2V, f=0
= 0mA
= 5.5V, f = 1MHz,
I
= 0mA
OUT
IN
V
OUT
AVAV
V
≤ V
CC
CC
CC
,
– 0.2V,
Test
Condition
V
= 0V
IN
V
= 0V
OUT
Min Max Unit
6pF 8pF
55 7.5 20 mA 70 6.0 15 mA
2mA
–1 1 µA –1 1 µA
2.5 15 µA
V
V V V
Note: 1. Average AC current , c ycling at t
Input High Voltage 2.2
IH
Input Low Voltage –0.3 0.8 V
IL
Output High Voltage
OH
Output Low Voltage
OL
= VIL, E2 = VIH, VIN = VIH or VIL.
2. E1
0.2V or E2 ≥ VCC –0.2V, VIN 0.2V or VIN VCC –0.2V.
3. E1
4. Outpu t disabled.
AVAV
minimum.
I
= –1mA
OH
I
= 2.1mA
OL
V
+ 0.3
CC
2.4 V
0.4 V
V
7/21
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