SGS Thomson Microelectronics M68AR024D Datasheet

16 Mbit (1M x16) 1.8V Asynchronous SRAM

FEATURES SUMMARY

■ SUPPLY VOLTAGE: 1.65 to 1.95V

■ I/O SUPPLY VOLTAGE: 1.5 to 1.95V

■ 1M WORDS x 16 bits LOW POWER SRAM

■ EQUAL CYCLE and ACCESS TIME: 70ns

■ LOW V

■ LOW STANDBY CURRENT

■ TRI-STATE COMMON I/O

■ SINGLE BYTE READ/W R ITE

■ AUTOMATIC POWER DOWN

DATA RETENTION: 1.0V

CC

M68AR024D

PRELIMINARY DATA

Figure 1. Packages

BGA

TFBGA48 (ZH)

8 x 10 mm

(for Engineering

Samples only)

BGA

TFBGA48 (ZB)

6.5 x 10 mm

October 2002

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

1/19

M68AR024D

TABLE OF CONTENTS

SUMMARY DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 3. TFBGA Connections (Top view through package). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 4. Block Diagr am . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 2. Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 3. Operating and AC Measurement Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 5. AC Measurement I/O Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 6. AC Measurement Load Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Table 4. Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 5. DC Character i stics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 6. Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Read Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 7. Address Controlled, Read Mode AC Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 8. Chip Enable or Output Enable Controlled, Read Mode AC Waveforms . . . . . . . . . . . . . . 9

Figure 9. Chip Enable or UB/LB Controlled, Standby Mode AC Waveforms . . . . . . . . . . . . . . . . . . 9

Table 7. Read and Standby Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Write Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 10. Write En a ble Controlled, Writ e AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 11. Chip Enable E1 Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 12. UB/LB Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 8. Write Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figu r e 1 3 . E1 Con troll e d , L o w VCC D a ta Reten tion A C Wave fo rms . . . . . . . . . . . . . . . . . . . . . . . 1 4

Figu r e 1 4 . E2 Cont r o l led, Lo w VCC Data Re tenti o n AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . 14

Table 9. Low VCC Data Retention Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 15. TFBGA48 6.5x10mm - 6x8 ball array, 0.75 mm pitch, Bottom View Package Outline. . 15

Table 11. TFBGA48 8x10mm - 6x8 ball array, 0.75 mm pitch, Package Mechanical Data. . . . . . . 16

PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 12. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 13. Document Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

2/19

SUMMARY DESCRIPTION

The M68AR024D is a 16 Mbit (16, 777,216 bit) Low
Power SRAM fabricated in STMicroelectronics ad­vanced CMOS technology, organiz ed as 1,048,576
words by 16 bit s. The device exhi bits f ully sta tic op ­eration requiring no external clocks or timing
strobes.

It needs 1.65 to 1.95V supply voltage. By using the

pin all the outputs can be powered indepen-

V

CCQ

dently from the core supply voltage allowing to
drive the I/O pins down to 1.5V. V

pin can be

CCQ

tied to Vcc if the feature is not required.

This device has a standard Asynchronous SRAM
Interface. Read and Write cycles can be per­formed on a single byte by using UB

The device can be put into standby mode by using

/E2 pins. The same pins can be used to cas-

E1
cade more devices in order to achieve deep mem­ory expansion.

Standby mode allows a low current consu mption,
up to 99%, by reducing internal activities.

The M68AR024D is available in TFBGA48 (0.75
mm pitch) package with industrial standard foot­print.

Figure 2. Logic Diagram Table 1. Signal Names

A0-A19 Address Inputs

V

V

CC

A0-A19

W

E1

E2

UB

LB

CCQ

20

M68AR024D

G

16

DQ0-DQ15

DQ0-DQ15 Data Input/Output

, E2 Chip Enables

E1
G
W
UB
LB
V

CC

V

CCQ

V

SS

NC Not Connected Internally

Output Enable
Write Enable
Upper Byte Enable Input
Lower Byte Enable Input
Supply Voltage
I/O Supply Voltage
Ground

M68AR024D

/LB signals.

DU Don’t Use as Internally Connected

V

SS

AI05400c

3/19

M68AR024D

Figure 3. TFBGA Connections (Top view through package)

654321

A

B

C

D

E

F

G

H

LB

DQ8

DQ9

V

SS

V

CCQ

DQ14

DQ15

UB

DQ10

DQ11

DQ12

DQ13

A19

A0G

A17

NC V

A14

A9

A1

A4 E1

A6A5

A7

A16

A15

A13

A10

A2 E2

DQ3

DQ4

DQ5

DQ0A3

DQ2DQ1

V

CC

SS

DQ6

DQ7WA12

DUA11A8A18

4/19

AI05918

Figure 4. Block Diagram

A19

A8

ROW

DECODER

M68AR024D

MEMORY

ARRAY

DQ15

UB

E1
E2

UB

LB

Ex

W

G

DQ0

LBLB

MAXIMUM RATIN G

Stressing the device above the rating l isted in the
Absolute Maximum Ratings table m ay cause per­manent damage to the device. These are stress
ratings only and operation of the device at t hese or
any other conditions ab ove those i ndicated in t he
Operating sections of this specificat ion is not im-

(8)

(8)

(8)

UB

(8)

LB

I/O CIRCUITS

COLUMN

DECODER

A0 A7

AI05924

plied. Exposure to Absolute Maximum Rating con­ditions for periods greater than 1 sec 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

P

D

T

A

T

STG

V

CC

V

CCQ

(2)

V

IO

Note: 1. One output at time not to exceed 1 secon d duration.

2. Up to a m aximum operating V

Output Current 20 mA
Power Dissipation 1 W

Ambient Operating Temperature –55 to 125 °C
Storage Temperature –65 to 150 °C
Supply Voltage –0.5 to 2.5 V
I/O Supply Voltage –0.5 to 2.5 V

Input or Output Voltage

or V

CC

CCQ

–0.5 to V

of 1.95V on l y.

CCQ

+0.5

V

5/19

M68AR024D

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 M68AR02 4D

Supply Voltage

V

CC

I/O Supply Voltage (V

V

CCQ

Ambient Operating Temperature

CCQ

V

≤

)

CC

ment Conditions listed i n the relevant tables. De­signers should check that the operating conditions
in their projects match the measurement condi­tions when using the quoted parameters.

1.65 to 1.95V

1.5 to 1.95V
Range 1 0 to 70°C
Range 6 –40 to 85°C

Load Capacitance (C
Output Circuit Protection Resis tance (R
Load Resistance (R
Input Rise and Fall Times
Input Pulse Voltages
Input and Output Timing Ref. Voltages
Output Transition Timing Ref. Voltages

)

L

)

1

)

2

= 0.3V

V

RL

30pF

15.3k

11.3k
1ns/V

≤

0 to V

CCQ

V

CCQ

; VRH = 0.7V

CCQ

Ω
Ω

/2

Figure 5. AC Measurement I/O Waveform Figure 6. AC Measurement Load Circuit

V

CCQ

I/O Timing Reference Voltage

R

V

CCQ

0V

I/O Transition Timing Reference Voltage

V

CCQ

0V

V

CCQ

0.7V

0.3V

AI05987

/2

CCQ

CCQ

DEVICE
UNDER

TEST

R

2

CL includes JIG capacitance

1

OUT

C

L

CCQ

6/19

AI05988