M68AF031AL55B1T datasheet, PDF

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M68AF031AL55B1T: Description32K X 8 STANDARD SRAM, 70 ns, PDSO28; Categorystorage; File Size143KB，22 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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M68AF031AL55B1T Overview

32K X 8 STANDARD SRAM, 70 ns, PDSO28

M68AF031AL55B1T Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 Cel
Minimum operating temperature	-40 Cel
Maximum supply/operating voltage	5.5 V
Minimum supply/operating voltage	4.5 V
Rated supply voltage	5 V
maximum access time	70 ns
Processing package description	0.300 INCH, Plastic, SO-28
Lead-free	Yes
EU RoHS regulations	Yes
state	DISCONTINUED
Craftsmanship	CMOS
packaging shape	Rectangle
Package Size	SMALL OUTLINE
surface mount	Yes
Terminal form	GULL WING
Terminal spacing	1.27 mm
terminal coating	MATTE Tin
Terminal location	pair
Packaging Materials	Plastic/Epoxy
Temperature level	INDUSTRIAL
memory width	8
organize	32K × 8
storage density	262144 deg
operating mode	ASYNCHRONOUS
Number of digits	32768 words
Number of digits	32K
Memory IC type	Standard memory
serial parallel	parallel

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M68AF031A

256 Kbit (32K x 8) 5.0V Asynchronous SRAM

FEATURES SUMMARY

■

SUPPLY VOLTAGE: 4.5 to 5.5V

32K x 8 bits SRAM with OUTPUT ENABLE

EQUAL CYCLE and ACCESS TIME: 55, 70ns

LOW STANDBY CURRENT

LOW V

DATA RETENTION: 2V

TRI-STATE COMMON I/O

AUTOMATIC POWER DOWN

PACKAGES

– SO28, PDIP28, TSOP28 Standard and

Reverse Pinout.

– TSOP28 Standard Available in Lead-Free

Version

Figure 1. Packages

SO28 (MS)

PDIP28 (B)

TSOP28 (N)

8 x 13.4mm

TSOP28 (NS)

8 x 13.4 mm (Reverse)

November 2004

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M68AF031A

TABLE OF CONTENTS

FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 2.

Table 1.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SO Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

DIP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

TSOP Connections (Normal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

TSOP Connections (Reverse) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3.

Figure 8.

Figure 9.

Table 4.

Table 5.

Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

AC Measurement I/O Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

AC Measurement Load Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

DC Characteristics (M68AF031A-55 and M68AF031A-70) . . . . . . . . . . . . . . . . . . . . . . . . 9

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 6. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Read Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 10.Address Controlled, Read Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 11.Chip Enable or Output Enable Controlled, Read Mode AC Waveforms. . . . . . . . . . . . . 11

Figure 12.Chip Enable Controlled, Standby Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 7. Read and Standby Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Write Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 13.Write Enable Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 14.Chip Enable Controlled, Write AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 8. Write Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 15.Low V

Data Retention AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 9. Low V

Data Retention Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 16.SO28 - 28 lead Plastic Small Outline, 300 mils body width, Package Outline . . . . . . . . 16

Table 10. SO28 - 28 lead Plastic Small Outline, 300 mils body width, Package Mechanical Data . 16

Figure 17.PDIP28 - 28 pin Plastic DIP, 600 mils width, Package Outline . . . . . . . . . . . . . . . . . . . . 17

Table 11. PDIP28 - 28 pin Plastic DIP, n600 mils width, Package Mechanical Data . . . . . . . . . . . 17

Figure 18.TSOP28 - 28 lead Normal Pinout Plastic Small Outline, Package Outline . . . . . . . . . . . 18

Table 12. TSOP28 - 28 lead Normal Pinout Plastic Small Outline, Package Mechanical Data . . . 18

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