ST M68AW127B User Manual

M68AW127

M68AW127B

1Mbit (128K x8), 3.0V Asynchronous SRAM

FEATURES SUMMARY
■ SUPPLY VOLTAGE: 2.7 to 3.6V	Figure 1. Packages
■ 128K x 8 bits SRAM with OUTPUT ENABLE
■ EQUAL CYCLE and ACCESS TIMES: 70ns
■ LOW STANDBY CURRENT
■ LOW VCC DATA RETENTION: 1.5V
■ TRI-STATE COMMON I/O
■ LOW ACTIVE and STANDBY POWER	SO32 (MC)

TSOP32 8 x 20 mm

(N)

TSOP32 8 x 13.4 mm

(NK)

August 2003

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M68AW127B

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 VCC Data Retention AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 14. E2 Controlled, Low VCC 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

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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 address 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

	VCC
17	8
A0-A16	DQ0-DQ7

W

E1 M68AW127B

E2

G

VSS

AI05972b

Table 1. Signal Names

	A0-A16				Address Inputs
	DQ0-DQ7				Data Input/Output
					Chip Enable
	E1
	E2				Chip Enable
					Output Enable
	G
					Write Enable
	W
	VCC				Supply Voltage
	VSS				Ground

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M68AW127B

Figure 3. SO Connections

					VCC
NC	1		32
A16					A15
A14					E2
A12
					W
A7					A13
A6					A8
A5					A9
A4	8	M68AW127B	25		A11
	9		24
A3					G
A2					A10
A1
					E1
A0					DQ7
DQ0					DQ6
DQ1					DQ5
DQ2					DQ4
VSS	16		17		DQ3
		AI05931b

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Figure 4. TSOP Connections

A11			1				32		G
A9									A10
A8
									E1
A13									DQ7
									DQ6
	W
E2									DQ5
A15									DQ4
VCC			8	M68AW127B			25		DQ3
NC			9				24		VSS
A16									DQ2
A14									DQ1
A12									DQ0
A7									A0
A6									A1
A5									A2
A4			16				17	A3
						AI05973c

M68AW127B

Figure 5. Block Diagram

	A16
	ROW	MEMORY
	DECODER		ARRAY
	A7
	DQ7	I/O CIRCUITS
		COLUMN
		DECODER
	DQ0
E1	Ex
E2
		A0	A6
W
G
			AI05471

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 indicated in the Operating sections of this specification is

Table 2. Absolute Maximum Ratings

not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.

Symbol		Parameter	Value	Unit
IO (1)		Output Current	20	mA
	TA	Ambient Operating Temperature	–55 to 125	°C
TSTG		Storage Temperature	–65 to 150	°C
VCC		Supply Voltage	–0.3 to 4.6	V
V	(2)	Input or Output Voltage	–0.5 to VCC +0.5	V
	IO
	PD	Power Dissipation	1	W

Note: 1. One output at a time, not to exceed 1 second duration. 2. Up to a maximum operating VCC of 3.6V only.

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M68AW127B

DC AND AC PARAMETERS

This section summarizes the operating 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 Measure-

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

Table 3. Operating and AC Measurement Conditions

	Parameter		M68AW127B
	VCC Supply Voltage		2.7 to 3.6V
	Ambient Operating Temperature	Range 1	0 to 70°C
		Range 6	–40 to 85°C
	Load Capacitance (CL)		100pF
	Output Circuit Protection Resistance (R1)		3.0kΩ
	Load Resistance (R2)		3.1kΩ
	Input Rise and Fall Times		1ns/V
	Input Pulse Voltages		0 to VCC
	Input and Output Timing Ref. Voltages		VCC/2
	Output Transition Timing Ref. Voltages		VRL = 0.3VCC; VRH = 0.7VCC

Figure 6. AC Measurement I/O Waveform

Figure 7. AC Measurement Load Circuit

VCC

I/O Timing Reference Voltage

VCC

R1

VCC/2

DEVICE

0V

UNDER

OUT

TEST

Output Transition Timing Reference Voltage

CL

R2

VCC

0.7VCC

0V

0.3VCC

AI04831

CL includes JIG capacitance

AI05814

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