M48T12 查看數據表（PDF） - STMicroelectronics

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M48T12

5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T02, M48T12

READ Mode

The M48T02/12 is in the READ Mode whenever W

(WRITE Enable) is high and E (Chip Enable) is

low. The device architecture allows ripple-through

access of data from eight of 16,384 locations in the

static storage array. Thus, the unique address

specified by the 11 Address Inputs defines which

one of the 2,048 bytes of data is to be accessed.

Valid data will be available at the Data I/O pins

within Address Access time (tAVQV) after the last

address input signal is stable, providing that the E

and G access times are also satisfied. If the E and

G access times are not met, valid data will be

available after the latter of the Chip Enable Access

time (tELQV) or Output Enable Access time

(tGLQV).

The state of the eight three-state Data I/O signals

is controlled by E and G. If the outputs are activat-

ed before tAVQV, the data lines will be driven to an

indeterminate state until tAVQV. If the Address In-

puts are changed while E and G remain active,

output data will remain valid for Output Data Hold

time (tAXQX) but will go indeterminate until the next

Address Access.

Figure 6. READ Mode AC Waveforms

A0-A10

tAVAV

VALID

tAVQV

tELQV

E

tELQX

tGLQV

G

DQ0-DQ7

tGLQX

tAXQX

tEHQZ

tGHQZ

VALID

Note: WRITE Enable (W) = High.

AI01330

Table 7. READ Mode AC Characteristics

M48T02/M48T12

Symbol

Parameter(1)

–70

–150

–200

Min Max Min Max Min Max

tAVAV

READ Cycle Time

70

150

200

tAVQV

Address Valid to Output Valid

70

150

200

tELQV

Chip Enable Low to Output Valid

70

150

200

tGLQV

Output Enable Low to Output Valid

35

75

80

tELQX

Chip Enable Low to Output Transition

5

10

10

tGLQX

Output Enable Low to Output Transition

5

5

5

tEHQZ

Chip Enable High to Output Hi-Z

25

35

40

tGHQZ

Output Enable High to Output Hi-Z

25

35

40

tAXQX

Address Transition to Output Transition

10

5

5

Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted).

Unit

ns

ns

ns

ns

ns

ns

ns

ns

ns

7/19

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