M27C4002-12F1X datasheet(4/18 Pages) STMICROELECTRONICS

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M27C4002

4/18

Standby Mode

The M27C4002 has a standby mode which reduc-

es the supply current from 50mA to 100µA. The

M27C4002 is placed in the standby mode by ap-

plyingaCMOS highsignal tothe E input. When in

the standby mode, the outputs are in a high imped-

ance state, independent of the G input.

Two Line Output Control

Because EPROMs are usually used in larger

memory arrays, the product features a 2 line con-

trol function which accommodates the use of mul-

tiple memory connection. The two line control

function allows:

a. the lowest possible memory power dissipation,

b. complete assurance that output bus contention

will not occur.

For the most efficient use of these two control

lines, E should be decoded and used as the prima-

ry device selecting function, while G should be

made a common connection to all devices in the

array and connected to the READ line from the

system control bus. This ensures that all deselect-

ed memory devices are in their low power standby

mode and that the output pins are only active

when data is required from a particular memory

device.

Table 5. AC Measurement Conditions

High Speed

Standard

Input Rise and Fall Times

≤ 10ns

≤ 20ns

Input Pulse Voltages

0 to 3V

0.4V to 2.4V

Input and Output Timing Ref. Voltages

1.5V

0.8V and 2V

Figure 3A. AC Testing Input Output Waveform

AI01822

High Speed

1.5V

2.4V

Standard

0.4V

2.0V

0.8V

Figure 4. AC Testing Load Circuit

AI01823B

1.3V

OUT

CL = 30pF for High Speed

CL = 100pF for Standard

CL includes JIG capacitance

3.3k

Ω

1N914

DEVICE

UNDER

TEST

Table 6. Capacitance (1) (TA = 25 °C,f= 1 MHz)

Note: 1. Sampled only, not 100% tested.

Symbol

Parameter

Test Condition

Min

Max

Unit

CIN

Input Capacitance

VIN =0V

6pF

COUT

Output Capacitance

VOUT =0V

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