M28F420 datasheet(6/38 Pages) STMICROELECTRONICS

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SRAM Interface Levels

EPROM Interface Levels

Input Rise and Fall Times

≤ 10ns

Input Pulse Voltages

0 to 3V

0.45V to 2.4V

Input and Output Timing Ref. Voltages

1.5V

0.8V and 2V

Table 8. AC Measurement Conditions

AI01275

SRAM Interface

1.5V

2.4V

EPROM Interface

0.45V

2.0V

0.8V

Figure 3. AC Testing Input Output Waveform

AI01276

1.3V

OUT

CL = 30pF or 100pF

CL = 30pF for SRAM Interface

CL = 100pF for EPROM Interface

CL includes JIG capacitance

3.3k

1N914

DEVICE

UNDER

TEST

Figure 4. AC Testing Load Circuit

Symbol

Parameter

Test Condition

Min

Max

Unit

CIN

Input Capacitance

VIN =0V

COUT

Output Capacitance

VOUT =0V

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

Table 9. Capacitance (1) (TA =25

°C, f = 1 MHz )

DEVICE OPERATION

Signal Descriptions

A0-A17 Address Inputs. The address signals,

inputs for the memory array, are latched during a

write operation.

A9 Address Input is also used for the Electronic

Signature Operation. When A9 is raised to 12V the

Electronic Signature may be read. The A0 signal is

used to read two words or bytes, when A0 is Low

the Manufacturer code is read and when A0 is High

the Device code. When BYTE is Low DQ0-DQ7

output the codes and DQ8-DQ15 are don’t care,

when BYTE is High DQ0-DQ7 output the codes

and DQ8-DQ15 output 00h.

DQ0-DQ7 Data Input/Outputs. The data inputs, a

byte or the lower byte of a word to be programmed

or a command to the C.I., are latched when both

Chip Enable E and Write Enable W are active. The

data output from the memory Array, the Electronic

Signature or Status Register is valid when Chip

Enable E and Output Enable G are active. The

output is high impedance when the chip is dese-

lected or the outputs are disabled.

DQ8-DQ14 and DQ15A-1 Data Input/Outputs.

These input/outputs are used in the word-wide

organization. When BYTE is High for the most

significant byte of the input or output, functioning

as described for DQ0-DQ7 above. When BYTE is

Low, DQ8-DQ14 are high impedance, DQ15A-1 is

the Address A-1 input.

6/38

M28F410, M28F420

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