M27W400 datasheet(2/15 Pages) STMICROELECTRONICS

2 / 15 page

M27W400

2/15

Figure 2A. DIP Connections

Q11

VSS

A14

Q15A–1

A15

A16

Q14

A13

BYTEVPP

VSS

Q12

Q10

VCC

A10

A17

AI03097

M27W400

Q13

A12

A11

Table 1. Signal Names

A0-A17

Address Inputs

Q0-Q7

Data Outputs

Q8-Q14

Data Outputs

Q15A–1

Data Output / Address Input

Chip Enable

Output Enable

BYTEVPP

Byte Mode / Program Supply

VCC

Supply Voltage

VSS

Ground

Figure 2B. LCC Connections

AI03604

A14

VSS

A16

BYTEVPP

A13

M27W400

A12

VSS

Q14

A15

Q15A–1

DEVICE OPERATION

The operating modes of the M27W400 are listed in

the Operating Modes Table. A single power supply

is required in the read mode. All inputs are TTL

compatible except for VPP and 12V on A9 for the

Electronic Signature.

Read Mode

The M27W400 has two organisations, Word-wide

and Byte-wide. The organisation is selected by the

signal level on the BYTEVPP pin. When BYTEVPP

is at VIH the Word-wide organisation is selected

and the Q15A–1 pin is used for Q15 Data Output.

When the BYTEVPP pin is at VIL the Byte-wide or-

ganisation is selected and the Q15A–1 pin is used

for the Address Input A–1. When the memory is

logically regarded as 16 bit wide, but read in the

Byte-wide organisation, then with A–1 at VIL the

lower 8 bits of the 16 bit data are selected and with

A–1 at VIH the upper 8 bits of the 16 bit data are

selected.

M27W400 Arkusz danych(PDF) 2 Page - STMicroelectronics

M27W400 Arkusz danych(HTML) 2 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Arkusz danych Pobierz

Link URL