M27V160 datasheet(2/15 Pages) STMICROELECTRONICS

2 / 15 page

M27V160

2/15

Figure 2B. SO Connections

VSS

A13

VSS

A14

A15

A12

A16

BYTEVPP

Q15A-1

VCC

Q11

Q14

A19

A18

AI01900

M27V160

Q13

A11

A10

Q10

Q12

A17

Figure 2A. DIP Connections

VSS

A13

VSS

A14

A15

A12

A16

BYTEVPP

Q15A-1

VCC

Q11

Q14

A17

A18

A19

AI01899

M27V160

Q13

A11

A10

Q10

Q12

Table 1. Signal Names

A0-A19

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

Not Connected Internally

DEVICE OPERATION

The operating modes of the M27V160 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 M27V160 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.

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