M27C160_06 Datasheet, PDF (8/26 Pages) STMicroelectronics – 16 Mbit (2 Mb x 8 or 1 Mb x 16) UV EPROM and OTP EPROM

Device description
2
Device description
M27C160
Note:
2.1
2.2
Table 2 lists the operating modes of the M27C160. A single power supply is required in the
read mode. All inputs are TTL compatible except for V_PP and 12V on A9 for the Electronic
Signature.
Table 2. Operating Modes
Mode
E
Read Word-wide
Read Byte-wide Upper
Read Byte-wide Lower
Output Disable
Program
Verify
Program Inhibit
Standby
Electronic Signature
V_IL
V_IL
V_IL
V_IL
V_IL Pulse
V_IH
V_IH
V_IH
V_IL
X = V_IH or V_IL, V_ID = 12V ± 0.5V.
G BYTEV_PP A9
V_IL
V_IH
X
V_IL
V_IL
X
V_IL
V_IL
X
V_IH
X
X
V_IH
V_PP
X
V_IL
V_PP
X
V_IH
V_PP
X
X
X
X
V_IL
V_IH
V_ID
Q15A–1 Q8-Q14 Q7-Q0
Data Out Data Out Data Out
V_IH
Hi-Z Data Out
V_IL
Hi-Z Data Out
Hi-Z
Hi-Z
Hi-Z
Data In Data In Data In
Data Out Data Out Data Out
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Code Codes Codes
Read mode
The M27C160 has two organisations, Word-wide and Byte-wide. The organisation is
selected by the signal level on the BYTEV_PP pin. When BYTEV_PP is at V_IH the Word-wide
organisation is selected and the Q15A–1 pin is used for Q15 Data Output. When the
BYTEV_PP pin is at V_IL the Byte-wide organisation 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 V_IL the lower 8 bits of the 16 bit data are
selected and with A–1 at V_IH the upper 8 bits of the 16 bit data are selected.
The M27C160 has two control functions, both of which must be logically active in order to
obtain data at the outputs. In addition the Word-wide or Byte- wide organisation must be
selected.
Chip Enable (E) is the power control and should be used for device selection. Output Enable
(G) is the output control and should be used to gate data to the output pins independent of
device selection. Assuming that the addresses are stable, the address access time (t_AVQV)
is equal to the delay from E to output (t_ELQV). Data is available at the output after a delay of
t_GLQV from the falling edge of G, assuming that E has been low and the addresses have
been stable for at least t_AVQV-t_GLQV.
Standby mode
The M27C160 has a standby mode which reduces the active current from 50mA to 100µA.
The M27C160 is placed in the standby mode by applying a CMOS high signal to the E input.
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