Symbol Parameter Value Unit
T
A
Ambient Operating Temperature
(2)
–40to85 °C
T
STG
Storage TemperatureRange – 65 to 150
°
C
V
CC
Supply Voltage – 0.3 to 6.5 V
V
IO
Input/Output Voltage – 0.3 to VCC+0.6 V
V
I
Input Voltage – 0.3 to 6.5 V
V
ESD
Electrostatic Discharge Voltage (Human Body model) 3000 V
Notes:
1. Except for therating ”Operating Temperature Range”, stressesabove thoselistedin theTable ”AbsoluteMaximum Ratings”
may cause permanentdamage to thedevice. Theseare stress ratingsonly and operationof the deviceat these or any other
conditions above those indicated inthe Operatingsections of this specification is not implied. Exposure to Absolute Maximum
Rating conditions for extendedperiods may affectdevice reliability.Refer also tothe STMicroelectronics SURE Programand other
relevant qualitydocuments.
2. Depends on range.
Table2. AbsoluteMaximum Ratings
(1)
Mode E G W DQ0 - DQ7
Read V
IL
V
IL
V
IH
Data Out
Write V
IL
V
IH
V
IL
Data In
Standby / Write Inhibit V
IH
X X Hi-Z
Write Inhibit X X V
IH
Data Out or Hi-Z
Write Inhibit X V
IL
X Data Out or Hi-Z
Output Disable X V
IH
X Hi-Z
Note:
X=V
IH
or V
IL
Table3. OperatingModes
The circuit has been designed to offer a flexible
microcontroller interface featuring both hardware
andsoftwarehandshakingmode withReady/Busy,
Data Polling and Toggle Bit. The M28C16A/17A
supports32 bytepage write operation.
PIN DESCRITPION
Addresses (A0-A10).
The address inputs select
an 8-bit memory location during a read or write
operation.
Chip Enable (E).
The chip enable input must be
lowtoenableall read/writeoperations.WhenChip
Enableishigh,power consumptionis reduced.
OutputEnable (G).
The OutputEnableinput controls the data output buffersand is used to initiate
readoperations.
DataIn/Out(DQ0-DQ7).
Datais writtentoorread
fromthe M28C16A/17Athroughthe I/O pins.
WriteEnable(W).
TheWriteEnableinputcontrols
the writingof data to the M28C16A/17A.
Ready/Busy (RB).
Ready/Busy is an open drain
output that can be used to detect the end of the
internalwritecycle.Ready/Busyisavailablefor the
M28C17Ain PDIP, PLCC and SO packages,and
for the M28C16Ain TSOPonly.
OPERATION
Inorderto preventdata corruptionand inadvertent
write operations during power-up, a Power On
Reset(POR)circuitresetsallinternalprogramming
cicuitry. Access to the memory in write mode is
allowedaftera power-upas specifiedin Table7.
Read
The M28C16A/17Ais accessedlike a staticRAM.
When E and G are low with W high, the data
addressed is presented on the I/O pins. The I/O
pinsarehighimpedancewheneitherGorEishigh.
DESCRIPTION
(cont’d)
3/19
M28C16A, M28C17A