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MX27C8000AQC-15 Datasheet(PDF) 2 Page - Macronix International

Part # MX27C8000AQC-15
Description  8M-BIT [1M x8] CMOS EPROM
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Manufacturer  MCNIX [Macronix International]
Direct Link  http://www.macronix.com
Logo MCNIX - Macronix International

MX27C8000AQC-15 Datasheet(HTML) 2 Page - Macronix International

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MX27C8000A
REV.1.2, JUL. 19, 2001
P/N: PM00764
PROGRAM INHIBIT MODE
Programming of multiple MX27C8000As in parallel with
different data is also easily accomplished by using the
Program Inhibit Mode. Except for CE and OE, all like
inputs of the parallel MX27C8000A may be common. A
TTL low-level program pulse applied to an MX27C8000A
CE input with OE/VPP = 12.5 ± 0.5 Vwill program that
MX27C8000A. A high-level CE input inhibits the other
MX27C8000As from being programmed.
PROGRAM VERIFY MODE
Verification should be performed on the programmed bits
to determine that they were correctly programmed. The
verification should be performed with OE /VPPand CE,
at VIL, data should be verified tDV after the falling edge
of CE.
AUTO IDENTIFY MODE
The auto identify mode allows the reading out of a binary
code from an EPROM that will identify its manufacturer
and device type. This mode is intended for use by
programming equipment for the purpose of automatically
matching the device to be programmed with its
corresponding programming algorithm. This mode is
functional in the 25°C ± 5°C ambient temperature range
that is required when programming the MX27C8000A.
To activate this mode, the programming equipment must
force 12.0 ± 0.5 V on address line A9 of the device. Two
identifier bytes may then be sequenced from the device
outputs by toggling address line A0 from VIL to VIH. All
other address lines must be held at VIL during auto
identify mode.
Byte 0 ( A0 = VIL) represents the manufacturer code, and
byte 1 (A0 = VIH), the device identifier code. For the
MX27C8000A, these two identifier bytes are given in the
Mode Select Table. All identifiers for manufacturer and
device codes will possess odd parity, with the MSB (Q7)
defined as the parity bit.
READ MODE
The MX27C8000A has two control functions, both of
which must be logically satisfied in order to obtain data
at the outputs. Chip Enable (CE) is the power control and
FUNCTIONAL DESCRIPTION
THE PROGRAMMING OF THE MX27C8000A
When the MX27C8000A is delivered, or it is erased, the
chip has all 8M bits in the "ONE" or HIGH state. "ZEROs"
are loaded into the MX27C8000A through the procedure
of programming.
For programming, the data to be programmed is applied
with 8 bits in parallel to the data pins.
Vcc must be applied simultaneously or before Vpp, and
removed simultaneously or after Vpp.
When
programming an MXIC EPROM, a 0.1uF capacitor is
required across Vpp and ground to suppress spurious
voltage transients which may damage the device.
FAST PROGRAMMING
The device is set up in the fast programming mode when
the programming voltage OE/VPP = 12.75V is applied,
with VCC = 6.25 V (Algorithm is shown in Figure 1). The
programming is achieved by applying a single TTL low
level 50us pulse to the CE input after addresses and data
line are stable. If the data is not verified, an additional
pulse is applied for a maximum of 25 pulses. This
process is repeated while sequencing through each
address of the device. When the programming mode is
completed, the data in all address is verified at VCC = 5V
±
10%.
BLOCK DIAGRAM
CONTROL
LOGIC
OUTPUT
BUFFERS
Q0~Q7
CE
OE/VPP
A0~A19
ADDRESS
INPUTS
Y-DECODER
X-DECODER
Y-SELECT
8M BIT
CELL
MAXTRIX
VCC
GND
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