MX27C8100MC-10 MCNIX [Macronix International], MX27C8100MC-10 Datasheet - Page 3

• Manufacturer Part Number: MX27C8100MC-10
• Description: 8M-BIT [1M x8/512K x16] CMOS OTP ROM
• Manufacturer: MCNIX [Macronix International]

FUNCTIONAL DESCRIPTION
THE PROGRAMMING OF THE MX27C8100
When the MX27C8100 is delivered, the chip has all 8M
bits in the "ONE" or HIGH state. "ZEROs" are loaded into
the MX27C8100 through the procedure of programming.
For programming, the data to be programmed is applied
with 16 bits in parallel to the data pins.
Vcc must be applied simultaneously or before Vpp, and
removed simultaneously or after Vpp.
programming an MXIC One Time Programmable Read
Only Memory, 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 VPP = 12.75V is applied, with
VCC = 6.25 V and OE = VIH (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 =
VPP = 5V ± 10%.
PROGRAM INHIBIT MODE
Programming of multiple MX27C8100's 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 MX27C8100 may be common. A
TTL low-level program pulse applied to an MX27C8100
CE input with VPP = 12.5 ± 0.5 V will program the
MX27C8100. A high-level CE input inhibits the other
MX27C8100 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 at VIL, CE at
VIH, and VPP at its programming voltage.
P/N: PM0261
When
3
AUTO IDENTIFY MODE
The auto identify mode allows the reading out of a binary
code from an One Time Programmable Read Only
Memory 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 MX27C8100.
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
MX27C8100, 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 (Q15)
defined as the parity bit.
READ MODE
The MX27C8100 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
should be used for device selection. Output Enable (OE)
is the output control and should be used to gate data to
the output pins, independent of device selection.
Assuming that addresses are stable, address access
time (tACC) is equal to the delay from CE to output (tCE).
Data is available at the outputs tOE after the falling edge
of OE's, assuming that CE has been LOW and addresses
have been stable for at least tACC - t OE.
WORD-WIDE MODE
With BYTE/VPP at VCC ± 0.2V outputs Q0-7 present
data Q0-7 and outputs Q8-15 present data Q8-15, after
CE and OE are appropriately enabled.
MX27C8100
REV. 2.4, NOV. 19, 2002