MX27C1100/27C1024
1M-BIT [128K x 8/64K x 16] CMOS EPROM
FEATURES
•
64K x 16 organization(MX27C1024, JEDEC pin out)
•
128K x 8 or 64K x 16 organization(MX27C1100, ROM
•
•
•
•
pin out compatible)
+12.5V programming voltage
Fast access time: 55/70/85/100/120/150 ns
Totally static operation
Completely TTL compatible
•
Operating current: 40mA
•
Standby current: 100uA
•
Package type:
- 40 pin plastic DIP
- 40 pin plastic SOP
- 44 pin PLCC
GENERAL DESCRIPTION
The MX27C1024 is a 5V only, 1M-bit, One Time
Programmable Read Only Memory. It is organized as
64K words by 16 bits per word(MX27C1024), 128K x 8
or 64K x 16(MX27C1100), operates from a single + 5
volt supply, has a static standby mode, and features
fast single address location programming. All program-
ming signals are TTL levels, requiring a single pulse. For
programming outside from the system, existing
EPROM programmers may be used. The MX27C1100/
1024 supports a intelligent fast programming algorithm
which can result in programming time of less than thirty
seconds.
This EPROM is packaged in industry standard 40 pin
dual-in-line packages, 40 lead SOP and 44 lead PLCC
packages.
PIN CONFIGURATIONS
PDIP/SOP(MX27C1100)
NC
A7
A6
A5
A4
A3
A2
A1
A0
CE
GND
OE
Q0
Q8
Q1
Q9
Q2
Q10
Q3
Q11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
A8
A9
A10
A11
A12
A13
A14
A15
NC
BYTE/VPP
GND
Q15/A-1
Q7
Q14
Q6
Q13
Q5
Q12
Q4
VCC
BLOCK DIAGRAM (MX27C1100)
CE
OE
BYTE/VPP
CONTROL
LOGIC
OUTPUT
BUFFERS
Q0~Q14
Q15/A-1
MX27C1100
.
.
.
A0~A15
ADDRESS
INPUTS
.
.
.
.
.
VCC
GND
Y-DECODER
.
.
.
.
.
.
.
.
Y-SELECT
1M BIT
CELL
MAXTRIX
X-DECODER
P/N: PM0156
REV. 4.6, JAN. 14, 2003
1
MX27C1100/27C1024
FUNCTIONAL DESCRIPTION
THE PROGRAMMING OF THE MX27C1100/1024
When the MX27C1100/1024 is delivered, or it is
erased, the chip has all 1M bits in the "ONE" or HIGH
state. "ZEROs" are loaded into the MX27C1100/1024
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. 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.
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 MX27C1100/1024.
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
MX27C1100/1024, 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.
VIL(for MX27C1024), OE at VIL, CE at VIH(for
MX27C1100)and VPP at its programming voltage.
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 PGM = VIL(or OE = VIH) (Algorithm
is shown in Figure 1). The programming is achieved by
applying a single TTL low level 100us pulse to the PGM
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%.
READ MODE
The MX27C1100/1024 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.
PROGRAM INHIBIT MODE
Programming of multiple MX27C1100/1024'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 MX27C1100/1024 may be
common. A TTL low-level program pulse applied to an
MX27C1100/1024 CE input with VPP = 12.5
±
0.5 V will
program the MX27C1100/1024. A high-level CE input
inhibits the other MX27C1100/1024s from being
programmed.
WORD-WIDE MODE
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 and CE at
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.
P/N: PM0156
4
REV. 4.6, JAN. 14, 2003
MX27C1100/27C1024
BYTE-WIDE MODE
With BYTE/VPP at GND
±
0.2V, outputs Q8-15 are tri-
stated. If Q15/A-1 = VIH, outputs Q0-7 present data bits
Q8-15. If Q15/A-1 = VIL, outputs Q0-7 present data bits
Q0-7.
arrays, a 4.7 uF bulk electrolytic capacitor should be
used between VCC and GND for each eight devices.
The location of the capacitor should be close to where
the power supply is connected to the array.
STANDBY MODE
The MX27C1100/1024 has a CMOS standby mode
which reduces the maximum VCC current to 100 uA. It
is placed in CMOS standby when CE is at VCC
±
0.3 V.
The MX27C1100/1024 also has a TTL-standby mode
which reduces the maximum VCC current to 1.5 mA. It
is placed in TTL-standby when CE is at VIH. When in
standby mode, the outputs are in a high-impedance
state, independent of the OE input.
TWO-LINE OUTPUT CONTROL FUNCTION
To accommodate multiple memory connections, a two-
line control function is provided to allow for:
1. Low memory power dissipation,
2. Assurance that output bus contention will not
occur.
It is recommended that CE be decoded and used as the
primary device-selecting function, while OE be made a
common connection to all devices in the array and
connected to the READ line from the system control bus.
This assures that all deselected memory devices are in
their low-power standby mode and that the output pins
are only active when data is desired from a particular
memory device.
SYSTEM CONSIDERATIONS
During the switch between active and standby
conditions, transient current peaks are produced on the
rising and falling edges of Chip Enable. The magnitude
of these transient current peaks is dependent on the
output capacitance loading of the device. At a minimum,
a 0.1 uF ceramic capacitor (high frequency, low inherent
inductance) should be used on each device between
Vcc and GND to minimize transient effects. In addition,
to overcome the voltage drop caused by the inductive
effects of the printed circuit board traces on EPROM
P/N: PM0156
5
REV. 4.6, JAN. 14, 2003
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