M27W1282-100M1 STMicroelectronics, M27W1282-100M1 Datasheet - Page 4

• Manufacturer Part Number: M27W1282-100M1
• Manufacturer: STMicroelectronics

Specifications of M27W1282-100M1

• Interface Type: Parallel
• In System Programmable: External
• Access Time (max): 100ns
• Package Type: SO
• Reprogramming Technique: OTP
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Supply Current: 20mA
• Pin Count: 44
• Mounting: Surface Mount
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Not Compliant

M27W1282
SUMMARY DESCRIPTION
The M27W1282 is a 128 Mbit (8Mb x16) non-volatile,
One Time Programmable (OTP), FlexibleROM™
Memory. Read operations can be performed using a
single low voltage (2.7 to 3.6V) supply. Program op-
erations require an additional V
power supply. On power-up the memory defaults to
Read mode where it can be read in the same way as
a ROM or EPROM.
The Mask-ROM compatibility is obtained using a
dual function Address/Voltage Supply pin (A22/
V
address pin; in Program mode it also works as a
voltage supply pin. At the beginning of any pro-
gram operation, a specific procedure (see Figure
4) must be performed to internally memorize the
A22 value that will be used during the program op-
eration.
Program commands are written to the Command
Interface of the memory. An on-chip Program Con-
troller (PC) simplifies the process of programming
the memory by taking care of all of the special op-
erations that are required to update the memory
contents.
The device is composed of two 64Mbit memories
assembled side by side in a single package. Rec-
ommended operating conditions do not allow both
memories to be active at the same time. Address
Figure 2. Logic Diagram
4/22
PP
A0-A21
). In Read mode the A22/V
G
E
22
V CC
M27W1282
V SS
A22/V PP
PP
PP
16
pin works as an
(11.4 to 12.6V)
DQ0-DQ15
AI08220
A22 selects the memory to be enabled. The other
memory is in Standby mode.
In Read mode the A22 pin works as an address
pin: A22 at V
lectrs the Bottom die. At the beginning of any pro-
gram operation, a specific procedure (see Figure
4) must be performed to internally memorize the
A22 value that will be used during the program op-
eration.
The M27W1282 features an innovative command,
Multiple Word Program, used to program large
streams of data. It greatly reduces the total pro-
gramming time when a large number of Words are
written to the memory at any one time. Using this
command the entire memory can be programmed
in 8s, compared to 36s using the standard Word
Program.
The end of a program operation can be detected
and any error conditions identified. The command
set required to control the memory is consistent
with JEDEC standards.
Chip Enable and Output Enable signals control the
bus operation of the memory. They allow simple
connection to most microprocessors, often without
additional logic.
The memory is offered in SO44 package and is
supplied with all the bits set to ’1’.
Table 1. Signal Names
A0-A21
A22/V
DQ0-DQ15
E
G
V
V
CC
SS
PP
IH
Address Inputs
Address Input/Supply Voltage for
Program
Data Inputs/Outputs
Chip Enable
Output Enable
Supply Voltage read
Ground
selects the Top die; A22 at V
IL
se-