Description
M25P40
1
Description
The M25P40 is a 4 Mbit (512 K × 8) Serial Flash memory, with advanced write protection
mechanisms, accessed by a high speed SPI-compatible bus. The M25P40 features high
performance instructions allowing clock frequency up to 75 MHz.(1)
The memory can be programmed 1 to 256 bytes at a time, using the Page Program
instruction.
The memory is organized as 8 sectors, each containing 256 pages. Each page is 256 bytes
wide. Thus, the whole memory can be viewed as consisting of 2048 pages, or 524,288
bytes.
The whole memory can be erased using the Bulk Erase instruction, or a sector at a time,
using the Sector Erase instruction.
In order to meet environmental requirements, Numonyx offers the M25P40 in RoHS
compliant packages, which are Lead-free. RoHS specifications are available at:
www.Numonyx.com.
Important: This datasheet details the functionality of the M25P40 devices, based on the previous T7Y
process or based on the current T9HX process (available since August 2008). The new
device in T9HX is completely backward compatible with the old one in T7Y and it additionaly
features:
-
improved max frequency (Fast Read) to 75 MHz in the standard Vcc range 2.7 V to
3.6 V, while the max frequency (Fast Read) in the extended Vcc range 2.3 V to 2.7 V is
40 MHz
-
UID/CFD protection feature
Figure 1. Logic diagram
V
CC
D
C
S
Q
M25P40
W
HOLD
V
SS
AI04090
1. 75 MHz operation is available only on the VCC range 2.7 V - 3.6 V and for process technology T9HX devices,
identified by process identification digit "4" in the device marking and process letter "B" in the part number.
6/57
NUMONYX [ NUMONYX B.V ]
