25LC1024-I/SN Microchip Technology, 25LC1024-I/SN Datasheet - Page 17

• Manufacturer Part Number: 25LC1024-I/SN
• Description: IC, EEPROM, 1MBIT, SERIAL, 20MHZ, SOIC-8
• Manufacturer: Microchip Technology

Specifications of 25LC1024-I/SN

• Memory Size: 1Mbit
• Ic Interface Type: SPI
• Clock Frequency: 20MHz
• Supply Voltage Range: 2.5V To 5.5V
• Memory Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Memory Configuration: 128K X 8
• Interface Type: Serial, SPI

2.13
Once the device has entered Deep Power-down mode
all instructions are ignored except the Release from
Deep Power-down and Read Electronic Signature
command. This command can also be used when the
device is not in Deep Power-down to read the
electronic signature out on the SO pin unless another
command is being executed such as Erase, Program
or Write Status Register.
FIGURE 2-12:
Driving CS high after the 8-bit RDID command but before the Electronic Signature has been transmitted will still ensure
the device will be taken out of Deep Power-down mode. However, there is a delay T
returns to Standby mode (I
FIGURE 2-13:
 2003 Microchip Technology Inc.
SCK
SO
CS
SI
RELEASE FROM DEEP POWER-
DOWN AND READ ELECTRONIC
SIGNATURE
1
0
SCK
CS
SO
SI
0
1
1
instruction
2
RELEASE FROM DEEP POWER-DOWN AND READ ELECTRONIC SIGNATURE
RELEASE FROM DEEP POWER-DOWN AND READ ELECTRONIC SIGNATURE
1
0
0
3
CCS
0
1
1
4
), as shown in Figure 2-13.
1
instruction
2
0
5
high-impedance
0
3
1
6
1
4
1
7
0
23 22 21 20
5
8
high-impedance
1
6
9 10 11
Preliminary
1
7
24-bit address
Release from Deep Power-down mode and Read
Electronic Signature is entered by driving CS low,
followed by the RDID instruction code (Figure 2-12)
and then a dummy address of 24 bits (A23-A0). After
the last bit of the dummy address is clock in, the 8-bit
Electronic signature is clocked out on the SO pin.
After the signature has been read out at least once,
the sequence can be terminated by driving CS high.
The device will then return to Standby mode and will
wait to be selected so it can be given new instructions.
If additional clock cycles are sent after the electronic
signature has been read once, it will continue to output
the signature on the SO line until the sequence is
terminated.
25AA1024/25LC1024
29 30 31 32 33 34 35 36 37 38 39
2
1
0
T
REL
7
0
Electronic Signature Out
REL
Manufacturers ID 0x29
6
0
that occurs before the device
5
1
4
0
3
1
DS21836A-page 17
2
0
1
0
0
1