23A256-I/SN Microchip Technology, 23A256-I/SN Datasheet - Page 11

• Manufacturer Part Number: 23A256-I/SN
• Description: IC SRAM 256KBIT 20MHZ 8SOIC
• Manufacturer: Microchip Technology
• Type: Synchronousr

Specifications of 23A256-I/SN

• Memory Size: 256K (32K x 8)
• Package / Case: 8-SOIC (3.9mm Width)
• Format - Memory: RAM
• Memory Type: SRAM
• Speed: 20MHz
• Interface: SPI Serial
• Voltage - Supply: 1.7 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Access Time: 32 ns
• Maximum Clock Frequency: 16 MHz
• Supply Voltage (max): 1.95 V
• Supply Voltage (min): 1.5 V
• Maximum Operating Current: 10 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Ports: 1
• Operating Supply Voltage: 1.8 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

2.5
The Read Status Register instruction (RDSR) provides
access to the STATUS register. The STATUS register
may be read at any time. The STATUS register is
formatted as follows:
TABLE 2-2:
FIGURE 2-7:
 2010 Microchip Technology Inc.
MODE MODE
W/R = writable/readable.
W/R
7
CS
SI
SO
SCK
Read Status Register Instruction
(RDSR)
W/R
6
0
0
READ STATUS REGISTER TIMING SEQUENCE (RDSR)
STATUS REGISTER
5
–
0
0
1
High-Impedance
4
–
0
0
Instruction
2
3
–
0
0
3
2
–
0
0
4
0
1
–
1
HOLD
5
W/R
0
0
6
1
7
The mode bits indicate the operating mode of the
SRAM. The possible modes of operation are:
0 0 = Byte mode (default operation)
1 0 = Page mode
0 1 = Sequential mode
1 1 = Reserved
Write and read commands are shown in
Figure
The HOLD bit enables the Hold pin functionality. It must
be set to a ‘0’ before HOLD pin is brought low for HOLD
function to work properly. Setting HOLD to ‘1’ disables
feature.
Bits 1 through 5 are reserved and should always be set
to ‘0’.
See
7
8
Figure 2-7
6
2-8.
9
Data from STATUS Register
10
5
for the RDSR timing sequence.
11
4
12
3
13
2
23X256
14
1
DS22100E-page 11
Figure 2-7
15
0
and