23A256-I/ST Microchip Technology, 23A256-I/ST Datasheet - Page 6

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

Specifications of 23A256-I/ST

• Memory Size: 256K (32K x 8)
• Package / Case: 8-TSSOP
• 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

23A256/23K256
TABLE 2-1:
FIGURE 2-1:
FIGURE 2-2:
DS22100C-page 6
SCK
Instruction Name
CS
SO
SI
SCK
CS
SO
SI
WRITE
READ
RDSR
WRSR
0
0
0
0
0
1
1
0
0
INSTRUCTION SET
BYTE READ SEQUENCE
BYTE WRITE SEQUENCE
Instruction
2
0
2
Instruction
0
3
3
0
0
4
Instruction Format
0
0000 0011
0000 0010
0000 0101
0000 0001
4
0
5
High-Impedance
5
0
1
6
High-Impedance
6
1
0
7
15 14 13 12
1
7
8
15 14 13 12
8
9 10 11
9 10 11
16-bit Address
Read data from memory array beginning at selected address
Write data to memory array beginning at selected address
Read STATUS register
Write STATUS register
Preliminary
16-bit Address
21 22 23 24 25 26 27 28 29 30 31
2
1
2
21 22 23 24 25 26 27 28 29 30 31
0 7
1
0
Description
6
7
5
Data Byte
6
© 2009 Microchip Technology Inc.
4
5
3
Data Out
4
2
3
1
2
0
1
0