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PDF ( 数据手册 , 数据表 ) 23A256

零件编号 23A256
描述 256K SPI Bus Low-Power Serial SRAM
制造商 Microchip Technology
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23A256 数据手册, 描述, 功能
23A256/23K256
256K SPI Bus Low-Power Serial SRAM
Device Selection Table
Part Number
23K256
23A256
VCC Range
2.7-3.6V
1.5-1.95V
Page Size
32 Byte
32 Byte
Features:
• Max. Clock 20 MHz
• Low-Power CMOS Technology:
- Read Current: 3 mA at 1 MHz
- Standby Current: 4 A Max. at +85°C
• 32,768 x 8-bit Organization
• 32-Byte Page
• HOLD pin
• Flexible Operating modes:
- Byte read and write
- Page mode (32 Byte Page)
- Sequential mode
• Sequential Read/Write
• High Reliability
• Temperature Ranges Supported:
- Industrial (I):
-40C to +85C
- Automotive (E):
-40C to +125C
• Pb-Free and RoHS Compliant, Halogen Free
Pin Function Table
Name
Function
CS
SO
VSS
SI
SCK
HOLD
VCC
Chip Select Input
Serial Data Output
Ground
Serial Data Input
Serial Clock Input
Hold Input
Supply Voltage
Temp. Ranges
I, E
I
Packages
P, SN, ST
P, SN, ST
Description:
The Microchip Technology Inc. 23X256 are 256 Kbit
Serial SRAM devices. The memory is accessed via a
simple Serial Peripheral Interface (SPI) compatible
serial bus. The bus signals required are a clock input
(SCK) plus separate data in (SI) and data out (SO)
lines. Access to the device is controlled through a Chip
Select (CS) input.
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused,
transitions on its inputs will be ignored, with the
exception of Chip Select, allowing the host to service
higher priority interrupts.
The 23X256 is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packaging including 8-lead TSSOP.
Package Types (not to scale)
PDIP/SOIC/TSSOP
(P, SN, ST)
CS 1
SO 2
NC 3
VSS 4
8 VCC
7 HOLD
6 SCK
5 SI
2008-2011 Microchip Technology Inc.
DS22100F-page 1







23A256 pdf, 数据表
23A256/23K256
FIGURE 2-3: PAGE READ SEQUENCE
CS
SCK
0 1 2 3 4 5 6 7 8 9 10 11
21 22 23 24 25 26 27 28 29 30 31
Instruction
16-bit Address
SI 0 0 0 0 0 0 1 1 15 14 13 12
210
Page X, Word Y
SO High Impedance
Page X, Word Y
765432 10
CS
SCK
SI
SO
32 33 34 35 36 37 38 39
Page X, Word Y+1
76543210
Page X, Word 31
Page X, Word 0
7654321076543210
FIGURE 2-4:
PAGE WRITE SEQUENCE
CS
SCK
SI
0 1 2 3 4 5 6 7 8 9 10 11
21 22 23 24 25 26 27 28 29 30 31
Instruction
16-bit Address
Page X, Word Y
0 0 0 0 0 0 1 0 15 14 13 12
210765432 10
Page X, Word Y
CS
SCK
SI
32 33 34 35 36 37 38 39
Page X, Word Y+1
76543210
Page X, Word 31
Page X, Word 0
7654321076543210
DS22100F-page 8
2008-2011 Microchip Technology Inc.







23A256 equivalent, schematic
23A256/23K256
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS22100F-page 16
2008-2011 Microchip Technology Inc.










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