Datasheet

 2008-2011 Microchip Technology Inc. DS22100F-page 1
23A256/23K256
Device Selection Table
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:
• Pb-Free and RoHS Compliant, Halogen Free
Pin Function Table
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)
Part Number VCC Range Page Size Temp. Ranges Packages
23K256 2.7-3.6V 32 Byte I, E P, SN, ST
23A256 1.5-1.95V 32 Byte I P, SN, ST
- Industrial (I):
- Automotive (E):
-40C
-40C
to
to
+85C
+125C
Name Function
CS
Chip Select Input
SO Serial Data Output
V
SS Ground
SI Serial Data Input
SCK Serial Clock Input
HOLD
Hold Input
V
CC Supply Voltage
CS
SO
NC
V SS
1
2
3
4
8
7
6
5
V CC
HOLD
SCK
SI
PDIP/SOIC/TSSOP
(P, SN, ST)
256K SPI Bus Low-Power Serial SRAM