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25LC256 Datasheet

  • 25LC256

  • SPI Serial EEPROM Family

  • 921.11KB

  • 44页

  • Microchip

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25AA256/25LC256
256K SPI
鈩?/div>
Bus Serial EEPROM
Device Selection Table
Part Number
25LC256
25AA256
V
CC
Range
2.5-5.5V
1.8-5.5V
Page Size
64 Byte
64 Byte
Temp. Ranges
I, E
I
Packages
P, SN, ST, MF
P, SN, ST, MF
Features
鈥?Max. clock 10 MHz
鈥?Low-power CMOS technology
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 5 mA at 5.5V, 10 MHz
- Standby Current: 1
碌A
at 5.5V
鈥?32,768 x 8-bit organization
鈥?64 byte page
鈥?Self-timed ERASE and WRITE cycles (5 ms
max.)
鈥?Block write protection
- Protect none, 1/4, 1/2 or all of array
鈥?Built-in write protection
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
鈥?Sequential read
鈥?High reliability
- Endurance: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
鈥?Temperature ranges supported;
- Industrial (I):
-40掳C to +85掳C
- Automotive (E):
-40掳C to +125掳C
鈥?Standard and Pb-free packages available
Description
The Microchip Technology Inc. 25AA256/25LC256
(25XX256
*
) are 256k-bit Serial Electrically Erasable
PROMs. The memory is accessed via a simple Serial
Peripheral Interface鈩?(SPI鈩? 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 25XX256 is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packaging including 8-lead DFN and 8-lead TSSOP.
Pb-free (Pure Sn) finish is also available.
Package Types (not to scale)
TSSOP
(ST)
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
25LC256
Pin Function Table
Name
CS
SO
WP
V
SS
SI
SCK
HOLD
V
CC
Function
Chip Select Input
Serial Data Output
Write-Protect
Ground
Serial Data Input
Serial Clock Input
Hold Input
Supply Voltage
CS 1
DFN
(MF)
8
25LC256
7
6
5
V
CC
HOLD
SCK
SI
SO 2
WP 3
V
SS
4
SPI is a registered trademark of Motorola Corporation.
* 25XX256 is used in this document as a generic part number for the 25AA256, 25LC256 devices.
铮?/div>
2003 Microchip Technology Inc.
Preliminary
DS21822C-page 1

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