Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼

Delete All


Preview PDF Download HTML

CAT25C128 Datasheet(PDF) 5 Page - Catalyst Semiconductor

No. de Pieza. CAT25C128
Descripción  128K/256K-Bit SPI Serial CMOS E2PROM
Descarga  11 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  CATALYST [Catalyst Semiconductor]
Página de inicio

CAT25C128 Datasheet(HTML) 5 Page - Catalyst Semiconductor

Zoom Inzoom in Zoom Outzoom out
 5 / 11 page
background image
Doc. No. 25088-00 1/01
The CAT25C128/256 supports the SPI bus data trans-
mission protocol. The synchronous Serial Peripheral
Interface (SPI) helps the CAT25C128/256 to interface
directly with many of today’s popular microcontrollers.
The CAT25C128/256 contains an 8-bit instruction regis-
ter. (The instruction set and the operation codes are
detailed in the instruction set table)
After the device is selected with
CS going low, the first
byte will be received. The part is accessed via the SI pin,
with data being clocked in on the rising edge of SCK.
The first byte contains one of the six op-codes that define
the operation to be performed.
SI: Serial Input
SI is the serial data input pin. This pin is used to input all
opcodes, byte addresses, and data to be written to the
25C128/256. Input data is latched on the rising edge of
the serial clock.
SO: Serial Output
SO is the serial data output pin. This pin is used to
transfer data out of the 25C128/256. During a read cycle,
data is shifted out on the falling edge of the serial clock.
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to synchro-
nize the communication between the microcontroller
and the 25C128/256. Opcodes, byte addresses, or data
present on the SI pin are latched on the rising edge of the
SCK. Data on the SO pin is updated on the falling edge
of the SCK.
CS: Chip Select
CSis the Chip select pin. CS low enables the CAT25C128/
256 and
CS high disables the CAT25C128/256. CS high
takes the SO output pin to high impedance and forces
the device into a Standby Mode (unless an internal write
operation is underway)
The CAT25C128/256 draws
ZERO current in the Standby mode. A high to low
transition on
CS is required prior to any sequence being
initiated. A low to high transition on
CS after a valid write
sequence is what initiates an internal write cycle.
WP: Write Protect
WP is the Write Protect pin. The Write Protect pin will
allow normal read/write operations when held high.
WP is tied low and the WPEN bit in the status
register is set to “1”, all write operations to the status
register are inhibited.
WP going low while CS is still low
will interrupt a write to the status register. If the internal
write cycle has already been initiated,
WP going low will
have no effect on any write operation to the status
register. The
WP pin function is blocked when the WPEN
bit is set to 0.
HOLD: Hold
HOLD is the HOLD pin. The HOLD pin is used to pause
transmission to the CAT25C128/256 while in the middle
of a serial sequence without having to re-transmit entire
sequence at a later time. To pause,
HOLD must be
brought low while SCK is low. The SO pin is in a high
impedance state during the time the part is paused, and
transitions on the SI pins will be ignored. To resume
HOLD is brought high, while SCK is low.
(HOLD should be held high any time this function is not
being used.)
HOLD may be tied high directly to Vcc or tied
to Vcc through a resistor. Figure 9 illustrates hold timing
0000 0110
Enable Write Operations
0000 0100
Disable Write Operations
0000 0101
Read Status Register
0000 0001
Write Status Register
0000 0011
Read Data from Memory
0000 0010
Write Data to Memory

Html Pages

1  2  3  4  5  6  7  8  9  10  11 

Datasheet Download

Número de Pieza relacionado

Part NumberComponents DescriptionHtml ViewManufacturer
CAT25C011K/2K/4K/8K/16K SPI Serial CMOS E2PROM 1 2 3 4 5 MoreCatalyst Semiconductor
CAT25C032K/4K/8K/16K/32K SPI Serial CMOS E2PROM 1 2 3 4 5 MoreCatalyst Semiconductor
CAT25C3232K/64K-Bit SPI Serial CMOS E2PROM 1 2 3 4 5 MoreCatalyst Semiconductor
CAT25C6464K/128K-Bit SPI Serial CMOS E2PROM 1 2 3 4 5 MoreCatalyst Semiconductor
AK6512CASPI bus 64Kbit Serial CMOS EEPROM 1 2 3 4 5 MoreAsahi Kasei Microsystems
X25320SPI Serial E2PROM With Block LockTM Protection 1 2 3 4 5 MoreXicor Inc.
CAT25CXXXSupervisory Circuits with SPI Serial E2PROM Precision Reset Controller and Watchdog Timer 1 2 3 4 5 MoreCatalyst Semiconductor
CAT24WC3232K/64K-Bit I2C Serial CMOS E2PROM 1 2 3 4 5 MoreCatalyst Semiconductor
S-93C46ACMOS SERIAL E2PROM 1 2 3 4 5 MoreSeiko Instruments Inc
CAT25C6532K/64K-Bit SPI Serial CMOS EEPROM 1 2 3 4 5 MoreCatalyst Semiconductor

Enlace URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved©

Mirror Sites
English :  |   English :  |   Chinese :  |   German :  |   Japanese :
Russian :  |   Korean :  |   Spanish :  |   French :  |   Italian :
Portuguese :  |   Polish :  |   Vietnamese :