Datasheet CAT25C64S16I-TE13, CAT25C64S16I-1.8TE13, CAT25C64S16A-TE13, CAT25C64S16A-1.8TE13, CAT25C64S16-TE13 Datasheet (CTLST)

Advance Information

CAT25C64/128

64K/128K-Bit SPI Serial CMOS E2PROM
FEATURES

■ 5 MHz SPI Compatible

■1.8 to 6.0 Volt Operation

■Hardware and Software Protection

■Zero Standby Current

■Low Power CMOS Technology

■SPI Modes (0,0)

■Commercial, Industrial and Automotive

Temperature Ranges

DESCRIPTION

■1,000,000 Program/Erase Cycles

■100 Year Data Retention

■Self-Timed Write Cycle

■8-Pin DIP/SOIC, 16-Pin SOIC and 20-Pin TSSOP

■64-Byte Page Write Buffer

■Block Write Protection

– Protect 1/4, 1/2 or all of E2PROM Array

The CAT25C64/128 is a 64K/128K-Bit SPI Serial CMOS
E2PROM internally organized as 8Kx8/16Kx8 bits.
Catalyst’s advanced CMOS Technology substantially
reduces device power requirements. The CAT25C64/
128 features a 64-byte page write buffer. The device
operates via the SPI bus serial interface and is enabled
though a Chip Select (CS). In addition to the Chip Select,
the clock input (SCK), data in (SI) and data out (SO) are

PIN CONFIGURATION

SOIC Package (S)

1

CS
SO

WP

V

SS

8

2

7

3

6

4

5

DIP Package (P)

1

8

CS

2

SO

3

WP

V

SS

4

V

7

HOLD

6

SCK

5

SI

PIN FUNCTIONS

Pin Name Function

SO Serial Data Output
SCK Serial Clock

WP Write Protect
V

CC

V

SS

CS Chip Select
SI Serial Data Input
HOLD Suspends Serial Input

NC No Connect

SOIC Package (S16)

V

CC
HOLD
SCK

SI

CC

+1.8V to +6.0V Power Supply
Ground

CS

NC
NC
NC

WP

V

SS

1
2
3414

5
6
710

16
15

13
12
11

TSSOP Package (U20)

VCC

NC

CS

HOLDSO

SO

NC

SO

NC

NC
NC

NC

WP

NCNC

V

SS

SCK

NC

98

NC

SI

required to access the device. The HOLD pin may be
used to suspend any serial communication without
resetting the serial sequence. The CAT25C64/128 is
designed with software and hardware write protection
features including Block write protection. The device is
available in 8-pin DIP, 8-pin SOIC, 16-pin SOIC and 20­pin TSSOP packages.

BLOCK DIAGRAM

1
2
3
4

5
6
7
8

9
10 11

20
19
18
17
16
15
14
13
12

SO

SI

CS

WP

HOLD

SCK

NC
VCC

HOLD
HOLD

NC
NC
SCK
SI
NC
NC

WORD ADDRESS

BUFFERS

I/O

CONTROL

SPI

CONTROL

LOGIC

BLOCK

PROTECT

LOGIC

STATUS

REGISTER

SENSE AMPS

SHIFT REGISTERS

DECODERS

CONTROL LOGIC

XDEC

HIGH VOLTAGE/

TIMING CONTROL

COLUMN

E2PROM

ARRAY

DATA IN

STORAGE

25C128 F02

© 1999 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

1

Doc No. 25069-00 6/99 SPI-1

CAT25C64/128

Advance Information

ABSOLUTE MAXIMUM RATINGS*

Temperature Under Bias ................. –55°C to +125°C

Storage Temperature....................... –65°C to +150°C

Voltage on any Pin with

Respect to Ground

VCC with Respect to Ground ............... –2.0V to +7.0V

Package Power Dissipation

Capability (Ta = 25°C)................................... 1.0W

(1)

............ –2.0V to +VCC +2.0V

*COMMENT

Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
These are stress ratings only, and functional operation
of the device at these or any other conditions outside of
those listed in the operational sections of this specifica­tion is not implied. Exposure to any absolute maximum
rating for extended periods may affect device perfor­mance and reliability.

Lead Soldering Temperature (10 secs) ............ 300°C

Output Short Circuit Current

(2)

........................ 100 mA

RELIABILITY CHARACTERISTICS

Symbol Parameter Min. Max. Units Reference Test Method

(3)

N
T
V
I

LTH

END

DR

ZAP

(3)

(3)

(3)(4)

Endurance 1,000,000 Cycles/Byte MIL-STD-883, Test Method 1033
Data Retention 100 Years MIL-STD-883, Test Method 1008
ESD Susceptibility 2000 Volts MIL-STD-883, Test Method 3015
Latch-Up 100 mA JEDEC Standard 17

D.C. OPERATING CHARACTERISTICS

VCC = +1.8V to +6.0V, unless otherwise specified.

Limits

Symbol Parameter Min. Typ. Max. Units Test Conditions

I

CC1

Power Supply Current 10 mA VCC = 5V @ 5MHz
(Operating Write) SO=open; CS=Vss

I

CC2

I

SB

I

LI

I

LO

Power Supply Current 2 mA VCC = 5.5V
(Operating Read) F

Power Supply Current 0 µA CS = V

= 5MHz

CLK

CC

(Standby) VIN = VSS or V
Input Leakage Current 2 µA
Output Leakage Current 3 µAV

= 0V to VCC,

OUT

CC

CS = 0V

(3)

V
V
V
V

V
V

IL

(3)

IH
OL1
OH1

OL2
OH2

Input Low Voltage -1 VCC x 0.3 V
Input High Voltage VCC x 0.7 V
Output Low Voltage 0.4 V
Output High Voltage VCC - 0.8 V

+ 0.5 V

CC

4.5V≤VCC<5.5V
IOL = 3.0mA
IOH = -1.6mA

Output Low Voltage 0.2 V 1.8V≤VCC<2.7V
Output High Voltage VCC-0.2 V IOL = 150µA

IOH = -100µA

Note:
(1) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20 ns. Maximum DC

voltage on output pins is VCC +0.5V, which may overshoot to VCC +2.0V for periods of less than 20 ns.
(2) Output shorted for no more than one second. No more than one output shorted at a time.
(3) This parameter is tested initially and after a design or process change that affects the parameter.
(4) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to VCC +1V.

Doc. No. 25069-00 6/99 SPI-1

2

Advance Information

CAT25C64/128

Figure 1.Sychronous Data Timing

V

IH

CS

V

SCK

SO

SI

IL

t

CSS

V

IH

V

IL

V

IH

V

IL

V

OH

HI-Z

V

OL

t

SU

VALID IN

t

WH

t

H

t

WL

t

RI

t

FI

t

V

t

HO

t

CSH

t

DIS

HI-Z

A.C. CHARACTERISTICS

Limits

Vcc= VCC =VCC =

1.8V-6V 2.5V-6V 4.5V-5.5V Test

SYMBOLPARAMETER Min. Max. Min. Max. Min. Max. UNITSConditions

t

CS

t

SU

t

H

t

WH

t

WL

f

SCK

t

LZ

(1)

t

RI

(1)

t

FI

t

HD

t

CD

t

WC

t

V

t

HO

t

DIS

t

HZ

t

CS

t

CSS

Data Setup Time 100 70 35 ns
Data Hold Time 100 70 35 ns
SCK High Time 250 150 80 ns
SCK Low Time 250 150 80 ns
Clock Frequency DC 1 DC 3 DC 5 MHz
HOLD to Output Low Z 50 50 50 ns
Input Rise Time 2 2 2 µs
Input Fall Time 2 2 2 µs

HOLD Setup Time 250 250 40 ns
HOLD Hold Time 250 250 40 ns

Write Cycle Time 10 10 5 ms
Output Valid from Clock Low 250 220 100 ns
Output Hold Time 0 0 0 ns
Output Disable Time 250 250 100 ns

HOLD to Output High Z 150 150 50 ns
CS High Time 1000 330 200 ns
CS Setup Time 1000 100 100 ns

CL = 50pF

t

CSH

NOTE:

(1) This parameter is tested initially and after a design or process change that affects the parameter.

CS Hold Time 1000 100 100 ns

3

Doc No. 25069-00 6/99 SPI-1

CAT25C64/128

FUNCTIONAL DESCRIPTION

CSCS

CS: Chip Select

CSCS

Advance Information

The CAT25C64/128 supports the SPI bus data trans­mission protocol. The synchronous Serial Peripheral
Interface (SPI) helps the CAT25C64/128 to interface
directly with many of today’s popular microcontrollers.
The CAT25C64/128 contains an 8-bit instruction regis­ter. (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.

PIN DESCRIPTION

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
25C64/128. 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 25C64/128. 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 synchro­nize the communication between the microcontroller
and the 25C64/128. 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 is the Chip select pin. CS low enables the CAT25C64/
128 and CS high disables the CAT25C64/128. CS high
takes the SO output pin to high impedance and forces
the devices into a Standby Mode (unless an internal
write operation is underway). The CAT25C64/128 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.

WPWP

WP: Write Protect

WPWP
WP is the Write Protect pin. The Write Protect pin will

allow normal read/write operations when held high.
When 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.

HOLDHOLD

HOLD: Hold

HOLDHOLD

The HOLD pin is used to pause transmission to the
CAT25C64/128 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 communication, 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 sequence.

INSTRUCTION SET

Instruction Opcode Operation

WREN 0000 0110 Enable Write Operations
WRDI 0000 0100 Disable Write Operations
RDSR 0000 0101 Read Status Register
WRSR 0000 0001 Write Status Register
READ 0000 0011 Read Data from Memory
WRITE 0000 0010 Write Data to Memory

Doc. No. 25069-00 6/99 SPI-1

4

Advance Information

CAT25C64/128

STATUS REGISTER

The Status Register indicates the status of the device.

array. These bits are non-volatile.
The WPEN (Write Protect Enable) is an enable bit for the

WP pin. The WP pin and WPEN bit in the status register

The RDY (Ready) bit indicates whether the CAT25C64/
128 is busy with a write operation. When set to 1 a write
cycle is in progress and when set to 0 the device
indicates it is ready. This bit is read only.

The WEL (Write Enable) bit indicates the status of the
write enable latch . When set to 1, the device is in a Write
Enable state and when set to 0 the device is in a Write
Disable state. The WEL bit can only be set by the WREN
instruction and can be reset by the WRDI instruction.

control the programmable hardware write protect fea­ture. Hardware write protection is enabled when WP is
low and WPEN bit is set to high. The user cannot write
to the status register (including the block protect bits and
the WPEN bit) and the block protected sections in the
memory array when the chip is hardware write pro­tected. Only the sections of the memory array that are
not block protected can be written. Hardware write
protection is disabled when either WP pin is high or the
WPEN bit is zero.

The BP0 and BP1 (Block Protect) bits indicate which
blocks are currently protected. These bits are set by the
user issuing the WRSR instruction. The user is allowed
to protect quarter of the memory, half of the memory or
the entire memory by setting these bits. Once protected
the user may only read from the protected portion of the

STATUS REGISTER

76543210

WPEN X X X BP1 BP0 WEL RDY

BLOCK PROTECTION BITS

Status Register Bits Array Address Protection

BP1 BP0 Protected

0 0 None No Protection
0 1 25C128: 3000-3FFF Quarter Array Protection

25C64:1800-1FFF

1 0 25C128: 2000-3FFF Half Array Protection

25C64:1000-1FFF

1 1 25C128: 0000-3FFF Full Array Protection

25C64:1000-1FFF

WRITE PROTECT ENABLE OPERATION

Protected Unprotected Status

WPEN

WPWP

WP WEL Blocks Blocks Register

WPWP

0 X 0 Protected Protected Protected
0 X 1 Protected Writable Writable
1 Low 0 Protected Protected Protected

1 Low 1 Protected Writable Protected
X High 0 Protected Protected Protected
X High 1 Protected Writable Writable

5

Doc No. 25069-00 6/99 SPI-1

CAT25C64/128

Advance Information

DEVICE OPERATION

Write Enable and Disable

The CAT25C64/128 contains a write enable latch. This
latch must be set before any write operation. The device
powers up in a write disable state when Vcc is applied.
WREN instruction will enable writes (set the latch) to the
device. WRDI instruction will disable writes (reset the
latch) to the device. Disabling writes will protect the
device against inadvertent writes.

READ Sequence

The part is selected by pulling CS low. The 8-bit read
instruction is transmitted to the CAT25C64/128, fol­lowed by the 16-bit address(the three Most Significant
Bits are don’t care for 25C64 and two most significant
bits are don't care for 25C128).

Figure 2.WREN Instruction Timing

CS

SK

After the correct read instruction and address are sent,
the data stored in the memory at the selected address is
shifted out on the SO pin. The data stored in the memory
at the next address can be read sequentially by continu­ing to provide clock pulses. The internal address pointer
is automatically incremented to the next higher address
after each byte of data is shifted out. When the highest
address (1FFFh for 25C64 and 3FFFh for 25C128) is
reached, the address counter rolls over to 0000h allow­ing the read cycle to be continued indefinitely. The read
operation is terminated by pulling the CS high. To read
the status register, RDSR instruction should be sent.
The contents of the status register are shifted out on the
SO line. The status register may be read at any time
even during a write cycle. Read sequece is illustrated in
Figure 4. Reading status register is illustrated in Figure 5.

SI

SO

Figure 3.WRDI Instruction Timing

CS

SK

SI

SO

00000

HIGH IMPEDANCE

00000

HIGH IMPEDANCE

110

100

Doc. No. 25069-00 6/99 SPI-1

6

Advance Information

CAT25C64/128

WRITE Sequence

The CAT25C64/128 powers up in a Write Disable state.
Prior to any write instructions, the WREN instruction
must be sent to CAT25C64/128. The device goes into
Write enable state by pulling the CS low and then
clocking the WREN instruction into CAT25C64/128. The
CS must be brought high after the WREN instruction to
enable writes to the device. If the write operation is
initiated immediately after the WREN instruction without
CS being brought high, the data will not be written to the
array because the write enable latch will not have been
properly set. Also, for a successful write operation the
address of the memory location(s) to be programmed
must be outside the protected address field location
selected by the block protection level.

Figure 4.Read Instruction Timing

CS

0123456789102021222324252627282930

SK

Byte Write

Once the device is in a Write Enable state, the user may
proceed with a write sequence by setting the CS low,
issuing a write instruction via the SI line, followed by the
16-bit address (the three Most Significant Bits are don’t
care for 25C64 and two most significant bits are don't
care for 25C128), and then the data to be written.
Programming will start after the CS is brought high.
Figure 6 illustrates byte write sequence.

OPCODE

SI

SO

00000011

HIGH IMPEDANCE

*Please check the instruction set table for address

Figure 5.RDSR Instruction Timing

CS

012345678 10911121314

SCK

OPCODE

SI

SO

00

00 101

0

HIGH IMPEDANCE

BYTE ADDRESS*

MSB

7 6

DATA OUT

7 6 5 4 3 2 1 0

MSB

DATA OUT

5

4 3 2 1 0

7

Doc No. 25069-00 6/99 SPI-1

CAT25C64/128

Advance Information

During an internal write cycle, all commands will be
ignored except the RDSR (Read Status Register) in­struction.

The Status Register can be read to determine if the write
cycle is still in progress. If Bit 0 of the Status Register is
set at 1, write cycle is in progress. If Bit 0 is set at 0, the
device is ready for the next instruction.

Page Write

The CAT25C64/128 features page write capability. Afer
the first initial byte the host may continue to write up to
64 bytes of data to the CAT25C64/128. After each byte
of data is received, six lower order address bits are
internally incremented by one; the high order bits of
address will remain constant. The only

Figure 6.Write Instruction Timing

CS

012345678 2122232425262728293031

SK

restriction is that the 64 bytes must reside on the same
page. If the address counter reaches the end of the
page and clock continues, the counter will “roll over” to
the first address of the page and overwrite any data that
may have been written. The CAT25C64/128 is auto­matically returned to the write disable state at the comple­tion of the write cycle. Figure 8 illustrates the page write
sequence.

To write to the status register, the WRSR instruction
should be sent. Only Bit 2, Bit 3 and Bit 7 of the status
register can be written using the WRSR instruction.
Figure 7 illustrates the sequence of writing to status
register.

OPCODE

SI

SO

0 0 0 0 0 0 1 0 ADDRESS

HIGH IMPEDANCE

Figure 7.WRSR Instruction Timing

CS

012345678 10911121314

SCK

OPCODE

SI

SO

00

00001

0

HIGH IMPEDANCE

DATA IN

D7D6D5 D4 D3 D2 D1 D0

DATA IN

7 6

MSB

4 3 2 10

5

15

Doc. No. 25069-00 6/99 SPI-1

8

Advance Information

DESIGN CONSIDERATIONS

The CAT25C64/128 powers up in a write disable state
and in a low power standby mode. A WREN instruction
must be issued to perform any writes to the device after
power up. Also,on power up CS should be brought low
to enter a ready state and receive an instruction. After
a successful byte/page write or status register write the

Figure 8.Page Write Instruction Timing

CS

CAT25C64/128

CAT25C64/128 goes into a write disable mode. CS
must be set high after the proper number of clock cycles
to start an internal write cycle. Access to the array
during an internal write cycle is ignored and program­ming is continued. On power up, SO is in a high
impedance.

SK

SI

SO

Figure 9.

CS

SCK

HOLD

SO

012345678 212223

OPCODE

0 0 0 0 0 0 1 0 ADDRESS

HIGH IMPEDANCE

HOLDHOLD

HOLD Timing

HOLDHOLD

t

CD

t

HD

t

HZ

32-39

24-31

Data

Data

Byte 1

Byte 2

t

HD

HIGH IMPEDANCE

24+(N-1)x8-1..24+(N-1)x824+Nx8-1

DATA IN

Data
Byte 3

t

CD

t

LZ

Data Byte N

7..1

0

ORDERING INFORMATION

Prefix Device # Suffix

CAT

Optional
Company ID

25C64

Product
Number

25C64: 64K
25C128: 128K

Package

P = PDIP
S = 8-Pin SOIC
S16 = 16-Pin SOIC

S

I

Temperature Range

Blank = Commercial (0˚C to +70˚C)
I = Industrial (-40˚C to +85˚C)
A = Automotive (-40˚ to +105˚C)*

Operating Voltage

Blank = 2.5 to 6.0V

1.8 = 1.8 to 6.0V

U20 = 20-Pin TSSOP

* -40˚C to +125˚C is available upon request

Notes:
(1)The device used in the above example is a 25C64SI-1.8TE13 (SOIC, Industrial Temperature, 1.8 Volt to 6 Volt Operating Voltage,

Tape & Reel)

9

-1.8

TE13

Tape & Reel

TE13: 2000/Reel

Doc No. 25069-00 6/99 SPI-1