Advanced Information
CAT25C32/64
32K/64K-Bit SPI Serial CMOS E
2
PROM
FEATURES
s
10 MHz SPI Compatible
s
1.8 to 6.0 Volt Operation
s
Hardware and Software Protection
s
Zero Standby Current
s
Low Power CMOS Technology
s
SPI Modes (0,0 &1,1)
s
Commercial, Industrial and Automotive
s
1,000,000 Program/Erase Cycles
s
100 Year Data Retention
s
Self-Timed Write Cycle
s
8-Pin DIP/SOIC, 16-Pin SOIC, 14-Pin TSSOPand
20-Pin TSSOP
s
64-Byte Page Write Buffer
s
Block Write Protection
Temperature Ranges
– Protect 1/4, 1/2 or all of E
2
PROM Array
DESCRIPTION
The CAT25C32/64 is a 32K/64K-Bit SPI Serial CMOS
E
2
PROM internally organized as 4Kx8/8Kx8 bits.
Catalyst’s advanced CMOS Technology substantially
reduces device power requirements. The CAT25C32/
64 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
required to access the device. The
HOLD
pin may be
used to suspend any serial communication without
resetting the serial sequence. The CAT25C32/64 is
designed with software and hardware write protection
features including Block write protection. The device is
available in 8-pin DIP, 8-pin SOIC, 14-pin TSSOP and
20-pin TSSOP packages.
PIN CONFIGURATION
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
NC
NC
NC
WP
V
SS
BLOCK DIAGRAM
14
13
12
11
10
9
8
VCC
HOLD
NC
NC
NC
SCK
SI
SOIC Package (S) TSSOP Package (U14) TSSOP Package (U20)
1
2
3
4
5
6
7
NC
CS
SO
SO
NC
NC
WP
V
SS
NC
NC
DIP Package (P)
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
VCC
HOLD
HOLD
NC
NC
SCK
SI
NC
SO
NC
SI
CS
WP
HOLD
SCK
SENSE AMPS
SHIFT REGISTERS
WORD ADDRESS
BUFFERS
COLUMN
DECODERS
I/O
CONTROL
SPI
CONTROL
LOGIC
BLOCK
PROTECT
LOGIC
CONTROL LOGIC
XDEC
E
2
PROM
ARRAY
PIN FUNCTIONS
Pin Name
SO
SCK
WP
V
CC
V
SS
CS
SI
HOLD
NC
Function
Serial Data Output
Serial Clock
Write Protect
+1.8V to +6.0V Power Supply
Ground
Chip Select
Serial Data Input
Suspends Serial Input
No Connect
DATA IN
STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATUS
REGISTER
© 1999 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc No. 25087-00 8/99 SPI-1
CAT25C32/64
Advanced 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 V
SS1)
................... –2.0V to +V
CC
+2.0V
V
CC
with Respect to V
SS ................................
–2.0V to +7.0V
Package Power Dissipation
Capability (Ta = 25°C) ................................... 1.0W
Lead Soldering Temperature (10 secs) ............ 300°C
Output Short Circuit Current
(2)
........................ 100 mA
RELIABILITY CHARACTERISTICS
Symbol
N
END(3)
T
DR(3)
V
ZAP(3)
I
LTH(3)(4)
Parameter
Endurance
Data Retention
ESD Susceptibility
Latch-Up
Min.
1,000,000
100
2000
100
Max.
*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 specifica-
tion is not implied. Exposure to any absolute maximum
rating for extended periods may affect device perfor-
mance and reliability.
Units
Cycles/Byte
Years
Volts
mA
Reference Test Method
MIL-STD-883, Test Method 1033
MIL-STD-883, Test Method 1008
MIL-STD-883, Test Method 3015
JEDEC Standard 17
D.C. OPERATING CHARACTERISTICS
V
CC
= +1.8V to +6.0V, unless otherwise specified.
Limits
Symbol
I
CC1
I
CC2
I
SB
I
LI
I
LO
V
IL(3)
V
IH(3)
V
OL1
V
OH1
V
OL2
V
OH2
Parameter
Power Supply Current
(Operating Write)
Power Supply Current
(Operating Read)
Power Supply Current
(Standby)
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
Output Low Voltage
Output High Voltage
V
CC
-0.2
V
CC
- 0.8
0.2
-1
V
CC
x 0.7
Min.
Typ.
Max.
10
2
0
2
3
V
CC
x 0.3
V
CC
+ 0.5
0.4
Units
mA
mA
µA
µA
µA
V
V
V
V
V
V
4.5V≤V
CC
<5.5V
I
OL
= 3.0mA
I
OH
= -1.6mA
1.8V≤V
CC
<2.7V
I
OL
= 150µA
I
OH
= -100µA
V
OUT
= 0V to V
CC
,
CS = 0V
Test Conditions
V
CC
= 5V @ 10MHz
SO=open; CS=Vss
V
CC
= 5.0V
F
CLK
= 10MHz
CS
= V
CC
V
IN
= V
SS
or V
CC
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 V
CC
+0.5V, which may overshoot to V
CC
+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 V
CC
+1V.
Doc. No. 25087-00 8/99 SPI-1
2
Advanced Information
Figure 1. Sychronous Data Timing
V
IH
CAT25C32/64
t
CS
CS
V
IL
t
CSS
V
IH
t
CSH
SCK
V
IL
t
SU
V
IH
t
WH
t
H
t
WL
SI
VIL
VALID IN
t
RI
tFI
t
V
V
OH
t
HO
t
DIS
HI-Z
SO
V
OL
HI-Z
Note: Dashed Line= mode (1, 1) — — — —
A.C. CHARACTERISTICS
Limits
Vcc=
1.8V-6.0V
SYMBOL PARAMETER
t
SU
t
H
t
WH
t
WL
f
SCK
t
LZ
t
RI(1)
t
FI(1)
t
HD
t
CD
t
WC
t
V
t
HO
t
DIS
t
HZ
t
CS
t
CSS
t
CSH
Data Setup Time
Data Hold Time
SCK High Time
SCK Low Time
Clock Frequency
HOLD
to Output Low Z
Input Rise Time
Input Fall Time
HOLD
Setup Time
HOLD
Hold Time
Write Cycle Time
Output Valid from Clock Low
Output Hold Time
Output Disable Time
HOLD
to Output High Z
CS
High Time
CS
Setup Time
CS
Hold Time
500
500
500
0
250
150
250
250
250
100
100
10
250
0
250
100
200
100
100
Min.
50
50
250
250
DC
1
50
2
2
100
100
10
250
0
75
50
Max.
V
CC
=
2.5V-6.0V
Min.
50
50
125
125
DC
3
50
2
2
40
40
5
80
Max.
V
CC
=
4.5V-5.5V
Min.
20
20
40
40
DC
10
50
2
2
Max.
ns
ns
ns
ns
MHz
ns
µs
µs
ns
ns
ms
ns
ns
ns
ns
ns
ns
ns
C
L
= 50pF
Test
UNITS Conditions
NOTE:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
3
Doc No. 25087 -00 8/99 SPI-1
CAT25C32/64
Advanced Information
CS
Chip Select
CS:
CS
is the Chip select pin.
CS
low enables the CAT25C32/
64 and
CS
high disables the CAT25C32/64.
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 CAT25C32/64 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:
WP
Write Protect
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.
HOLD:
HOLD
Hold
The
HOLD
pin is used to pause transmission to the
CAT25C32/64 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 V
cc
or tied to V
cc
through a resistor.
Figure 9 illustrates hold timing sequence.
FUNCTIONAL DESCRIPTION
The CAT25C32/64 supports the SPI bus data transmis-
sion protocol. The synchronous Serial Peripheral Inter-
face (SPI) helps the CAT25C32/64 to interface directly
with many of today’s popular microcontrollers. The
CAT25C32/64 contains an 8-bit instruction register.
(The instruction set and the operation codes are de-
tailed 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
25C32/64. 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 25C32/64. 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 25C32/64. 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.
INSTRUCTION SET
Instruction
WREN
WRDI
RDSR
WRSR
READ
WRITE
Opcode
0000 0110
0000 0100
0000 0101
0000 0001
0000 0011
0000 0010
Operation
Enable Write Operations
Disable Write Operations
Read Status Register
Write Status Register
Read Data from Memory
Write Data to Memory
Doc. No. 25087-00 8/99 SPI-1
4
Advanced Information
CAT25C32/64
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
control the programmable hardware write protect fea-
ture. 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 pro-
tected. 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.
STATUS REGISTER
The Status Register indicates the status of the device.
The
RDY
(Ready) bit indicates whether the CAT25C32/
64 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.
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
7
WPEN
6
X
5
X
4
X
3
BP1
2
BP0
1
WEL
0
RDY
BLOCK PROTECTION BITS
Status Register Bits
BP1
BP0
0
0
1
1
0
1
0
1
Array Address
Protected
None
25C32: 0C00-0FFF
25C64:1800-1FFF
25C32: 800-0FFF
25C64:1000-1FFF
25C32: 0000-0FFF
25C64:0000-1FFF
Protection
No Protection
Quarter Array Protection
Half Array Protection
Full Array Protection
WRITE PROTECT ENABLE OPERATION
Protected
Blocks
Protected
Protected
Protected
Protected
Protected
Protected
Unprotected
Blocks
Protected
Writable
Protected
Writable
Protected
Writable
Status
Register
Protected
Writable
Protected
Protected
Protected
Writable
WPEN
0
0
1
1
X
X
WP
X
X
Low
Low
High
High
WEL
0
1
0
1
0
1
5
Doc No. 25087 -00 8/99 SPI-1
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