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PDF ( 数据手册 , 数据表 ) 28C512

零件编号 28C512
描述 CAT28C512
制造商 ON Semiconductor
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28C512 数据手册, 描述, 功能
CAT28C512/513
512K-Bit CMOS PARALLEL EEPROM
FEATURES
s Fast Read Access Times: 120/150 ns
s Low Power CMOS Dissipation:
–Active: 50 mA Max.
–Standby: 200 µA Max.
s Simple Write Operation:
–On-Chip Address and Data Latches
–Self-Timed Write Cycle with Auto-Clear
s Fast Write Cycle Time:
–5ms Max
s CMOS and TTL Compatible I/O
DESCRIPTION
The CAT28C512/513 is a fast,low power, 5V-only CMOS
parallel EEPROM organized as 64K x 8-bits. It requires
a simple interface for in-system programming. On-chip
address and data latches, self-timed write cycle with
auto-clear and VCC power up/down write protection
eliminate additional timing and protection hardware.
DATA Polling and Toggle status bits signal the start and
end of the self-timed write cycle. Additionally, the
CAT28C512/513 features hardware and software write
protection.
BLOCK DIAGRAM
s Automatic Page Write Operation:
–1 to 128 Bytes in 5ms
–Page Load Timer
s End of Write Detection:
–Toggle Bit
DATA Polling
s Hardware and Software Write Protection
s 100,000 Program/Erase Cycles
s 100 Year Data Retention
s Commercial, Industrial and Automotive
Temperature Ranges
The CAT28C512/513 is manufactured using Catalyst’s
advanced CMOS floating gate technology. It is designed
to endure 100,000 program/erase cycles and has a data
retention of 100 years. The device is available in JEDEC
approved 32-pin DIP, PLCC and TSOP packages.
A7A15
VCC
CE
OE
WE
A0A6
ADDR. BUFFER
& LATCHES
INADVERTENT
WRITE
PROTECTION
CONTROL
TIMER
ADDR. BUFFER
& LATCHES
ROW
DECODER
HIGH VOLTAGE
GENERATOR
DATA POLLING
AND
TOGGLE BIT
COLUMN
DECODER
65,536 x 8
EEPROM
ARRAY
128 BYTE PAGE
REGISTER
I/O BUFFERS
I/O0I/O7
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-1007, Rev. I







28C512 pdf, 数据表
CAT28C512/513
DATA Polling
DATA polling is provided to indicate the completion of
write cycle. Once a byte write or page write cycle is
initiated, attempting to read the last byte written will
output the complement of that data on I/O7 (I/O0I/O6
are indeterminate) until the programming cycle is com-
plete. Upon completion of the self-timed write cycle, all
I/Os will output true data during a read cycle.
Toggle Bit
In addition to the DATA Polling feature of the CAT28C512/
513, the device offers an additional method for determin-
ing the completion of a write cycle. While a write cycle is
in progress, reading data from the device will result in I/
O6 toggling between one and zero. However, once the
write is complete, I/O6 stops toggling and valid data can
be read from the device.
Figure 7. DATA Polling
ADDRESS
CE
WE
tOEH
tOE
OE
tOES
tWC
I/O7
DIN = X
DOUT = X
D OUT = X
Figure 8. Toggle Bit
WE
CE
OE
I/O6
tOEH
tOE
(1)
tOES
tWC
(1)
Note:
(1) Beginning and ending state of I/O6 is indeterminate.
Doc. No. MD-1007, Rev. I
8
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice














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