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PDF AT28C64B Data sheet ( Hoja de datos )
| Número de pieza | AT28C64B | |
| Descripción | 64K (8K x 8) Parallel EEPROM | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Fast Read Access Time – 150 ns
• Automatic Page Write Operation
– Internal Address and Data Latches for 64 Bytes
• Fast Write Cycle Times
– Page Write Cycle Time: 10 ms Maximum (Standard)
2 ms Maximum (Option – Ref. AT28HC64BF Datasheet)
– 1 to 64-byte Page Write Operation
• Low Power Dissipation
– 40 mA Active Current
– 100 µA CMOS Standby Current
• Hardware and Software Data Protection
• DATA Polling and Toggle Bit for End of Write Detection
• High Reliability CMOS Technology
– Endurance: 100,000 Cycles
– Data Retention: 10 Years
• Single 5V ±10% Supply
• CMOS and TTL Compatible Inputs and Outputs
• JEDEC Approved Byte-wide Pinout
• Industrial Temperature Ranges
• Green (Pb/Halide-free) Packaging Option Only
1. Description
The AT28C64B is a high-performance electrically-erasable and programmable read-
only memory (EEPROM). Its 64K of memory is organized as 8,192 words by 8 bits.
Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 150 ns with power dissipation of just 220 mW. When the device is
deselected, the CMOS standby current is less than 100 µA.
The AT28C64B is accessed like a Static RAM for the read or write cycle without the
need for external components. The device contains a 64-byte page register to allow
writing of up to 64 bytes simultaneously. During a write cycle, the addresses and 1 to
64 bytes of data are internally latched, freeing the address and data bus for other
operations. Following the initiation of a write cycle, the device will automatically write
the latched data using an internal control timer. The end of a write cycle can be
detected by DATA POLLING of I/O7. Once the end of a write cycle has been
detected, a new access for a read or write can begin.
Atmel’s AT28C64B has additional features to ensure high quality and manufacturabil-
ity. The device utilizes internal error correction for extended endurance and improved
data retention characteristics. An optional software data protection mechanism is
available to guard against inadvertent writes. The device also includes an extra
64 bytes of EEPROM for device identification or tracking.
64K (8K x 8)
Parallel
EEPROM with
Page Write and
Software Data
Protection
AT28C64B
0270L–PEEPR–2/09
1 page  
5. DC and AC Operating Range
Operating Temperature (Case)
VCC Power Supply
AT28C64B-15
-40°C - 85°C
5V ±10%
AT28C64B
6. Operating Modes
Mode
CE
Read
Write(2)
Standby/Write Inhibit
Write Inhibit
VIL
VIL
VIH
X
Write Inhibit
X
Output Disable
X
Chip Erase
Notes: 1. X can be VIL or VIH.
2. See “AC Write Waveforms” on page 8.
3. VH = 12.0V ±0.5V.
VIL
7. Absolute Maximum Ratings*
Temperature Under Bias................................ -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
All Input Voltages
(including NC Pins)
with Respect to Ground ...................................-0.6V to +6.25V
All Output Voltages
with Respect to Ground .............................-0.6V to VCC + 0.6V
Voltage on OE and A9
with Respect to Ground ...................................-0.6V to +13.5V
OE
VIL
VIH
X(1)
X
VIL
VIH
VH(3)
WE I/O
VIH DOUT
VIL DIN
X High Z
VIH
X
X High Z
VIL High Z
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect
device reliability
8. DC Characteristics
Symbol
ILI
ILO
ISB1
ISB2
ICC
VIL
VIH
VOL
VOH
Parameter
Input Load Current
Output Leakage Current
VCC Standby Current CMOS
VCC Standby Current TTL
VCC Active Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
0270L–PEEPR–2/09
Condition
VIN = 0V to VCC + 1V
VI/O = 0V to VCC
CE = VCC - 0.3V to VCC + 1V
CE = 2.0V to VCC + 1V
f = 5 MHz; IOUT = 0 mA
IOL = 2.1 mA
IOH = -400 µA
Min Max Units
10 µA
10 µA
100 µA
2 mA
40 mA
0.8 V
2.0 V
0.40 V
2.4 V
5
5 Page 
AT28C64B
22. Data Polling Characteristics(1)
Symbol Parameter
Min Typ Max
tDH
tOEH
tOE
tWR
Notes:
Data Hold Time
0
OE Hold Time
OE to Output Delay(1)
0
Write Recovery Time
0
1. These parameters are characterized and not 100% tested. See “AC Read Characteristics” on page 6.
23. Data Polling Waveforms
Units
ns
ns
ns
ns
tOEH
tDH
tOE
24. Toggle Bit Characteristics(1)
Symbol Parameter
tDH
tOEH
tOE
tOEHP
tWR
Notes:
Data Hold Time
OE Hold Time
OE to Output Delay(2)
OE High Pulse
Write Recovery Time
1. These parameters are characterized and not 100% tested.
2. See “AC Read Characteristics” on page 6.
25. Toggle Bit Waveforms(1)(2)(3)
tWR
Min Typ Max Units
10 ns
10 ns
ns
150 ns
0 ns
tOEH
tDH
tOEHP
tOE
Notes:
1. Toggling either OE or CE or both OE and CE will operate toggle bit.
2. Beginning and ending state of I/O6 will vary.
3. Any address location may be used but the address should not vary.
0270L–PEEPR–2/09
tWR
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AT28C64B.PDF ] | |
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